What is the molar mass of water (H2O)?

JAMB Chemistry 2023 54 views

What is the molar mass of water (H2O)?

  1. 18 g/mol ✓
  2. 22 g/mol
  3. 16 g/mol
  4. 12 g/mol

Explanation

Step 1: Identify the atoms in water
Water has the formula H₂O, meaning it contains:
– 2 hydrogen (H) atoms
– 1 oxygen (O) atom

Step 2: Find the atomic mass of each element
Hydrogen (H) = 1 g/mol
Oxygen (O) = 16 g/mol

Step 3: Calculate total molar mass
Molar mass = (2 × 1) + (1 × 16)
= 2 + 16 = 18 g/mol

Remember: Molar mass tells you the mass of one mole of a substance. For water, one mole weighs 18 grams.

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