The formula of nitric acid is HNO3\text{HNO}_3HNO3.
What is the relative formula mass, MrM_{\text{r}}Mr, of nitric acid?
The relative atomic mass, ArA_{\text{r}}Ar, of H\text{H}H is 1, of N\text{N}N is 14, and of O\text{O}O is 16.
31
47
63
126