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  4. 150 mL of C 2 HOH (density 0.78 g / mL ) is diluted to 1 L by adding water. Molality of the solution is

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Q. $150\, mL$ of $C _{2} HOH$ (density $0.78\, g / mL$ ) is diluted to $1 \,L$ by adding water. Molality of the solution is

Uttarkhand PMTUttarkhand PMT 2011

Solution:

$150 \,mL\, C _{2} H _{5} OH =150 \times 0.78 \,g$
$=117.0\, g =\frac{117}{46} mol$
Water $=1000-150=850\, g$
Molality $=\frac{117}{46} \times \frac{1}{850} \times 1000=2.99$