a) mCu2S=128u+32u=160uCu : S = 128 : 32Cu : S = 4 : 1b) mCuS=64u+32u=96uCu : S = 64 : 32Cu : S = 2 : 1c) mFeO=56u+16u=72uFe : O = 56 : 16Fe : O = 7 : 2d) mFe2O3=112u+48u=160uFe : O = 112 : 48Fe : O = 7 : 3
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a) mCu2S=128u+32u=160u
Cu : S = 128 : 32
Cu : S = 4 : 1
b) mCuS=64u+32u=96u
Cu : S = 64 : 32
Cu : S = 2 : 1
c) mFeO=56u+16u=72u
Fe : O = 56 : 16
Fe : O = 7 : 2
d) mFe2O3=112u+48u=160u
Fe : O = 112 : 48
Fe : O = 7 : 3