Question: how many atoms are in a gram of calcium?
Answer: Calcium's atomic mass is 40.08amu or 40.08 grams per mole. One mole of calcium contains 6.02 x 10 to the 23rd power(6.02e23) atoms. Take 0.6 grams and divide by 40.08 grams (0.0150) and multiply this factor by 6.02e23. That gives you 3.61e23 atoms.