Both dimethyl ether, CH_3 - O -CH_3, and ethyl alcohol, CH_3CH_2OH, have been su

Question

Both dimethyl ether, CH_3 - O -CH_3, and ethyl alcohol, CH_3CH_2OH, have been suggested as possible fuels. When reacted with oxygen, O_2, both compounds yield CO_2(g) and H_2O(g). The reactions are called combution reactions. Calculate delta H degree for the combution of dimethyl ether, [delta H_ac degree for dimethyl ether is -317103 kJ/mol.] Express your answer using six significant figures. Calculate delta H degree for the combution of ethyl alcohol. [delta H_ac degree for ethyl alcohol is -3223.53 kJ/mol.] Express your answer using six significant figures.

Explanation / Answer

  clausius-clayperon equation:
temp in K, t1 = -23.7ºC = 249.3K, t2 = -37.8ºC = 235.2K
ln(P2/P1) = (H/R)(1/t1 - 1/t2)
ln(0.526 / 1) = (Hv/8.314J/mole-K)(1/249.3K - 1/235.2K)
-0.642 = = (Hv / 8.314J/mole-K)(-2.4x10^-4)
2669.78 = Hv/8.314
22196.55J or 22.2kJ/mole

part B, did you list Hf as Hformation or molar heat of fusion, Hfusion?
if you listed it as Hformation than b = 185.4kJ/mole

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