2) Faça o balanceamento das seguintes equações:a) __CaCO3 + __NaCl ® __Na2CO3 + __CaCl2 b) __CH4 + __O2 → __CO2 + __H2Oc) __N2O5 + __K2O2 ® __KNO3 + __O2 d) __Al2(SO4)3 + __Ca(OH)2 → __Al(OH)3 + __CaSO4
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