The following data were obtained from experiments to find the molecular formula of benzocaine, a local anaesthetic.
(i) 3.54 g of it gave 8.49 g of `CO_2` and 2.14 g of `H_2O` on complete combustion.
(ii) 2.35 g of it was found to contain 0.199 g of nitrogen.
(iii) The molecular mass of benzocaine was found to be 165 amu.
Find the molecular formula of benzocaine.

Explanation

To find the molecular formula of benzocaine, we will follow these steps:

### Step 1: Calculate the moles of CO₂ produced and determine the mass of Carbon.

Given:
- Mass of CO₂ = 8.49 g
- Molar mass of CO₂ = 44 g/mol

...