Answer:
1.84x10^-4 moles of cyanocobalamin
Explanation:
The challenge here is to find the molar mass of cyanocobalamin. The molecule has the chemical formula of:
C63H88CoN14O14P
Molar mass is calculated by adding the atomic masses of each atom in the compound. (e.g., 63 carbons at 12 each, etc.). The molar mass is found to be 1355.4 g/mole.
1355.4 grams of cyanocobalamin will contain 1 mole, or 6.02x10^23 molecules of cyanocobalamin. But we only have 250 mg, or 0.250 grams of the compound. Use the molar mass as a conversion factor by dividing the mass by the molar mass:
(0.250 g)/(1355.4 g/mole) = 1.84x10^-4 moles
The grams cancel and the moles moves to the top, leaving only moles cyanocobalamin. While 1.84x10^-4 moles of cyanocobalamin doesn't sound like much, it represents:
(1.84x10^-4 moles)*(6.02x10^23 molecules/mole) = 1.11x10^20 molecules of cyanocobalamin
How do weak intermolecular bond strengths affect the melting and boiling point of a substance?.
Intermolecular forces can be used to estimate relative boiling points (IMFs).The relationship between the substance's vapor pressure and boiling point depends on the strength of the IMFs.
What exactly is boiling point?The point at which a liquid's vapor pressure equals the gas pressure above it is known as the boiled point of the liquid. The temperature that a liquid's vapor pressure equals one atmosphere is considered the liquid's typical boiling point (760 torr). The view from a distance. view from a distance of a bubble in hot water.
What other name does boiling point go by?Boiling point and saturation temperature are synonyms. Sometimes the measurement's pressure serves as a definition for the boiling point. The standard boiling point was established by the International Alliance of Basic and Applied Chemistry (IUPAC) in 1982 as the temperature at which water boils at one bar of pressure.
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the accumulation of acetaldehyde throught the consumption of alchol or by the use of the drug antabuse produces a feeling of
The accumulation of acetaldehyde throught the consumption of alchol or by the use of the drug antabuse produces a feeling of hangover.
This is because acetaldehyde is toxic and can cause a variety of symptoms, such as headache, nausea, dizziness, fatigue and dehydration. It is also believed to be partly responsible for the alcoholic flushing reaction seen in some people. Acetaldehyde is also known to increase the risk of certain types of cancer, especially in heavy drinkers.
What is acetaldehyde?Is a colorless, flammable, and pungent-smelling chemical compound. It is a reactive intermediate in a wide range of metabolic processes, and it is also an important industrial chemical used in the production of pharmaceuticals, plastics, and other chemicals.
Acetaldehyde is also a toxic air contaminant and is classified as a probable human carcinogen.
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Partial bonding, for example, as part of a resonance hybrid, often results in structures with _____.
Answer:
fractional bond orders
Explanation:
because fractional bond orders
Give the percent yield when 28. 16 g of co2 are formed from the reaction of 6. 000 moles of c8h18 with 3. 000 moles of o2.
25% of carbon dioxide gas is produced. when 6. 000 moles of c8h18 and 3. 000 moles of o2 react to produce 28. 16 g of co2.
The meaning of percent yield
The actual yield is calculated as the theoretical yield multiplied by 100 to get the percent yield. Actual Yield / Percent Yield Theory Yield) = 100% There are various reasons why a chemical reaction's actual yield could be lower than its theoretical yield; these will be covered in more detail in later chapters of the course.
What does a high yield percentage indicate?
Yield percentages might range from more than 100% to less than 100%. A higher yield % can be a sign that there is water in your product, too much reactant, or other contaminants. decreased percent
Briefing:
Theoretical mass of
co2= no.of moles×molecular mass of co2=2.56mol*44g/mol=112.64g
Experimental mass of co2 = 28.16 g
percentage yield=28.16*100/112.64=25%
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a sample of xenon gas occupies a volume of 6.51 l6.51 l at 473 k.473 k. if the pressure remains constant, at what temperature will this same xenon gas sample have a volume of 3.33 l?
Temperature will this same xenon gas sample have a volume of 3.33 l is 241.94k.
Charles' law states that the volume of a given amount of gas held at constant pressure is directly proportional to its Kelvin temperature. This means that as the temperature increases, the volume also increases, and vice-versa. The equation used to solve gas problems involving Charles' law is:
[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]
Rearrange the equation given above to isolate T2 . Insert your data into the new equation and solve.
