Question

An aqueous solution of alcohol contains $18 \,g$ of water and $414 \,g$ of ethyl alcohol. The mole fraction of water is

• A. $0.7$
• B. $0.9$
• C. $0.1$
• D. $0.4$

Answer 1

Answer: (C)

$n _{ C _{2} H _{5} OH }=\frac{414}{46}=9$
$n _{ H _{2} O }=\frac{18}{18}=1$
$X _{ H _{2} O }=\frac{1}{10}=0.1$