Calculate the number of moles of magnesium present in a magnesium ribbon weighing 12 g. Molar atomic mass of magnesium is 24 g mol-1.


A mole is defined as the mass of the substance which consists of the equal quantity of basic units. A mole fraction indicates the number of chemical elements. One mole of any substance is equal to the value of 6.023 x 1023 (Avagadro number). The number of moles formula is expressed as,

Number of moles = Mass of substance/Mass of one mole

Atomic mass of Mg = 24 g mol-1

24 g of Mg = 1 mol

12 g of Mg = 12/24

12 g of Mg = 0.5 mol

Number of moles of magnesium = 0.5 mol

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