We have a large mass thus our associated wavelength is small for humans.
What is the DeBroglie Wavelength?We know that the wavelength has to do with the distance that is covered by a wave. This would normally refers to the horizontal distance. According to the wave particle duality theory that was put forward by the man Louis DeBroglie, he said that when matter is in motion, it must have an associated wavelength.
We know from the theory that;
λ = h/p
λ = wavelength of the object
h = Plank's constant
p = momentum of the objects.
We have to note that the momentum is the product of the mass and the velocity of the object.
We now know that as the mass of the object increases, the velocity becomes infinitesimal and may not be felt.
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circle all of the species below that can form a hydrogen bond in its pure form. explain why the other species couldn't hydrogen bond
Since I2 was larger with more electrons, it has greater forces than N2, that is also nonpolar and only has London dispersion forces.
What is hydrogen used for?
Fuel cells may produce energy, power, and heat using hydrogen. The two industries where hydrogen is currently most widely employed are fertilizer manufacturing and petroleum refining, with the developing markets of utilities and transportation.
Can you drink hydrogen water?
Experts disagree whether consuming hydrogen water has any hazards. However, they were unsure if its advantages outweigh those of drinking regular water or being hydrated in general. Hypovolemia, which can be fatal, can result from excessive water intake.
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questions: will the arsenic in well b-1 likely contaminate the water in clearwater lake? why or why not? in which direction is the contaminated water in well b-1 moving? which well will most likely show contamination of arsenic next?
Water desk elevation is the upper or below surface of the groundwater, when the soil or underlying rock material is wholly saturated with water. The water table can be contamination of ground water by hazarodus wastes, fertilisers, pesticides, acid rain etc
How can a element contaminate water table?
The water desk elevation of the Clearwater lake isn't always given. Assuming, the water desk elevation of B1 is 171ft. We recognize the idea that water flows from higher elevation to lower elevation. So the wells having elevation much less than 171 feet gets infected via way of means of B1 contaminants, however the ones are having better elevation that 171ft will no longer get infected.
And approximately the route of infected water, the infected water will float closer to the course in the Wells of decrease elevation than 171ft.
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to what volume should you dilute 25ml of a 10m sulfuric acid solution to obtain a .150 m sulfuric acid solution
Solvent volume is 1642 ml. you create a.150 m sulfuric acid solutions by diluting 25 ml of a 10 m sulfuric acid solution.
Sulfuric acid: What is it?Oily liquid sulfuric acid is colorless. With the discharge of heat, it dissolves in water. It corrodes flesh and metals. On contact, it will scorch wood and the majority of other organic materials, although it is unlikely to start a fire.
What will happen if you get sulfuric acid on you?Sulfuric acid exposure can happen through consumption, skin contact, physical contact, breathing polluted air, and ingestion. Sulfuric acid can irritate the mouth and throat, burn your eyes, burn a hole in the gut if eaten, cause serious skin burns, and make breathing difficult if inhaled.
Briefing:Since this is a dilution question the equation to use is; C1V1=C2V2
C₁ = Initial concentration =10M
V₁ = Initial volume = 25ml
C₂ = Final concentration = 0.150M
V₂ = Final volume = ?
V₂ = C₁V₁/C₂
V₂ = 10.0M * 25 ml / 0.150m
V₂ = 1667 ml
Volume of solvent = 1667 - 25
=1642ml
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choose the aqueous solution with the lowest vapor pressure. these are all solutions of nonvolatile solutes and you should assume ideal van't hoff factors where applicable.
highest product of vant hoff factor and molality will give most lower in vapor pressure
because it depends directly on both
d option is true
vant hoff factor=3 (3ions)
3*0.06=0.18 will be highest so it is true
A substance that does not readily evaporate is referred to as a nonvolatile solute. Additionally, it does not increase the vapor pressure of the solution when dissolved in a solvent. What exactly is a nonvolatile liquid then? High melting points and low vapor pressure are characteristics of nonvolatile liquids.
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Calculate the standard reaction entropy for the decomposition of 1 mol calcite to carbon dioxide gas and solid calcium oxide at 25°c.
Entropy change is typically 160.6 J/K.
ΔH°reaction=∑ΔH°f(reactants)+∑ΔH°f(reactants)
What does a typical entropy mean?The entropy content of one mole of a pure substance at a standard condition of pressure and any desired temperature is known as the standard molar entropy in chemistry. These are frequently (but not always) used as the typical temperature and pressure.
