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What is the molar mass of water (H2O)?

Practice Questions

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

Questions & Step-by-Step Solutions

What is the molar mass of water (H2O)?
Correct Answer: 18 g/mol
  • Step 1: Identify the elements in water (H2O). There are 2 hydrogen (H) atoms and 1 oxygen (O) atom.
  • Step 2: Find the molar mass of hydrogen. It is 1 gram per mole (g/mol).
  • Step 3: Since there are 2 hydrogen atoms, multiply the molar mass of hydrogen by 2: 1 g/mol x 2 = 2 g/mol.
  • Step 4: Find the molar mass of oxygen. It is 16 grams per mole (g/mol).
  • Step 5: Add the total molar mass of hydrogen (2 g/mol) to the molar mass of oxygen (16 g/mol): 2 g/mol + 16 g/mol = 18 g/mol.
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