The equilibrium law for the nuclide is 0.386 days per one, according to the announcement.
What are nuclides? Why do they maintain their stability?Any form of atoms with a measured lifetime is referred to as a nuclide. Atomic nuclei, also known as nuclides (nuclei of various isotopes), are kept together by the weak nuclear interaction and are made up of Z protons and N nuclei with just a mass of A (mass number=Z+N). The amount of protons increases as the electron configuration does, and protons are given to the nucleus to maintain stability.
Briefing:t = 2.303 * 1/λ log (A₀/At)
λ = 2.303/t log (A₀/At)
= 2.303/3.40 log (45/12.1)
= 0.677*0.57
= 0.386 day⁻¹
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Which of the following is true of zinc?
a. Grains are the most reliable food sources of zinc.
b. Excess zinc can decrease copper absorption.
c. All of its functions involve it acting as a cofactor for enzymes.
d. It binds to most proteins in the body.
The true statement about zinc is b. Excess zinc can decrease copper absorption.
Zinc is a trace elements or a micronutrient. It means it is required in low amounts to the body. It is also an essential element required by the body. We intake zinc through diet, form the vegetables and fruits, stating their importance in diet.
The body receives around 20 to 40% of the zinc from the food. Calcium is also a trace essential element required by the body. Several studies intake decrease in copper absorption on excess zinc. Calcium is required for vitamin D synthesis and bones. Zinc is required for better metabolism, immune system through enzyme function.
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alpha polonium crystalizes in a simple cubic unit cell with an edge length of 336 pm. whatis the density of alpha polonium (in g/cm^3)?
alpha polonium crystallizes in a simple cubic unit cell with an edge length of 336 pm, the density becomes 7.318 g/cm³.
What is unit cell?The smallest repeating unit with complete crystal structural symmetry is designated as a unit cell. The unit cell geometry, sometimes referred to as a parallelepiped, provides six lattice parameters, which are the lengths of the cell edges (a, b, and c) and the angles at which they are spaced apart ( α,β,γ ).
Given that,
alpha polonium crystallizes in a simple cubic unit cell with an edge length (a) of 336 pm.
As we know, the relation between radius (r) and edge length (a) for simple cubic unit cell is: 2 r = a
Thus, r = a/2
r = 336/2 [ given a = 336 pm]
r = 168 pm
Now, density (d) = (Z × M) / a³ × [tex]N_A[/tex]
Here, Z = number of atom in a simple cubic unit cell = 1
M = molecular weight of polonium
[tex]N_A[/tex] = Avogadro's no.
d = ( 1 × 209) / (168 ×10⁻¹²)³ × (6.023 × 10²³)
d = 7.318 × 10⁷ g/m³
d = 7.318 g/cm³
So, the density of alpha polonium is 7.318 g/cm³.
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what does the detector measure, and how are these numbers used to calculate transmittance and absorbance?
Absorbance is measured using a spectrophotometer or microplate reader, which is an instrument that shines light of a specified wavelength through a sample and measures the amount of light that the sample absorbs.
A spectrophotometer or microplate reader, which is a device that shines light of a certain wavelength through a sample and measures the amount of light that the sample absorbs, is used to quantify absorbance.Utilizing the ratio of light entering and leaving the sample, transmission is calculated in a photometer. From the transmission's negative decadic logarithm, absorbance is computed. After this, the detector gauges the sample's transmittance and absorbance. The amount of light that totally penetrates the sample and reaches the detector is referred to as transmittance. The amount of light that the sample is able to absorb is measured by its absorbance.To learn more about transmittance visit:
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what is the formal charge on the central atom in a molecule of o3? hint: it may be helpful to draw the lewis structure for this molecule
A molecule's formal charge is the total of the formal charges of each of the constituent atoms that make up that particular molecule.
What is the Lewis structural rule?
Hydrogen atoms can only make one bond, and they are always located at the ends of atom chains. Hydrogen is usually associated with carbon, nitrogen, or oxygen. Oxygen atoms normally do not bond to one another, with the exception of O2, O3, superoxides, and peroxides.
Describe Lewis's structure with an example.
The octet rule, which states that atoms share electrons so that each has eight in its outer shell, is the foundation of a Lewis structure. For instance, the outer shell of an oxygen atom has six electrons.
