The mass percentage of toluene in a solution containing 100.0 mL of toluene and 200.0 mL of benzene is _____%. (Density of toluene = 0.865 g/mL and density of benzene = 0.875 g/mL)
A) 10.0
B) 25.0
C) 33.1
D) 49.4
E) 86.5

Question

Quizplus · Accepted Answer

First, we need to calculate the total mass of the solution:
Mass of toluene = volume of toluene x density of toluene = 100.0 mL x 0.865 g/mL = 86.5 g
Mass of benzene = volume of benzene x density of benzene = 200.0 mL x 0.875 g/mL = 175.0 g
Total mass of solution = mass of toluene + mass of benzene = 86.5 g + 175.0 g = 261.5 g

Next, we need to calculate the mass of toluene as a percentage of the total mass of the solution:
Mass percentage of toluene = (mass of toluene / total mass of solution) x 100%
Mass percentage of toluene = (86.5 g / 261.5 g) x 100% = 33.1%

Therefore, the answer is C) 33.1.

The Mass Percentage of Toluene in a Solution Containing 100