(A) Number of moles of ethyl alcohol $(C_2H_5OH)$ = $\frac{138}{46} = 3 \ mol$. Number of moles of water $(H_2O)$ = $\frac{72}{18} = 4 \ mol$. Mole fr

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(A) Number of moles of ethyl alcohol $(C_2H_5OH)$ = $\frac{138}{46} = 3 \ mol$. Number of moles of water $(H_2O)$ = $\frac{72}{18} = 4 \ mol$. Mole fraction of alcohol $(X_{C_2H_5OH})$ = $\frac{3}{3+4} = \frac{3}{7}$. Mole fraction of water $(X_{H_2O})$ = $\frac{4}{3+4} = \frac{4}{7}$. The ratio of mole fraction of alcohol to water is $\frac{X_{C_2H_5OH}}{X_{H_2O}} = \frac{3/7}{4/7} = \frac{3}{4}$.

Class 11 Chemistry Some Basic Concepts of Chemistry The mole concept

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$138 \ g$ of ethyl alcohol is mixed with $72 \ g$ of water. The ratio of mole fraction of alcohol to water is

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A
$3: 4$
B
$1: 2$
C
$1: 4$
D
$1: 1$

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$138 \ g$ of ethyl alcohol is mixed with $72 \ g$ of water. The ratio of mole fraction of alcohol to water is

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Assertion : Equal moles of different substances contain same number of constituent particles.
Reason : Equal weights of different substances contain the same number of constituent particles.