What is the mole fraction of nitric acid in a(n) 8.46% (by mass) aqueous solution of nitric acid

The mole fraction of nitric acid is 0.026

Explanation:

We are given:

8.46 % (by mass) of aqueous nitric acid solution

This means that 8.46 grams of nitric acid is present in 100 grams of solution

Mass of water (solvent) = Mass of solution - Mass of solute

Mass of water = 100 - 8.46 = 91.54 g

To calculate the number of moles, we use the equation:

    .....(1)

Given mass of nitric acid = 8.46 g

Molar mass of nitric acid = 63 g/mol

Putting values in equation 1, we get:

Given mass of water = 91.54 g

Molar mass of water = 18 g/mol

Putting values in equation 1, we get:

Mole fraction of a substance is given by:

For methanol:

Hence, the mole fraction of nitric acid is 0.026

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