The empirical formula of the sample is KCrO₄
Given that :
Potassium , K = 2.087 g
molar mass of potassium = 36 g/mol
Chromium , Cr = 2.775 g
molar mass of chromium = 52 g/mol
Oxygen , O = 2.988 g
molar mass of oxygen = 16 g/mol
the number of moles of potassium = mass / molar mass
= 2.087 / 36
= 0.05 mol
the number of mole of chromium = mass / molar mass
= 2.775 / 52
= 0.05 mol
the number of moles of oxygen = mass / molar mass
= 2.988 / 16
= 0.18 mol
now diving by the smallest number, we get
moles of K = 1
moles of Ce = 1
moles of O = 4
the empirical formula for the sample is KCrO₄
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I need help what is the answer
Neon is a Noble Gas (Group 18), so it would have 8 valence electrons. The valence electrons determine its recativity, so you will need to find the model with around 8 valence e-.
Model W and model Y
q17 (1pts) write a lewis structure for so3 that expands the octet to minimize formal charge and if necessary places negative formal charges on the most electronegative atom(s).
Having the chemical formula SO3, sulphur trioxide is a substance. Due to its reaction with the airborne water to form sulfuric acid, this substance is very significant and extensively studied.
Acid rain is what happens when this sulfuric acid, which is a gas, mixes with rain and falls to the ground. Sulphur trioxide is typically colourless and lubricious yet has a strong corrosive tendency. Additionally chemical formula known as battery acid, it is employed in the production of acids, fertilizers, lead-acid batteries, the pickling of metal, the purifying of petroleum, and other processes. The Lewis structure of sulphur trioxide , also known as an electron dot structure, establishes the quantity of valence electrons in an atom. chemical formula , they explain the role that these valence electrons play in the process.
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give the oxidation number of chlorine in each of the following substances: nacl mgcl2 cl2 ocl2 clo3 - clf naclo
The oxidation state of chlorine in each of the following substance : NaCl, [tex]MgCl_{2}[/tex], [tex]Cl_{2}[/tex], [tex]OCl_{2}[/tex], [tex]ClO_{3}[/tex], Clf and NaClO are -1,-1,0,+1,+6,+1 and +1 respectively.
NaCl
The oxidation state of Na is +1 as it belongs to alkali metal group 1 substituting it to get the oxidation state of chlorine:
(1)+Cl= 0
Cl= -1
[tex]MgCl_{2}[/tex]
The oxidation state of magnesium is +2 as it belongs to group 2 alkaline earth metal substituting it to get oxidation of chlorine:
(+2)+2Cl=0
2Cl=-2
Cl =-2/2
Cl= -1
[tex]Cl_{2}[/tex]
As it is in the elemental state
= 0
[tex]OCl_{2}[/tex]
The oxidation state of oxygen is -2 substituting it to get oxidation state of chlorine:
(-2)+2Cl=0
2Cl= +2
Cl= 1
[tex]ClO_{3}[/tex]
Cl +3(-2)=0
Cl -6=0
Cl= +6
Clf
the oxidation state of fluorine(f) is -1 as it is from halogen group. Both chlorine and fluorine belong to same group and have same property but as fluorine is more reactive than chlorine oxidation state of fluorine is -1.
Cl-1=0
Cl=1
NaClO
(+1)+Cl(-2)=0
Cl -1=0
Cl= +1
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gaseous ethane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . suppose 8.12 g of ethane is mixed with 13. g of oxygen. calculate the maximum mass of carbon dioxide that could be produced by the chemical reaction. be sure your answer has the correct number of significant digits.
Ethane is the limiting reactant, so no mass of ethane will be left over by the chemical reaction. All the mass will react, the 8.1 grams of ethane.
How much grams of ethane will react, explain.
First of all, we need to determine the reaction and the limiting reactant to work with the stoichiometry.
