Составте электронный баланс:Li+O2=Li2O Mg+CO2=C+MgO
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4Li+O2=2Li2OLi(0) - 1e--> Li(+1)_____4
O2(0) + 4e --> 2O(-2)___1
2Mg + CO2=C + 2MgO
C(+4) + 4e --> C(0)____1
Mg(0) - 2e --> Mg(+2)___2