Question

A solution containing 1.15 mol benzene dissolved in carbon tetrachloride has a concentration of 0.86 m. How many kilograms of carbon tetrachloride must the solution contain?

Answer 1

Molality (m)= moles solute/ kg of solvent

In this case,

0.86 m= 1.15 moles of benzene/ Kg of carbon tetrachloride

kg of CCl4= 1.15 mole/ 0.86 m= 1.34 Kg

Answer 2

Answer: The mass of carbon tetrachloride must be 1.34 kg.

Step-by-step explanation:

Molality is defined as the number of moles of a substance present in a 1 kilogram of a solution.

Mathematically,

`Molality=\frac{\text{Number of moles of substance}}{\text{Mass of solution (is kg)}}`

We are given:

Molality of a solution = 0.86 m

Number of moles of substance = 1.15 mol

Putting values in above equation, we get:

`0.86=\frac{1.15mol}{\text{Mass of solution (is kg)}}\\\\\text{Mass of the solution}=1.34kg`

Hence, the mass of carbon tetrachloride must be 1.34 kg.