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pre-lab questions: what are the properties of ionic compounds? what are the properties of covalent compounds? which type of compound is salt? which type of compound is sugar?
The properties of the compounds are given as following:
The physical properties of the ionic compounds are they are hard, form crystals, have high melting and boiling point, good insulators.The physical properties of the covalent compound are they are soft, do not form the crystal, have low melting and boiling point, bad insulators.Sugar is classified under covalent compound.Covalent compound
The atoms of covalent compounds are bonded between each other by covalent bonds. Covalent compounds make bonds by sharing one or more pairs of valence electrons.
Ionic compound
The atoms of ionic compound contains ions or charged particles. ionic compounds make bonds when an atom or more atoms lose or gain electrons.
Thus, the properties of compounds are:
The physical properties of the ionic compounds are they are hard, form crystals, have high melting and boiling point, good insulators.The physical properties of the covalent compound are they are soft, do not form the crystal, have low melting and boiling point, bad insulators.Sugar is considered as a covalent compound.Learn more about properties of compounds from the link given below.
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Give the net ionic equation for the reaction (if any) that occurs when aqueous solutions of sodium sulfide and iron(II) nitrate are mixed. O Na+(aq) + NO3(aq) - NaNO3(s) O No reaction occurs. OS2-(aq) + Fe2+(aq) → FeS(s) O 2 Nat(aq) +52-(aq) + Fe2+(aq) + 2 NO3(aq) – 2 Nat(aq) + 2NO3 (aq) + 2 FeS(s) O 2 Na(aq) + 52 (aq) + Fe2+(aq) + 2 NO3 (aq) Fe2+(aq) + 52 (aq) + 2 NaNO3(s)
The net ionic equation for the reaction (if any) that occurs when aqueous solutions of sodium sulfide and iron(II) nitrate are mixed.
The answer is:-
[tex]2Na^{+}(aq) + S^{2-} + Fe^{2+} + 2NO_{3}^{-}(aq) -- > 2Na^{+}(aq) + 2NO_{3}^{-}(aq) + 2FeS(s)[/tex]
Ionic Equation:-
an ionic equation is a chemical equation in which the electrolytes in an aqueous solution are expressed as dissociated ions. Usually, this is a salt dissolved in water, where the ionic species are followed by (aq) in the equation to indicate they are in an aqueous solution.
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ammonium nitrate decomposes explosively upon heating according to the following balanced equation: 2nh4no3(s)→2n2(g) o2(g) 4h2o(g) part a calculate the total volume of gas (at 135 ∘c and 769 mmhg ) produced by the complete decomposition of 1.59 kg of ammonium nitrate.
The total volume of gas (at 135 ∘c and 769 mmhg ) produced by the complete decomposition of 1.59 kg of ammonium nitrate is 1687.74 L.
Solution:
PV = nRT
Dividing both sides by P we get,
V = nRT / P
V = (68.25 × 62.363 × 297) / 749
V = 1687.74 L.
NH₄NO₃ → N₂O + 2H₂O.
When ammonium nitrate NH₄NO₃ is heated it produces nitrous oxide N₂O and water H₂O. The given equation is the balanced chemical reaction for the decomposition of ammonium nitrate by applying heat. It is observed that 1 mol of ammonium nitrate breaks down into 1 mol of nitrous oxide and 2 mol of water molecules.
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how does the titration curve of a diprotic acid differ from that of a monoprotic acid? select one: the curve does not level off after the equivalence point. there are two curves. there are two equivalence points.
The titration curve for a diprotic acid differs from that of a monoprotic acid in that, there are two equivalence points. Correct answer: letter C.
Since, the first equivalence point occurs when the solution has been neutralized by half of the protons of the acid, and the second equivalence point occurs when the solution has been neutralized by all the protons of the acid.
