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Calcium has an atomic mass of 40 g. Determine how many number of moles are present in 16 grams of calcium.

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1/4 mole

4 mole

0.4 mole

640 mole

answer is A.

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Detailed Solution

One mole of any substance contains a mass of that whole compound. However, in this case, calcium has an atomic mass of 40g. The moles present in 16 g of calcium can be found by using the below formula,

$N o o f m o l e s i n 16 g = \frac{G i v e n m a s s}{T o t a l m a s s}$

$N o o f m o l e s i n 16 g = \frac{16}{40}$

The molecular weight of 16 g calcium is 0.4.

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