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CHEM 103 Exam 2 Prep Test Questions And All Correct Answers.
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What is a chemical formula? - Answer a combination of symbols of the various elements that make up the compound Define Molar Mass - Answer The sum of atomic masses, based on chemical formula What are the units of Molar Mass (MM) - Answer Grams/Mole (g/mol) Number of moles can be foun...

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  • October 11, 2024
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  • 2024/2025
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CHEM 103 Exam 2 Prep Test Questions
And All Correct Answers.
What is a chemical formula? - Answer a combination of symbols of the various elements that make up
the compound



Define Molar Mass - Answer The sum of atomic masses, based on chemical formula



What are the units of Molar Mass (MM) - Answer Grams/Mole (g/mol)



Number of moles can be found by - Answer a. Atoms of an element

b. Molecules of a molecular compound



One Mole equals ? - Answer Avogardo's number =

6.022 x 10^23 atoms/molecules



How do you calculate molecules and atoms - Answer find moles first, then use Avogadro's number



what does a chemical equation show? - Answer A chemical equation shows the molar quantity of
reactants needed to produce a particular molar quantity of products



chemical equations are a shorthand to - Answer describe a chemical reaction



what may you never change about a reaction - Answer the subscripts can never be changed!



elemental forms - Answer the way that elements are found in nature



diatomic gases - Answer H2, N2, O2, F2, Cl2, Br2, I2

, stoichiometry - Answer process for calculating amounts in a chemical reaction



first two steps of stoichiometry - Answer 1. balanced equation for the reaction

2. convert the given compound from grams to moles

(divided by MM of given compound)



last two steps of stoichiometry - Answer 3. Convert moles given compound to moles answer compound
using the stoichiometric ratio

4. convert moles of answer compound to grams (multiply by MM of answer compound)



How many moles of SF6 contain 8.58x10^31 molecules of Sf6? - Answer 1.43 x 10^8



How many moles of N are in 0.247 g of N2O - Answer 1.12 x 10 ^ -2



How many atoms of magnesium are present in 87.2 mol of magnesium? - Answer 5.25 x 10^25



How many atoms are in 179g of calcium? - Answer 2.69 x 10^ 24



Consider the following reaction:

How many moles of K3 PO4 react to produce 9.09 mol of Mg3 (PO4)2? Assume MgCl2 is present in
excess - Answer 18.2 mol K3 PO4



Calculate the number of atoms in a 9.16x10 ^3 g sample of boron - Answer 5.10 x 10^26



how many molecules are in 0.819 moles of H2O? - Answer 4.93x10^23



What is the difference between gas, liquids, and solids? - Answer A solid has definite volume and shape,
a liquid has a definite volume but no definite shape, and a gas has neither volume nor shape.



Using the Periodic Table determine the mass of one atom of the following elements:

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