Question

How many grams of kcl must be added to 75.0 grams of water to produce a solution that is 2.25 molar?

Answer 1

molality= no. of moles/mass of water

no of moles of kcl= 2.25* 0.075

=0.16875 moles

no of moles of kcl= given mass/molar mass

molarmass of kcl= 39+35.5=74.5g

given mass= 0.16875*74.5g

12.5718g