MHT CET202016 Oct 2020Morning ShiftChemistrySome Basic Concepts of ChemistryActual
What is the molarity of solution containing 3 2 ~g of NaOH (Molar mass 40 ~g ~mol ⁻¹ . In 250 ~cm ³ of water?
Options
- A0.512 ~mol dm ⁻³
- B0.32 ~mol dm ⁻³
- C0.032 ~mol dm ⁻³
- D0.02 ~mol dm ⁻³
Correct answer
B. 0.32 ~mol dm ⁻³
Step-by-step solution
Mass of NaOH (m) = 3.2 g The volume of water (V) = 250 cm3 = 0.25 L Mol. wt of NaOH (m) = 40 g/mol n = 3.2 / 40 = 0.08 Molarity = 0.08/0.25 = 0.32 mol dm-3