[tex]T_2=\frac{V_2 T_1}{V_1}[/tex]
[tex]T_2=\frac{3.33 L\times 473\mathrm{~K}}{6.51 \mathrm{~L}}[/tex]= 241.94k
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Give the group number leg, 1A(1)I and general electron configuration (e.g, nsnp?) of an element with each electron-dot symbol: Group number: Electron configuration: Group number: Electron configuration:
The 5 electrons are present in the valence shell so group number 15 or VA or 5A electronic configuration ns^2 np^3, 4 electrons are present in the valence shell so the group number 14 or 1VA or 4 A electronic configuration ns^2 np^2.
What is an electron ?
The negatively charged components of an atom are known as electrons. All of an atom's electrons combine to form a negative charge that counteracts the positive charge of the protons in the atomic nucleus. In comparison to all the other components of the atom, electrons are quite tiny.
What is an electron configuration?
The placement of electrons in orbitals around a nuclear nucleus is known as electronic configuration, also known as electronic structure or electron configuration.
A, 5 electrons are present in the valence shell so group number 15 or VA or 5A electronic configuration ns^2 np^3.
B, 4 electrons are present in the valence shell so the group number 14 or 1VA or 4 A electronic configuration ns^2 np^2
Therefore, 5 electrons are present in the valence shell so group number 15 or VA or 5A electronic configuration ns^2 np^3, 4 electrons are present in the valence shell so the group number 14 or 1VA or 4 A electronic configuration ns^2 np^2.
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acetyl coa carboxylase generates malonyl-coa from acetyl-coa co2. in the biosynthesis of palmitate, what is the fate of the carbon atom in the co2 that was incorporated into malonyl-coa?
A 3-carbon dicarboxylic acid called malonate is linked to Coenzyme A in malonyl CoA. Using the biotin cofactor of the enzyme acetyl-CoA carboxylase, malonate is created from acetyl-CoA by adding CO₂ .
What is the source of malonyl-CoA?Acetyl-CoA carboxylase (Acc1p) produces malonyl-CoA, which is produced as the first and only step in the production of fatty acids. The activity of Acc1p is closely controlled both transcriptionally and post-translationally, and Snf1p protein kinase phosphorylation of Acc1p inhibits its activity.
Is malonyl-CoA an extender or starter?All forms of PKSs use malonyl-CoA as an extender unit. Malonyl-CoA is always incorporated into the developing polyketide through a decarboxylative Claisen condensation between the carboxyl group of a thioester and the enolate ion produced by malonyl-decarboxylation. CoA's .
Is CO2 used in fatty acid synthesis?Although CO2 or HCO3 are not absorbed into the fatty acids, the need for carbon dioxide as a bicarbonate ion is a crucial component in the production of fatty acids. This indicates a method where CO2 is initially given to a precursor, serving its role, and then eventually withdrawn.
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calculate the molar concentration of so4 2- in a solution made by dissolving 55.0 grams of al2(so4)3 in enough water to produce 2.00 l of solution.
The molar concentration of [tex] {SO_{4}}^{2 - } [/tex] is 2.4
Firstly understanding the concentration [tex] {SO_{4}}^{2 - } [/tex], which will be 3. Hence, each molecule will release three sulphate ions.
Molar concentration = number of moles ÷ volume of solution in litres
Molar mass of aluminium sulphate = 342 g/mol
Number of moles = 55/342
Performing division
Number of moles = 0.16
Molar concentration = 0.16/2
Performing division
Molar concentration = 0.8
Molar concentration of sulphate ions = 0.8 × 3
Molar concentration of sulphate ions = 2.4
Thus, the molar concentration is 2.4.
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suppose both the electron affinity of and the heat of sublimation of were smaller. would be more stable? or less?
If both electron affinity and heat of sublimation are smaller, then MX would be less stable.
M²⁺ + X⁻(g) → MX(s), + Lattice energy
Therefore, from the given thermodynamic cycle,
Lattice enthalpy = -100-800 = -900kJ/mol
Lattice enthalpy MX = -900kJ/mol
Enthalpy of the formation of MX is given as follows:
M(s) + 1/2X₂(g) --------->M(g) + 1/2 X₂(g)
Enthalpy of formation = +250 kJ
M(g) + 1/2X₂(g) → M(g) +X(g)
Enthalpy of formation = +350 kJ
M (g) + X(g) ------> M²⁺(g), + X(g)
Enthalpy of formation = +400 kJ
M²⁺ (g) + X(g) 24→ M²⁺(g), + X(g)
Enthalpy of formation = +200kJ
M²⁺(g), + X⁻(g)→ MX(s)
Enthalpy of formation= +900kJ.
