Question

How many potassium atoms can be found in 0.25 mole sample?

Answer 1

The potassium atoms which can be found in 0.25 moles

by use of Avogadro constant,

1mole = 6.02 x10^23 atoms

what about 0.25 moles, by close multipication

= 0.25 moles /1 mole x(6.02 x10^23) = 1.505 x10^23 atoms