2Mg+O2=2MgO
n O2 : n Mg = 1:2 ==> n O2 = 0.05 моль
m O2 = 0.05 * 32 = 1,6 г
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2Mg+O2=2MgO
n O2 : n Mg = 1:2 ==> n O2 = 0.05 моль
m O2 = 0.05 * 32 = 1,6 г