Enthalpy of formation of MX = 250 +350 +406-200-900 = -100 kJ
Therefore, Enthalpy of formation of MX = -100 kJ
Since electron affinities are the heat released while the heat of sublimation is the heat absorbed then if electron affinity decreases while the heat of sublimation, increases then the overall enthalpy of formation of MX will be less negative. Hence in that case MX would be less stable.
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the molecular geometry of the chf3 molecule is , and the molecule is . question 12 options: a) seesaw, nonpolar b) tetrahedral, polar c) tetrahedral, nonpolar d) trigonal pyramidal, polar e) seesaw, polar
the molecular geometry of the chf3 molecule is tetrahedral , and the molecule is polar.
Trifluoromethane, also known as fluoroform, is a compound with the molecular formula CHF₃.
This is because three fluorine atoms and one hydrogen atom are bonded to the central carbon atom, and the carbon atom has zero lone pairs. Therefore, the molecular structure and shape of CHF₃is tetrahedral.
A net dipole moment exists because the CHF₃molecule has three polar carbon-fluorine bonds. Therefore, CHF₃ is a polar molecule.
therefore,the molecular geometry of the CHF₃ molecule is tetrahedral , and the molecule is polar.
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what pressure would it take to compress 250. l of helium gas initially at 1.00 atm into a 2.00 l tank at constant temperature?express your answer with the appropriate units.
1.25atm is the pressure required to compress 250l of helium gas.
What is Helium gas?
The chemical element helium has the atomic number 2 and the symbol He. It is the first member of the noble gas group in the periodic table and is a colourless, odourless, tasteless, non-toxic, inert, monatomic gas. Of all the elements, it has the lowest melting and boiling points.
What is pressure?
The force delivered perpendicularly to an object's surface per unit area across which that force is dispersed is known as pressure.
Calculations:
Here the temperature is constant.
Given
P1 = 1atm
V1 = 250L
P2 = ?
V2 = 2 L
Hence,
P1V1 = P2V2
P2 = P1V1/V2
P2 = 250L × 1atm/200L = 1.25atm.
Hence, 1.25atm is the pressure required to compress 250l of helium gas.
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in the oxidation reaction of 9-fluorenol with sodium hypochlorite solution and glacial acetic acid, what is the reducing agent? enter the correct chemical name of the reducing agent.
Sodium thiosulfate, also known as Na2S2O3, is a reducing agent that interacts with any remaining oxidizing agent to quench it. (Thus, the name thiosulfate, which is similar to sodium sulfate with one O changed to a S.)
The inorganic chemical sodium thiosulfate has the formula Na2S2O3xH2O. Usually, it can be found as the pentahydrate Na2S2O35H2O, which is white or colorless. The solid is a well-dissolving efflorescent crystalline material.
Some of the negative effects of cisplatin may be mitigated with sodium thiosulfate. When treating cyanide poisoning in an emergency, it is additionally combined with another medication.
Hypo is an acronym for one of sodium thiosulfate's historically more popular names, hyposulfite of soda. A significant inorganic salt with numerous medical applications is sodium thiosulfate. It is also referred to as "hypo" sodium hyposulfite.
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Part A What is produced at each electrode in the electrolysis of NaBr(aq)? Drag the appropriate items to their respective bins. View Available Hint(s)
In the provided query, bromine gas ([tex]\rm Br_2[/tex]) and sodium metal ([tex]\rm Na[/tex]) are produced when NaBr (Sodium bromide) is electrolyzed in an aqueous solution.
Electrolysis is the method of driving a non-spontaneous chemical reaction with an electric current.
In this reaction, sodium bromide is broken down into its constituent elements, bromine and sodium. Bromine is produced at the anode and sodium is produced at the cathode.
Overall reaction: [tex]\rm 2NaBr \rightarrow Br_2 + 2Na[/tex]
When NaBr(aq) is electrolyzed, the following reactions occur at the electrodes:
At the anode (positive electrode): Br- ions are oxidized to Br2 gas and electrons.
