Q. 32 B4.9( 8 Votes )

Which has more atoms, 50 g of aluminium or 50 g of iron? Illustrate your answer with the help of calculations.

(Atomic masses: Al = 27 u; Fe = 56 u)

Answer :

Atomic mass of Al = 27u

1 mole of aluminium weighing 27g contains N = 6.022 x 1023 atoms of Al


So, 50g of Al contains = 50 × N(6.022 × 1023)/27 atoms of Al = 11 × 1023 atoms of Al


Atomic mass of Fe = 56 u


1 mole of iron weighing 56g contains N = 6.022 × 1023 atoms of Fe


So, 50g of Fe contains = 50 × N(6.022 × 1023)/56 atoms of Fe = 5 × 1023 atoms of Fe


Thus, 50g of Al has more no. of atoms as compared to 50g of Fe. This is because Aluminium has a smaller atomic mass and is lighter.


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