The differences between diprotic and monoprotic acidsAre two different types of chemical acids, and they have different chemical properties:
A monoprotic acid is an acid that contains only one hydroxyl group, while a diprotic acid contains two hydroxyl groups. This means that diprotic acids have twice the activity of a monoprotic acid.The titration curve of a monoprotic acid has only one equivalence point, but the titration curve of a diprotic acid has two equivalence points.Learn more about diprotic and monoprotic acids:
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What is the pH of a buffer made of 2. 00 M acetic acid CH3COOH and 2. 00 M sodium acetate NaCH3COO? [Hint: use the Henderson Hasselbalch Equation: PH = pKa + log [ base / acid ] ka of CH3COOH= 1. 8E-5 4. 74 5. 05 07. 98 6. 87 Question 6 (1 point) )Listen What is the molarity of LiOH if it is titrated against 50. 0 mL of 0. 200 M HNO3 and the end point was found to be at 40. 0 ml LiOH? [Hint: Set up first the balanced neutralization equation between the acid and the base]. A. 0. 187 M B. 0. 250 M C. 0. 215 M
A buffer solution containing 2.0 M acetic CH3COOH and 2.0 M of sodium acetate ion has a pH of 0.4ml.
What three kinds of buffer are there?
The caco3 acid buffer, the buffer ( ph, as well as the buffering of plasma make up your body's chemical buffer system. The first buffer is typically seen as being the most crucial since it is connected to the respiratory system, even though the second buffer is the most abundant.
What are buffer and pH with an example?
The pH of an acetic and sodium acetate solution in water is equivalent at 4.74. These solutions have a pH that is under seven. These solutions are made up of a salt of the a weak acid plus
Briefing:
To solve this the formula to use is
acetate=c1+v1/v2
Where c1 = 0.50 acetate ion
v1 = 8 ml of sodium acetate
v2 = 8 ml + 2 ml = 10 ml
When we out the values into the formula above we would have
= 0.5 x 0.8
= 0.4 M
The concentration of acetate ion in the buffer solution is equal to 0.4ml
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inner or terrestrial planet charecteristics
The characteristics of the terrestrial planet are:
They are made up of metallic substances with hard surfacesThe orbits of the terrestrial planets rotate more slowly Terrestrial planets also has mountains.What is meant by terrestrial planets?The terrestrial planets can simply be defined as those planets characterized by the presence of metallic substances, mountains or even rocks. However, the major known planets are as follows:
MecuryVenusEarthMars JupitarSaturnUranusNeptunePlutoThat being said, of all these planets listed above, only those ones closest to the sun are regarded to as the terrestrial or inner planets.
The terrestrial or the inner planets are as follows:
MecuryVenusEarthMarsIn conclusion, we can now deduce from all explanation given above that the inner planets are very close to the sun.
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how many grams of nh4cl can be dissolved in 100.0 ml of h2o at 10°c? at 100°c? you will need to extrapolate from the experimental curve (that is, extend the lines below and above the experimental segment).
We can get the solubility at temperatures from this experimental curve. we can find the solubility at 10∘C and 100∘C temperature. Hence, NH4Cl can be dissolved in 100 mL of H2O at 10∘C is 34g and at 100∘C is 75g.
Why is NH4Cl so easily dissolved in water?Answer and justification Salt made from ammonia and chlorine gas is known as ammonium chloride. It is a salt of strong acid (HCl) and weak base (NH4OH) (N H 4 O H). Although the process is endothermic, meaning it requires a temperature increase, the ammonium chloride salt is soluble in water.
What exactly do the terms saturated, unsaturated, and supersaturated mean?Saline Solution.a mixture in which the solute dissolves until it is no longer able to do so, leaving the undissolved components at the bottom. Solution without saturation. a solution that totally dissolves and leaves no residues (but contains less solute than the saturated solution). Solution with a high saturation.
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at what point in the lab was the tetra-n-butylammonium bromide, tbab, removed from the reaction mixture?
At 102°C - 106°C tetra-n-butylammonium bromide, tbab, is removed from the reaction mixture.
Facts about tetra-n-butylammonium bromide or TBAB
Crude solid suspension in warm hexanes removes the impurities from it and performing gravity filtration dries it.1H NMR spectra of starting material shows 4 benzene ring hydrogens at around 7 ppm. But in product spectra there are two benzene rings 5 hydrogen's peaks are present.TBAB is removed from the reaction mixture by dissolving the solid in Ethyl acetate and washing the organic layer with water to separate TBAB. After water wash dried the organic layer with anhydrous sodium sulfate and evaporate the organic layer under reduced pressure to get pure compound.Learn more about TBAB from the link given below.
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does clapeyron equation, in thermodynamics, help to determine the enthalpy of vaporization hfg at a given temperature from the p, v, t data alone?
The heat of vaporization or the vapor strain at any temperature.
