Answer:

Explanation:
For this question, we must use Dalton's Law of Partial Pressures:
The partial pressure of a gas in a mixture of gases equals its mole fraction times the total pressure:

Data:
χ = 0.7808

Calculation:

B. What could be done to move the boxcar is the answer
The freezing point depression can be explained in terms of vapor pressure adding solvent will decrease molecules