Gasohol is a fuel containing ethanol (C2H6O) that burns in oxygen (O2) to give carbon dioxide and water. a) Write the balance equation for the reaction. b) How many moles of O2 are needed to completly react with 4.0 mol of C2H6O? c) If a car produces 88 g of CO2, how many grams of O2 are used up in the reation