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  4. The molality of a solution having 18 g of glucose (mol. wt. = 180) dissolved in 500 g of water is

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Q. The molality of a solution having $18\, g$ of glucose $(mol.\, wt. = 180)$ dissolved in $500\, g$ of water is

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Solution:

Moles of glucose $=\frac{\text{Mass}}{\text{Molecular mass}}=\frac{18}{180}$
$\Rightarrow $ Molality $=\frac{0.1}{500}\times1000$
$=0.2\,M$