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Given C("graphite") + O(2 ) (g) to CO(...

Given
`C_("graphite") + O_(2 ) (g) to CO_(2) (g) , Delta _(r) H^(@) = -393.5 kJ mol^(-1) `
`H_(2) (g) + (1)/(2) O_(2) (g) to H_(2) O (l) , Delta_(r) H^(@) = -285.8 kJ mol^(-1)`
`CO_(2) (g) + 2 H_(2) O (l) to CH_(4) (g) + 2 O_(2) (g) , Delta_(r) H^(@)= + 890 . 3 k J mol^(-1)`
Based on the above thermochemical equations, the value of `Delta_(r)H^(@)` at 298 K for the reaction `C_("(graphite)") + 2 H_(2) (g) to CH_(4) (g)` will be :

A

`+ 144.0 kJ mol^(-1)`

B

`-74.8 kJ mol^(-1)`

C

`-144.0 kJ mol^(-1)`

D

`+ 74.0 kJ mol^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
B
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