Question

What is the number of zinc atoms in a piece of zinc weighing 10g

Answer 1

6.023×10 to the power of 21 × 10 g is ans

Answer 2

Since it's given that the molar mass of zinc is 65 gram i.e 65gram of zinc constitutes 6.022 x 10^23 atoms or 1 mole of atoms so by unitary method, 1 gram of zinc would have 1/65 moles of zinc and similarly 10 gram of zinc would have 10/65 moles of zinc which is equal to 10 x 6.022 x 10^23 / 65 atoms which is