Question

question 5
which of the following is used to calculate the vapor pressure lowering of a solution?
density
mole fraction
electronegativity
molar mass

Explanation:

Vapor - pressure lowering is a colligative property. According to Raoult's law, the vapor - pressure lowering ($\Delta P$) of a solution is given by $\Delta P = P^0_A\times X_B$, where $P^0_A$ is the vapor pressure of the pure solvent and $X_B$ is the mole fraction of the solute. So, mole fraction is used to calculate vapor - pressure lowering.

Answer:

B. mole fraction