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 $Ca_3(PO_4)_2$ is ...............
$(d)$ The formula of sodium carbonate is ............... and that of ammonium sulphate is ...............
$(a)$ 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 $Ca_3(PO_4)_2$ is ...............
$(d)$ The formula of sodium carbonate is ............... and that of ammonium sulphate is ...............
(N/A) Law of conservation of mass.
$(b)$ Polyatomic ion.
$(c)$ The formula unit mass of $Ca_3(PO_4)_2$ is calculated as: $(3 \times 40) + 2 \times (31 + 4 \times 16) = 120 + 2 \times (31 + 64) = 120 + 2 \times 95 = 120 + 190 = 310 \text{ u}$.
$(d)$ The formula of sodium carbonate is $Na_2CO_3$ and the formula of ammonium sulphate is $(NH_4)_2SO_4$.
$(b)$ Polyatomic ion.
$(c)$ The formula unit mass of $Ca_3(PO_4)_2$ is calculated as: $(3 \times 40) + 2 \times (31 + 4 \times 16) = 120 + 2 \times (31 + 64) = 120 + 2 \times 95 = 120 + 190 = 310 \text{ u}$.
$(d)$ The formula of sodium carbonate is $Na_2CO_3$ and the formula of ammonium sulphate is $(NH_4)_2SO_4$.
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