Homework Assignment 17

2SCS #13-21 p. 181

13. 

• a. 6 moles
• b. 5 moles
• c. 5 moles

14. 

• a. 1 mole
• b. 621 g
• c. 28 g
• d. 415 g

15. 14 + 16 + 16 = 46

32/46 = 70%, not 67%

16. 

• a. Ag2S = 87% silver
• b. Al2O3 = 53% aluminum
• c. CaCO3 = 40% calcium

17. 

• a. PbSO4 = 68% lead
• b. 10% PbSO4 in the ore sample
• c. 6.8% Pb in the total ore sample
• d.

10% lead in the PbSO4 ore

68% lead in lead sulfate

18. 

• a. Reusing means a product is used again for the same purpose, whereas recycling means that a product is used again in a different setting.
• b. Two examples of recycling are old computer parts and compost piles. Two examples of reusing are clothes and containers.

19. 

• a. Four examples of renewable resources are solar energy, biomass, wood, and natural gas.
• b. Four examples of nonrenewable resources are fossil fuels, crude oil/petroleum, gas, and coal.

20.

• a. Reusing
• b. Recycling
• c. Recycling

21. A light bulb would only be recyclable, whereas a newspaper would be recyclable and reusable.