Mole Calculations Review Worksheet – answers on next page

Chemistry Honors

Name: ___________________________________

Mole Calculations Review Worksheet – answers on next page. Complete the problems on this worksheet to review for the Chapter 10 test. Be sure to use dimensional analysis, and label all numbers with units when solving the problems. 1. Calculate the molar mass of each compound. a. LiOH c. Mg(C2H3O2)2 b. barium bromide

d. Ca(NO3)2

2. How many molecules are in 45.0 grams CH4? 3. How many moles are in 18.8 grams NaOH? 4. A salt shaker containing 9.58 x 1023 formula units NaCl contains how many moles? 5. Which of the following has the greatest mass? 4.2 moles C

or

8.34 x 1024 f.u. CaCO3

or

12.6 g Al(NO3)3

6. Find the number of representative particles in each of the following: a. 0.28 mol Ni

c. 1.32 mol F2

b. 1.84 mol S

d. 3.15 mol K3PO4

7. How many liters would 1.45 moles oxygen gas occupy at STP? 8. How many grams would 15.8 L of ammonia occupy at STP? 9. How many total atoms are in 5.8 mol CaCl2? 10. Calculate the percent composition of each element in the following compounds: a. iron(III) oxide

c. methane

b. Ca3(PO4)2

d. H2SO4

11. Calculate the empirical and molecular formulas of adrenaline. The compound has a molecular mass of 183 g/mol, and is 59.0% C, 7.1% H, 26.2% O, and 7.7% N by mass. 12. A compound is 72.2% Mg and 27.8% N by mass. Calculate the empirical formula. 13. Nicotine is 74.1% C, 8.6% H, and 17.3% N by mass. The molecular mass of nicotine is 162 g/mol. Calculate its empirical and molecular formulas. 14. How many total ions are in 2.95 grams MgSO3?

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