Question

how many atoms and molecules of phosphorus are in there in 124 grams of P4?

Answer 1

Atomic mass of phosphorus is 31.

But there are 4 atoms of phosphorus in one molecule of phosphorus.

So mass of 1 molecule of phosphorus =(4x31)amu. = 124 amu.

Given mass= 124 g
number of moles of phosphorus molecules = 124/124 = 1 mole.

One mole contains 6.023 x 10 ^ 23 particles.

So 124 g P4 contains 6.023 x 10^23 molecules
= 6.023x10^23 x 4 atoms
=24.092x 10^23 atoms of phosphorus.

Seems it helps. CHEERS!!!

Answer 2

if mole of p4 molecule =given at /molar at
=124/124=1mole
hence
no of p4 molecules=mole ×Avogadro no
=1×6.023×10^23=6.023×10^23
no of p atoms in p4 =4×mole of p4× Avogadro no

=4×1×6.023×10^23
=24.092×10^23
=2.4092×10^24