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Home › Chemistry › Mole Concept

Mole Concept — Chemistry Questions & Practice

Practise 990 Mole Concept questions from Chemistry for competitive exams such as UPSC, Banking, SSC and Railway. Read the worked questions below, check every answer with an explanation, and track what you get wrong.

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Practice questions on Mole Concept — with answers

Try each question first, then open the answer. Explanations are included.

1. What is the number of moles present in 5 g of Water (H2O)? (Molar mass of H2O = 18 g/mol)

  1. A0.469
  2. B0.163
  3. C0.278
  4. D0.778
Show answer

Answer: C

Moles = Mass / Molar mass = 5 / 18 = 0.278 mol.

2. What is the number of moles present in 9 g of Water (H2O)? (Molar mass of H2O = 18 g/mol)

  1. A0.337
  2. B2.5
  3. C0.5
  4. D0.529
Show answer

Answer: C

Moles = Mass / Molar mass = 9 / 18 = 0.5 mol.

3. What is the number of moles present in 11 g of Water (H2O)? (Molar mass of H2O = 18 g/mol)

  1. A0.611
  2. B0.744
  3. C0.65
  4. D5.611
Show answer

Answer: A

Moles = Mass / Molar mass = 11 / 18 = 0.611 mol.

4. What is the number of moles present in 22 g of Water (H2O)? (Molar mass of H2O = 18 g/mol)

  1. A1.222
  2. B0.997
  3. C1.301
  4. D3.222
Show answer

Answer: A

Moles = Mass / Molar mass = 22 / 18 = 1.222 mol.

5. What is the number of moles present in 45 g of Water (H2O)? (Molar mass of H2O = 18 g/mol)

  1. A2.953
  2. B3
  3. C2.5
  4. D2.94
Show answer

Answer: C

Moles = Mass / Molar mass = 45 / 18 = 2.5 mol.

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