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Eclair_de_XII
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Homework Statement
Given the data:
N2(g) + O2(g) → 2NO(g) ΔH = 180.7kJ
2NO(g) + O2(g) → 2NO2(g) ΔH = -113.1kJ
2N2O(g) → 2N2(g) + O2(g) ΔH = -163.2kJ
use Hess's law to calculate ΔH for the reaction
N2O(g) + NO2(g) → 3NO(g)
Homework Equations
"Hess's law states that if a reaction is carried out in a series of steps, ΔH for the overall reaction equals the sum of the enthalpy changes for the individual steps."
The Attempt at a Solution
½(N2(g) + O2(g) → 2NO(g)) ΔH = 90.35kJ
½(2N2O(g) → 2N2(g) + O2(g)) ΔH = -81.6kJ
3(N(g) + O(g) → NO(g)) ΔH = 271.05 kJ
½(2NO(g) + O2(g) → 2NO2(g)) ΔH = -56.55kJ
N2(g) + O(g) → N2O(g) ΔH = 81.6kJ
271.05 - (-56.55 + 81.6) = 246kJ
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