Air at 30°C and 150 kPa in a closed container is compressed and cooled. It is found that the first droplet of water condenses at 200 kPa and 15°C. Calculate the percent relative humidity of the original air. The vapor pressures of water at 15°C and 30°C are 1.7051 kPa and 4.246 kPa respectively.

2. At a temperature of 400°C, the specific enthalpy of a water sample is 3100 KJ/kg. What is the phase of the water? a. Solid b. Solid-liquid mixture c. Subcooled liquid d. Saturated liquid e. Saturated mixture f. Saturated vapor g. Superheated vapor For the water in problem 2, determine the following: a. If saturated mixture calculate the quality, x = b. Determine the pressure

This table displays the vapor pressure of nitrogen at several different temperatures. Use the data to determine the heat of vaporization and normal boiling point of nitrogen.Temperature (K)                        Pressure (torr)65                                              130.570                                              289.575                                              570.880                                              102885                                              1718