Question

calculate the mass of sodium which contains same number of atoms as are present in 4 gram of Calcium atomic mass of sodium and Calcium is 23 and 40 respectively

Answer 1

40g ca contains 6.022^23atoms
4g ca contains 6.022× 10^22 atoms

6.022×10^23 atoms are present in 23g of Na
6.022×10^22 atoms are present in 2.3g of Na