Question

A solution contain 1 mole of alcohol and 4moles of water what are the mole fractions of water and alcohol

Answer 1

Answer:

take n1=H2O,n2=alcohol

then

mole fraction. of H2O(n1)=n1/n1+n2

=4/4+1=0.8

molefraction of alcohol (n2)=n2/n1+n2

=1/4+1=0.2

Answer 2

The mole fraction of alcohol is 0.2 and that of water is 0.8

Explanation:

We are given:

Moles of alcohol = 1 mole

Mole of water = 4 moles

Mole fraction of a substance is given by:

$\chi_A=\frac{n_A}{n_A+n_B}$

For alcohol:

Mole fraction of alcohol, $\chi_{\text{alcohol}}=\frac{1}{1+4}=0.2$

For water:

Mole fraction of water, $\chi_{\text{water}}=\frac{1}{1+4}=0.8$

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