A vertical piston-cylinder assembly contains water. The piston has a mass of 2 kg and a diameter

Question:

A vertical piston-cylinder assembly contains water. The piston has a mass of 2 kg and a diameter of 10 cm. Determine the vertical force necessary on the piston to ensure that water inside the cylinder boils at
(a) 120oC.
(b) 80oC. Assume atmospheric pressure to be 101 kPa.
(c) What-if Scenario: What would the answer in part (a) be if the piston mass were neglected?