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Which is the heat of reaction for the fo...

Which is the heat of reaction for the following reaction:
`CH_(4)(g) + NH_(3)(g) rarr 3H_(2)(g) +HCN(g)`
Use the following thermodynamic data in kJ/mol.
`N_(2)(g) + 3H_(2)(g) rarr 2NH_(3) (g) , Delta_(r )H^@ = -91.8`
`C(s) + 2H_(2)(g) rarr CH_(4)(g), Delta_(r )H^(@) = +74.9`
`H_(2)(g) + 2C(s) + N_(2)(g) rarr 2HCN(g), Delta_(r )H^(@) = 261.0`

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