Question

14. In an aqueous solution of sulphuric acid,
mole fraction of water is 0.85. The molality
of the solution is
A. 14 m
B. 9.8 m
C. 7.9 m
D. 8.9 m​

Answer 1

Answer:

The solid-vapor curve, labeled AB in Figure 2, indicates the temperatures and pressures at which ice and water vapor are in equilibrium. These temperature-pressure data pairs correspond to the sublimation, or deposition, points for water. If we could zoom in on the solid-gas line in Figure 2, we would see that ice has a vapor pressure of about 0.20 kPa at −10 °C. Thus, if we place a frozen sample in a vacuum with a pressure less than 0.20 kPa, ice will sublime. This is the basis for the “freeze-drying” process often used to preserve foods, such as the ice cream shown in Figure 3.

Explanation: