Chemistry | TS EAMCET 2017 | Discussion Page

Commercially available $H_{2}SO_{4}$ is 98 g by weight of $H_{2}SO_{4}$ and 2 g by weight of water . It's density is

1.38 g cm^-3. Calculate the molality (m) of $H_{2}SO_{4}$(molar mass of $H_{2}SO_{4}$ is 98 gmol^-1)

A) 500 m

B) 20 molal

C) 50 m

D) 200 m

Option A

Given weight of solute 98 g, molar mass of solute 98 g mol^-1 weight of solute =2g

Molality= weight of $H_{2}SO_{4}$/ molecular weight of $H_{2}SO_{4}$

$\times$ 1000/ weight of water

=$\frac{98}{98} \times \frac{1000}{2}=500 m$

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