P1 = 7.732 torr T1 = 68.8+273 = 341.8K
P2 = 615.7 torr T2 = 154.3+273 = 427.3K
logP2/P1 = H/2.303R [1/T1 -1/T2]
log615.7/7.732 = H/2.303*8.314 [1/341.8-1/427.3]
1.9010 =H(0.00292-0.00234)/19.147
1.9010 = H*0.00058/19.147
H = 1.9010*19.147/0.00058 = 62755.943J = 62.756KJ >>>>>answer
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