Question

a sample of phosphorous has 0.5 moles of p4 atoms.calculate:-
(a)how many p atoms are there?
(b)how many moles of p atoms are there?

Answer 1

a) Each mole contains 6.022 x 10 SQR (23) of molecules. Each P₄ molecule contains 4 atoms.
0.5 moles of p4 contain: 0.5 x 6.022 x 10 SQR (23) x 4 = 12.044 x 10 SQR (23) p atoms.

b) As we can see from formula P₄, each mole of it contains 4 moles of atoms P.
So, 0.5 moles of P₄ contain: 0.5 x 4 = 2 moles of P atoms.