A compound is composed of 2.2% hydrogen, 26.6% carbon and 71.2% oxygen. Calculate the empirical formula of the compound. If its molecular mass is 90, find its molecular formula.

Explanation

To solve the problem step-by-step, we will calculate the empirical formula first and then use it to find the molecular formula.

### Step 1: Convert percentages to grams
Assuming we have 100 grams of the compound, the percentages can be directly converted to grams:
- Hydrogen (H): 2.2% of 100 g = 2.2 g
- Carbon (C): 26.6% of 100 g = 26.6 g
- Oxygen (O): 71.2% of 100 g = 71.2 g

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