27) a) Write the statement of Hess's law. b) Find the change in enthalpy for the given reaction:
C2H4 (g) + 302 (g) + 2C02 (g) + 2H20 (l)
Given,
CzH6 (g) + 7/2 O2 (g) - 2002 (g) + 3H20 (1); ∆H = -1562.0 KJ
H2 (g) + O2(g) H2O (1); ∆H = -286.0 KJ
C2H2(g) + H2(g) C2H6 (g); ∆H = -32.0 KJ
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