The equation is: 2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O
We define the moles of the reactants:
8.12 g / 30 g/mol = 0.270 moles of ethane
13g / 32 g/mol = 0.406 moles of oxygen
To determine the limiting reactant, we start with oxygen:
7 moles of O₂ can react with 2 moles of ethane
Then, 0.406 moles of O₂ will react with (0.406 . 2) / 7= 0.116 moles of ethane.
We do not have enough ethane, just only 0.07 moles to react.
Ethane is the limiting reactant, so no mass of ethane will be left over by the chemical reaction. All the mass will react, the 8.12grams of ethane.
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determine the limiting reactant when 2.0 moles of fe and 6.0 moles of o2 are added to the chemical reactor.
When 2.0 moles of Fe and 6.0 moles of O₂ are added in a chemical reactor, the limiting reactant between Fe and O₂ is Fe.
Limiting reactant is defined as the reactant which is present in less quantity than the required. It limits or restricts the yield of a reaction before other reactants are completely used in a reaction. The other reactant is known as excess reactant.
The balanced reaction between Fe and O₂ is given as
4Fe+3O₂→2Fe₂O₃
To find out limiting reactant, we need to find out moles of Fe₂O₃ using moles of Fe and O₂. The mol to mol ratio between Fe and Fe₂O₃ is 4:2 or 2:1. Hence, moles of Fe₂O₃ formed is
2.0 mol Fe×(1 mol Fe₂O₃/2 mol Fe)
=1 mol Fe₂O₃
The mol to mol ratio between O₂ and Fe₂O₃ is 3:2. Hence, moles of Fe₂O₃ formed is
6.0 mol O₂×(2 mol Fe₂O₃/3 mol O₂)
=(6.0×2 mol Fe₂O₃/3)
=12.0 mol Fe₂O₃/3
=4.0 mol Fe₂O₃
Since Fe forms the less moles of Fe₂O₃. Hence, the limiting reactant is Fe.
Therefore, when 2.0 moles of Fe and 6.0 moles of O₂ are added in a chemical reactor, the limiting reactant between Fe and O₂ is Fe.
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which region of a titration could you use the henderson-hasselbalch equation to determine the ph? group of answer choices
Region B of the titration curve can be used to determine the pH
Henderson-hasselbalch equation is mostly used for buffer solutions. Buffer solutions are the solutions of weak acids and their salts, for example, the mixture of acetic acid and sodium acetate will act as a buffer solution. The major role of buffer solution is to resist the change in pH.
So it is clear that buffer solutions have an acid and a conjugate base, so region B can represent the pH. Region A of the titration curve represents the acid solution, region C represents the endpoint. While the other two regions are out of the system.
Complete question: (Graph is attached as a picture)
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Which of the following BEST accounts for the charge in potential energy going from Point B to Point A?As the atoms get closer together, their nuclei begin to repel one another,As the atoms get closer together, the attraction of the nucleus of each atom for the electron(s) of the other gets stronger and stronger,As the molecules get closer, they slow down, converting kinetic to potential energy,The bond is becoming stronger as the atoms approach each other.
The statement which accounts for the change in potential energy going from Point B to Point A is that as the atoms get closer together, the attraction of the nucleus of each atom for the electron(s) of the other gets stronger and stronger and is denoted as option B.
What is Potential energy?This is referred to as the energy possessed by a body by virtue of its position.
The change in the potential energy is as a result of the atoms getting closer which leads to the attraction of the nucleus of the electron of the other getting stronger.
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suppose you have an avogadro's number of potassium atoms. how many grams does this represent? report your answer to two decimal places.
The potassium atom represents 39.1 g grams.
Give a brief idea about Potassium.The chemical element potassium has the atomic number 19 and the letter K (which stands for kalium in Neo-Latin). Potassium is a silvery-white metal that may be easily and gently sliced with a knife. Within seconds of exposure, potassium metal quickly combines with air oxygen to produce flaky, white potassium peroxide. It was initially separated from potash, which is made up of plant ashes and from which it gets its name. Potassium is an alkali metal in the periodic table. All alkali metals have a single valence electron in the outer electron shell, which can be removed easily to produce a positive-charged ion called a cation, which interacts with anions to form salts. Only ionic salts include potassium in nature. Potassium interacts vehemently with water, producing enough heat to ignite the hydrogen released during the reaction and producing a flame that is purple in color. It is found in numerous minerals, including orthoclase, a common component of granites and other igneous rocks, and is dissolved in seawater, which contains 0.04% potassium by weight.
