Use the formulas and the steam tables to find the missing property of: and Tdry, total pressure

Question:

Use the formulas and the steam tables to find the missing property of:
and Tdry, total pressure is 100 kPa; repeat the answers using the psychrometric chart
a. = 50%, = 0.010
b. Twet =15C, = 50%
c. Tdry = 25C, Twet = 21C