Question

We can use Hess's law to calculate enthalpy changes that cannot be measured. One such reaction...

We can use Hess's law to calculate enthalpy changes that cannot be measured. One such reaction is the conversion of methane to ethylene:
2CH4(g)⟶C2H4(g)+2H2(g)

Part A

Calculate the ΔH∘ for this reaction using the following thermochemical data:
CH4(g)+2O2(g)⟶CO2(g)+2H2O(l) ΔH∘=−890.3kJ
C2H4(g)+H2(g)⟶C2H6(g) ΔH∘=−136.3kJ
2H2(g)+O2(g)⟶2H2O(l) ΔH∘=−571.6kJ
2C2H6(g)+7O2(g)⟶4CO2(g)+6H2O(l) ΔH∘=−3120.8kJ

Express your answer to four significant figures and include the appropriate units.
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