Oblicz stosunek masowy pierwiastków w a)bromku wapnia b)tloenku żelaza (III)
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Ca=40u
Br2=80*2=160
stosunek Ca:Br2
40:160
1:4
b)tlenek żelaza (III) Fe2O3
Fe2=56*2=112u
O3=16*3=48u
stosunek Fe2:O3
112:48
56:24
28:12
14:6
7:3