Answer to Question #212695 in Physical Chemistry for pesky

Question

T°C

25.2

30.5

40.4

45.0

50.0

P(mmHg)

24.04

32.90

55.50

75.20

102.0

The following data are obtained for vapour pressure temperature of water. Explain the steps to obtain the molar heat of vaporization

Answer 1

If the problem provides the two pressure and two temperature values, use the equation ln(P1/P2)=(Hvap/R)(T1-T2/T1xT2), where P1 and P2 are the pressure values; Hvap is the molar heat of vaporization; R is the gas constant; and T1 and T2 are the temperature values.