1.

Calculate the number of atoms in 48 g of He?

Answer»

Gram atomic mass of He = 4 g. 

Thus, number of atom sin 4g (1 mol) He = 6.02 × 1023 

So number of atoms in 48 g of He = \(\frac{48}{4}\) x 6.02 × 1023

=12 × 6.02 × 1023 

= 7.224 × 1024



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