On complete combustion of 2 gm methane -26575 cals heat is generated. The heat of formation of methane will be (given heat of formation of `CO_(2)` and `H_(2)O` are - 97000 and - 68000 cais respectivvely) :A. `+20400` calsB. `+20600` calsC. `-20400` calsD. `-2000` cals

On complete combustion of 2 gm methane -26575 cals heat is generated.

1.	On complete combustion of 2 gm methane -26575 cals heat is generated. The heat of formation of methane will be (given heat of formation of `CO_(2)` and `H_(2)O` are - 97000 and - 68000 cais respectivvely) :A. `+20400` calsB. `+20600` calsC. `-20400` calsD. `-2000` cals
Answer» Correct Answer - C `(Delta H_("comb."))_(CH_(4))=(-26575)/(2)xx16=-212600 Cal mol^(-1)` `CH_(4)+2O_(2)rarr CO_(2)+2H_(2)O , Delta H_("comb.")=-212600 Cal mol^(-1)` `Delta H=Sigma (Delta H_(f))_(P)-Sigma (Delta H_(f))_(R )-212600 =[(-97000)+2xx(-68000)]=[Delta H_(f)(CH_(4))+0]` `Delta H_(f)(CH_(4))=-233000+212600` `therefore Delta H_(f)(CH_(4))=-20400 Cal`

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On complete combustion of 2 gm methane -26575 cals heat is generated. The heat of formation of methane will be (given heat of formation of `CO_(2)` and `H_(2)O` are - 97000 and - 68000 cais respectivvely) :A. `+20400` calsB. `+20600` calsC. `-20400` calsD. `-2000` cals

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