hydrogen cyanide is a highly poisonous, volatile liquid. Itcan be prepared by th

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hydrogen cyanide is a highly poisonous, volatile liquid. Itcan be prepared by the reaction                      CH4(g) + NH3 (G) ----> HCN (g) + 3H2 (g) What is the heat of reaction at constant pressure? Use thefollowing thermochemical equations:                      N2(g) + 3H2 (g) -----> 2NH3 (g); change H = -91.8 kJ                C(graphite) + 2H2 (g) ----> CH4 (g) ; change H = -74.9kJ                      H2(g) + 2C (graphite) + N2 (g) ----> 2HCN (g); change H =270.3 kJ I am supposed to use Reverse & (1/2) Reverse, I have noidea where to begin. Please help me!!! hydrogen cyanide is a highly poisonous, volatile liquid. Itcan be prepared by the reaction                      CH4(g) + NH3 (G) ----> HCN (g) + 3H2 (g) What is the heat of reaction at constant pressure? Use thefollowing thermochemical equations:                      N2(g) + 3H2 (g) -----> 2NH3 (g); change H = -91.8 kJ                C(graphite) + 2H2 (g) ----> CH4 (g) ; change H = -74.9kJ                      H2(g) + 2C (graphite) + N2 (g) ----> 2HCN (g); change H =270.3 kJ I am supposed to use Reverse & (1/2) Reverse, I have noidea where to begin. Please help me!!!

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