How is the entropy of a reaction calculated?Take an energy reading at a given temperature to calculate entropy. To quantify thermal energy transmitted (q) at a particular temperature, a calorimeter is typically used. Maintain the temperature value mathematically constant by assuming only extremely slight variations in the process's conditions.
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Nuclear decay occurs according to first-order kinetics. Scandium-43 decays with a rate constant of 0. 178 days–1. After 15. 0 days, a sample has a mass of 1. 73 g. What was the original mass of the sample?.
According to the claim that nuclear decay follows first-order kinetics, the sample's original mass is 25.0 g.
Describe nuclear energy.The force found in a protons and neutrons, or core, is referred to as nuclear energy. All everything in the cosmos is made up of microscopic building blocks called atoms, and the nucleus is held together by energy.
What occurs in the event of a nuclear power station bombing?An enormous quantity of radioactive material might be spilled into the atmosphere in the event of a nuclear facility meltdown or explosion. If there had been an explosion, everyone inside the nuclear site would likely be poisoned and potentially hurt.
Briefing:
Expression for rate law for first order kinetics is given by:
t = 2.303/k * log(a/(a - x))
where,
k = rate constant = 0.178 days^-1
t = time passed by the sample = 15days
a = original or initial amount of the reactant
a - x = amount left after decay process = 1.73g
Now put all the given values in above equation, we get
15=(2.303/0.178) * log (a/1.73)
log (a/1.73) = 15 * 0.178/2.303
a/1.73 = 10^( 15*0.178/2.303)
a = 1.73 * 10^( 2670/2303)
a = 1.73 * 10^(1.15935736)
a = 1.73 * 14.433024871
a = 24.9691330268
Therefore, a is approximately 25 grams .
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the bond angle marked a in the following molecule is about . question 24 options: a) 109.5 b) 180 c) 60 d) 120 e) 90
The bond angle marked a in the following molecule is about 120. The atomic configuration of a molecule in three dimensions is known as molecular geometry.
Bond lengths, bond angles, torsional angles, and any other geometrical factors that affect each atom's position are all included in this, along with the molecule's overall form. In a complex molecule or ion, the angle between two orbitals that contain bonding electron pairs, or bonds, that are arranged around the centre atom is referred to as the bond angle.
A molecule is a collection of two or more atoms bonded together by the attractive forces known as chemical bonds; depending on the context, this definition may or may not contain ions. The number of atoms that make up a molecule might vary. If there are multiple atoms, they may all be the same atom or they may all be different.
the complete question is:
The bond angle marked a in the following molecule (H4C2O2N) is about.
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a chemist measures the amount of mercury in sediment samples from three areas of a river (the source, the midway point, and the mouth). which is the most reasonable hypothesis for the chemist's experiment?
A chemist counts the quantity of mercury present in sediment samples collected from three different riverbanks (the source, the midway point, and the mouth).
Who is known as a chemist?A scientist who has received training inside the study of chemistry is known as a chemist (from the Greek chm(a) alchemist; replacing chymist from Latin “ alchemist). Chemists look into the composition and characteristics of stuff.
Is a pharmacist a chemist?A pharmacist is a medical professional who helps prepare, controls, formulates, preserves, distributes, and advises and guides the general public on the proper use of medications to achieve maximum results. They are also referred to as chemists (Commonwealth English), druggists (North American, and, archaically, Commonwealth English) and chemists (Commonwealth English).
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the exchange capacity of an ion-exchange resin is defined as the number of moles of charged sites per gram of dry resin. describe how you would measure the exchange capacity of an anion-exchange resin by using standard naoh, standard hcl, or any other reagent you wish.
The exchange capacity of an anion-exchange resin can be measured using a titration method. First, a known weight of the resin is weighed out and suspended in a buffered solution of a known pH.
The resin is then titrated with a standard solution of either sodium hydroxide (NaOH) or hydrochloric acid (HCl) until the pH of the solution reaches a predetermined endpoint. The amount of titrant added during the titration is then used to calculate the moles of charged sites per gram of dry resin.
To calculate the exchange capacity, the following equation can be used:
Exchange Capacity (mol/g dry resin) = (mol titrant added) / (g dry resin)
The mol titrant added is determined from the titration curve, which is constructed by measuring the pH of the solution versus the volume of titrant added. The endpoint of the titration is typically assumed when the pH of the solution reaches a predetermined value.
