$1-28.$ Use the data in the steam tables to answer the

following:

A$.$ Find the change in internal energy when $100kg$

of steam at constant pressure $P=1$ bar has its

temperature reduced from $300C$ to $100C.$

B$.$ Find the change in internal energy when $100kg$ of

liquid water at constant pressure $P=200$ bar has

its temperature increased from $240C$ to $300C.$

C$.$ Energy was transferred from the system in part A$,$

and energy was transferred to the system in part

B$.$ What form would you expect these energy

transfers took?

D$.$ Your answers to parts A and B should be similar

in magnitude, though different in sign. Would it

be possible to accomplish both of the processes

in parts A and B simultaneously, by taking most

of the energy that was removed from the steam

described in part A and transferring it to the liq$-$

uid water described in part B$?$