Solutions Question 146

Question: A mixture has 18g water and 414g ethanol. The mole fraction of water in mixture is (assume ideal behaviour of the mixture) [MP PMT 2000]

Options:

A) 0.1

B) 0.4

C) 0.7

D) 0.9

Show Answer

Answer:

Correct Answer: A

Solution:

Molecular weight of C2H5OH=24+5+16+1=46

Molecular mass of H2O=18

414g of C2H5OH has 41446=9 mole

18g of H2O has =1818=1 mole

Mole fraction of water =n1n1+n2=11+9

=110=0.1



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