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
The gram atomic mass of sodium (Na) is 23 g. Thus, 23 g of sodium contains one mole of sodium atoms.
Number of moles= $\frac{G i v e n m a s s}{G r a m a t o m i c m a s s}$
Number of moles of sodium in 69 grams = $\frac{69}{23}$ = $3$ moles.

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