hep solving it

6. 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(1) sulfide, by a multistep process. After an initial grinding, the first step is to "roast the ore (heat it strongly with oxygen gas) to form powdered copper(1) oxide and gaseous sulfur dioxide a. How many moles of oxygen are required to roast 10.0 mol copper(1) sulfide? 2 CUS. 7sj+ 302( 9 ) # 2 ( U2 0(3) + 2502 (9) b. How many grams of sulfur dioxide are formed when 10.0 mol of copper(1) sulfide is roasted? c. How many grams of oxygen are required to form 2.86 g of copper(1) oxide