[tex]\rm 2Br^- \rightarrow Br_2 + 2e^-[/tex]
The reaction at the anode involves the oxidation of bromide ions to bromine gas.
At the cathode (negative electrode): Na+ ions are reduced to Na metal and electrons.
[tex]\rm 2Na^+ + 2e^- \rightarrow 2Na[/tex]
The reaction at the cathode involves the reduction of sodium ions to sodium metal.
Therefore, when NaBr(aq) is electrolyzed, bromine gas and sodium metal are produced.
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after 21 days, a radioactive substance has decayed to 30.5% of its original amount. after an additional 51 days, what percent of its original amount will it have decayed to
Use the half-life calculator to analyze radioactive decay the substance will have decayed after the time the half-life has elapsed.
Radionuclides or radioactive substances are a class of chemical compounds where the nucleus of the atom is risky. They obtain balance via changes in the nucleus's spontaneous fission, emission of alpha debris, or conversion of neutrons to protons or the reverse.
Radon is a radioactive gasoline that has no color, odor, or flavor. Radon comes from the decay of uranium, which is a radioactive detail found naturally within the Earth's crust. Over billions of years, uranium decays into radium, and finally into radon.
Radioactive sources are used to observe dwelling organisms, diagnose and deal with diseases, sterilize clinical units and food, produce energy for heat and electric electricity, and to screen diverse steps in all types of business methods.
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a mixture of 0.220 moles rn, 0.350 moles o2 and 0.640 moles ar has a total pressure of 1.65 atm. what is the partial pressure in atm of o2?
The partial pressure in atm of O2 is 0.47 atm
What do you mean by moles?
A mole is simply a unit of measurement. In fact, it's one of the seven base units in the International System of Units (SI). Units are invented when existing units are inadequate. Chemical reactions often take place at levels where using grams wouldn't make sense, yet using absolute numbers of atoms/molecules/ions would be confusing, too. So, scientists invented the mole to bridge the gap between very small and very large numbers.
No. of moles of Rn = 0.220 moles
No. of moles of O2 = 0.350 moles
No. of moles of Ar = 0.640 moles
Total no. of moles = 1.21 moles
Mole fraction of O2 , xO2 = 0.350moles / 1.21 moles = 0.289
Total pressure = 1.65 atm
Partial Pressure of O2 = Mole fraction of O2* Total Pressure
= 0.289 * 1.65 atm
= 0.47 atm
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explain why it is usually easier to calculate an enzyme's reaction velocity from the rate of appearance of product rather than the rate of
In most circumstances, it is easier to calculate an enzyme's reaction velocity than to calculate the rate at which a SUBSTRATE disappears.
What role does an enzyme play? It is what?
Enzymes are made of proteins, which are the fundamental units of all living things. They serve as catalysts, accelerating metabolic reactions beyond what they would have done on their own. Simply said, without enzymes, such reactions wouldn't occur or would occur too slowly to support life.
What does the word "enzyme" actually mean?
A specific kind of biological catalyst called an enzyme is almost always a protein. It speeds up a particular chemical reaction in the cell. The enzyme is continually employed during the reaction and is not lost.
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calculate the quantity of 0.001 m aq naoh needed to neutralize the hcl produced by complete solvolysis
The formula for the reaction between NaOH and HCl is NaOH + HCl = NaCl + H2O. So, the molar ratio of NaOH and NCl must be neutralize the solution. So, we require 150 milliliters, or 0.3*50/0.1.
What is the value of a molar?
A chemical's molar mass is its mass in grams per mole. The quantity of atoms, molecules, and ions contained in a substance is measured in terms of moles. A mole of any substance contains 6.022 x 1023 molecules.
What precisely is a molar?
The molars, also called molar teeth, are large, flat teeth located near the back of the mouth. Animals that are mammals have advanced more. Usually used to pulverize food while it is being eaten. The word "molar" is Latin in origin.
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the procedures instructs a student to measure 7.55 ml of solution 1. the student measures 11.89 ml of solution 1. what is the percent (by volume) of extra liquid measured by the student?
The procedures tells a student to measure 7.55 ml of solution 1 but the student measures 11.89 ml of solution 1. The percent by volume of extra liquid measure by the student added is 36.50%.
