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calculate the heat of formation of methane given the heat of combustion of C,H2 and CH4 as-393,-285 and -887kj per mol respectively.

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Write and balance the equations for
H2 + O2 ==>
C + O2 -->
CH4 + O2 ==>

Reverse 3 and add to 1 and 2. See if you don't get
C + 2H2 ==> CH4.

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