Question

How many atoms of sodium are in 2.3 g of sodium?

Answer 1

given wt. / atomic wt. = no. of atoms / avogadros constant

2.3/23 = no. of atoms / 6.022 × 10^23

1/10 = no. of atoms / 6.022×10^23

6.022×10^22

Answer 2

2.3×10^23
Mass of 1 mole of sodium is 2.3 g.
2.3 g of sodium gas contain 6×10^23 molecules.
therefore 2.3g contains sodium
2.3×10^23 atom . Ans.