4. Determine the standard heat of formation of C4H8O2(l) ethyl acetate from simple substances, if its heat of combustion is known at a temperature T=298K and a pressure P=1.0133*105 Pa ( ). Assume that the products of combustion are CO2(g) and H2O(l).
Use the known heats of combustion of simple substances:
C(graphite) O2 = CO2(g) ΔH=-393.795 kJ/mol;
H2 1 / 2O2 \u003d H2O (l) ΔH \u003d -286.043 kJ / mol.

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