Question

0.22g of carbon dioxide are dissolved in 400 cm3 of pure water.

Calculate the concentration in mol/dm3 of the
solution produced.

Answer 1

0.0125mol/dm³

Step-by-step explanation:

Given parameters:

Mass of carbon dioxide = 0.22g

Volume of water = 400cm³

Unknown:

Concentration in mol/dm³ = ?

Solution:

Concentration is the amount of solute dissolved in a solvent.

The formula is expressed as;

Concentration =
`(number of moles)/(volume)`

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

Molar mass of CO₂ = 12 + 3(16) = 44g/mol

Number of moles =
`(0.22)/(44)` = 0.0005mol

Now,

1000cm³ = 1dm³

400cm³ =
`(400)/(1000)` = 0.4dm³

Insert the parameters and solve;

Concentration =
`(0.005)/(0.4)` = 0.0125mol/dm³