Question

calculate the molarity of a solution containing 1.0g NaOH in 250ml solution

Answer 1

molar mass of NaOH is 40g/mol . Number of moles =1/40
Molarity= 1×1000/40×250 = 0.1 molar

Answer 2

weight of given solute = 1 g

molecular weight of NaOH =23+1+16 =40 g

Molarity= wt.of given solute x 1000 / molecular wt.of solute x volume of sol.

Molarity= 1 x 1000 / 40 x 250

Molarity= 0.1 mol/l