13. a. 6 moles are needed
b. 5 moles are produced
c. 5 moles are produced
14. a. 1 mole can be produced
b. 621 g can be produced
c. 28 g can be produced
d. 415 is the mass that will produce 415 g
15. In carbon dioxide, oxygen's molar mass is 32 and carbon's molar mass is 12, therefore you would divide oxygen's molar mass by the total mass of both atoms and multiply that by 100%, and get 72%.
16. a. 216/248 = 87%
b. 54/102 = 52%
c. 40/100 = 40%
17. a. lead is 10% of PbSO4
b. there is 60% PbSO4 in the ore sample
c. Pb is 68% in the total ore sample
d. on paper
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