Question

Derive the formula of the following compounds:
a) Lithium sulphide
b) Ammonium sulphate
c) Calcium chloride
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Answer 1

Answer:

a) Lithium sulphide

➡️ Li2S

b) Ammonium sulphate

➡️ (NH₄)₂SO₄

c) Calcium chloride

➡️ CaCl2

Answer 2

Answer:

a) Li₂s

b) (NH₄)₂SO₄

c) CaCl₂

Explanation:

a) Lithium Sulphide

Li¹⁺               S²⁻

cross multiply the Valency

Li₂s

b) Ammonium Sulphate

NH₄⁺               SO₄²⁻

cross multiply the Valency

(NH₄)₂SO₄

c) Calcium Chloride

Ca²⁺          Cl⁻

cross change the Valency

CaCl₂