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Using the equations
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N₂ (g) + 3 H2 (g) → 2 NH3 (g) AH = -91.8 kJ/mol
C(s) + 2 H₂ (g) → CH4 (g) AH° = -74.9 kJ/mol
H₂ (g) + 2 C(s) + N₂ (g) → 2 HCN (g) AH° = 270.3 kJ/mol
Determine the enthalpy (in kJ/mol) for the reaction
CH4 (g) + NH3 (g) → HCN (g) + 3 H₂ (g).

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