Mole Review

Molar Mass

100

Calculate the Molar Mass of H₂O

18.015 g/mol

200

Calculate the molar mass of MgCl₂

95.211 g/mol

300

Calculate the molar mass of glucose

180.156 g/mol

400

Calculate the molar mass of Potassium Nitride

131.3g/mol

500

Calculate the molar mass of Lead (IV) Sulfate

399.32g/mol

Mole Calculations

100

What is the number of moles of H₂O₂ in a 100.-gram sample of H₂O₂ (gram-formula mass = 34 g/mol)?

2.9 mol

200

What is the number of moles in a 78.8-gram sample of MgCO₃ (gram-formula mass = 84.3 g/mol)?

0.935 mol

300

Convert 2.00 moles of Neon gas to liters.

44.8 L

400

What is the total number of neon atoms contained in 20.2 grams of neon gas?

6.02x10²³ atoms

500

What is the total volume occupied by 132 grams of CO₂(g) at STP? (gram-formula mass=44 g/mol)

67.2 L

Percent Composition

100

What is the percent composition by mass of nitrogen in the compound N₂H₄ (gram-formula mass = 32 g/mol)?

88%

200

What is the percent by mass of oxygen in H₂SO₄? [formula mass = 98]

65%

300

What is the percent composition by mass of aluminum in Al₂(SO₄)₃ (gram-formula mass = 342 grams/mole)?

15.8%

400

What is the percent composition by mass of nitrogen in NH₄NO₃ (gram-formula mass = 80.0 grams/mole)?

35.0%

500

What is the percent by mass of oxygen in propanal, CH₃CH₂CHO?

27.6%

Empirical Formula/Molecular Formulas

100

This is the simplest whole number ratio of elements in a compound?

Empirical Formula

200

What is the empirical formula for ethane, C₂H₆?

CH₃

300

What is the empirical formula for a compound with the molecular formula C₆H₁₂Cl₂O₂?

C₃H₆ClO

400

A compound has a molar mass of 90. grams per mole and the empirical formula CH₂O. What is the molecular formula of this compound?

C₃H₆O₃

500

A compound has an empirical formula of HCO₂ and a molecular mass of 90. grams per mole. What is the molecular formula of this compound?

H₂C₂O₄

Percent Comp to Empirical Formulas

100

What is the empirical formula of a compound that contains 30.4% nitrogen and 69.6% oxygen by mass?

NO₂

200

A compound contains 46.7% nitrogen and 53.3% oxygen by mass. What is the empirical formula of the compound?

NO

300

A compound consists of 25.9% nitrogen and 74.1% oxygen by mass. What is the empirical formula of the compound?

N₂O₅

400

A compound consists of 40.% sulfur and 60.% oxygen by mass. What is the empirical formula of this compound?

SO₃

500

What is the empirical formula  and chemical name of a compound that contains 85% Ag and 15% F by mass?

AgF & Silver Fluoride