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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.
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User AldoT
by
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1 Answer

6 votes

Answer:

Mass = 19.85 g

Step-by-step 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

User Carl Yuheng Ren
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