Gram to mole problems

Example $1$: A sample of ammonia gas has a mass of $185\mathrm{.}45$ &$.$ How many moles of ammania are present?

$185\mathrm{.}45(g)NH{i}_{}\frac{1(mol)NH}{17\mathrm{.}03(g)NH}=10\mathrm{.}889606$mol$=10\mathrm{.}890$molNH

Given the masses of various compounds below, calculate aumber moles in each.

$375\mathrm{.}28$ of calcum carbonate, $CaC{O}_3$

$4\mathrm{.}16{10}^{3}mg$ of aluminum nitrate, Al$($NOr$)$s

$14kg$ dimethyl amine, or $NH(C{H}_3)$