Question

calculate the number of molecules present in 2.2 grams of carbon dioxide

Answer 1

The no. of molecules is 0.3011*10^23.

Answer 2

The molar mass of CO2 is 44 g/mol. So, there are 6.022 * 10^23 molecules of CO2 in 44g.

Hence, in 1 gram, there will be the same number of molecules of CO2 divided by 44.

Now, in 2.2g of CO2, there will be 6.022 * 10^23 * 2.2 / 44 molecules of CO2, which equals 0.3011 * 10^23 molecules.