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Chemistry

The ratio of hydrogen and oxygen by mass in a molecule of water is :

  1. 1:16
  2. 2:8
  3. 1:8
  4. 8:1

Water

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Answer

1:8

Reason — One atom of Hydrogen has mass of 1 amu, while one atom of Oxygen has mass of 16 amu. One molecule of water contains 2 atoms of Hydrogen and 1 atom of Oxygen, so their mass ratio:
1 x 2 : 16 x 1 = 1 : 8

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