Question

Calculate the no. of ATOMS in 69g of sodium atom.

Answer 1

then no of moles = given mass / molecular mass

then Na = 23

no of moles = 69 / 23 = 3

then multiply with avargardo no = 6.022 * 10 -23

then no of atoms = 3 * avargardo no= 12.066 * 10-23