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Ar N + 3.Ar H = 14 + 3.1 = 14 + 3 = 17
b.
3.Ar O = 3.16 = 48
c.
ar Ca + Ar C + 3 Ar O = 40 + 3.16 = 40 + 12 + 48 = 100
d.
Ar Fe + Ar S + 4.Ar O + 14.Ar H + 7.Ar O
= 56 + 32 + 64 + 14 + 112
= 278
e.
2.Ar C + 4.ar H + 2 .Ar O
= 24 + 4 + 32 = 60