Question

the number of atoms present in 0.4 mole of calcium


with proper answer

Answer 1

of Cu moles=0.4/40=1/00=0.01moles. We know that 1 mole of any substance contains 6.023 x 10²³ atoms/ molecules/ions. 1mole of Cu contains=6.023 x 10²³ atoms of Cu. 0.01 mole of Cu contains =6.023 x10²¹ atoms of calcium.