21. Solving a chemistry problem
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8. Calculate the standard heat (enthalpy) of formation of the compound, if its heat of combustion ΔH0comb is known (Table 2) at T=298 K and p=1.0133*I05 Pa. Heats of combustion of simple substances:
C O2 \u003d CO2 (g) - 393.79 * 106 J / kmol
H2 1 / 2O2 =H2O (g) - 286.26 * 106 J / kmol
variant The reaction of formation of the compound ΔН0sgor * 10-6, J / kmol
8 C H2 O2 \u003d CH2O2 (l) -256.48
C O2 \u003d CO2 (g) - 393.79 * 106 J / kmol
H2 1 / 2O2 =H2O (g) - 286.26 * 106 J / kmol
variant The reaction of formation of the compound ΔН0sgor * 10-6, J / kmol
8 C H2 O2 \u003d CH2O2 (l) -256.48
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