Themo:water entropy from mass, volume, temp

[deadendcustom]

Homework Statement

Find the entropy (s) of the region
Temperature=300°C
Specific Volume(sv)=2 m^3/kg
Volume(V)=500 m^3

Homework Equations

V/(sv)=M
M=250kg

The Attempt at a Solution

Without the pressure I'm unsure how to look up the entropy from the Steam tables so if anyone has any ideas I'd appreciate it.

thanks

 

[rude man]

Assume constant specific heat between the state at which S = 0 and your state, then integrate.