(a) Define polyatomic ions. Write an example.
(b) Calculate the formula unit mass of `CaCO_(3)` (Atomic mass of C=12u, Ca=40u, O=16u)
(c) Calculate the molecular mass of the following
(i) `HNO_(3)` (ii)`CH_(3)COOH`
Atomic mass of H=14N, N=14u, O=16u, C=12u