Question

Find the mass of 3.90*10^23 molecules of carbon dioxide

Answer 1

Answer: 28.5 g

Explanation:

1 mole of every substance contains Avogadro's number of particles and weighs same as it's molecular weight.

Here 1 mole of $CO_2$ contains $6.023\times 10^{23}$ molecules of $CO_2$ and it weighs $44g$

$6.023\times 10^{23}$ molecules weigh 44g

$3.90\times 10^{23}$ molecules weigh = $\frac{44g}{6.023\times 10^{23}}\times 3.90\times 10^{23}$

                                                          = 28.5g

Answer 2

The mass of carbon dioxide is calculted below. Please see the image .