Question

if 1.0 L of a 2.0 M solution contains 1.204 * 10^24 molecules of a solute, how many molecules of solute will 1.0 L of a 0.5 M solution contain?

Answer 1

The formula for molariy is nomber of moles/volume

0.5=n/1=>n=0.5 moles

one mole contains 6.023*10^23 molecules

so 0.5 contain 3.0115*10^23 molecules