If you find yourself without enough information, make and justify a reasonable assumption. Be sure to answer all parts of a question.

$50kg$ of steam $($water$,H_{2}O)$ is cooled from $500C$ to $300C$ while keeping it at a pressure of $5$ bar. Calculate the change in volume $($a$)$ using the steam tables; $($b$)$ using the ideal gas law. Use the data on the next page as needed. Be mindful of units.