First slide

Concentration methods

Question

Mole fraction of water in 46% (w/w) aqueous solution of ethanol is

Easy

A

0.33
B

0.25
C

0.66
D

0.75

Solution

$W_{C_{2} H_{5} OH} = 46 g; W_{H_{2} O} = 54 g; n_{C_{2} H_{5} OH} = \frac{46}{46} = 1; W_{H_{2} O} = \frac{54}{18} = 3; X_{water} = \frac{n_{i}}{\sum_{} n_{i}} = \frac{3}{1 + 3} = 0.75;$ ;

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