Question

Find mole of 69 g Na.

Answer 1

23g Na=1mol Na
69=23X3g Na = 1X3mol Na

Answer is 3 Mol.

Answer 2

Gram atomic weight

The gram atomic weight of Na is 23 g

Avogadro's law

1 mole has weight of g molecular weight

Application of the law

1 mole weighs 23 g

23 g implies 1 mole

69 g implies 1 mole × 3 [ Multiplying by 3 ]

69 g hence implies 3 moles

The number of moles is 3

Hope it helps you:-)

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