Thermodynamics is a branch of physics that offers heat, paintings, and temperature, and their relation to electricity, entropy, and the bodily homes of being counted and radiation.
Thermodynamics is the study of the family members between warmth, paintings, temperature, and energy. The legal guidelines of thermodynamics describe how the power in a gadget changes and whether or not the gadget can carry out useful work in its environment.
Fourth law of thermodynamics the dissipative element of evolution is in a course of steepest entropy ascent. The zeroth regulation of thermodynamics was acknowledged earlier than regulation I of thermodynamics. motive.
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three disaccharides are important in the human diet: sucrose, lactose, and maltose. click and drag the monosaccharides to build each of the disaccharides below.
The monosaccharides to build each of the disaccharides are:
Glucose + fructose = sucrose
Galactose + glucose = lactose
glucose + glucose = maltose
What are monosaccharides examples?
The simplest carbohydrates, also called simple sugars, are plentiful in fruits. A monosaccharide is a carbohydrate consisting of one sugar unit.
What are the 4 monosaccharides?
Glucose is the most abundant monosaccharide. Galactose, mannose, fructose, and ribose are also of major biological importance.
What are the 3 disaccharides?
Disaccharides consist of two monosaccharide units, linked together with glycosidic bonds in the α or β orientation. The most important of them are sucrose, lactose, and maltose.
What are disaccharides and their functions?
Disaccharides act as an energy source for the body, just like any other carbohydrate. When we eat foods that contain disaccharides, our bodies break them down into simple sugars (monosaccharides) for absorption in the small intestine.
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how many times more energy comes from the nuclear reaction than the chemical reaction? if you did it right, this answer should be on the order of millions.
Compared to a typical chemical reaction, the energy released in this nuclear reaction is more than 100,000 times larger.
How much more energy is produced by nuclear reactions compared to chemical ones?
When compared to the energy produced by the interaction of atoms, the energy released by nuclei is a million times more dense (chemical reactions). This is what causes nuclear weapons to be so much more powerful and obliterative than conventional weapons.
Is nuclear power more powerful than chemical power?
Compared to the energies involved in chemical reactions, the energies produced in nuclear reactions are several orders of magnitude higher.
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write the balanced complete ionic equation for the reaction when cs₃po₄ and agno₃ are mixed in aqueous solution. if no reaction occurs, simply write only nr. be sure to include the proper phases for all species within the reaction.
The balanced complete ionic equation for the reaction between Cs₃PO₄ and AgNO₃ is:
Cs₃PO₄(aq) + 3Ag⁺(aq) + 3NO₃⁻(aq) → 3Ag₃PO₄(s) + 3NO₃⁻(aq) + 3Cs⁺(aq)
Ionic equations are defined as the balanced chemical equations that represent the species (ions or molecules) that are involved in a reaction.
In this reaction:
Cs₃PO₄(aq) + 3Ag⁺(aq) + 3NO₃⁻(aq) → 3Ag₃PO₄(s) + 3NO₃⁻(aq) + 3Cs⁺(aq)
Cs₃PO₄ (cesium phosphate) and AgNO₃ (silver nitrate) are mixed in aqueous solution. The cesium phosphate dissociates into its constituent ions, Cs⁺ and PO₄³⁻.
The silver nitrate dissociates into Ag⁺ and NO₃⁻ ions. The Ag⁺ ions react with the PO₄³⁻ ions to form solid silver phosphate (Ag₃PO₄), which is insoluble in water. The Cs⁺ and NO₃⁻ ions remain in solution.
Therefore, Cs₃PO₄(aq) + 3Ag⁺(aq) + 3NO₃⁻(aq) → 3Ag₃PO₄(s) + 3NO₃⁻(aq) + 3Cs⁺(aq) is the balanced complete ionic equation shows that a reaction takes place between cesium phosphate and silver nitrate to form solid silver phosphate and aqueous cesium and nitrate ions.
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How many molecules of magnesium oxide will form when excess magnesium reacts with 480 molecules of oxygen?
960 molecules of magnesium oxide will form when excess magnesium reacts with 480 molecules of oxygen.
What is mole?Wilhelm Ostwald, a German scientist, is widely credited with coining the term. Ultimately, though, the word mole derives from the Latin word moles, which meaning "a mass." The word molecule is connected to the word mole; it is a diminutive that means "a little bulk."
