Question: how many molecules are present in 1 gram of co2?
Answer: Avagadro's constant is equal to 6.023 x 10^23 so we have 1 x (6.023 x 10^23) molecules present which is 6.023 x 10^23. Using the formula number of moles = Mass/Mr 44/44=1 mole of CO2 present.