100 mL of 4 M acid is diluted with water to 500 mL. What is the new molarity?
Answer and explanation
Correct answer: B. 0.8 M
- Step 1: Moles stay the same: , so M. Answer: 0.8 M. Why not the others: 20 M, 1.25 M and 2 M don't fit.
Practise more Calculations in chemistry.
Free questions with an explanation for every one, and full timed IOE Engineering Entrance Examination (Tribhuvan University, Nepal) mock tests.
More Calculations in chemistry questions
- 1 mol of a solute is dissolved to make 2 litres of solution. What is the molarity?
- 50 mL of 6 M acid is diluted with water to 1000 mL. What is the new molarity?
- What is the pH of a strong base solution whose hydroxide ion concentration is 10⁻¹ mol/L at 25 °C?
- What volume does 0.25 mol of an ideal gas occupy at STP? (molar volume 22.4 L/mol)
- How many grams of water form when 10 g of hydrogen burns completely in oxygen? (; H = 1, O…
- What is the percentage by mass of sulphur in SO2? (molar mass of SO2 = 64, mass of sulphur in it = 32)