Question

What do you mean by mole find number of moles in 20g of carbon dioxide

Answer 1

First you need to find relative molecular mass. You can calculate it using relative atomic mass of C and O So

MCO2=12+16×2MCO2=12+16×2

=44gmol−1=44gmol−1

molecular mass of CO2CO2 is 44. Which mean 44 grams of CO2CO2contain Avogadro’s number of atoms. So,

44gmol−1=6.022×1023mol−144gmol−1=6.022×1023mol−1(Avogadro’s number)

442=6.022×10232442=6.022×10232

22g=3.011×102322g=3.011×1023

So 22g of CO2CO2have 3.011×10233.011×1023 CO2CO2molecules.

Since one molecule has one carbon atom it also has 3.011×10233.011×1023 Carbon atoms