Question

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

Answer 1

The mole is the amount of substance that contains the same number of particles (atoms/ion/molecular/formula units etc.) as there are atoms in exactly 12th of carbon- 12

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see

44g of Carbon dioxide =1 mole

Then, 20g of carbon dioxide = 20/44 mole = 0.45