Question

calculate the no of atoms in 1 mole of p4

Answer 1

1 Mole of any element or compound contains Avogadro's number of particles.

Hence one mole of P4 contains 6.022 × 10^23 no. of atoms.
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Answer 2

1 mole of any elements contain 6.022×10^23.

So the number of atom should be 6.022×10^23.

Hope it helps.