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Calculate the Formula Masses of the Following Compounds : Calcium Chloride Sodium Carbonate - Science

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Short Note

Calculate the formula masses of the following compounds :

  1. Calcium chloride
  2. Sodium carbonate

(Given : Atomic masses : Ca = 40 u ; Cl = 35.5 u ; Na = 23 u ; C = 12 u; O = 16 u)

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Solution

  1. Formula mass of calcium chloride = mass of one Ca atom + mass of two Cl atoms = 40 + 2 × 35.5 = 111
    Thus, the formula mass of calcium chloride is 111 u.
  2. Formula mass of sodium carbonate = mass of two Na atoms + mass of one C atom + mass    of three O atoms = 2 × 23 + 12 + 3 × 16 = 106
    Thus, the formula unit of sodium carbonate is 106 u.
Concept: Molecular Mass
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APPEARS IN

Lakhmir Singh Class 9 Chemistry - Science Part 2
Chapter 3 Atoms and Molecules
Long Answers | Q 30.2 | Page 152

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