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How to find the empirical formula?

How to find molecular formula from empirical formula?

  • I got the empirical formula, now what do I do to get the molecular formula?

  • Answer:

    Step 1: Determine the molecular mass in grams. Step 2: Divide the molecular mass of the compound (µ) by the molecular mass (g) of the empirical formula. Step 3: Round the quotient to the closest integer. Step 4: Multiply the rounded number by all the subscripts, using the product as the new subscripts. Example: A compound has an empirical formula of CH2 and a molecular mass of 42µ. Determine its molecular mass. Step 1: Carbon = 12 + Hydrogen = 2(1.01) Molecular Mass (g) = 14.02 Step 2: 42 ÷ 14.02 = 2.999 Step 3: 3 Step 4: CH2 • 3 = C3H6

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A molecular formula is the same as or a multiple of the empirical formula, and is based on the actual number of atoms of each type in the compound. For further complete explanation, please check this website out: http://pages.towson.edu/ladon/empiric.html

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