To ensure accuracy, the titration should be repeated at least three times and the average of the results should be taken. This will ensure that the exchange capacity measured is an accurate representation of the resin.
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identify the oxidized substance, the reduced substance, the oxidizing agent, and the reducing agent in the redox reaction. cu(s) 2agno3(aq)⟶2ag(s) cu(no3)2(aq) which substance gets oxidized? ag ag no−3 cu2 cu which substance gets reduced? ag no−3 cu2 cu ag what is the oxidizing agent? no−3 cu ag ag cu2 what is the reducing agent? no−3 cu2 ag cu ag
The given redox reaction, Cu(s)+2AgNO3(aq)⟶2Ag(s)+Cu(NO3)2(aq).
The substance gets oxidized = Cu The substance gets reduced = Ag + The oxidizing agent = Ag + The reducing a cu Ag
Reason:
Redox is a type of chemical reaction in which the oxidation states of the substrate change. Oxidation is the loss of electrons or an increase in the oxidation state, while reduction is the gain of electrons or a decrease in the oxidation state.
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a sample of gas at is collected above water. the atmospheric pressure that day istorr. what is the partial pressure of the dry gas in mmhg?
The partial pressure of the dry gas is 739.3 mmhg.
Dalton's law of partial pressure states that the total pressure equals to the sum of partial pressure of individual gases
PTotal = PH2 + PWater
Hence it is common that the pressure of hydrogen gas is less because we have also account pressure due to vapor pressure of water. In some cases we will also include partial pressure correction term, so that
PTotal = PH2 + PWater becomes
PTotal = PH2 + PWater + Pcorrection
At 21 ^0C water vapor pressure = 18.7 torr
PTotal = PH2 + PWater
758 torr = PH2 + 18.7 torr
PH2 = 758 - 18.7 = 739.3 torr
PH2 = 739.3 mmhg
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Which gas law can be used to calculate the pressure of hydrogen gas collected over water.
The overall pressure inside the container must equal the amount of the pressure of the gas we collected as well as the water vapor, according to Dalton's Law of Partial Pressures.
What is hydrogen gas?Hydrogen, a clean fuel, can replace methane, generally known as natural gas. It is expected to make up around 75% of the known universe mass and is the most common chemical element. Hydrogen atoms are abundant in waters, plants, animals, including, of course, human beings on this planet. The letters H and atomic number 1 stand for the chemical element hydrogen. Hydrogen is the lightest element. Hydrogen is typically a gas with the formula H2 composed of diatomic molecules. It is extremely flammable, non-toxic, tasteless, colorless, and odorless.
How is hydrogen gas made and its uses?High-Temperature Water Splitting: Chemical reactions that split water into hydrogen are fueled by high temperatures produced by solar concentrators or nuclear reactors. Photobiological Water Splitting: When water is consumed by microbes like green algae in the presence of sunshine, hydrogen is produced as a byproduct.
Fuel cells may produce energy, power, and heat using hydrogen. The two industries where hydrogen is currently most widely employed are fertilizer manufacturing and petroleum refining, with the developing markets of utilities and transportation.
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what volume (in ml) of water must you add to 50.0 ml of a 0.600 m libr solution to produce a 0.145 m solution? assume the volumes are additive.
The formula MaVa=MbVb is used in this dilution problem. The initial 50.00 mL solution needs to be diluted from 0.600 M to 0.145 M by the addition of 0.597 mL.
How to solve?The formula MaVa=MbVb is used
Ma=0.600M
Va=50.00ml
Mb=0.145M
Vb=(50.00+Xml)
MaVa=MbVb
(0.600)(50.00)=(0.145)(50.00+X)
30.00-0.145=(50.00+X)
29.85/50.00=X
X=0.597 ml
When a solution is diluted, which of the following remains constant?When a solution is diluted, which of the following remains constant? Dilution has no effect on the solute concentration in a solution. The moles of the solute do not change when a solvent is added to a solution, but the concentration of the solution (in molarity and in all other units) and its volume do.
How do you dilute a solution's concentration?Taking a solution of higher concentration and gradually adding water until the desired concentration is obtained is a typical technique for creating a solution of a specific concentration. This process is called dilution.
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According to the collision model, why does increasing the temperature increase the rate of a reaction?.
