When one mole of CH3OH (l) forms from its elements at 1 atm and 25 degrees C, 238.6 kJ of heat are released, and 35.2 kJ are released when one mole of the gas condenses. How much heat is released when one mole of CH3OH (g) forms from its elements at these conditions?

Answer 1

C(graphite) + 2H2(g) + 1/2 O2(g) ==> CH3OH(l) dH = -283.6 kJ
CH3OH(g) ==> CH3OH(l) dH = -35.2 kJ.
Add equation 1 to the reverse of equation 2 to obtain elements to CH3OH(g), then add the dH for each reaction to obtain total rxn.

Post your work if you get stuck.

Answer 2

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