13. a. 6 moles
b. 5 moles
c. 5 moles
14. a. 17 moles
b. 100%
c. 50%
d. 415 g
15. 16 x 2 = 32
32/44 x 100 = 72%
32/44 x 100 = 72%
16. a.87%
b.53%
c.58%
17. a. 68.3%
b. 10%
c. 25%
18. Recycling is when an object is taken and reshaped or used to create another object. Reusing is when one object is used multiple times.
19. a. water, plants, soil, air
b. platinum, gold, silver, coal
20. a. reusing
b. recycling
c. reusing
21. ?
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