Answer:
(a) N =14 (mass number) H = 1
(mass number) Ratio by mass (N : H)= 14 : 1x3 = 14 : 3
(b)
C = 12 (mass
number)
Cl = 35.5
(mass number)
Ratio by
mass (C : Cl) = 12 : 4 x 35.5
= 12 : 142 =
6 : 71
(c)
Ca = 40
(mass number)
C =12 (mass number)
O=16 (mass
number)
Ratio by
mass (Ca : C : O) = 40 : 12 : 16x 3
= 40 : 12 : 48 = 10
: 3 : 12
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