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= 2.1 + 2.12 + 4.16 + 2(2.1 + 16)
= 2 + 24 + 64 + 2(18)
= 90 + 36
= 126
a = 126 kg = 126.000 grm
mol =gr/Mr
= 126.000/126
= 1.000 mol