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Never mind I don't need help, don't know how to take this down though
Answer:
................................ ..............
HELP!!! WILL MARK BRAINLIEST!!!
Identify on the slide at least 2 reactions create a red or yellow product. (Write the reaction this way: Na2SO4 + AgNO3 using the compound on the left of the chart + the compound on the top of the chart).
Which ion do all of the red and yellow reactions have in common? Drag that ion from the list onto the board.
1. List at least two chemical reactions that resulted in a yellow, orange, or red precipitate.
2. The ion that all of the red and yellow reactions have in common is (drag from the list):
Answer:
Explanation:Silver nitrate, AgNO3 , will react with sodium sulfate, Na2SO4 , to produce silver sulfate, Ag2SO4 , an ionic compound that is considered insoluble in aqueous solution, and aqueous sodium nitrate.
Does it matter where you put the dots on a lewis symbol?
Answer:
it does not matter
Explanation:
g
Answer:
It doesn't matter
Explanation:
In almost all cases, chemical bonds are formed by interactions of valence electrons in atoms. To facilitate our understanding of how valence electrons interact, a simple way of representing those valence electrons would be useful. Again, it does not matter on which sides of the symbol the electron dots are positioned.
what volume (in ml) of 0.500 m naoh is required to neutralize 2.32 g of hno3? enter the number only, not units
NaOH is a mono base, whereas HCl is a mono acid. Therefore, 1 mole of NaOH is required to neutralize 1 mole of HCl.
Here, we will determine how much H 2 S O 4 is necessary to neutralize 60.2 mL of a 0.427 M KOH solution. As a result, 0.01285 moles of H 2 S O 4 are required to neutralize the KOH in the provided quantity. The number of moles per litre is the molarity of a solution. In 500 ml, you have 0.75 moles. As a result, you have 0.75 moles per liter, or 1.5 moles per liter, or one pound. vwX30 = 0.015 mol 1000 in 30 mL of 0.5 M H2SO4 500 mL is equal to 0.500 L of diluted solution because 30 mL of 0.5 M.
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liquid octane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . suppose 9.1 g of octane is mixed with 41.9 g of oxygen. calculate the minimum mass of octane that could be left over by the chemical reaction. be sure your answer has the correct number of significant digits.
The minimum mass of octane that could be left is 2.8gm.
When octane reacts is burned in the air, it chemically reacts with oxygen gas to produce carbon dioxide and water.
C8H18 + 5O2 = 8CO2 + 9H20
Octane is a hydrocarbon and alkane with the chemical formula C8H18, and the condensed structural formula is CH3(CH2)6 CH3. Octane has many structural isomers that differ by the amount and location of branching in the carbon chain. One of these isomers 2,2,4 trimethylpentane commonly called iso octane is used as one of the standard values in the octane rating scale.
Octane is a component of Gasoline (petrol). As with all low molecular weight hydrocarbons octane is volatile and very flammable.
Octane is colloquially used as a short form of octane rating, particularly in the expression high octane. The octane rating was originally determined by mixing fuels from only normal heptane and iso octane.
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How many particles are in one mole?
О А.
OB. 2.066 x 1023
O C.
6.022 x 1023
O D.
6.023 × 1022
1022
3.026 x
Answer:
I think it's C. 6.022 * 1023
which of the following is not being considered as an energy source for the future? a. methanol b. shale oil c. carbon dioxide d. ethanol e. seed oil
shale oil is used as an energy source and is considered to be the future energy source
what is shale oil?
