STD11 CHEMISTRY STD12 CHEMISTRY

Concentration Expressions – Worksheets

June 5, 2025
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By Dr E. Ramanathan PhD

Video Lecture

Calculation of Number of Moles

  1. Calculate the number of moles in 18g of water (H₂O)
  2. Calculate the number of moles in 44g of carbon dioxide (CO₂)
  3. Calculate the number of moles in 10g of hydrogen gas (H₂)
  4. How many moles are there in 58.5g of sodium chloride (NaCl)?
  5. Find the number of moles in 98g of sulfuric acid (H₂SO₄)
  6. Determine the number of moles in 32g of oxygen gas (O₂)
  7. Calculate the number of moles in 12g of carbon (C)
  8. Calculate the number of moles in 160g of ozone (O₃)
  9. Find the number of moles in 27g of aluminum (Al)
  10. Determine the number of moles in 24g of magnesium (Mg)
  11. Calculate the number of moles in 4g of helium (He)
  12. Find the number of moles in 71g of chlorine gas (Cl₂)
  13. Calculate the number of moles in 2g of hydrogen gas (H₂)
  14. Find the number of moles in 90g of glucose (C₆H₁₂O₆)
  15. Determine the number of moles in 36.5g of hydrochloric acid (HCl)

Key

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Worksheet-2

Mole Concept

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Chemistry Worksheet: Mole Concept – Conceptual Questions

  1. Define a mole in terms of Avogadro’s number.
  2. What is Avogadro’s number and what does it represent?
  3. How many particles are present in 2 moles of a substance?
  4. If you have 1 mole of oxygen molecules (O₂), how many oxygen atoms do you have?
  5. Explain the relationship between moles, mass, and molar mass.
  6. How many moles are there in 3.01 × 10²³ molecules of water?
  7. What is the molar mass of NaOH and how is it calculated?
  8. Determine the number of atoms in 0.5 moles of helium.
  9. How is the number of moles calculated from the given volume of a gas at STP?
  10. What volume will 2 moles of an ideal gas occupy at STP?
  11. How many molecules are present in 5 grams of CO₂?
  12. What is the mass of 1 mole of glucose (C₆H₁₂O₆)?
  13. How do you calculate the number of moles from number of particles?
  14. If 0.25 moles of a compound contains 1.505 × 10²³ molecules, identify the compound.
  15. Compare the number of atoms in 1 mole of hydrogen gas and 1 mole of helium.

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Weight by weight percentage problems

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Chemistry Worksheet: Weight by Weight Percentage – Practice Problems

  1. Calculate the w/w % of salt in a solution containing 10g of salt dissolved in 90g of water.
  2. A solution contains 15g of glucose in 85g of water. Find the w/w %.
  3. 25g of NaCl is dissolved in 225g of water. Determine the w/w % of NaCl.
  4. Find the w/w % of a solution made by mixing 12g of sugar with 88g of water.
  5. Calculate the w/w % of ethanol in a solution of 40g ethanol in 160g water.
  6. A 200g solution contains 30g of solute. Find the w/w %.
  7. What is the w/w % of 5g urea in 95g of water?
  8. A solution contains 60g of solute in 240g of solvent. Determine the w/w %.
  9. 18g of acid is mixed with 82g of water. Calculate the w/w %.
  10. In a 500g solution, 75g is solute. What is the w/w %?
  11. Find the w/w % of 50g salt in 150g of water.
  12. A sample has 20g of NaOH in 180g of water. Determine the w/w %.
  13. Calculate the w/w % of 10g of KNO₃ dissolved in 90g of water.
  14. A solution contains 120g of glycerol in 380g of water. What is the w/w %?
  15. What is the w/w % of a solution containing 8g of solute in 92g of solvent?

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Weight by Volume Percentage

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Chemistry Worksheet: Weight by Volume Percentage – Practice Problems

  1. Calculate the w/v % of 5g NaCl dissolved in 100 mL of solution.
  2. A solution contains 10g of glucose in 250 mL of solution. Find the w/v %.
  3. 15g of urea is present in 300 mL of solution. Determine the w/v %.
  4. What is the w/v % of a solution containing 2g KCl in 50 mL of solution?
  5. Calculate the w/v % of 25g sugar in 500 mL solution.
  6. A 200 mL solution contains 8g of solute. Find the w/v %.
  7. Determine the w/v % for 18g of HCl in 300 mL of solution.
  8. 12g of salt is dissolved to make 100 mL solution. Calculate the w/v %.
  9. What is the w/v % of 20g NaOH in 250 mL of solution?
  10. A solution has 3g of acetic acid in 75 mL of solution. Find the w/v %.
  11. 40g of ethanol is dissolved in 400 mL of solution. Calculate the w/v %.
  12. Find the w/v % for 6g of solute in 150 mL solution.
  13. 10g of CaCl₂ is present in 200 mL solution. Determine the w/v %.
  14. What is the w/v % of 1g of KMnO₄ in 100 mL of solution?
  15. A 500 mL solution contains 50g of solute. Find the w/v %.

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Molarity

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Chemistry Worksheet: Molarity – Practice Problems

  1. Calculate the molarity of a solution containing 5 moles of NaOH in 2 liters of solution.
  2. Find the molarity of 0.5 moles of HCl in 250 mL of solution.
  3. What is the molarity of a solution with 10g of NaOH dissolved in 500 mL of solution? (Molar mass = 40 g/mol)
  4. Calculate the molarity of 4.9g of H₂SO₄ in 1 liter of solution. (Molar mass = 98 g/mol)
  5. Determine the molarity of 20g of KOH in 2 liters of solution. (Molar mass = 56 g/mol)
  6. A solution contains 63g of HNO₃ in 500 mL. Find the molarity. (Molar mass = 63 g/mol)
  7. What is the molarity of a solution with 111g of CaCl₂ in 1.5 L of solution? (Molar mass = 111 g/mol)
  8. 4 moles of H₂SO₄ are dissolved in 2 liters of solution. Calculate the molarity.
  9. Calculate the molarity of 27g of AlCl₃ in 450 mL solution. (Molar mass = 133.5 g/mol)
  10. Find the molarity of 16g of NaOH in 250 mL of solution. (Molar mass = 40 g/mol)
  11. What is the molarity of 9.8g of H₂SO₄ in 250 mL solution? (Molar mass = 98 g/mol)
  12. Determine the molarity of 2.5 moles of K₂SO₄ in 1 liter of solution.
  13. A solution contains 0.2 moles of HCl in 100 mL. Calculate its molarity.
  14. 0.1 moles of solute is dissolved in 250 mL of solution. What is the molarity?
  15. What volume of 1 M NaCl solution contains 0.5 moles of NaCl?

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