How many moles are in 15.0 grams of calcium (ca)?

a.) 0.374 moles
b.) 2.67 moles
c.) 601.5 moles
d.) 2.40 x 10 25 moles

The correct answer is option A.) 0.374 moles

Explanation:

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Calcium (Ca) has a mass of 40g / mol

In this case we have 15 g of Ca.

We need to calculate the amount of moles so the operation to be performed is as follows:

mol Ca = 15g * (1mol / 40g) = 0.375 mol

We conclude, after the calculations, that the correct answer is option A.) 0.374 moles

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