# How to find the formula

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## How to Find Molecular Formula: 13 Steps (with Pictures)

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## Equation Calculator

Let us convert the denominator to 100. (3/20) × (5/5) = 15/100. Now, multiply the result by 100. (15/100) × 100 = 15. Therefore, 3/20 = 15%. Note: This method of calculating the percentage is applicable only when the denominator is a factor

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## Writing a formula from a sequence

To find a molecular formula, start by calculating the number of moles and the molecular weight of the gas using their respective formulas. Then, add together the atomic weight of each of the atoms in the formula, which you can find using the periodic table. Next, divide the molecular weight by the empirical form See more