Problem

The mass of

1 \text{ m}^3

of air at standard temperature and pressure is about

1.3 \text{ kg}

, about

77\%

of which is

\text{N}_2

and

23\%

\text{O}_2

. a. a i Calculate the mass of

\text{N}_2

1 \text{ m}^3

of air. ii If the molar mass of

\text{N}_2

28 \text{ gmole}^{-1}

, calculate the number of moles of

\text{N}_2

1 \text{ m}^3

of air. iii Hence, calculate the mass of an atom of nitrogen. b. b i Calculate the mass of

\text{O}_2

1 \text{ m}^3

of air. ii If the molar mass of

\text{O}_2

32 \text{ gmole}^{-1}

, calculate the number of moles of

\text{O}_2

1 \text{ m}^3

of air. iii Hence, calculate the mass of an atom of oxygen.