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1) Write the balanced equation for the combustion of isooctane (C8H18) to produce water vapor and carbon dioxide on your scratch paper. Assuming gasoline is 100 % isooctane, with a density of 0.692 g/mL, what is the theoretical yield (in grams) of CO2 produced by the combustion of 1.10 * 1010 gallons of gasoline (the estimated annual consumption of gasoline in the U.S.)?

grams of CO2

2) When copper is heated with an excess of sulfur, copper (I) sulfide is formed. In a given experiment, 1.50 g of copper was heated with excess sulfur to yield 1.76 g of copper (I) sulfide.

a) What is the theoretical yield?

grams of Cu2S

b) What is the percent yield?

%