Question

Calculate the number of atoms in
1) 52 moles of He
2)52 g of He​

Answer 1

Explanation:

(1) 1 mole of He = 6.022 × 10²³atoms,

Nom of atoms =52 × 6.022 × 10²³

= 313.144 × 10²³ atoms.

=3.13144×10²⁵ atoms

(2) Atomic mass of He = 4u

No. of moles =52/4

= 13

no. of atoms = 13 ×6.022 × 10²³

=78.286 × 10²³atoms

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