Question

The ΔHof of gaseous dimethyl ether (CH3OCH3) is –185.4 kJ/mol; the vapour pressure is 1.00 atm at –23.7oC and 0.526 atm at –37.8oC.
a) Calculate ΔHovap of dimethyl ether.
b) Calculate ΔHof of liquid dimethyl ether

Any idead how to calculate for the heat of formation?

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