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mO₂=32u
2CaO ---> 2Ca + O₂
2*56g CaO ---- 32g tlenu
224g CaO ----- xg tlenu
x = 64g tlenu
2CaO--->2Ca+O2
224g xg
112u---32u
224g---xg
x=224g*32u/112u
x=64g