Question

formula of no of moles

Answer 1

number of moles in a given compound =
$\frac{weight \: of \: the \: given \: compound}{gram \: molecular \: weight \: of \: the \: compound}$
for example number of moles in 73 grams of HCl
GmWt of HCl=36.5
$n = \frac{73}{36.5} = 2$
hope it helps.

Answer 2

no. of moles = mass of element / molar mass of element