Question

What is the density of carbon dioxide at STP? (C=12.01g/mol; O=16.00g/mol)

Answer 1

`"0.00195 g/cm"^3`

Explanation:

The molar mass of `CO_2` is `"12.01 g/mol" + 2*"16 g/mol" = "44.01 g/mol"`

At S.T.P, the molar mass of `CO_2` occupies `"22.4 L" = "22400 cm"^3`, i.e. `"1 mol"` occupies `"22400 cm"^3`

So, the density of `CO_2` at S.T.P is

`= "44.01 g"/("22400 cm"^3) = "0.00195 g/cm"^3`