# What is the mass of 6.2 * 10^20 molecules of carbon monoxide?

Mar 26, 2016

First find how many moles are present by comparing with Avogadro's Number: $n = \frac{6.2 \times {10}^{20}}{6.02 \times {10}^{23}} = 0.001$ $m o l$

The molar mass is $12 + 16 = 28$ $g m o {l}^{-} 1$.

To find the mass, $m = n M = 0.001 \times 28 = 0.028$ $g$.