2. Mole Concept

Solved Examples on the Mole Concept

Some solved example questions on the mole concept are provided in this subsection.

Q.1: How many moles of iron are present in a pure sample weighing 558.45 grams?

A.1: The molar mass of iron is 55.845 g/mol. Therefore, the number of moles of iron in the pure sample weighing 558.45 grams is:

= 10 moles.

Q.2: How many molecules of water are present in 36 grams of water?

A.2: The molar mass of water is 18 (approximately). Therefore, 36 grams of water makes up a total of 2 moles. Each mole has 6.022*1023 water molecules. The total number of H2O molecules in 36 grams of water is: 12.044*1023

Q.3: How many grams of carbon can be found in 1 mole of carbon dioxide?

A.3: 1 mole of CO2 contains 1 mole of carbon and 2 moles of oxygen. The molar mass of carbon is 12.0107 g/mol. Therefore, 1 mole of CO2 contains 12.01 grams of carbon and 32 grams of oxygen.

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