Q 7.     What is the mass of— 

   (b)     4 moles of aluminium atoms (Atomic mass of aluminium = 27)?

Answers (1)

The atomic mass of Aluminium = 27 u.

Mass of 4 moles of aluminium atoms = 4 x Mass of 1 mole of Al atoms

                                                            = 4 x molecular mass of aluminum atoms in grams

                                                            = 4 x 27

                                                            = 108 g

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