High School

A solution contains 0.155 mol of Ca(NO3)2 and 0.981 mol of H2O. Calculate the vapor pressure of the solution at 55°C. The vapor pressure of pure water at 55°C is 118.1 torr. (Assume that the solute completely dissociates.)

Express your answer with the appropriate units:

a) 115.3 torr
b) 110.2 torr
c) 105.6 torr
d) 98.1 torr

Answer :

Final answer:

To find the vapor pressure of the solution at 55°C given the concentrations of Ca(NO3)2 and H2O, use Raoult's Law and the van 't Hoff factor. The vapor pressure of the solution at 55°C is 115.3 torr.

Explanation:

The vapor pressure of the solution can be calculated using Raoult's Law and the van 't Hoff factor. First, determine the molality of the solution using the given data. Then, find the vapor pressure of the solution using the equation for the vapor pressure of the solution.

The vapor pressure of the solution at 55°C is 115.3 torr (option a).

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