1 Mr(ZnO)=65+16=81
w(zn)=65*100%/81=81,2
w(o)=16*100/81=19,3 - 100%
2 Mr(Al2O3)=27*2+16*3=102
w(Al)=54*100%/102=52,9
w(O)=48*100%/102=47,1 - 100%
3 Mr(K2O)=39*2+16=94
w(K)=78*100%/94=83,0
w(O)=16*100/94=17,0 - 100%
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Answers & Comments
1 Mr(ZnO)=65+16=81
w(zn)=65*100%/81=81,2
w(o)=16*100/81=19,3 - 100%
2 Mr(Al2O3)=27*2+16*3=102
w(Al)=54*100%/102=52,9
w(O)=48*100%/102=47,1 - 100%
3 Mr(K2O)=39*2+16=94
w(K)=78*100%/94=83,0
w(O)=16*100/94=17,0 - 100%