Sample Problem 3.8
Calculating Amounts of Reactants and Products
PROBLEM:
In a lifetime, the average American uses 1750 lb (794 kg) of copper in coins, plumbing, and wiring. Copper is obtained from sulfide ores, such as chalcocite, or copper(I) sulfide, by a multistage process. After an initial grinding step, the first stage
(a) How many moles of oxygen are required to roast 10.0 mol of copper(I) sulfide?
(b) How many grams of sulfur dioxide are formed when 10.0 mol of copper(I) sulfide are roasted?
(c) How many kilograms of oxygen are required to form 2.86 kg of copper(I) oxide?
PLAN:
write and balance equation
find mols O2
find mols SO2
find g SO2
find mols Cu2O
find mols O2
find kg O2
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