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18 g glucose \( \left(C_{6} H_{12} O_{6}\right) \) is added to \( 178.2 \mathrm{g} \) of water. The vapour pressure of this aqueous solution at \( 100^{0} C \) in torr is:

1. 7.60
2. 76.00
3. 752.40
4. 759.00

Correct answer: 752.40

Solution

Glucose is nonvolatile, so the solution’s vapour pressure depends only on the mole fraction of water. Since the water mole fraction is slightly less than 1, the vapour pressure is slightly below 760 torr.

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