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Munaf Shetty
Asked: 2022-11-05T21:02:46+05:30 In:

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` cals
B. `+20600` cals
C. `-20400` cals
D. `-2000` cals

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` cals
B. `+20600` cals
C. `-20400` cals
D. `-2000` cals
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1 Answer

  1. 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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