The formula unit mass of CaCl2 is:

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RRC Group D Previous Paper 40 (Held On: 15 Oct 2018 Shift 2)
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  1. 105 u
  2. 111 u

  3. 121 u
  4. 100 u

Answer (Detailed Solution Below)

Option 2 :

111 u

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The correct answer is 111 u.

  • The formula unit mass of CaCl2 is 111 u.
  • Atomic Mass of Ca= 40
  • Atomic Mass of Chlorine= 35.5 x2 = 71
  • Formula Unit Mass = 40+71= 111.
  • Formula unit mass is defined as the sum of the mass of all the atoms each multiplied by atomic masses that are present in the empirical formula of a compound.
  • Cacl2 or calcium chloride is also known as Ice Bite.
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