Problem: The vapor pressure of pure acetone (CH 3COCH3) at 30°C is 240 torr. If salt (NaCl) is dissolve into a sample of acetone until the total vapor pressure of the mixture at 30°C is 180 torr, what is the mol fraction of acetone? 1. 0.2 2. 0.25 3. 0.8 4. 0.75

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The vapor pressure of pure acetone (CH 3COCH3) at 30°C is 240 torr. If salt (NaCl) is dissolve into a sample of acetone until the total vapor pressure of the mixture at 30°C is 180 torr, what is the mol fraction of acetone?

1. 0.2

2. 0.25

3. 0.8

4. 0.75

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