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b)BaO 137/16
c) CaCl2 40/35,5*2 = 40/71
d) Fe2O3 56*2/16*3 = 112/48 = 14/6
e)MgS 24/32 = 3/4
f) AlBr3 27/80*3 = 27/240 = 9/80
g)CO2 12/16*2 = 12/32= 3/8
h) SI2 32/127*2=16/127
i) SO2 32/32= 1/1
j) OF2 16/19*2 = 8/19