Question

The density of carbon dioxide is equal to 1.965 kgm^–3 at 273 K and 1 atm pressure. Calculate the molar mass of CO₂.

Answer 1

Given: The density of CO₂ at 273 K and 1 atm pressure = 1.965 kgm^–3

Molar mass of CO₂ = ?

At 273 K and 1 atm pressure, 1 mole of CO₂ occupies a volume of 22.4 L

Mass of 1 mole of CO₂ = `(1.965  "Kg")/(1  "m"^3) xx 22.4` L

= `(1.965 xx 10^3  "g" xx 22.4 xx 10^(-3) "m"^3)/(1  "m"^3)`

= 44.01 g

Molar mass of CO₂ = 44 gmol^–1