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Given: C(("Graphite"))+O(2(g))toCO(2(g...

Given:
`C_(("Graphite"))+O_(2(g))toCO_(2(g)), Delta_rH^@=-393.5 kJ mol^-1`
`H_(2(g))+1/2 O_(2(g)) to H_2O_((l)), Delta_rH^@=-285.8 kJ mol^-1`
`CO_(2(g))+2H_2O_((l)) to CH_(4(g))+2O_(2(g)), Delta_r H^@=+890.3 kJ mol^-1`
Based on the above thermochemical equations, the value of `Delta_r H^@` at 298 K for the reaction `C_(("graphite")) + 2H_(2(g)) to CH_(4(g))` will be _________ .

A

`+74.8 kJ mol^-1`

B

`+144.0 kJ mol^-1`

C

`-74.8 kJ mol^-1`

D

`-144.0 kJ mol^-1`

Text Solution

Verified by Experts

The correct Answer is:
C
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