The mole fraction of benzene in a 100.0g solution containing 30.0g of benzene and 70.0g of water is _____. (molar mass of benzene = 78.11 g/mol and molar mass of water = 18.02 g/mol)

Question

Quizplus · Accepted Answer

First, we need to calculate the moles of each substance in the solution:
moles of benzene = 30.0g / 78.11 g/mol = 0.384 moles
moles of water = 70.0g / 18.02 g/mol = 3.887 moles

The total moles in the solution is the sum of these:
total moles = 0.384 + 3.887 = 4.271 moles

The mole fraction of benzene is then:
moles of benzene / total moles = 0.384 / 4.271 = 0.0900

Therefore, the answer is C) 0.0900.

The Mole Fraction of Benzene in a 100