calculate the nmber of molecules present in 15 g of P4O10 . answer in units of molec.?

Question

how are the steps?

Answer 1

1) First we need the molecular weight of P4O10:

M(P4O10) = 284 g/mol

2) Second, we must calculate number of moles of P4O10:

n(P4O10) = 15 g / 284 g/mol = 0.0528 moles

3) We use the Avogadro number knowing that is the amount of molecules or particles contained in a mol of substance:

Na = 6.022 x 10^23

# molecules of P4O10 = (0.0528)(6.022 x 10^23) = 3.1806 x 10^22

That's it!

Good luck!