Chemistry Tutorial



We are given mass in grams of a particular compound. We need to convert it into moles of that compound given the ratio formula and the masses of individual elements.

Sample Problem

A given sample contains 82.3 grams of Magnesium Oxide. Calculate the number of moles present.


From periodic table, we get the following information:
1 mole of Magnesium = 24.31 grams
1 mole of Oxygen = 16 grams

Therefore 1 mole of Magnesium Oxide = 24.31 + 16 = 40.31 grams

Using the formula: moles = mass in grams/molecular mass

We get: moles = 82.3/40.31 = 2.04 moles of Magnesium Oxide.

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