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25. Solving a chemistry problem
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Uploaded: 04.05.2023
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7. Find the change in entropy g kg of a substance during heating (cooling) in the temperature range from T1 to T2, if its melting and boiling points, average heat capacities, heats of melting and evaporation are known. (Table 3)
2. Calculate what the changes in entropy, Gibbs energy, Helmholtz energy, internal energy, enthalpy and work of expansion are equal to if 1 mole of a substance whose vapor obeys the laws of ideal gases passes from a liquid to a vapor state at a normal boiling point.
Table 3
variant substance g, kg T1 T2 Melting Evaporation Specific heat capacity J/(kg*K)
Tmelt ΔHmelt*10-3 J/mol Tn.b.k ΔHtest*10-3 J/mol Сptv*
10-3 Сpzh*
10-3 Cpg*
10-3
1 2 3 4 5 6 7 8 9 10 11 12
7 CH3COOH 30 260 430 289.8 11.724 391.4 24.410 2.039 2.057 1.197
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