Quick Physics Question...?

Question

The volume of an ideal gas is adiabatically reduced from 200 L to 74.3 L. The initial pressure and temperature are 1.00 atm and 300 K. The final pressure is 4.00 atm. a) Is the gas monatomic, diatomic or polyatomic? b) What is the final temperature? c) How many moles are in the gas?

Answer 1

PV = nRT

a) insufficient data

b)
T/300 = (4/1)(74.3/200)
T = 445.8°K

c)
(1 atm)(200 L) = n(0.082057 L·atm·mol−1·K−1)(300 K)
n = 8.1244 mol.