As temperature rises, more collisions with sufficient energy can take place, triggering the reaction due to increase in the kinetic energy. This concept is predicted by Collission theory. Collision theory helps scientists predict the rate of various chemical reactions. Collision theory helps scientists predict the rate of various chemical reactions. According to this theory, the number of successful collisions is related to the speed or rate of the chemical reaction
What is collision model?
The collision model states that a chemical reaction can only happen when reactant molecules, atoms, or ions meet with enough kinetic energy and in the right direction.
The main requirement for a collision model is that for a reaction to occur, the reactant particles (atoms or molecules) must collide and interact with each other in some way. This idea is used to explain many of the observations made about chemical kinetics.
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the formation of the crystalline nacl lattice from sodium blank and chloride blank is highly exothermic and more than compensates for the blank electron transfer process. since the sodium ions are blank charged and the chlorine ions are blank charged, the potential energy blank, as described by blank law, when these ions come together to form a lattice. that energy is blank as heat when the lattice forms. g
The formation of the crystalline NaCl lattice from sodium cations and chloride anions is highly exothermic and more than compensates for the endothermicity of the electron transfer process. In other words, the formation of ionic compounds isn't exothermic because sodium wants to lose electrons and chlorine wants to gain them; rather, it's exothermic because of the large amount of heat released when sodium and chlorine ions coalesce to form a crystal lattice.
To conduct nerve impulses, contract and relax muscles, and maintain the right ratio of water and minerals, the human body needs a modest quantity of sodium. For these essential processes, it is estimated that humans require 500 mg of sodium salt every day.
A nose, throat, and eyes might get irritated when exposed to low amounts of chlorine. At greater concentrations, breathing chlorine gas may alter respiratory patterns, cause coughing, and harm the lungs. Chlorine exposure might cause serious additional symptoms. Chlorine exposure may be harmful to workers.
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complete the following: ( note: formulas should be entered like the following example: potassium sulfate - k2so4 , another example: zinc nitrate - zn(no3)2 ) compound ionic or covalent formula sodium oxide covalent so iron(iii) bromide ionic febr3 sodium carbonate ionic na2co3 carbon tetrachloride covalent ccl4 nitrogen tribromide covalent nbr3
Compound Ionic or Covalent Formula
sodium oxide Ionic Na2O
iron(III) bromide Ionic FeBr3
sodium carbonate Ionic Na2CO3
carbon tetrachloride covalent CCl4
nitrogen tribromide covalent NBr3
Ionic bonds, which occur when two negatively charged ions join forces with positively charged ones, are formed when one atom transfers electrons to the other. Ionic bonds may be seen in the chemical compound sodium chloride.
A: The oxygen molecule is held together by two covalent bonds because the two oxygen atoms share two pairs of electrons. Two atoms, in this case oxygen and hydrogen, share electrons to form covalent bonds. Each end of the V-shaped H2O molecule assumes a slightly different charge as a result of the uneven attraction of oxygen and hydrogen to the shared electrons.
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Some cats have bobtails, which are short, stumpy tails that result from an inherited, recessive genotype (tt). Normal length tails are dominant in cats (tt, tt). When a cat with a bobtail is crossed with a cat that is heterozygous for normal tail length, what is the likelihood that the offspring will have a bobtail? 75% 50% 25% 0%.
When a cat with a bobtail (tt) is crossed with a cat that is heterozygous for normal tail length (Tt), the offspring will have the following genotypes: 50% will be Tt (normal tail length) and 50% will be tt (bobtail). This is because the heterozygous cat (Tt) carries one dominant allele (T) for normal tail length and one recessive allele (t) for bobtail. So, the likelihood that the offspring will have a bobtail is 50%. Therefore, the correct option is option 2.
Heterozygous refers to a genetic condition in which an individual carries two different alleles for a particular gene. Each gene in an organism typically has two alleles, one inherited from each parent. If an organism has two different alleles for a specific gene, it is considered heterozygous for that gene.
In this case, one allele is dominant and expresses its trait, while the other allele is recessive and remains hidden in the presence of the dominant allele. The term "heterozygous" contrasts with "homozygous," where an individual has two identical alleles for a particular gene.
Thus, the ideal selection is option 2.
