1. Please reduce following data for Methyl Ethyl Ketone (1) and Toluene (2) at 50oC:
|
|
|
|
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P /kPa
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x1
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y1
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12,30( P2sat)
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0.0000
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0.0000
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15.51
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0.0895
|
0.2716
|
|
18.61
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0.1981
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0.4565
|
|
21.63
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0.3193
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0.5934
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|
24.1)1
|
0.4232
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0.6815
|
|
25.92
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15 119
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0.7440
|
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27.96
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0,6096
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0.8050
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|
30.12
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0.7135
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0.8639
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|
31.75
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0.7934
|
0.904A
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|
34.15
|
0.911)2
|
0.9590
|
|
36.09(P1sat)
|
1.00(x)
|
1.0000
|
By plotting ln(γ1) and In(γ2) and GE/(x1x2RT) against xl Discuss significance of activity coefficients at infinite dilutions and evaluate values of A12 and A21 in:
GE / x1x2RT = A21x1 + A12x2
2. A researcher mixed two liquids A and B in equal volumetric amount (100 ml each) with the objective to form 200 ml of a solution. However, it was later found that the net volume was somewhat less than expected. Calculate this net decrease in the volume. Also this researcher then decided to simply add more volume of liquid B until the total volume became exactly 200 ml - how much liquid B the researcher had to add'?
Use VA = 40.727 cm3 mol and VB = 18.068 cm3 mol-1 with corresponding partial molar volumes as 38.632 cm3 mo1-1 and 17.765 cm3 mol-1 respectively. Remember net volume of a solution is algebraic sum of partial molar volumes. Also do not forget that liquid arc "not" ideal gases - their volumes fractions and mole fractions arc different. Molecular weight of A and B are 40.727 and 180.068 respectively.