Question

Calculate the mass percentage of benzene if 22 g of benzene is dissolved in 122 g of carbon tetrachloride.

Hint:

Always add solute and solvent masses to get total solution mass before calculating mass percentage.

Answer 1

Given:
Mass of benzene (solute) = 22 g
Mass of carbon tetrachloride (solvent) = 122 g

Step 1: Write the Formula for Mass Percentage
Mass % of solute = (Mass of solute / Mass of solution) × 100

Step 2: Calculate the Mass of Solution
Mass of solution = Mass of solute + Mass of solvent
Mass of solution = 22 + 122 = 144 g

Step 3: Substitute in the Formula
Mass % of benzene = (22 / 144) × 100

= 0.1528 × 100
= 15.28%

Final Answer:
The mass percentage of benzene in the solution is 15.28%.