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Question

The expression relating to mole fraction of solute (x2) and molarity (M) of the solution is:

A
x2=MM1M(M1M2)+ρ
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B
x2=MM1M(M1M2)ρ
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C
x2=M(M1M2)+ρMM1
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D
x2=M(M1M2)ρMM1
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Solution

The correct option is A x2=MM1M(M1M2)+ρ
Let us consider the problem.
x2=n2n1+n2=n2(m1/M1)+n2=n2M1m1+n2M1
Hence,
=n2M1(m1+m2)+n2M1m2
Now, as ρ=massvolume and M=nm
x2=n2M1Vρ+n2(M1M2)=(n2/V)M1ρ+(n2/V)(M1M2)
=MM1ρ+M(M1M2)


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