Mr(Cu2S)= 2Ar(Cu)+Ar(S)=2*64+32=160. w(Cu)= 2Ar(Cu)/ Mr(Cu2S)=128/160=0,8=80%. w(S)=Ar(S)/Mr(Cu2S)=32/160=0,2=20%. Mr(MgO)=Ar(Mg)+Ar(O)=24+16=40.w(Mg)=24/40=0,6=60%.w(O)=16/40=0,4=40%
Mr(Cu2S)= 2Ar(Cu)+Ar(S)=2*64+32=160. w(Cu)= 2Ar(Cu)/ Mr(Cu2S)=128/160=0,8=80%. w(S)=Ar(S)/Mr(Cu2S)=32/160=0,2=20%. Mr(MgO)=Ar(Mg)+Ar(O)=24+16=40.w(Mg)=24/40=0,6=60%.w(O)=16/40=0,4=40%