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Question

The standard heat of formation at 298 K for CCl4(g),H2O(g),CO2(g),HCl(g) are 25.5,57.8,94,1,22.1 kcalmol1 respectively, calculate ΔHo298 for the reaction,
CCl4(g)+2H2O(g)CO2(g)+4HCl(g)

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Solution

ΔHreaction=HeatofformationofproductsHeatofformationofreactants
[ΔHf(CO2)ΔHf(HCl)][ΔHf(CCl4)ΔHf(H2O)]=[94.1+4×(22.1)][25.5+2×(57.8)]=41.4kcal

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