Can I use the ideal gas law for this problem?

Update: If water is in a container and it is 75% vapor and 25% liquid and im only given the pressure. And in its second phase its 100% vapor. How can I calculate the final pressure. Can I use 100 degrees as Temperature 2 in the ideal gas law equation. P1/T1=P2/T2 And then use a value from the steam tables to find T1? Im... show more If water is in a container and it is 75% vapor and 25% liquid and im only given the pressure. And in its second phase its 100% vapor. How can I calculate the final pressure. Can I use 100 degrees as Temperature 2 in the ideal gas law equation. P1/T1=P2/T2 And then use a value from the steam tables to find T1? Im Lost Thanks
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