Question

calculate the number of mole in 5.75g of sodium atom of Na=23

Answer 1

MM(Na) = 23
GM. = 5.75

no of moles
= GM/MM
=5.75/23
=0.25

Answer 2

we have mass of substance= 5.75g , mass of one mole (Na)= 23

number of moles= mass of substance/mass of one mole

= 5.75/23

=0.25 mole