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The following thermochemical equations r...

The following thermochemical equations represent combustion of ammonia and hydrogen:
`4 NH_3(g)+3 O_2(g) rarr 6H_2 O(l)+2 N_2(g)` , `Delta H=-1516 k J`
`2 H_2(g)+O_2(g) rarr 2 H_2 O(l)` , `Delta H=-572 kJ`
Calculate enthalpy of formation of ammonia.

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