JEE Main2012ChemistrySome Basic Concepts of ChemistryActual
The concentrated sulphuric acid that is peddled commercial is 95 % H ₂ SO ₄ by weight. If the density of this commercial acid is 1.834 ~g ~cm ⁻³ , the molarity of this solution is
Options
- A17.8 M
- B12.0 M
- C10.5 M
- D15.7 M
Correct answer
A. 17.8 M
Step-by-step solution
95 % H ₂ SO ₄ by weight means 100 ~g H ₂ SO ₄ solution contains 95 ~g H ₂ SO ₄ by mass. Molar mass of H ₂ SO ₄=98 ~g ~mol ⁻¹ Moles in 95 ~g = 95 98 =0.969 mole Volume of 100 ~g H ₂ SO ₄ aligned & = mass density = 100 ~g 1.834 ~g ~cm ⁻³ & =54.52 ~cm ^3=54.52 10⁻³ ~L aligned aligned Molarity & = Moles of solute Volme of solute in L & = 0.969 54.52 10⁻³ =17.8 M aligned