A45.0l gas cylinder contains 988 he at 23 degrees c what is the pressure inside the cylinder

P = 133.4 atm

Explanation:

Given data:

Mass of helium = 988 g

Volume = 45.0 L

Temperature = 23°C (23+273= 296 K)

Pressure of cylinder = ?

Solution:

Number of moles of helium:

Number of moles = mass/ molar mass

Number of moles = 988 g/ 4 g/mol

Number of moles = 247 mol

Pressure:

PV = nRT

P = nRT/V

P = 247 mol × 0.0821. atm. L/mol. K × 296 K / 45 L

P = 6002.5 / 45 L

P = 133.4 atm