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1) That looks right. 2) Step 1: Moles=Mass/Mr, so it's 144/72= 2mol. Step 2: Stoichiometry means the ratio of oxygen to pentane is 1:8 so moles of oxygen is moles of pentane times 8. 2*8=16mol of oxygen. Step 3: 16= 9.6*10^24. 3) The ratio of oxygen to carbon in CO2 is 1:2. so it's 192/3 = 64.
Pentane gas, C5H12, reacts with oxygen to produce carbon dioxide and water. C5H12(g)+8O2(g) ---> 5CO2(g) +6H2O(g) A. How many grams of pentane must react to produce 4.0 moles of water? B. How many grams of CO2 are produced from 32.0g of oxygen? I was doing my homework and I've been working on...