One kilogram of steam is placed in a piston$-$cylinder device, initially at $P=1$ bar and $T=100C.$ The steam is heated at constant pressure to $T=200C.$

A$.$ Find the heat and work for this process. Obtain all needed data from the steam tables.

B$.$ Find the heat and work for this process. Use the ideal gas law and the ideal gas heat capacity for steam, located in Appendix D$.$ How far off are your answers compared to part A$?$

C$.$ Suppose in part A you had overlooked the fact that the steam expands when heated, and assumed that work was negligible. How far off would your answers for $Q$ have been?