Question

A solution of naphthalene in benzene is 3 % by mass of naphthalene . what is the mass percent of benzene?​

Answer 1

Answer:

The mass percent of solute and solvent add up to 100%

Napthalene is the solute while benzene is the solvent

so we get

%Napthalene+%benzene=100%

%benzene=97%

Answer 2

The mass percent of benzene in mixture is 97%

Explanation:

We are given:

Mass percent of naphthalene = 3 %

This means that 3 grams of naphthalene is present in 100 grams of solution

Mass of benzene = Mass of solution - Mass of naphthalene = 100 - 3 = 97 g

To calculate the mass percentage of benzene in mixture, we use the equation:

$\text{Mass percent of benzene}=\frac{\text{Mass of benzene}}{\text{Mass of mixture}}\times 100$

Mass of benzene = 97 g

Mass of mixture = 100 g

Putting values in above equation, we get:

$\text{Mass percent of benzene}=\frac{97g}{100g}\times 100=97\%$

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