How many moles of calcium are there in 5.74 x 1022 atoms of calcium?

0.095 moles of Calcium is there in 5.74 x 1022 atoms of calcium.

Explanation:

       And, 6.023*10^23 atoms of an element is also equal to 1 mole of the             element.

We have,

         (1/(6.023*10^.23)) * 5.74*10^22 moles of calcium

Therefore,

the answer is d.) potassium