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in the glycolytic pathway, fructose-1,6-bisphosphate ( fbp ) contains one phosphate each at blank. six carbon containing fbp is acted upon by aldolase to yield two triose phosphates: dihydroxyacetone phosphate ( dhap ) and glyceraldehyde-3-phosphate ( gap ). the blank-bound phosphate along with blank of fbp forms dhap , while blank along with phosphate-bound blank of fbp form gap . subsequent reaction steps result in the formation of pyruvate. the blank end of dhap or blank end of gap end up as blank of pyruvate, which yields co2 as it gets dehydrogenated to acetaldehyde. the acetaldehyde is converted to ethanol in the presence of alcohol dehydrogenase and nadh . hence, blank form of labeled glucose would give the most radioactivity in co2 and the least in ethanol.
Which form or forms of tagged glucose would offer yeast producing ethanol the highest radioactivity in CO2 and the least in ethanol?
What elements makes up carbon?A carbon atom has a nucleus made up of six protons and six neutrons that is encircled by six electrons. The first two electrons must occupy the inner atomic orbital according to quantum mechanics, while the other four electrons must have wavefunctions that only partially fill the second standard and three second primary orbitals.
How significant is carbon?Without carbon, there would be no way to support life on Earth. This is partially caused by carbon's propensity for forming bonds with other atoms, which gives biomolecules like DNA and RNA flexibility in their shape and functionality.
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which parameters are held constant in experiments 1 and 2? number of moles of gas temperature volume pressure
The parameters held constant in Experiment 1 are pressure and number of moles. The parameters held constant in Experiment 2 are temperature and number of moles.
What is apparent molecular weight of air?
The sum of the products of the mole fractions of each component times the molecular weight of that component is defined as apparent molecular weight.
What is pressure and temperature?
The force of all gas particle/wall collisions divided by the area of the wall is defined as pressure (P): Pressure is one of the primary observable quantities of this phase of matter; it is exerted by all gases.
Temperature is a measure of how hot or cold something is represented in terms of one of several scales, including Fahrenheit and Celsius. The direction in which heat energy will spontaneously flow is indicated by temperature.
The parameters held constant in Experiment 1 are pressure and number of moles. The parameters held constant in Experiment 2 are temperature and number of moles.
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for each half-reaction, which is a correct equation for an oxidation reaction? al(s) ---> al3 (aq) 3 e- na (aq) ---> na(s) e-
Al metal is converted into an aluminum ion with an oxidation number of +3, and hydrogen in water or KOH is reduced from an oxidation number of +1 to zero in hydrogen gas.
Aluminum is reduced as a result of an increase in electrons due to a decrease in the oxidation number. 4. Cu0 is the oxidized reducing agent, and Al3+ is the oxidizing agent. The Half-Reaction approach is one technique for balancing redox reactions.
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Can someone help me? If you pass an electric current through an iron nail, you will create an electromagnet. This magnet will pick up small objects, thus demonstrating that electrical energy can be converted into mechanical energy. Is there a way to use this principle to create a motor?
Only when an electric current is running through the coil of insulated wire that is wrapped around the iron nail will it behave like a magnet. The iron nail loses its magnetism when the electric current in the coil is stopped.
What is electric current ?An electric current is a stream of charged particles, such as electrons or ions, moving through an electrical conductor or space. It is measured as the net rate of flow of electric charge through a surface or into a control volume.
An electromagnet is a magnet that consists of a piece of steel or iron encircled by a coil. When an electric current is run through the coil, the metal turns magnetic.
Thus, The iron nail loses its magnetism when the electric current in the coil is stopped.
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The following scientists made significant contributions to our understanding of the structure and function of DNA. Place the scientists' names in the correct chronological order, starting with the first scientist(s) to make a contribution.
I. Avery, McCarty, and MacLeod
II. Griffith
III. Hershey and Chase
IV. Meselson and Stahl
V. Watson and Crick
The correct order of the scientists who made significant contributions to our understanding of the structure and function of DNA is II, I , III, V, IV.
In molecular biology, DNA is describes as the most important component that carries genetic information.
In DNA, the particular information is stored which is processed to manufacture large macro-molecules such as proteins.
The genetic information and instructions are stored in large structures called chromosomes which are found in each cell.
Great number of short fragments of DNA join together to form chromosomes which play their role in mutation, replication, gene expressing and encoding of information.
Simply put, detailed 3D-model of DNA was suggested by Crick and Watson in 1993 which shows that DNA is a double helix structure made up of nucleotide chains and nitrogenous bases.
