Monday
March 30, 2015

Homework Help: science

Posted by emma on Thursday, April 25, 2013 at 8:02pm.

Calculate the heat of combustion of candle wax in kJ/mole. The standard heat of formation (∆Hf ) of candle wax (C20H42) is -2230 kJ/mole. The standard heat of formation (∆Hf ) of carbon dioxide is -394 kJ/mole. The standard heat of formation (∆Hf ) of water is -242 kJ/mole. The combustion of candle wax equals the ∆HRXN = (∆Hf (products) -(∆Hf (reactamts) ). Donít forget to multiply the ∆Hf by the number of moles from the equation. Remember O2 ∆Hf = 0 because it is an element. Find the ∆HRXN.

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