25. Solving a chemistry problem

25. Solving a chemistry problem

1. Calculate the standard heat of formation of a compound from simple substances, if its heat of combustion is known at T = 298K and a pressure of 1.0133 * 105 Pa.
Assume that combustion products are CO2 (g), H2O (l) and N2 (g) oxides. Heats of combustion of simple substances:
C graphite O2 \u003d CO2 (g) - 393.795 * 103 J / mol;
H2 1 / 2O2 \u003d H2O (l) -286.043 * 103 J / mol.

Variant Substance ΔНsgor*10-3, J/mol
1 C2H5NO2 (l)
glycocol -981.852

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