1.4 Gram Atomic Mass, Gram Molecular Mass and Gram Formula Mass

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Gram Atomic Mass, Gram Molecular Mass and Gram Formula Mass

As we know that all substances are made up of atoms, molecules or formula units. Their masses are referred to as atomic mass, molecular mass and formula mass respectively and are expressed in amu. But these masses can also be expressed in other units as well. When masses are expressed in grams, they are termed as following:

  • Gram atomic mass 
  • Gram molecular mass
  • Gram formula mass

Gram Atomic Mass

The atomic mass of an element expressed in grams is called gram atomic mass or gram atom. It is also called a mole.

1 gram atom of hydrogen = 1.008 g = 1 mole of hydrogen atoms

1 gram atom of carbon = 12.0 g = 1 mole of carbon atoms

It means that 1 gram atom of different elements has different masses.

Gram Molecular Mass

The molecular mass of an element or a compound expressed in grams is called gram molecular mass or gram molecule. It is also called a mole.

1 gram molecule of H2 = 2.0 g = 1 mole of hydrogen molecule

1 gram Molecule of H2O = 18.0 g = 1 mole of water

1 gram Molecule of H2SO4 = 98.0 g = 1 mole of sulfuric acid

Gram Formula Mass

The formula mass of an ionic compound expressed in grams is called gram formula mass or gram formula. It is also called a mole.

1 gram formula of NaCl = 58.5 g = 1 mole of sodium chloride

1 gram formula of CaCO3 = 100 g = 1 mole of calcium carbonate

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Hello, this is Misbah ud Din a student of STEM. This is my blog chemisTREEpk which provides a vast knowledge about Chemistry(and sometimes other sciences) fully free.

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