How many atoms are there in 20.00 moles of calcium (Ca)?

20 x (6.022 x 10^23) atoms in 20 moles of Calcium.

Explanation:

A mole contains 6.022 x 10^23 atoms, which is also known as Avogadro's number, and this number is same for each element. So, there are 20 x (6.022 x 10^23) atoms in 20 moles of Calcium.

Explanation:

i think what you should do is to multiply the mole by avogadros constant which is 6.02times 10rest over 23