Question

How many molecules of CO2 are contained in 4.40g of CO2

Answer 1

6.02 x 10²²molecules

Step-by-step explanation:

Given parameters:

Mass of CO₂ = 4.4g

Unknown:

Number of molecules in CO₂ = ?

Solution:

To find the number of molecules in the given mass, we have to find the number of moles in the compound first;

Number of moles =
`(mass)/(molar mass)`

Molar mass of CO₂ = 12 + 2(16) = 44g/mol

Insert the parameters and solve;

Number of moles =
`(4.4g)/(44g/mol)` = 0.1mol

1 mole of a substance contains 6.02 x 10²³molecules

0.1 mole of CO₂ will contain 0.1 x 6.02 x 10²³molecules

= 6.02 x 10²²molecules