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Using Hess’ Law, compare the heat of combustion of one liter of ethanol with the heat...

Using Hess’ Law, compare the heat of combustion of one liter of ethanol with the heat of combustion of one liter of octane. The density of ethanol is 0.789 g/mL and that of octane is 0.703 g/mL.

how do you calculate the number -343.909 kj for CO2 or -241.101 of H2O.. or 200.447kj/mol for C2H4OH?

thank you!

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