Question

mole concept avogadro law calculate the mass of 2.8 litres of carbon dioxide

Answer 1

2.8/22.4=0.125moles , from mole concept 1mol of co2=44g wht about 0.125 moles? 0.125*44=5.5g

Answer 2

22.4 L of CO₂ weigh 44 gm.
So 1 L of CO₂ will weigh 44/22.4 gm.
Hence, 2.8L of CO₂ weighs $\frac{44 x 2.8}{22.4}$
5.5gm