The heats of formation of CO 2 (g) andH 2 O(l) are -394 kJ/mol and -285.8 kJ/mol

Question

The heats of formation of CO2(g) andH2O(l) are -394 kJ/mol and -285.8 kJ/mol respectively.Using the data for the following combustion reaction, calculate theheat of formation of CH3OH(l).                2CH3OH(l)+ 3O2(g) 2CO2(g) +4H2O(l)              Ho= -1454kJ (The answer is 238.6 kJ, but I dont know how to do it.Please show your work.thanks)             The heats of formation of CO2(g) andH2O(l) are -394 kJ/mol and -285.8 kJ/mol respectively.Using the data for the following combustion reaction, calculate theheat of formation of CH3OH(l).                2CH3OH(l)+ 3O2(g) 2CO2(g) +4H2O(l)              Ho= -1454kJ (The answer is 238.6 kJ, but I dont know how to do it.Please show your work.thanks)            

Explanation / Answer

delH = -1454 kJ = [4*-285.8 + 2*-394] - [3*0 +2*H_formatoin] -1454 = -1931.2 - 2*Hformation Hforamtion = -238.6 kJ

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