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  • Find the ratio by mass of the combining elements in the following compounds. (You may use Appendix-III)

Find the ratio by mass of the combining elements in the following compounds. (You may use Appendix-III)

(a) CaCO_{3}  (d) C_{2}H_{5}OH

(b) MgCl_{2}  (e) NH_{3}

(c) H_{2}SO_{4}  (f) Ca(OH)_{2}

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Answer:

(a) CaCO3 \rightarrow Ca: C : O = 40 : 12 : 48 = 10 : 3 : 12
(b) MgCl_{2} \rightarrow Mg : Cl = 24 : 2 \times 35.5 = 24 : 71
(c) H_{2}SO_{4} \rightarrow H : S : O = 2 \times 1 : 32 : 4 \times 16 = 2 : 32 : 64 = 1 : 16 : 32
(d) C_{2} H_{5} OH \rightarrow C : H : O = 2 \times 12 : 6 \times 1 : 16 = 24 : 6 : 16 = 12 : 3: 8
(e) NH_{3}\rightarrow N : H = 14 : 3\times 1 = 14 : 3
(f) Ca (OH)_{2} \rightarrow Ca : O : H = 40 : 2 \times 16 : 2 \times 1 = 40 : 32 : 2 = 20 : 16 : 1

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