Oil shale is a sedimentary rock. As it reaches its oil window, oil shale releases a liquid known as shale oil. Oil shale is the rock from which shale oil is extracted. Shale oil is similar to petroleum, and can be refined into many different substances, including diesel fuel, gasoline, and liquid petroleum gas (LPG).The difference between shale oil and crude oil comes down to how it is extracted. Because shale oil is bound up tightly in impermeable rock, it is considered tight oil and requires hydraulic fracturing to be extracted. Crude oil can be drilled out conventionally.Shale oil is a substitute for conventional crude oil; however, extracting shale oil is costlier than the production of conventional crude oil both financially and in terms of its environmental impact.Russia has the biggest shale oil reserves in the world. But in terms of shale gas reserves, America is not the biggest shale oil reserve holder. The biggest shale gas reserve holder, on the other hand, is China.Although the quality of raw shale oil is low, the enormous amount of oil shale available in the world positions shale oil as a significant resource for future production of fuels and chemicals. This chapter deals with the production and upgrading of shale oils produced from retorting technologies.to know more about shale oil follow
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PLEASE HELP ME
A sealed tube containing the equilibrium mixture is placed in ice-cold water. There is an increase in the
amount of yellow solid in the equilibrium mixture. What can you deduce about the forward reaction
in this equilibrium?
Explain your deduction.
ICI(1) + CL(g) ICI,(s)
ICI(1) + CL(g) ICI,(s) is an endothermic reaction.
What is the classification of chemical reaction?Any transition from a more ordered to a less ordered state (solid to liquid, liquid to gas, or solid to gas),in which r energy, is used referred to as an endothermic reaction. Likewise, any transition from a less ordered to a more ordered state (liquid to solid, gas to liquid, or gas to solid), which releases energy, is referred to as an exothermic reaction
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Why is electron filling similar to going up the stairs?.
If we look into the Bohr's atomic model, it is like a staircase.
Where every next orbit is like a stair.
As we can not rest in air, we either have to stay on level 1 or can go up with enough energy to climb next level.
Same way, electron can either stay on one orbit or can go to higher orbits with enough energy to jump from lower energy level to the higher energy level, can say orbit.
According to Bohr, atom is a system consisting of a dense nucleus surrounded by orbiting electrons.
He compared his atomic structure with the structure of the Solar System.
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Palmitoyl-coa is a saturated, 16-carbon long fatty acid. How many acetyl-coa, nadh and fadh2 will be formed from the full oxidation of this molecule?.
Thus, a total of 8 acetyl-CoA, 7 NADH, and 7 FADH2 molecules are produced.
The beta oxidation of a 16 carbon fatty acid produces how many molecules of NADH?
The fatty acid with the most common structure, palmitic acid, has sixteen carbon atoms but no carbon-carbon double bonds. A total of seven cycles of beta oxidation are required to fully degrade the fatty acid. Thus, a total of 8 acetyl-CoA, 7 NADH, and 7 FADH2 molecules are produced.
A 30 C saturated fatty acid will provide how many acetyl-CoA molecules?
A fatty acid with 30 carbons makes up the molecule. It will result in 15 Acetyl CoA molecules because it is a 30-carbon fatty acid.
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COOKING CLASS!
Copy and paste three recipes you would use for the Thanksgiving Holidays. Double and a half each recipe creating a new recipe, thereby changing the yield for each recipe. You will end up with nine recipes, giving you three of each recipe with different quantities and different yields.
A recipe's total yield is determined by multiplying the number of servings by the size of each serving. Multiply the new number of servings by the new size of each serving to determine the desired yield for the recipe.
Divide the desired yield by the original yield to obtain the conversion factor and multiply each component by the conversion factor. A standardized recipe is one that has been tried, tested, evaluated, and adjusted for use in school lunches. Consistent quality and yields are obtained every time the correct processes, equipment, and raw materials are used.
