Write the formulae for the following and calculate the molecular mass for each one of them.

(a) $\mathrm{KOH}=39+16+1=56 \mathrm{u}$

(b) $\mathrm{NaHCO}_{3}=23+1+12+3 \times 16=84 \mathrm{u}$

(c) $\mathrm{CaCO}_{3}=12+12 \times 3 \times 16=100 \mathrm{u}$

(d) $\mathrm{NaOH}=23+16+1=40 \mathrm{u}$

(e) $\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}=2 \times 12+6 \times 1+16=46 \mathrm{u}$

(f) $\mathrm{NaCl}=23+35.5=58.5 \mathrm{u}$