Question

Determine the number of molecules present in 0.20g of CO2

Answer 1

1 mol = 6.02.10²³ particles (atoms, molecules, ions)

mol CO₂ = 0.2 g : 44 g/mol = 0.0045

molecules = 0.0045 x 6.02 x 10²³ = 2.709 x 10²¹

Answer 2

Here, is the number of moles in the CO2. Substitute 0.20 g for weight and 44 g/mol for molecular weight of the CO2.