Question

Heat of formation of CO2 and H2O are 96.9 and 68.4 cals respectively and heat of combustion of methane is 213.3 cals . The heat of formation of methane is 

20.4 cals

22.4 cals

24.4 cals

26.4 cals

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Answer 1

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Heat of formation of methane

C + 2H₂ =2CH₄

C= -96.9 cal

H₂ = -68.4 cal

For 2H₂ = 2 x -68.4 = -136.8 cal

Now, for methane it is -213.3 cal

So, the answer is:

-96.9 - 138.8 - ( -213.3) = -22.4

So, the answer is -22.4