Thermodyamics questions?

Question

A cylinder with a 16-cm-diameter piston contains gas at a pressure of 3.0 atm.
Part A
How much force does the gas exert on the piston?
Part B
How much force does the environment exert on the piston?
Part C
The gas expands at constant pressure and pushes the piston out 10 cm. How much work is done by the environment?
Part D
How much work is done by the gas?

Answer 1

1atm = 9.8692 E−6 PA (Pascals) [or N/m^2]
A. F=PA
F= 3x9.8692 E−6 [pi(.16)^2/4]=5.95E-7=6.0 E-7 N
B. F=P(atm)A
F= 1x9.8692 E−6 [pi(.16)^2/4]=2.0 E-7 N
C. W=Fd
W=2.0 E-7 x 0.1= 2.0E-8 J
D. W= Fd=
W=6.0 E-7 x 0.1= 6.0E-8 J