Question

The molarity of a solution containing 4g of Naoh dissolved in 200ml of the solution.

Answer 1

Answer:

Molarity=No of moles of solute/Volume in liters

No of moles of solute=4/40

                                    =0.1 mol

therefore, Molarity=0.1/0.2=0.5 M

Answer 2

Given mass = 4 g

Molar mass of NaOH = 23 + 16 + 1 = 40 g/mol

No. of moles = Given mass / Molar mass = 4 /40 = 0.1 moles

Volume = 200 mL

     In L , 200 / 1000 = 0.2 L

Molarity = No. of moles / Volume (in L)

             = 0.1 / 0.2 = 0.5 mol/L