4. Calculate ΔH350 of the reaction: 2CH4(g)=C2H2(g) 3H2(g), if the standard enthalpies of formation (ΔH298, kJ*mol-1) of compounds and their heat capacity (Cp, J*mol-1*K-1) are equal:
Substance ΔH298 Cp.298 Cp.400
CH4(g) -74.85 35.70 40.63
C2H2(g) 226.75 43.93 50.08
H2(g), - 28.84 29.18

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