A 2.25 g sample of an unknown gas at 63 ∘ C and 1.10 atm is stored in a 1.15 L flask. What is the density of the gas? density: g / L What is the molar mass of the gas? molar mass:

1. Density = 1.96g/L

2. Molar Mass of the gas = 42.61g/mol

Explanation:

1. Mass = 2.25g

Volume = 1.15L

Density = Mass / volume = 2.25/1.15 = 1.96g/L

2. V = 1.15L

P 1.10atm

R = 0.082atm. L/mol / K

T = 63°C = 63 + 273 = 336K

n = ?

PV = nRT

n = PV/RT = (1.1 x 1.15) / (0.082 x 336)

n = 0.046mol

Mass = 1.96g

n = Mass / Molar Mass

Molar Mass = Mass / n = 1.96/0.046

Molar Mass = 42.61g/mol