Нужно расставить коэффициенты.
1) K2S+Pb(NO3)2 → PbS+KNO3
2) Al+O2→ Al2O3
3) Li2O+CO2 → Li2CO3
4) H2CO3 → H2O+CO2
5) ZnCO3 → ZnO+CO2
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