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Question

The mole fraction of water in 98% (w/w) H2SO4 solution is :

A
0.1
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B
0.9
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C
0.8
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D
0.02
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Solution

The correct option is A 0.1
Mole fraction is defined as the ratio of moles of the one component to the ratio of total number of moles.

so, mole fraction of water = moles of watertotal number of moles

Let mass of H2SO4 solution = 100 g
Mass of H2SO4=98 g

mass of water =(10098)=2 g

So, moles of water = 218=0.111 moles

moles of H2SO4=9898=1

so, mole fraction of water = 0.1110.111+1=0.1
Option A is correct.

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