Answer:
v1 = v2 = 0.0347m³/kg the tank is rigid (constant volume)
P2 = 78.8bar
Explanation:
Assuming ideal gas behavior, the relationship holds for the water vapor
PV = RT/M
Where P = pressure in the tank
V = Specific volume in m³/kg
R = gas constant = 8.314 J/mol•K
T = absolute temperature in K
M = molar mass in kg/mol
The detailed solution steps can be found below in the attachment.
V2 = V1 because the tank is rigid so it is a constant volume process. Also at the final temperature the water molecules are still in the gaseous phase so V2 is still the same as v1.
