Question

Calculate the number of molecules in 22g of CO2

Answer 1

44gm co2 contains N molecule
1gm co2 contains N/44 molecule
22gm co2 contains N×22/44 molecule
=N/2molecule, where N=avogaddro number






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Answer 2

molecular mass of CO2 is 44g(12+16*2)
44g of CO2 contains 6.022*10²³molecules
so 1g of CO2 contains 6.022*10²³/44
so 22g of CO2 contains (6.022*10²³)*22/44
=3.011*10²³molecules
hope you understood:-)