Determine the molecular formula of an oxide of iron in which the mass per cent of iron and oxygen are 69.9 and 30.1 respectively. Given that the molar mass of the oxide is `159.8 g mol^(-1)`.

Explanation

To determine the molecular formula of the oxide of iron, we will follow these steps:

### Step 1: Determine the mass of iron and oxygen in 100 g of the compound.
Since the mass percentages of iron and oxygen are given as 69.9% and 30.1%, we can assume we have 100 g of the compound. Therefore:
- Mass of iron (Fe) = 69.9 g
- Mass of oxygen (O) = 30.1 g

### Step 2: Convert the masses to moles.
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