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2CaO--->2Ca+O2
224g xg
112u---32u
224g---xg
x=224g*32u/112u
x=64g
MCaO=40+16=56g/mol
MO2=32g/mol
2*56gCaO - 32g O2
224g CaO - x
x=64g O2
Liczę na naj:)