Update: What is the mass of carbon monoxide(CO) gas if the gas occupies a volume of 4.1 L at 2 atm of pressure and -73 degrees Celsius?

For the carbon dioxide gas :
Volume, V = 4.1 L
Pressure, P = 2 atm
Absolute temperature, T = (273 - 73) = 200 K
Mass = ? g
Molar mass, M = (12.0 + 16.0) g/mol = 28.0 g
Gas constant, R = 0.0821 L atm / (mol K)

PV = nRT and n = m/M
Then, PV = (m/M)RT
Hence, m = PVM/(RT)

Mass, m = 2 × 4.1 × 28.0 / (0.0821 × 200) g = 14 g

The answer : 3) 14 g