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Lata Loke
Asked: 2022-11-08T00:04:32+05:30 In:

The difference between `Delta H` and `Delta U` for the combustion of methane at `27^(@)C` will be (in `J mol^(-1)`)
A. `8.314 xx 27 xx – 3`
B. `8.314 xx 300 xx (-3)`
C. `8.314 xx 300 xx (-2)`
D. `8.314 xx 300 xx1`

The difference between `Delta H` and `Delta U` for the combustion of methane at `27^(@)C` will be (in `J mol^(-1)`)
A. `8.314 xx 27 xx – 3`
B. `8.314 xx 300 xx (-3)`
C. `8.314 xx 300 xx (-2)`
D. `8.314 xx 300 xx1`
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  1. Correct Answer – C
    Thermochemical equaiton for the combustion of methane is
    `CH_(4) (g) + 2 O_(g) rarr CO_(2) (g) + 2H_(2) O (1)`
    According to thermodynamics,
    `Delta H = Delta U + Delta n_(g) RT`
    or `Delta H – Delta U = Delta n_(g) RT`
    Where `Delta n_(g) = sum n_(P) (g) – sum n_(R ) (g)`
    `= (1) – (1 + 2)`
    `= – 2`
    `:. Delta – Delta U = (-2) (8.314) (300)`

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