Which is greater? 25.0 grams of calcium OR 2.5 x10^24 atoms of calcium (Prove It)
(2.5*10^24)/(6.02*10^23) = 4.15 moles of Ca.
Since the atomic weight of Ca is more than 6, I'd say the atoms win here
Since the atomic weight of Ca is more than 6, I'd say the atoms win here