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Chapter 11 ­ Supplemental Problems - The Mole

1. Identify and calculate the number of representative particle in each of the following quantities. a. 2.14 moles of gold a. 6.35 g lithium b. 0.151 mole of nitrogen oxide (NO) b. 346 g zinc c. 11.5 moles of potassium bromide (KBr) c. 115 g nickel 2. Calculate the number of moles in the substance that contains the following number of representative particles. a. 8.92 x 1023 atoms of barium 4. Calculate the number of moles in each of the

following quantities.

5. How many atoms are in the following samples? a. 1.24 g cobalt

b. 5.50 x 1025 molecules of carbon monoxide (CO)

b. 0.575 g cesium

c. 2.66 x 1022 formula units of potassium iodide (KI)

c. 65.6 g silicon

3. Determine the mass in grams of each of the following quantities. a. 1.24 moles beryllium

6. Which quantity has the greatest mass? a. 4.16 x 1023 atoms of radium

b. 3.35 moles of calcium

b. 1.50 x 1020 atoms of cadmium

c. 0.155 mole of sulfur

c. 1.33 x 1022 formula units of potassium iodide

Supplemental Problems

Transcribed by Zachary M Sohn

Chemistry: Matter and Change

Chapter 11

1

7. Determine the molar mass of each of the following compounds. a. formic acid (CH2O2)

Use binder paper for the next three problems: 11. Determine the empirical formula for a 100.00-g sample of a compound having the following percent composition. a. 94.07% sulfur and 5.93% hydrogen

b. ammonium dichromate ((NH4)2Cr2O7) b. 80.68% mercury, 12.87% oxygen, and 6.45% sulfur

8. What is the mass in grams of each of the following quantities? a. 2.53 moles of lead(II) nitrate (Pb(NO3)2)

12. A 48.30-g sample of an aluminum-iodide compound contains 3.20 g of aluminum. What is the empirical formula for the compound?

13. Caffeine is a compound found in some natural coffees and teas and in some colas. b. 4.62 moles of magnesium bromide (MgBr2) a. Determine the empirical formula for caffeine, using the following composition of a 100.000-g sample. 9. Calculate the number of moles in each of the following samples. a. 3.75 g calcium carbide (CaC2) 49.47 grams of carbon, 28.85 grams of nitrogen, 16.48 grams of oxygen, and 5.20 grams of hydrogen b. If the molar mass of caffeine is 1964.19g/mol,

calculate its molecular formula.

b. 245 g aluminum nitrite (Al(NO2)3)

10. Determine the percent of composition of each of the following compounds. a. Manganese oxide (MnO)

b. Propanol(C3H8O)

c. Calcium Phosphate (Ca3(PO4)2)

Supplemental Problems

Transcribed by Zachary M Sohn

Chemistry: Matter and Change

Chapter 11

2

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