Recipes may be copyrighted if they involve substantial literary expression. This phrase may be a description or detailed instructions. This is why food and recipe bloggers often share stories and personal anecdotes alongside their recipe ingredients. Food is one of the most difficult things to trademark or copyright. Trademarks can be protected or copyrighted, but their content cannot be protected.
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explain why it is the freezing point depression of a solvent does depend on the concentration of the solute.
The reason why the freezing point depression of a solvent depends on the concentration, it is because the solute occupies space between the solvent molecules.
The freezing point depression of a solvent depends on the concentration of the soluteThe freezing point depression of a solvent does depend on the concentration of the solute because the solute occupies space between the solvent molecules, thus reducing the number of molecules that can interact.
When a solute is dissolved in a solvent, it takes up space between the solvent molecules. This reduces the number of molecules that can interact, and thus lowers the freezing point of the solvent. The more concentrated the solution, the greater the effect on the freezing point.
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Which term describes the amount of solute that will dissolve in a specific solvent
under given conditions?
solution
Molarity
mass percent
solubility
the activity of an isotope of erbium of falls from 500, b, q,500bq to 125, b, q,125bq in just 20, h, o, u, r, s,20hours. what is its half-life?
The half-life = 10hrs.
Solution:
We know, activity after 'n' half-lives R=RO (1/2)n
125= 500 (1/2) n
= (1/2)n = (125/500) = 1/4 = (1/2)
n = 2
now,
nty2 = 20 hrs
2ty₂ = 20 hrs
ty₂ = 10 hrs
∴ half-life = 10 hrs
Half-life is the time it takes a given amount of a radioactive element to decay to half its original value. This also means that half-life is the time it takes for the activity of a source to decay to half its original value. Become. Isotope half-life is used to describe the rate at which the isotope decays and emits radiation. Half-life can be used to predict the amount of radioactive material remaining after a certain period of time.
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Give 3 descriptions of the graph of accelerated motion
For the graph of accelerated motion;
a) The graph begins at origin
c) The slope is positive
d) The line of best fit moves upwards.
What is motion?We define motion as the change in the position of an object with time. Now we know that an object has moved if in a given time interval we can see that the position of the object changed. That is, the object is no longer where it was.
As the object is moving it has to move with a given velocity because velocity is defined as the change in the displacement of an object with time. As the velocity of the object is changing we say that the body is accelerating.
The acceleration is the rate of change of the velocity with time and if the velocity changes by equal amounts in equal time intervals, we say that this is a uniform acceleration.
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Which of these pairs of elements is most likely to be part of a polyatomic ion?
I and I?
S and O?
or K and F.
The pairs of elements that is most likely to be part of a polyatomic ion is option B: S and O.
What is polyatomic ion?An ion made up of two or more atoms that really combine covalently is referred to as a polyatomic ion. This implies that only non-metals can link covalently with one another since a covalent bond is created when electrons are shared.
S and O atoms, for instance, have a covalent bond and frequently combine to produce polyatomic ions. K and F, Li and I, Mg and Br, on the other hand, are both metals and non-metals. Therefore, because the metal will donate its valence electrons to the non-metal, they will always establish an ionic bond.
As a result, we can draw the conclusion that, among the possibilities provided, S and O pairs of elements are most likely to make up a polyatomic ion.
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if the pka of hcho2 is 3.74 and the ph of an hcho2/nacho2 solution is 3.11, which of the following is true?
More than the pKa, the pH exists. The information is provided as HCHO2 pKa = 3.74 and pH = 3.89 (HCHO2/NaCHO2). The strength of the acid increases with decreasing pKa value.
How does pKa work?The pKa value describes the acidity of a molecule. The strength of an acid is determined by the proton's grip on a Bronsted acid. With falling pKa values, the acid becomes more potent and has a greater ability to donate protons.
Is pKa the same as pH?The pH scale is expressed as the product of the pKa value and the log of the conjugate base concentration divided by the weak acid concentration.
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Which is generally stronger, intermolecular interactions or intramolecular interactions?.
Intramolecular interactions are generally stronger.
