For problem number 47 once 25% of the steam has condensed do we use the evap. column in the steam table to find the volume and pressure of the new state?
Think about what kind of process this is. It states that the condensation takes place in a rigid vessel. That means that the *overall* molar volume of the system must remain constant. That places a constraint on the overall molar volume of the final state, which is a combination of liquid and vapor molar volumes (via the quality). The other constraint is that the system is on the saturation curve. Those two constraints should help you find the final state, using the steam tables.
You will also need to apply the first law to figure out how the heat removed relates the properties of the system. Note that Delta H = Q / n does not apply here because it is not a constant pressure process.
-MSS
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