Question

caluculate the number of moles and the number of molecules in 22 g of CO2

Answer 1

You just need the molecular weight of CO2, which you can find by adding up the molecular mass of Oxygen and Carbon in the correct proportions.

(22 g) / (44.01 g/mol) =~ 0.5 mol CO2

Since 1 mole of CO2 is 44 g... and you have 1/2 of a mole, you have one half the number of molecules in one mole; 6.02 x 10^23/ 2. Since there is only 1 carbon atom in each molecule, this is your answer. thus 22gm CO2 has 3.011x10^23 C atoms.

Answer 2

For CO2:

44 g=1 mole.

So, 22 g=22/44=0.5 mole.

44 g = 6.022 x 10^23 molecules.

22 g = 6.022 x 10^23/44 x 22

= 3.011 x 10^23 molecules