Calculate DSo for the formation of CH3OH(l) from its elements.?

Question

Calculate DSo (degree) for the formation of CH3OH(l) from its elements.

I'm so lost on these thermodynamic problems! Explanations would be greatly appreciated. thanks

Answer 1

You need to write the correct equation:

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

Then look up the entropies. The entropy change of formation of methanol is the entropy of methanol, minus (entropy of graphite + 2 x entropy of hydrogen + 1/2 x entropy of oxygen).