Question

What is the mass of 1.6x10^20 molecules of carbon monoxide?

Answer 1

We need to find the mass of 1.6x10^20 molecules of carbon monoxide

First, we must find the number of mol in the 1.6x10^20 molecules

For this, we need to use the avogadro's number ( 6.02*10^23 )

$1.6\cdot10^{20}\cdot\frac{1\text{mol}}{6.02\cdot10^{23}}=2.66\cdot10^{-4}\text{mol}$

Then, we must calculate the molar mass of carbon monoxide

M(CO) = 12 g/mol + 16 g/mol = 28 g/mol

Finally, we must multiply the number of mol by the molar mass to find the mass

$2.66\cdot10^{-4}mol\cdot28\frac{g}{mol}=7.448\cdot10^{-3}g=0.007448g$

ANSWER:

0.007