I need help please will mark brainliest

Will you chech and finish these for me, because i am stumped with them.

Africtionless piston-cylinder contains 50 l of saturated liquid r-134a. the piston has a mass and an area resulting in an applied pressure of 500 kpa on the refrigerant. the refrigerant is now heated until its temperature rises to 70∘c. calculate the work (in kj) done during this process.

What is the coefficient of kinetic friction μk between the block and the tabletop?