CBSE Class 9 Answered

Mole and Gram Atomic Mass: One mole of atoms = 6.022 ×10²³ atoms

                                                                                = Gram atomic mass of an element

                                                                                = 1 gram atom of the element

Mole and Gram Molecular Mass: One mole of molecules = 6.022 ×10²³ molecules

                                                                                           = Gram molecular mass

                                                                                           = 1 gram molecule of the compound

Mole in terms of volume:               One mole of a gas        = 22.4 litres at S.T.P.

Moles of an element = Mass of the element

                                   Atomic mass or GA.W

Moles of a compound = Mass of the compound

                                     Molecular mass or GMW

Mass of one atom = Atomic Mass or GAW

                                      6.022 × 10²³

Mass of one molecule = Molecular Mass or GAW

                                             6.022 × 10²³

Number of molecules = Moles × 6.022 ×10²³

Number of atoms = Moles × 6.022 ×10²³