(b)
(c)
(Atomic mass of H = 1 u, 0 = 16
u, S = 32 u, C=12u)
Answer:
(a) 
(2x 1+12 + 3x
16)= 2 + 12 + 48
Molecular
mass of
(b)
Molecular mass of
=2 x 12 + 5
x 1 + 16 + 1
= 24 + 5 +
16 + 1 = 46 u
(c)
Molecular mass of 
= 2 + 32 + 64 = 98
u
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