The quantity of matter in a system that equals the number of atoms in 0.012 kilograms of carbon-12; it is denoted by the symbol "mol".
Given that,
480 molecules of oxygen is there.
The equation becomes:
2Mg + O₂ → 2MgO
2 mol 1 mol 2 mol
Now,
1 molecule of oxygen give 2 molecule of MgO
480 molecule of oxygen will give (480 × 2) = 960 molecules of MgO
So, 960 molecules of magnesium oxide will form when excess magnesium reacts with 480 molecules of oxygen.
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When the halohydrin is treated with nah, a product of molecular formula c4h8o is formed. Draw the structure of the product and indicate its stereochemistry.
To make the leaving group and the nucleophile anti-periplanar to one another, the carbon-carbon bond is rotated. The epoxide is created by intramolecular SN2.
Examples of stereochemistry and what it is.The study of a molecule's three-dimensional structure is known as stereochemistry. The sole structural difference between the cis and trans isomers, which are types of stereoisomers, is where the atoms of the molecule are situated in three dimensions. These stereoisomers may differ in their chemical and physical characteristics.
What is stereochemistry in R and S?Stereocenters have a R or S designation: The enantiomers of a chiral substance are referred to by the terms "right hand" and "left hand" in naming.
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Draw the Lewis structure for the polyatomic carbonate (co} anion: Be sure to include all resonance structures that satisfy the octet rule ~ c_o]
The Lewis structure for polyatomic carbonate anion would be two oxygen atoms bonded with carbon atom with a single bond and one double bond is present.
There are three σ bonds and π bond around carbon atom in the Lewis structure of CO3^2- ion. According to the question caron has 4 valanced electrons. There are three oxygen atoms in CO32- ion,
Therefore,
Total valence electrons given by oxygen atoms = 6 *3 = 18
There are -2 charge on CO32- ion. Therefore, there are two more electrons which contribute to the valence electrons.
Total valence electrons = 4 + 18 + 2 = 24
Carbon has the more chance to be the center atom because carbon can show valance of 4. Oxygen's highest valence is 2. So, now we can build a sketch of CO3^2- ion.
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which set of quantum numbers cannot specify an orbital? which set of quantum numbers cannot specify an orbital? n
n=2,l=1,ml=1 n=3,l=2,ml=0 n=3,l=3,ml=2 n=4,l=2,ml=0.set of quantum numbers cannot specify an orbital.
a zone around a nucleus in an atom or molecule that can have 0–1–2 electrons, as stated theoretically. Around the nucleus, in structures known as orbitals, electrons arrange themselves into clouds. These orbitals are given numbers to represent their energy level and letters (s, p, d, and f) to represent their shape. S, P, D, and f are the four fundamental types of orbitals. Two electrons can fit into a s orbital, which is spherical in shape. There are three p orbitals, each of which is oriented differently in space but has the same fundamental geometry of a . Six electrons can fit in the p orbitals at once.
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what is the mole ratio of hydrogen perozide to permanaganate ion in the balanced chemical equation determined in question
Five molecules of hydrogen peroxide to two molecules of permanganate make up the mole ratio. Using the ratio, 0.0045 moles of potassium permanganate oxidised 0.005625 moles.
Materials
Distilled or deionized water, 100 mL
Hydrogen peroxide, H202, commercial antiseptic solution, 3 mL
Potassium permanganate solution, KMn04, 0.025 M, 75 mL
Sulfuric acid solution, H2SO4, 3 M, 30 mL
Beaker, I 00-or 150-mL
Buret, 50-mL, with buret clamp
Graduated cylinder, 10-or 25-mL
Labels and/or markers
Pipet, serological, 1-mL
Pipet bulb
Ring stand
Wash bottle
Waste disposal beaker, 250-mL
Erlenmeyer flask, 125-mL
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balance the following redox reaction if it occurs in acidic solution. what are the coefficients in front of ni and h+ in the balanced reaction? ni2+(aq) + nh4+(aq) → ni(s) + no3-(aq) balance the following redox reaction if it occurs in acidic solution. what are the coefficients in front of ni and h+ in the balanced reaction? ni2+(aq) + nh4+(aq) → ni(s) + no3-(aq) ni = 4, h+ = 10 ni = 2, h+ = 4 ni = 1, h+ = 8 ni = 1, h+ = 4 ni = 3, h+ = 5
The coefficients before Ni and H+ are 4 and 10 respectively.
