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.

Answer 1

(a)

The gram molecular mass is the sum of the gram atomic masses.

The atomic mass of H is 1 ans O is 16.

$\therefore$ Gram molecular mass = $2\times 1+16$ $=18g$.

(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.