1. Find the total mass of the solution:

* Total mass = mass of benzene + mass of carbon tetrachloride

* Total mass = 14.2 g + 28.0 g = 42.2 g

2. Calculate the percent by mass of benzene:

* Percent by mass = (mass of benzene / total mass of solution) * 100%

* Percent by mass = (14.2 g / 42.2 g) * 100%

* Percent by mass = 33.65% (approximately)

Therefore, the percent by mass of benzene in the solution is approximately 33.65%.