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Given N(2)(g)+3H(2)(g)rarr2NH(3)(g),De...

Given
`N_(2)(g)+3H_(2)(g)rarr2NH_(3)(g),Delta_(r)H^(Ө)= -92.4 kJ mol^(-1)`
What is the standard enthalpy of formation of `NH_(3)` gas?

Text Solution

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Reaction corresponding to the formation of ammonia can be written as
`1/2 N_2(g) + 3/2 H_2(g) to NH_3 (g)`
`:. Delta_f H^@ [NH_3(g)] = 1/2 Delta_rH^@`
`1/2 xx (-92.4) = -46.2 kJ mol^(-1)`.
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