chemistry

Hydrogen cyanide is a highly poisonous, volatile liquid. It can be prepared by the following reaction.
CH4(g) + NH3(g) → HCN(g) + 3 H2(g)
What is the heat of reaction at constant pressure? Use the following thermochemical equations.
N2(g) + 3 H2(g) → 2 NH3(g) ΔH = −91.8 kJ
C(graphite) + 2 H2(g) → CH4(g) ΔH = −74.9 kJ
H2(g) + 2 C(graphite) + N2(g) → 2 HCN(g) ΔH = 270.3 kJ

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