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Given C(2)H(2)(g)+H(2)(g)rarrC(2)H(4)(g)...

Given `C_(2)H_(2)(g)+H_(2)(g)rarrC_(2)H_(4)(g): DeltaH^(@)=-175 " kJ mol"^(-1)`
`DeltaH_(f(C_(2)H_(4),g))^(@)=50 " kJ mol"^(-1), DeltaH_(f(H_(2)O,l))^(@)=-280 " kJ mol"^(-1), DeltaH_(f(CO_(2)g))^(@)=-390 " kJ mol"^(-1)`
If `DeltaH^(@)` is enthalpy of combustion (in kJ `"mol"^(-1)`) of `C_(2)H_(2)`(g), then calculate the value of `|(DeltaH^(@))/(257)|`

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