The percent by volume for any solution is calculated as%(v/v)=(volume of solute/volume of solution)×100
In the given problem, the volume of solution is 11.89 ml and the volume of the solute is
volume of solute=(11.89-7.55)ml
volume of solute=4.34ml
We cannot consider the volume used to measure by procedure because the total volume is increased by extra addition of the solute. Plug all values in the formula
%(v/v)=(4.34 ml/11.89 ml)×100
%(v/v)=0.36501×100
%(v/v)=36.501%
%(v/v)=36.50%
Therefore, the concentration of a liquid measured by the student is 36.50 ml.
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a gas at a pressure of 80.0 mm hg occupies 10.5 liters. what is the volume when the pressure is increased to 90.0 mm hg?
The volume when the pressure is increased to 90.0 mm hg is 9.33 L.
An ideal gas is a theoretical gas composed of many randomly transferring factor particles that aren't difficult to interparticle interactions. the best gasoline idea is beneficial because it obeys the precise gas law, a simplified equation of country, and is amenable to evaluation under statistical mechanics.
An ideal gas is described as one for which both the extent of molecules and forces between the molecules are so small that they have got no effect at the behavior of the gas. The real gas that acts almost like a really perfect gasoline is helium. that is due to the fact helium, in contrast to maximum gases, exists as an unmarried atom, which makes the van der Waals dispersion forces as low as viable
Using the ideal gas equation:-
Given;
P₁ = 80.0 mm hg
V₁ = 10.5 liters
P₂ = 90.0 mm hg
V₂ =
P₁V₁ =P₂V₂
V₂ = P₁V₁/P₂
= 9.33 L
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Nuclear decay occurs according to first-order kinetics. How long will it take for a sample of chromium-51 to decay from 35. 0 grams to 10. 0 grams? the half-life of chromium-51 is 28 days.
This sample of chromium-51 will degrade from 35 grams to 10 grams over the course of 84 days.
What is nuclear explain?This energy found in an atom's nucleus, 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. A compact nucleus of an atom has a tremendous amount of energy.
Who is the world nuclear power?The United States, which will produce 771,638 GWh in nuclear energy in 2021, will be by far the greatest nuclear electricity generator, followed by China, which will produce 383,205 GWh. 56 reactors with a total power of 57,848 MWe and 438 reactors with such a net power of 393,333 MWe were operating as of August 2022.
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What happens to the chemistry of the seawater as more co2 is absorbed into the oceans?.
Answer:
As more CO2 is absorbed into the oceans, the chemistry of the seawater changes. The pH of the seawater decreases, making it more acidic. This can have a negative effect on marine life, as many species are sensitive to changes in pH. Additionally, the increased acidity can cause the dissolution of calcium carbonate, which is an important component of coral reefs and other marine habitats.
identify all resonance structures for the following radical. there may be more than one correct anwserTo receive credit, make sure to select all that apply.
For the following radical, all the resonant structures listed in the options are correct.
The process of finding resonant structures for a given radical begins with drawing the Lewis structure of the radical. This includes connecting the atoms in the radical with single bonds and placing the lone electron pair on the atom with the highest electronegativity.
Once the Lewis structure is drawn, the radical can be examined to determine possible resonance structures. Resonance involves the movement of electrons to create different structures with the same overall charge and atom connectivity. In some cases, the lone electron pair may move to form a double bond or vice versa.
It is important to remember that resonance is a dynamic process, meaning that the electrons are constantly moving between the different structures. This means that all of the resonance structures should be drawn and considered when evaluating the resonance of a radical.
Once all of the resonance structures are drawn, the relative stability of each structure can be assessed. This is done by evaluating the formal charges of the atoms in each structure and determining which structure has the most stable charge distribution. The most stable resonance structure will usually be the one with the lowest overall formal charges.
Once the most stable resonance structure is determined, the other resonance structures can be assessed to determine the degree of resonance. The resonance energy of a radical is typically assessed by determining the difference in energy between the most stable resonance structure and the other structures.
Overall, finding resonant structures for a given radical involves drawing the Lewis structure of the radical, determining possible resonance structures, and evaluating the relative stability of each structure. By doing this, it is possible to identify the most stable resonance structure and determine the degree of resonance of the radical.
By doing so, we get all the given structures are resonant structures as they show homolytic cleavage of π bonds to the given radical. The image attached below gives a clear understanding of the resonance.
Hence, all the structres are correct.
