Question

Calculate the molar mass of
a) sodium sulphate
b) sodium hydrogen carbonate

Answer 1

a) Molar mass of sodium = 23 g mol^-1
Molar mass of sulphur = 32 g mol^-1
Molar mass of oxygen = 16 g mol^-1
$$\begin{gathered} Hence,molarmassofsodiumsulphate\left(N{a}_{2}S{O}_4\right)=2\times 23+32+4\times 16 \\ =142g \end{gathered}$$

b) Molar mass of hydrogen atom = 1 g mol^-1
​Molar mass of carbon = 12 g mol^-1
$$\begin{gathered} Hence,molarmassofsodiumhydrogencarbonate\left(NaHC{O}_3\right)\hspace{0.17em}=23+1+12+3\times 16 \\ =84g \end{gathered}$$