M(CO2) = M(C) + 2 · M(O) = 12 + 2 · 16 = 44 g/mol
CO2:
CO2
6.022 · 1023 molecules
/
44 g
=
x
/
g
→ g
x =
6.022 · 1023 molecules · 30 g
/
44 g
= 4.106 · 1023 molecules of CO2