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December 19, 2014

Homework Help: CHEMISTRY

Posted by HANNAH on Monday, September 22, 2008 at 8:13pm.

Given the following heats of combustion.

CH3OH(l) + 3/2 O2(g) -> CO2(g) + 2 H2O(l) ΔHrxn = -726.4 kJ

C(graphite) + O2(g) ->CO2(g) ΔHrxn = -393.5 kJ

H2(g) + 1/2 O2(g) -> H2O(l) ΔHrxn = -285.8 kJ

Calculate the enthalpy of formation of methanol (CH3OH) from its elements.
WebAssign will check your answer for the correct number of significant figures. kJ

C(graphite) + 2 H2(g) + 1/2 O2(g)
-> CH3OH(l)

I don't even know where to begin on this problem

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