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C(s) + 2N2O --> CO2 + 2N2 - ΔH1 /*(-1)
-C(s) - 2N2O(g) --> -CO2 - 2N2 + ΔH1
C(s) + O2(g) --> CO2(g) - ΔH2
------------------------------------------------------------- dodaję stornami
-2N2O(g) + O2(g) --> -2N2(g) + ΔHx /+2N2 + 2N2O
2N2(g) + O2(g) --> 2N2O(g) + ΔHx
ΔHx = ΔH1 - ΔH2
ΔHx = -394kJ - (-557kJ) = 163kJ