Given : N 2 ( g ) + 3 H 2 ( g ) → 2 N H 3 ( g ) ; Δ r H ° = ...

NCERT Class XI Chemistry Thermodynamics Solutions

Question : 13 of 22

Marks: +1, -0

Given : N2(g)+3H2(g) → 2NH3(g) ; ΔrH° = –92.4 kJmol–1. What is the standard enthalpy of formation of NH3 gas?

Solution:

N2(g)+3H2(g) → 2NH3(g) ; ΔrH° = –92.4 kJmol–1
∴ Standard enthalpy of formation of NH3(g) = {-92.4}/2$ = - 46.2 kJ/mol

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