Question

The density (g/L) of CO2 gas at STP ( 273 K, 1.00 atm) is

1.96 g/L
1.43 g/L
1.25 g/L
0.509 g/L

Answer 1

The density : 1.96 g/L

Further explanation

Ideal gas Law

Pv=nRT

where

P = pressure, atm , N/m²

V = volume, liter

n = number of moles

R = gas constant = 0.082 l.atm / mol K (P= atm, v= liter),or 8,314 J/mol K (P=Pa or N/m², v= m³)

T = temperature, Kelvin

so for density,

MW CO₂ = 44 g/mol

`\tt \rho=(P* MW)/(RT)\\\\\rho=(1* 44)/(0.082* 273)\\\\\rho=1.96~g/L`