A) 0.1
B) 0.4
C) 0.7
D) 0.9
Correct Answer: A
Solution :
Molecular weight of \[{{C}_{2}}{{H}_{5}}OH=24+5+16+1=46\] Molecular mass of \[{{H}_{2}}O=18\] 414g of \[{{C}_{2}}{{H}_{5}}OH\]has \[\frac{414}{46}=9\] mole 18g of \[{{H}_{2}}O\] has \[=\frac{18}{18}=1\] mole Mole fraction of water \[=\frac{{{n}_{1}}}{{{n}_{1}}+{{n}_{2}}}=\frac{1}{1+9}\]\[=\frac{1}{10}=0.1\]
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