Answer to Question #140720 in General Chemistry for Emer Lindsay

Question

What is the ΔH for the reaction 6NO(g) --> 2N2O(g) + 2NO2 (g)

Answer 1

Using the standard enthalpy of formation at 25°C of NO, NO₂ and N₂O as 90.29KJ/mol, 33.2KJ/mol and 82.05KJ/mol respectively

ΔH=ΔH_products- ΔH_reactants

ΔH= ΔH[2N₂O+2NO2] - ΔH[6NO]

ΔH= [(2×82.05)+(2×33.2)] - [6×90.29]

ΔH=164.1+66.4 - 541.74

ΔH= 230.5 - 541.74

ΔH= -311.24KJ/mol