Question 44
Fill in the blanks

(a) In a chemical reaction, the sum of the masses of the reactants and products remains unchanged. This is called _.

(b) A group of atoms carrying a fixed charge on them is called _.

(c) The formula unit mass of $C a_{3} (P O_{4})_{2}$ is __.

(d) Formula of sodium carbonate is _ and that of ammonium sulphate is ____.

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Solution

(a) Law of conservation of mass
Law of conservation of mass states that mass can neither be created nor be destroyed, hence the mass of reactants = mass of products

(b) Polyatomic ion
Example: $P O_{4}^{3 -}$

(c) (3 x atomic mass of Ca) + (2 x atomic mass of phosphorus) + (8 x atomic mass of Oxygen)
( $3 \times 40 + 2 \times 31 + 8 \times 16 = 310$ )

(d) $N a_{2} C O_{3} a n d (N H_{4})_{2} S O_{4}$

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