Answer to Question #268983 in General Chemistry for John

Question

Find the ΔH for the reaction below, given the following reactions and ΔH values: N2(g) + 2O2(g) → 2NO2(g)

N2(g) + 3H2(g) → 2NH3(g) ΔH = -115 kJ

2NH3(g) + 4H2O(l) → 2NO2(g) + 7H2(g) ΔH = -142.5 kJ

H2O(l) → H2(g) + 1/2O2(g) ΔH = -43.7 kJ 

Answer 1

$ΔH _ r ​ =[2(−115)+2(142)+43.7]$

$ΔH _ r ​ =−97.7kJ$