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MHgO=216g/mol
n=60g/216g/mol
n=0,28mola
2mol HgO - 1mol O2
0,28molaHgO - xmoliO2
xmoliO2= 0,14mola * MO2(32g/mol) = 4,48gO2
432g ---- 32g
60g --- x
x = 4,(4)g
odp. Powstanie 4,(4) g tlenu:)