Question

Calculate the mole of 0.0018g of h2o

Answer 1

moles=wt/molar mass
=0.0018/18
=0.0001

Answer 2

molecular mass of H2O= 2 x 1+ 16= 18
number of moles in 0.0018 g of H2O=
$\frac{0.0018}{18} \\ = \frac{18}{18 \times 10000} \\ = \frac{1}{ {10}^{4} } \\ = {10}^{ - 4} moles \\ or \: 0.0001 \: moles$