Problem: The vapor pressure of pure water (H2O) at 30 °C is 40 torr. If salt (NaCl) is dissolved into a sample of water until the total vapor pressure of the mixture at 30 °C is 32 torr, what is the mol fraction of  salt? 1. 0.2 2. 0.5 3. 0.8 4. 0.65 5. 0.35

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The vapor pressure of pure water (H2O) at 30 °C is 40 torr. If salt (NaCl) is dissolved into a sample of water until the total vapor pressure of the mixture at 30 °C is 32 torr, what is the mol fraction of  salt?

1. 0.2

2. 0.5

3. 0.8

4. 0.65

5. 0.35

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