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Question

(a) Calculate the gram molecular mass of water from the values of gram atomic mass of hydrogen and of oxygen.
Gram atomic mass of hydrogen =1g
Gram atomic mass of oxygen =16g
(b) Atoms and molecules are the building blocks of matter. List out any three differences between them.

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Solution

(a)
The gram molecular mass is the sum of the gram atomic masses.
The atomic mass of H is 1 ans O is 16.
Gram molecular mass = 2×1+16 =18g.
(b)
  • Atoms are tiny particles that make up the universe, while molecules are made from atoms
  • Atoms make up elements whereas molecules make up compounds.
  • Molecules are made of atoms. Atoms are made of protons, neutrons, and electrons.

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