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The Delta H(0)(f) (KJ mol^(-1))" for "CO...

The `Delta H_(0)(f) (KJ mol^(-1))" for "CO_(2(g)), N_(2)O_((g)), CO_((g)) and NO_(2(g))` are -393, -10,81 and 34 respectively. What is the value of `Delta H (KJ mol^(-1))`, for the reaction ?
`2NO_(2(g))+3CO_((g)) rarr N_(2)O_((g))+3CO_(2(g))`

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`-836`
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