How many moles of sodium atoms are present in 69 grams of sodium (Na)?

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Solution

The correct option is C 3
Gram atomic mass of sodium = 23 g.
Therefore, 1 mole of Na = 23 g
Number of moles in 23 g of sodium = Given mass/Gram atomic mass.
Number of moles of sodium in 69 grams = 69/23 = 3 moles

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