x grams of water is mixed with 69 grams of ethanol. Mole fraction of ethanol in the resultant solution is 0.6. What is the value of x in grams?
54
36
180
18
A
36
B
180
C
54
D
18
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Solution
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Mole fraction of water in solution = 1−0.6=0.4
Number of moles of water in solution = n
Moles of alcohol =Given massmolecular mass
=6946
=32
nn+32=0.4
or, n=1
∴ Mass of water in solution = 18 g.
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