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What happens to the temperature of a mixture of ice and liquid water as heat is applied at a constant rate?.
The mixture's temperature rises as the ice melts and then keeps rising at the same rate after all of the ice has melted.
What happens to the temperature of an ice water mixture when it is heated up while the ice and water are still present?Up until all of the bonds keeping the molecules in a crystal structure have been broken, nothing can be done to raise the kinetic energy of the molecules in the liquid state. So long as there is ice to melt, the temperature doesn't change. When water is heated to boiling, the same process takes place.
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what is the mole fraction of ethanol c2h5oh in an aqueous solution that is 46 perccent ethanol by mass?
The mole fraction of ethanol c2h5oh in an aqueous solution that is 46 percent ethanol by mass is 0.25
Mole fraction is the mole of one of the component of the solution divided by the total moles of the solution
Calculating the mole fraction of ethanol,we get
Percentage by weight of ethyl alcohol is 46% which implies in 100 g of this solution is 46 g while the mass of the water will be 54% of 100 g = 54g.
Finding the moles of water and the ethyl alcohol {molar mass of water(H₂O) = 18 and molar mass of ethyl alcohol(C₂H₆O = 46}
Moles = mass/molar mass
moles of ethanol = 46/46 = 1
moles of water = 54/18 = 3
ntotal=1+3=4
Mole fraction of ethanol is:
Mole of ethanol = 1/4
Total mole of solution
Hence, the mole fraction is 1/4 or 0.25
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equal volumes of equimolar aqueous solutions of sodium sulfite and hydroiodic acid are mixed. what net ionic equation describes this system ?
Na₂S₂O₃(aq) + 2HCl(aq) → 2NaCl(aq) + H₂O(l) + SO₂(g) + S(s). A light yellow precipitate develops as the process continues.
What does the chemistry term "equation" mean?Reaction equation are symbolic depictions of chemical reactions where the reactants and products are stated in relation to the following chemical formulae.
Equation and response are what?What is an equations and a chemical reaction? In a chemical change, bonds between molecules of the reagent are destroyed and new bonds between molecules of the product are established to create a new substance. A chemical formula is nothing more than a statement of fact that represents how reactants generate products.
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Calculate the volume of 1. 0 x 10-4 m cv+ solution that needs to be added to a 25. 0 ml volumetric flask and diluted with deionized (di) water in order to prepare a calibration standard solution with a concentration of 1. 0 x 10-5 m cv+. As part of your preparation for performing this experiment, repeat this calculation for each of the calibration standards you would need to prepare in part i a of the experiment and record the information in your notes so that you have it ready during the lab session. Also calculate the volume of 1. 0 x 10-4 m cv+ solution required to prepare 10 ml of 3. 0 x 10-5 m cv+ solution to be used in part ii b of the experiment and record the information in your notes.
2.5 ml and 3 ml of solution, respectively, are needed to make the final concentration of.
What is calibration standard solution?Standard addition, internal standard, and external standard techniques to quantitation all employ calibration solutions. Calibrants can be made gravimetrically using reference standards or pure reference materials, but they can also be made on a volumetric or other fraction basis.
How do you prepare a calibration solution?Calculate the volume of stock solution needed for each calibration standard by deciding on its number (minimum 5) and concentration. As often as necessary, repeat the treatment. Select and create the dilution solution (such as a matrix solution or 1% acid, for example). Both the working curve method and the standard addition method can be used to calibrate an instrument.
Briefing:Calibration standard solution is the solution prepared of the known concentration for the plotting of standard curve.
For preparing the solution of known concentration and volume, the equation imputed is :
M1V1=M2V2
Where M1 and V1 are molarity and volume of known solution
M2 and V2 are molarity and volume of solution to be prepared.
Given, volume to be prepared V2 : 25 ml
concentration to be prepared : M_2:1×〖10〗^(-5) M
concentration of given solution : M_1:1×〖10〗^(-4) M
1×〖10〗^(-4)×V_1=1×〖10〗^(-5)×25
Volume of solution required is 2.5 ml.
The volume required to prepare 10 ml solution of 3×10-5 M is:
1×10-4×V1=3×10-5×10
Volume = 3 ml.
