A piston is filled with 80.4 liters of chlorine gas, Cl (8), at standard temperature and pressure (STP.) What is the mass of chlorine in the piston?
The molar mass of Cl2(g) is 70.9 g/mol.
Type your answer

Mass = 19.85 g

Explanation:

Given data:

Volume of chlorine gas = 80.4 L

Temperature = standard = 273.15 K

Pressure = standard = 1 atm

Mass of chlorine = ?

Molar mass of chlorine gas = 70.9 g/mol

Solution:

PV = nRT

R = general gas constant = 0.0821 atm.L/mol.K

By putting values,

1 atm × 80.4 L = n× 0.0821 atm.L/mol.K  × 273.15 K

80.4 atm.L = n× 22.43 atm.L/mol

n = 22.43 atm.L/mol / 80.4 atm.L

n = 0.28 mol

Mass of Cl₂:

Mass = number of moles × molar mass

Mass = 0.28 mol × 70.9 g/mol

Mass = 19.85 g

the atomic mass is the bottom number on the element.

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