First slide

Theory of dilute solutions

Question

18 g of glucose (Mol.wt = 180) is added to (X) moles of water. The vapour pressure of water in torr for this aqueous solution is 752.4 torr. The value of (X) is -------------------------(nearest whole number)

Moderate

Solution

$P_{solution} = p_{H_{2} O} = p_{H_{2} O}^{°} χ_{H_{2} O}$
$\frac{752.4}{760} = \frac{n_{H_{2} O}}{0.1 + n_{H_{2} O}}$
$n_{H_{2} O} = \frac{0.099}{0.01} = 9.9$ =10

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