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Question

Calculate the formula unit mass of CaCl2.


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Solution

The formula unit mass is the sum of the atomic masses of all the atoms present in the formula of the compound multiplied by the number of atoms involved in the compound.

To calculate the formula unit mass of a CaCl2 (Calcium chloride), we should know the following things.

  1. Atomic mass calcium (Ca) = 40 u
  2. Atomic mass of chlorine (Cl) = 35.5 u
  3. Number of atoms of calcium (Ca) = 1
  4. Number of atoms of chlorine (Cl) = 2

Calculations.

Formulaunitmass=(atomicmassofcalciumx1)+(atomicmassofchlorinex2)=(40x1)+(35.5x2)=111amu

Thus, the formula unit mass of CaCl2 is 111 amu.


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