Question

20 g calcium ions contain how many calcium ions. One mole of any substance contains 6 x 1023
particles. (Relative atomic mass of calcium is 40]

Answer 1

The molar mass of Calcium is 40 grams per mole.

So,20 grams of Ca2+ ions will be 0.5 moles.

So, it will contain 6.023 X 10^23 X 0.5 = 3.0115 X 10^23 Ca2+ ions in it.