Question

How many moles are in a sample of CO2 that contains 8.12⋅1022 of O atoms?

Answer 1

mole is 6.022 times 10 to the 23rd power. There are two atoms of oxygen in every carbon dioxide molecule, and there are 3 moles of carbon dioxide; therefore there are 3.6132 times 10 to the 24th power atoms of oxygen in 3 moles of pure carbon dioxide. 1mole of CO2 contains 6.022× 10^23 molecules of CO2. Wow!