(Hint: If you dont know where to start, try assuming you have 100g total of solution.) Consider two liquids A and B. The vapor pressure of pure A (molecular weight = 50 g/mol) is 225 torr at 25°C and the vapor pressure of pure B (molecular weight = 75 g/mol) is 90 torr at the same temperature. What is the total vapor pressure at 25°C of a solution that is 25% A amd 75% B by weight?

1. 76 torr

2. 225 torr

3. 335 torr

4. 203 torr

5. 135 torr

6. 191 torr

7. 108 torr

8. 115 torr

9. 124 torr

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