Ethanol, C2H5OH is mixed with gasoline and sold as gasohol. Use the following to calculate the grams of ehanol needed to provide 293 kJ of heat.

C2H5OH + 3O2 ----> 2CO2 + 3H2O
Delta H = -1235 kJ

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  1. The balanced equation shows that 1 mol C2H5OH provides 1235 kJ of energy. 1 mol C2H5OH = how many grams? I think that is about 46 but you should confirm that.
    So 46 g C2H5OH provides 1235 kJ. You want 293 kJ. It's a simple proportion.

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