Question

what do you mean by mole? find number of moles in 20g of carbon dioxide​

Answer 1

mole defined as the amount of a chemical substance that contains exactly 6.02214076×1023 (Avogadro constant) constitutive particles, e.g., atoms, molecules, ions or electrons.

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Answer 2

$\bold{MOLE\: :}$ Mole means the amount of substance containing particles equal to Avogadro's number, i.e., 6.022 × 10²³. The mass of substance containing the same number of fundamental units as there are atoms in exactly 12.000 g of ¹²C is also termed as "MOLE''. SO, 1 mole = 6.022×0²³ particles. These particles can be atoms, molecules, ions, etc.

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$\bold{SOLUTION\:TO\:NUMERICAL :}$

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Molecular mass of CO2 = 44g.

We can also say that,

44 g of CO2 represents 1 mole.

20 g of CO2 represents (20/44) mole or 0.45 mole (approximately).