Q. 255.0( 4 Votes )

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

(a) CaCO3

(b) MgCl2

(c) H2SO4

(d) C2H5OH

(e) NH3

(f) Ca(OH)2

Answer :

(a) CaCO3

Atomic mass of Ca = 40


Atomic mass of C = 12


Atomic mass of O = 16


Thus, CaCO3 = 40 : 12 : 16 × 3


= 40 : 12 : 48


Ratio by mass = 10 : 3 : 12


(b) MgCl2:


Atomic mass of Mg = 24


Atomic mass of Cl = 35.5


Thus, the ratio by mass = Mg : Cl x 2


= 24 : 35.5 x 2


= 24 : 71


(c) H2SO4:


Atomic mass of H = 1


Atomic mass of S = 32


Atomic mass of O = 16


Thus, the ratio by mass = 2XH : S : 4XO


= 2 : 32 : 64


= 1 : 16 : 32


(d) C2H5OH


The ratio by mass = 2XC : 6XH : O


= 2X12 : 6 : 16


= 24 : 6 : 16


= 12 : 3 : 8


(e) NH3


The ratio by mass = N : 3 × H


14 : 1


(f) Ca(OH)2


The ratio by mass = Ca : 2XO : 2 × H


= 40 : 32 : 2


= 20 : 16 : 1


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