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Equal volumes of 0.2 M solutions of lead (II) nitrate and potassium bromide are combined to form lead (11) bromide as a yellow precipitate. Which of the following is the correct net ionic equation for the reaction? (A) Pb 2+ (aq) + 2Br. (aq) → PbBra(s) (B) K. (aq) + NO3- (aq) → KNO3 (s) (C) Pb 2+ (aq) + 2NO3- (aq) + 2K+ (aq) + 2Br. (aq) → PbBr2(s) + 2K+ (aq) + 2NO3- (aq) (D) Pb(NO3)2 (aq) + 2KBr (aq) → PbBr2 (s) + 2KNO, (aq)
Pb²⁺ (aq) + 2Br(aq) → PbBr₂ (s) is the correct net ionic equation for the given reaction.
When equal volumes of 0.2M solutions of lead(II) nitrate and potassium bromide are combined, it forms a yellow precipitate of lead (II) bromide . This reaction is an example of a double displacement reaction.
A double replacement reaction is a chemical reaction in which mutual exchange of cations and anions of the reactants take place to form two different products. Usually, precipitates are formed in this reaction.
The reaction between lead(II) nitrate and potassium bromide takes place as follows:
Pb(NO₃)₂ (aq) + 2KBr (aq) → PbBr₂ (s) + 2KNO₃ (aq)
By splitting the electrolytes into ions we get the complete ionic equation which is written as:
Pb²⁺ (aq)+ 2NO₃⁻(aq) + 2K⁺(aq) + 2Br⁻(aq) → PbBr₂(s) + 2K⁺(aq) +2NO₃⁻(aq)
By cross eliminating the ions on both sides of the reaction , we get the net ionic equation which is given as:
Pb²⁺ (aq) + 2Br⁻(aq) → PbBr₂(s )
Hence option (A) is the correct net ionic equation for the given reaction.
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A metal cools from an initial temperature of 225 oc to 25 oc and releases 160 j of heat energy. If the mass of the metal is 5. 0 g, what is its specific heat capacity?.
When a material is cooled from a temperature of 225 ° c temperature to 25 oC, 160 j worth heat energy are released. H=0.17 J/g*C is the metal's specific heat capacity if its mass is 5.0 g.
Describe heat.Heat is the interchange of "thermal" energy caused by a temperature difference. Consider a system that is isolated and has two components that are initially running at different temperatures. Energy is transmitted from the large heat subsystem 2 to the cooler temperature subsystem 2.
Why is heat produced?Atoms and molecules move more quickly and clash when the temperature rises, producing excess heat (also known as heat energy). The energy that comes from a heated substance's temperature is known as thermal energy.
Briefing:=160 J released
=5.0 g metal
=A temperature change of (225-35) or 190C.
=160J/(5.0g*190C) = 0.1684 J/g*C
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Put the following chromatography solvent in order of polarity as a chromatography solvent: acetone, npropanol, water, hexane, diethyl ether, methanol. 2) You will be doing chromatography with a mixture of n-propanol and water. Would it make sense to add 5) Two cars full of people took a day trip. Car A had a lot of little kids and stopped at lots of rest stops and gas stations to give them a break. Car B had just adults in it, and only stopped once. Of course Car B got to the destination first. Explain how this in an analogy for the chromatography you are doing in this experiment help please
LEAST TO MOST POLAR- hexane,diethyl ether,acetone,n-propanol,water ,methanol
Considering the problem we can say that the kids are compared to be more polar or smaller molecular weight compounds. The more polar compounds interact with silica more just as the kids bus stopped at every point and reached the destination late. Whereas, the adult bus is compared to be less polar compounds or high molecular weight which interacts less and reaches the destination faster.
Thus more polar compounds reaches the destination late whereas less polar compound reaches first.
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Why are a weak acid and the salt of its conjugate base used in preparing a buffer, rather than a strong acid and a salt of its conjugate base?.
An acid is more acidic than its conjugate base if its pKa value is less than or equal to seven.
When making a buffer, why do you utilize a weak acid and the salt of its conjugate base?A weak acid and its conjugate base are present in high amounts in buffer solutions (or a weak base and its conjugate acid). Buffers are extremely resistant to fluctuations in pH because these ingredients may neutralize extra H+ or OH.
Why is it necessary to create a buffer solution using both an acid and a base?In buffers, basic species are present to neutralize H + ions and acidic species to do the opposite. These two species must, nevertheless, be able to coexist in a solution without fully negating one another.
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If exactly one molecule of solute is present in 1. 00 l of solution, what is the concentration of the solution?.
