The value of ΔfH⊖ for NH3 is – 91.8 kJ mol–1. Calculate enthalpy change for the following reaction :
2NH3(g) → N2(g) + 3H2(g)
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ΔH for formation is given. For the reverse reaction,ΔHchanges sign as the reverse of exothermic reaction will be endothermic. So, ΔH for decomposition is - (-91.8)=91.8 for one mole. But here, two moles are decomposing,
ΔH=2∗91.8=183.6KJ
answer-183.6kj
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