CuO M=64+16=90
Fe2O3 M= 56*2+16*3=160
WO3 M=184+16*3=232
FeO M=56+16=72
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CuO M=64+16=90
Fe2O3 M= 56*2+16*3=160
WO3 M=184+16*3=232
FeO M=56+16=72