Question

18 g of glucose (C₆H₁₂O₆) is added to 178.2 g of water. The vapour pressure of water for this aqueous solution is ______.

Options

• 76.00 torr

• 752.40 torr

• 759.00 torr

• 7.60 torr

Answer 1

18 g of glucose (C₆H₁₂O₆) is added to 178.2 g of water. The vapour pressure of water for this aqueous solution is 752.40 torr.

Explanation:

Moles of glucose = `18/180` = 0.1

Moles of water = `178.2/18` = 9.9

Total moles = 0.1 + 9.9 = 10

`"p"_("H"_2"O")` = Mole fraction × total pressure

= `9.9/10 xx 760`

= 752.4 Torr