A coefficient is an integer that is written or multiplied by a variable. A quantitative value multiplies variables and can change depending on other variables or covariates. Function coefficients are different from other coefficients in that they are constant across all entities or participants, while others can vary.
Coefficients are multiplicative coefficients in terms of a polynomial series, or expression. Usually numeric, but can be any expression. If the coefficients themselves are variables they can also be called parameters. Circle the variable with the power of the coefficient you found. Leave that variable and consider any other number or variable written to it. that will be the coefficient.
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What kind of energy can travel through empty space without being carried in or by any matter?
A.
sound
B.
mechanical
C.
light
D.
all of these
The energy can travel through empty space without being carried in or by any matter is light.
What is light?
light is an electromagnetic wave and it can travel through a vacuum such as the empty parts of outer space. electromagnetic wave means it has both the proprties of electric field and magnetic field. In a model, a changing electric field creates a changing magnetic field. This changing magnetic field then creates a changing electric field and light.
What is the travelling speed of light?
In empty space, light travels at a speed of about 300,000 km/s. It does not require any substance or material to transport its energy. This means that light can pass across a vacuum—a place devoid of any air.
The energy can travel through empty space without being carried in or by any matter is light.
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a compound that has 5 electron groups, 4 bonding pairs and 1 lone pair is considered to have a molecular geometry.
The compound will show pentagonal pyramidal structure.
This is because the one axial plane is occupied by the lone pair of electrons obeying the bent's rule . And the other 4 bond pairs are present in both equatorial and the axial position. Since a lone pair of electrons are present they represent pentagonal bipyramidal structure to pentagonal pyramidal structure.
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Which number on the periodic table of element i the ame a the number of protron and electron of the atom
The atomic number of gold is 79. The correct response for an atom on the periodic table with the same number of protons and electrons is gold, which has 79 protons and 79 electrons.
What is protron?Every atom has a proton in its nucleus, a subatomic particle. The particle has a positive electrical charge that is the antithesis of the electron's. If a proton were isolated, it would weigh only 1.673? 10-27 kilogrammes, little less than a neutron. A stable subatomic particle known as a proton with an electric charge of +1 e and the symbols p, H+, or 1H+. Its mass is only marginally less than that of a neutron and 1836 times greater than that of an electron.
What does a proton or neutron look like?Silicon has 14 protons and 14 neutrons, for instance. It weighs 28 kilogrammes and has an atomic number of 14. Uranium's most prevalent isotope contains 146 neutrons and 92 protons. It has an atomic mass of 238 thanks to its 92 protons and 146 electrons.
Briefing:The atomic number refers to the total number of protons in the nucleus of an atom. The atomic numbers of the elements are used by the Periodic Table to divide them into groupings.
The Periodic Table is used to find an element's atomic number. The atomic number is visible in the top left corner.
For instance, krypton has an atomic number of 36. This reveals that the nucleus of a krypton atom contains 36 protons.
Atoms are not electrically charged by nature. The protons' positive charges and the electrons' negative charges must be equal.
Protons and electrons must be present in an equal number in an atom. In our example, an atom of krypton needs to have 36 protons in addition to 36 electrons.
For any component:
Atomic number = number of protons + number of electrons
Hence, as an illustration of glod:
The atomic number of gold is 79. Gold therefore contains 79 protons and 79 electrons.
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at a given temperature, the vapor pressures of hexane and toluene are 183 mm hg and 59.2 mm hg, respectively. calculate the total vapor pressure over a solution of hexane and toluene. the mole fraction of hexane (x hexane) is 0.520.
Answer:
total of 131 millimeters of mercury
Explanation:
So we can calculate the total vapour pressure using the equation. The total pressure p equals x a where x is the mole fraction of a and the p a is the partial pressure of a plus x b being the mule fraction of b and the partial pressure of b we can get the mule fraction of a and B because 1 will equal x, a plus x b and a is hexane and b is octane, and so the mole fraction of hexane is 1.580, and so we can set this up to solve. As x b will equal 1 minus x a which is equal to 1 minus .58, which is equal to .4 2 point now, because we have all our numbers, we can put them into our full equation. So we have. The pressure is equal to .58 times. The pressure of our hexane, which is greater than 183, and this has added 2.42 and the pressure of our octane, which is 59.2, and so we get a total of 131 millimeters of mercury. As our total vapour pressure.
answer is in th epic
what is the approximate mole fraction of ethanol, c2h5oh, in an aqueous solution in which the ethanol concentration is 11.0 molal?
