the following data (s) are given as the standed enthalpies of combustion of `C(s),H_(2)(g) and CH_(4)(g)and -393.5kJ mol ^(-1) 285.8 kJmol^(-1) and -890.4 kJ mol^(-1)` respectively at 298 K . The standed enthalpy of fromation of methation of methane `[CH_(4)(g)]` isA. `+ 724 . 42 kJ mol^(-1)`B. `+74.7 kJ mol^(-1)`C. `-114.82 kJ mol^(-1)`D. `-194.62 kJ mol ^(-1)`

the following data (s) are given as the standed enthalpies of combusti

1.	the following data (s) are given as the standed enthalpies of combustion of `C(s),H_(2)(g) and CH_(4)(g)and -393.5kJ mol ^(-1) 285.8 kJmol^(-1) and -890.4 kJ mol^(-1)` respectively at 298 K . The standed enthalpy of fromation of methation of methane `[CH_(4)(g)]` isA. `+ 724 . 42 kJ mol^(-1)`B. `+74.7 kJ mol^(-1)`C. `-114.82 kJ mol^(-1)`D. `-194.62 kJ mol ^(-1)`
Answer» Correct Answer - b `underset(-393.5)(C(s))+ underset(-285.8)(2H_(2)(g))tounderset(-890.4)(CH_(4)(g)` `Delta_(r)H(CH_(4)(g))=Delta_(c)H^(-)(C)-Delta_(C)H^(-)(H_(2)(g))xx2` ` -890.4 -(-393.5)-(-285xx2)` `+74.7 kJ//mol^(-1)`

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