Question

How many atoms are contained in each of the following?

6.7 g CO2 ?

Answer 1

Number of moles of CO2 = 6.7 g / 44.01 g/mol = 0.152 mole

1 mole of CO2 contains 6.023*10^23 molecules so

0.152 mole of CO2 will contain

= 0.152 mole of CO2 *(6.023*10^23 molecules  / 1 mole of CO2)

= 0.915*10^23 molecules of CO2

1 molecule of CO2 contains 3 atoms so

0.915 *10^23 molecules of CO2 will contain 2.745*10^23 atoms of CO2

Therefore, 6.7 g of CO2 will contain 2.745*10^23 atoms of CO2