The mole fraction of ethanol is 0.165
What do you mean by mole fraction ?
There are several ways to indicate the concentration of the solution and mole fraction is one of them. Mole fraction is a unit of concentration. In the solution, the relative amount of solute and solvents are measured by the mole fraction and it is represented by “X.”
The mole fraction is the number of moles of a specific component in the solution divided by the total number of moles in the given solution.
Molecular Mass of Ethanol = 46g
11.0 molal = 11 moles in 1 L solution
Molecular mass of water = 18g
Density of water= 1kg/m3 = 1000g/l
So, Mass of water in 1l solution = 1000g
so moles = 1000/18 = 55.55 moles
Thus, mole fraction of ethanol = 11.0/ ( 11.0 + 55.6 ) = 0.165
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when 11.8 g of c8h18 underwent a combustion reaction with 8.84 g of o2, it produced 1.15 g of h2o. balance the reaction and answer the following questions. what is the mass (in g) of remaining oxygen gas?
It is given that its a combustion reaction, we know that the ending compounds are CO2 and H2O alone. To get this, we add O2 in a combustion reaction to our initial compound.
C8H18 + O2 ---> CO2 + H2O ( + trace amounts of C8H18 left) We are asked about the C8H18 left meaning we have a limiting reactant and it is not completely water and CO2 left due to the limiting reagent. So we are trying to find the excess reactant.
To balance the equation we must balance all molecules ;
2 C8H18 + 25 O2 ---> 16 CO2 + 18 H2O (not taking into account the combustion of air)
It is given that it is incomplete combustion so we must use the grams of product to calculate the amount of reactant used due to the limiting reagent
1.15 g H2O * ( 1 mol H2O / 18.01532 g H2O) *( 2 mol C8H18 / 18 mol H2O) * ( 1 mol C8H18 / 114.24 g C8H18) = 0.00111755 = 0.00118 g C8H18 reacted
11.8 g C8H18 in the initial reaction, 0.0118 g reacted to get 1.15 g H2O
11.8-0.00118 = 11.79882 = 11.8 g C8H18 left in the balanced equation (meaning almost none of it was reacted)
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what is the concentration, in mass %, of a solution made by mixing 42.79 g of nacl with 285.9 ml of water?
The grams of solute in 100 grams of solution are indicated by the percentage mass by mass. We use the density formula to convert the ml of water to g.
Definition of density
Density definition Density is the measurement of how tightly a substance is packed. It has such definition since it is the mass per unit volume. Indicator of density: D or Density Formula: The formula is: = m/V where is the density, m is the object's mass, and V is its volume.
What does density, for example, mean?
Anything's density determines how compact or concentrated it is. Consider two boxes as an example, one large and one small. But their combined weight is the same. This suggests that the tiny box is denser than the enormous box. Density
Briefing:
The percentage mass by mass indicates the grams of solute in 100 grams of solution. We convert the ml of water into g from the density formula:
δ= m/v m=δx v= 1 g/ml x 285.9 ml = 115 g
42.79 g solution-----29 g NaCl
100g solution----x=(100g solutionx29 g NaCl)/115g solution
x=25,2173913 g NaCl
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Once a peptide has been formed between the amino acid attached to the trna in the p site and the amino acid associated with the trna in the a site, which process on the list occurs next?.
The complex known as RIBOSOME, which is made up of enzymes and ribosomal RNA, is where translocation peptide has indeed been generated.
What age is the ideal time to begin taking peptides?
Since collagen production normally slows down in your mid-20s to early-30s, I advise incorporating a peptide into your skincare regimen about this time. But regardless of your age, incorporating a peptide into your skincare regimen will make your skin look younger.
Peptide vs. protein: what are they?
In general, small chains of more than two amino acids are referred to as peptides. Proteins, commonly known as polypeptides, are lengthy molecules comprised of many peptide subunits. Enzymes (other proteins) can break down proteins into little peptide fragments.
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