Intermolecular interactions are one or two orders of magnitude weaker than intramolecular interactions, which are real bonds in which electrons are obtained, lost, or shared.
Chemical bonds including ionic, covalent, and metallic bonds are instances of intramolecular forces. The chemical bonds that hold the atoms in molecules together are known as intramolecular forces. The metallic bond, the ionic bond, and the covalent bond are the three main categories of chemical bonding.
Intramolecular bonds can be classified as covalent, ionic, or metallic. A covalent bond is one in which two atoms share a pair or pair of electrons. Covalently bound species with low molecular masses are referred to as molecules in compounds.
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what term describes a catalytic converter as it reaches its effective temperature? group of answer choices light off trigger combustion absorption
Light off describes a catalytic converter as it reaches its effective temperature.
The lowest temperature required to start a catalytic reaction is known as the catalyst light-off. The aforementioned definition is not very precise because of the reaction rate's steady growth. The temperature at which conversion reaches 50% is referred to as the light-off temperature.
Between 400 and 600F is the usual light-off temperature at which a catalytic converter begins to function. The usual operating temperature is from 1,200 to 1,600 degrees Fahrenheit. On the other hand, as the amount of toxic gas in the exhaust pipe rises, so does the operating temperature. The converter doesn't have to exert a lot of effort to complete its tasks.
With unleaded gas, catalytic converters operate as intended because lead in regular gas is poisonous to the catalyst and prevents it from capturing pollutants in vent fumes.
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8. There are 75 Btu. If you need to convert the Btu to Joules, what number would you use to multiple the Btu by?
A.1.055
B.100,055
C.10,055
D.1,055
Leandra is learning about chemical reactions and she wants to examine the information that is included in a chemical equation. Which pieces of information does a chemical equation include? choose the three that apply.
The correct answers are (A).The type of atoms that form during a reaction. (C). the kind of substances that go into a molecule. (D). if the molecules are reactants or products.
What is chemical equation?A chemical equation can offer information about the types of atoms that are produced during a reaction, the types of elements that make up molecules, and the types of molecules that are reactants or products.
We can therefore draw the conclusion that chemical equation provides us with useful and significant information about elements. Chemical equation also informs us about the number of atoms involved in the chemical reaction as well as the quantity or concentration of products produced at the end of the chemical reaction.
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Complete question is "Leandra is learning about chemical reactions and she wants to examine the information that is included in a chemical equation. Which pieces of information does a chemical equation include? Choose the three that apply. A. the kinds of atoms that form during a reaction B. the kinds of molecules involved in the reaction C. the kinds of elements that make up a molecule D. whether the molecules are products or reactants E. whether the products have more mass than the reactants".
the density of a 20.0% by mass ethylene glycol (c2h6o2) solution in water is 1.03 g/ml. find the molarity of the solution.
The density of a 20.0% by mass ethylene glycol ([tex]C_{2} H_{6} O_{2}[/tex]) solution in water is 1.03 g/ml. the molarity of the solution is 16.58 M
Describe density.A substance's density is defined as its mass per unit volume.
[tex]D=\frac{m}{v}[/tex]
where,
D=density
m= mass
v= volume
MolarityMole concentration per liter of solution is known as molarity.
Let us find the molarity of a solutionLet's assume that the solution weighs 100 grams. Ethylene glycol's mass would thus be 20.0 grams.
Ethylene glycol has a molar mass of 62.07 grams per mol.
mole = [tex]\frac{given mass }{ molar mass}[/tex]
= [tex]\frac{20.0}{62.07}[/tex] =0.322 g
We determine the volume of the solution and convert it to liters using the formulas:
D= m/ v
v= m/D
v= [tex]\frac{20.0}{1.03}[/tex] = 19.41 mL
Molarity =[tex]\frac{no. of moles }{volume ( L)}[/tex]
= [tex]\frac{0.322}{19.41} * 1000[/tex]
=16.58 M
so, the molarity of the solution is 16.58 M
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