Department of Chemistry Faculty of Science and Mathematic UNIVERSITI PENDIDI!N SU"T!N IDRIS !SSI#MENT $ SF%&$% 1. a) Liquid water at 100 o C is in equilibrium with water vapour at 1 atm pressure. If the e change associated with the vaporization of liquid water at 100 o C is 0.!0 "# mol $1 % determine &' and &(b) *t +, 0 C% 1 mol of an ideal gas is e-panded isothermally from + to +0 liters. Calc &/% &(% &* and &'. o the values depend on whether the process is r irreversible+. ne mole of methane gas initially at +, o C 23 i ) and 1 atm pressure is heated at constant pressure until the volume has doubled. 3he variation of the molar heat capacity w temperature is given by C p%m 4 ++.5 6 .7 - 10 $5 3 #8 $1 mol $1 etermine the final temperature 3 f % &/ and & for the process. C
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Department of ChemistryFaculty of Science and
MathematicUniversiti Pendidikan sultan Idris
ASSIGMENT 1 SKF3013
1. a) Liquid water at 100oC is in equilibrium with water vapour
at 1 atm pressure. If the enthalpy change associated with the
vaporization of liquid water at 100oC is 40.60 kJ mol-1, determine
G and S?
b) At 250C, 1 mol of an ideal gas is expanded isothermally from
2 to 20 liters. Calculate U, H, S, A and G. Do the values depend on
whether the process is reversible or irreversible?
2. One mole of methane gas initially at 25oC (Ti) and 1 atm
pressure is heated at constant pressure until the volume has
doubled. The variation of the molar heat capacity with absolute
temperature is given by
Cp,m = 22.3 + 4.8 x 10-3 T JK-1mol-1
Determine the final temperature Tf, H and U for the
process.C
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