Determine the empirical formula of an oxide of iron which has `69.9%` iron and `30.1%` oxygen by mass. (Atomic mass : Fe = 55.85 amu, O = 16.00 amu).

Explanation

To determine the empirical formula of the oxide of iron with 69.9% iron and 30.1% oxygen by mass, we can follow these steps:

### Step 1: Convert the percentages to grams
Assuming we have 100 grams of the compound, we can directly use the percentages as grams:
- Mass of Iron (Fe) = 69.9 g
- Mass of Oxygen (O) = 30.1 g

### Step 2: Convert grams to moles
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