The concentration is 1.66x10-24 M if there is exactly one molecule of the solute in one litre of solution.
In this situation, 1 mole is defined as 6.02x10²³ particles, or molecules. As a conversion factor, consider the following:
1 mole = 6.02 x 10²³ molecules.
When only 1 molecule of the solute is present, use this conversion factor to determine moles of the solute:
1.66x10-24 moles are equal to (1 molecule)/((1 mole)/(6.02x1023 molecules)).
Only moles remain after the molecules cancel.
By definition, concentration is the number of moles of a solute per litre. Divide the volume, in this case 1.0L, by the 1.66x10-24 moles to get:
1.66x10-24 molar, or
1.66x10-24 M, = (1.66x10-24 moles solute)/(1.0 litre).
What is a molecule's chemical formula?
Subtract the compound's molar mass from the empirical formula mass. A whole number or a number very close to a whole number must be the result. Divide each subscript in the empirical formula by the full number from step 2 to get the result. The end outcome is the molecular equation.
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calculate the formula mass of rubidium carbonate, rb2co3. 340.43 amu 255.00 amu 113.48 amu 230.95 amu 145.47 amu
The formula mass of rubidium carbonate is rb2co3. Then formula mass is 230.95a mu.
[tex]$\text { Wt } \text { of } R b & =85.4678$[/tex]
[tex]$\text { Wt } \text { of } c & =12.0107$[/tex]
[tex]$\text { Wt } \text { of } 0 & =16 $[/tex]
[tex]$\text { Wt } \text { of } R b_2 \omega_3 & =85.4678 \times 2+12.0107+16 \times 3$[/tex]
=230.946
so formula mass =230.95a mu.
The mass of a substance is given in atomic mass units and is calculated by adding the average atomic masses of all the atoms in the substance's chemical formula. The molecular mass is another name for a covalent compound's formula mass.
The total atomic masses of the component atoms of an ionic compound are used to define a substance's formula mass. This is typically used for ionic compounds, which are made up entirely of ions rather than distinct molecules. By summing the masses of each individual atom in the compound's formula, the formula mass is determined.
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How much heat is needed to condense 22.25 grams of nitrogen gas at â€""195.8°c? the latent heat of vaporization of nitrogen is 199.0 j/g. joules
As per the question, the mass of the nitrogen gas m = 22.25 gram.
The latent heat of vaporization of nitrogen = 199.0 j/g
As per the question, the nitrogen gas will condense. During condensation, the nitrogen gas will lose or release heat equal to its latent heat.
Hence, the heat released by nitrogen gas Q = ml = 22.25 × 199.0 J = 4427.75 J.
Hence, the amount of heat released will be 4427.75 J.
How can you figure out how much heat is in each gram?The formula: can be utilized to determine energy. Q = mc ∆T. In the equation, Q stands for energy expressed in joules or calories, m for mass expressed in grams, c for specific heat, and T for temperature change, which is the difference between the final temperature and the initial temperature. Water has a specific heat of 1 calorie/gram °C.
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when a cold drink is taken from a refrigerator, its temperature is 5°c. after 25 minutes in a 20°c room its temperature has increased to 10°c. (round your answers to two decimal places.)
Temperature after 40 minutes is 12.15 degree C
T= [tex]Ce^{kt}[/tex] +Ts
Setting T=T0 (initial temperature of cold drink) at t=0 then we have
T0= [tex]Ce^{0}[/tex]+ Ts ⟺ C=T0−Ts
Now, we have
T=(T0−Ts)ekt+Ts
ekt=T−TsT0−Ts
t=1kln(T−TsT0−Ts)(1)
Given condition: Temperature rise of cold drink from T0=5∘ C→T=10∘ C in time t=25 minutes & Ts=20 degree celsius substituting values in (1) we get
25=1kln(10−205−20)
k=125ln(23)
a) Temperature T after t=40 minutes, setting corresponding values in (1), we get
40=1125ln(23)ln(T−205−20)
ln(20−T15)=4025ln(23)
20−T15=(23)8/5
T=20−15([tex]2/3^{8/5}[/tex]) ≈ 12.15 degree C
Temperature is a unit used to represent how hot or cold something is. It can be stated using the Celsius or Fahrenheit scales, among others. Temperature shows which way heat energy will naturally flow, i.e., from a hotter (body with a higher temperature) to a colder (body with a lower temperature) (one at a lower temperature)
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