Calculate the standard heat of formation of C2H2 (g) - acetylene from simple substances, if its heat of combustion is known (see Appendix Table 2) at T = 298 K and p = 1.0133*105 Pa. Assume that the products of combustion CO2(g), H2O(l), calorific values C and H2 are respectively equal: C (graph) O2 = CO2(g) - 393.51 kJ/mol; H2 ½ O2 \u003d H2O (l) -285.84 kJ / mol.

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