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What is the mass of 1 mole of water (H2O)?

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Question: What is the mass of 1 mole of water (H2O)?

Options:

  1. 18 g
  2. 16 g
  3. 20 g
  4. 22 g

Correct Answer: 18 g

Solution: 

The molar mass of water (H2O) is 18 g/mol (2*1 for H + 16 for O).

What is the mass of 1 mole of water (H2O)?

Practice Questions

Q1
What is the mass of 1 mole of water (H2O)?
  1. 18 g
  2. 16 g
  3. 20 g
  4. 22 g

Questions & Step-by-Step Solutions

What is the mass of 1 mole of water (H2O)?
Correct Answer: 18 g/mol
  • Step 1: Identify the chemical formula of water, which is H2O.
  • Step 2: Determine the number of hydrogen (H) atoms in one molecule of water. There are 2 hydrogen atoms.
  • Step 3: Find the atomic mass of hydrogen. It is approximately 1 gram per mole (g/mol).
  • Step 4: Calculate the total mass contributed by hydrogen: 2 hydrogen atoms * 1 g/mol = 2 g/mol.
  • Step 5: Determine the number of oxygen (O) atoms in one molecule of water. There is 1 oxygen atom.
  • Step 6: Find the atomic mass of oxygen. It is approximately 16 grams per mole (g/mol).
  • Step 7: Calculate the total mass contributed by oxygen: 1 oxygen atom * 16 g/mol = 16 g/mol.
  • Step 8: Add the total mass of hydrogen and oxygen together: 2 g/mol (from H) + 16 g/mol (from O) = 18 g/mol.
  • Step 9: Conclude that the mass of 1 mole of water (H2O) is 18 grams.
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