Question

calculate the Molecular formula for 27.30% C; 0.69% H; 57.69% I; 5.23% Na; 9.09% O; Moleculate weight=879.86amu

Answer 1

use those percentages as if they were masses, then find the moles of each type of element.

Divide all the values by the smallest value to get a small whole-number ratio. That's the empirical formula.

The molecular formula will be a multiple of the empirical formula that has the same weight as the molecular weight.