Question

Find the number of moles in the following

(i) 50g of H₂O

(ii) 7g of Na

( H = 1, O = 16, Na = 23)

Answer 1

Answer:

$1.moles = \frac{weight}{gram \: molecular \: weight}$

$moles = \frac{50}{18}$

$moles = 2.77 \: moles$

$2.moles = \frac{7}{23}$

$moles = 0.304 \: moles$