Question

The mole fraction of water in 20 % aqueous solution of h2o2 is

Answer 1

mole fraction of water = 80/18/80/18+20/34.
= 68/77.

hence,, 68/77 is the mole fraction of water in 20% aqueous solution of h2o2.

Answer 2

The mole fraction of water in 20 % aqueous solution of $H_2O_2$ is 0.88.

Explanation:

Mole fraction is the ratio of moles of a particular component to the total number of moles.

Given : 20 g of $H_2O_2$ in 100 g of solution i.e (100-20) g = 80 g of water is present

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

a) $\text{Number of moles of }H_2O_2=\frac{20g}{34g/mol}=0.59moles$

b) $\text{Number of moles of water}=\frac{80g}{18g/mol}=4.4moles$

$\text {mole fraction of water}=\frac{\text {moles of water}}{\text {moles of water+moles of }H_2O_2}$

Putting in the values

$\text {mole fraction of water}=\frac{4.4}{4.4+0.59}=0.88$

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