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A electrolytic cell is set up as was done in this experiment but with a different metal. An average current of 144.2 mA is delivered for 16 minutes and 39 seconds. The cathode gains 0.1427 g in mass. If there are two moles of electrons transferred per mole of the metal, what is the molar mass of the metal?
The molar mass of the metal is 191.1g/mol.
Solution:
Since the formula for faraday's law of electrolysis is given by
Since m = 0.1427g, I = 144.2mA = 144.2mA *(1A/1000mA) = 0.1442 A= 0.1442C/s, t = 16min39s = 16min*(60s/1min) = 960+39 = 999 second Z = 2e-mol
Now put all values in the above formula
0.1427 g = (0.1442 C*999s*M*1 mole e-*1 mol/96485C*s*2e-mol)
M = (0.1427g*96485*2/0.1442*999*1)
M = 191.1538 g/mol = 191.1g/mol
Therefore the molar mass of metal will be 191.1g/mol.
For chemical elements that do not have isolated molecules such as carbon and metals, the molar mass is instead calculated by dividing by the number of atomic moles. Molar mass is defined as the mass in grams of one mole of a substance. The unit of molar mass is gram/mole, abbreviated g/mol.
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if a bottle of nail polish remover contains 179 ml of acetone, how much heat would be released by its complete combustion? the density of acetone is 0.788 g/ml .
If a bottle of nail polish remover contains 179 ml of acetone, −4349.7kJ. heat would be released by its complete combustion.
Given Data:
The volume of acetone is 179 mL.
The density of acetone is 0.788 g/mL.
Below is a diagram illustrating how acetone burns.
CH3COCH3 + 4O2 = 3CO2 + 3H2O
The heat released during the given reaction is -1790 kJ/mol. The negative sign represents the release of energy.
The formula to calculate mass from density and volume is shown below.
Mass= Density × Volume
Substitute the values of density and volume of acetone in the above formula.
Mass=0.788g/mol× 179mL=141.052g
The formula to calculate number of moles is as follows.
Number of moles=Mass/ Molarmass
Acetone has a 58.08 g/mol molar mass.
Substitute the values of mass and molar mass of acetone in the above formula.
Number of moles= 141.052g/(58.08g/mol)=2.43mol
The heat that is released from combustion of one mole of acetone is -1790 kJ/mol.
So, the heat that would be released from combustion of 2.43 mole of acetone is
(−1790kJ/mol×2.43mol) that is -4349.7 kJ.
Therefore, the heat that is released by combustion of 179 mL of acetone is
−4349.7kJ.
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5 g of gold and 25 g of silver are mixed to form a single-phase ideal solid solution. (a) how many moles of solution are there? (b) what are the mole fractions of gold and silver?
Mole fraction for silver= 0.2317643/0.3079193
= 0.7526787
Mole fraction for gold=0.076155/0.3079193
=0.2473212
What is Molar Fraction?
The mole fraction is the product of the number of molecules of a specific component in a mixture and its total molecular weight. It serves as a means of indicating how concentrated a solution is.
It is a unit of concentration, defined as the product of the moles of a component and the moles of the entire solution. When all the parts of a solution are summed up, their mole fraction equals 1.
molar mass of silver = 107.8682g/mol
Molar mass of gold= 196.96657g/mol
Therefore mole = mass/molar mass
For silver: 25g/107.8682g/mol = 0.2317643mol
For gold: 15g/196.96657g/mol= 0.076155mol
Total number of mole= 0.2317643+0.076155
= 0.30791193mol
Mole fraction for silver= 0.2317643/0.3079193
= 0.7526787
Mole fraction for gold=0.076155/0.3079193
=0.2473212
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Nuclear decay occurs according to first-order kinetics. What is the half-life of polonium-218 if a sample decays from 55. 4 g to 31. 7 g in 2. 50 minutes?.
The kinetics of first order governs nuclear decay. In the event that a sample degrades from 55.4 g - 31.7 g after 3.09 minutes, what is the polonium-218 half-life?
What is the purpose of polonium?Polonium is employed in research and antistatic devices because it is an alpha-emitter. It serves as a dominant male source there in form of a small layer on a steel disc. Eliminating static electricity from processes like rolling wire, paper, and sheet metal.
What polonium mass number is 218?For information pertaining to the periodic table chemical element polonium, please visit its element page. The chemical element of polonium is called polonium-218, and it has a half-life of 3.10 minutes and a relative atomic mass of 218.008966.
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