Do one gram mole of sodium and calcium contain different number of atoms ?

Do 1 mole of sodium and calcium have different number of atoms ?

One gram of which of the following contains largest number of oxygen atoms ?

If one grams of sulphur contains x atoms, calculate the number of atoms in one gram of oxygen element. (Atomic masses : S = 32 u , O = 16 u )

One gram atom of Aluminium contains......atoms