7. For the substance indicated below with the corresponding problem number, calculate the standard enthalpy of formation at 298 K ΔfН°298, knowing its standard enthalpy of combustion (ΔCH°), and also calculate the standard enthalpy of formation at 398 K, using the obtained value ΔfН°298 and isobaric heat capacities СР (see ΔCH° in Table 6.3 and СР in Tables 6.3 and 6.4 of Appendix 6).
Combustion products CO2 (g), H2O (l), N2 (g). 7. Acetic acid С2H4O2 (g).

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