A steam radiator (used for space heating) has a volume of 20 L and is filled up

Question:

A steam radiator (used for space heating) has a volume of 20 L and is filled up with steam at 200 kPa and 250oC. The inlet and exit ports are then closed. As the radiator cools down to a room temperature of 20oC, determine
(a) the heat transfer (Q) and
(b) reversible work (Wrev).
(c) What-if Scenario: What would the reversible work be if the steam pressure in the radiator were 400 kPa instead?