Question

Помогите расставить коэффициенты :
1) NO2+H2O+O2 = HNO3
2) HCL + Na2S = H2S+ NaCl
3) Cr+Cl2 = CrCl3
4) Na2O +H2O = NaOH

Answer 1

4NO2+2H2O+O2=4HNO3

2HCL + Na2S = H2S+ 2NaCl

2Cr+3Cl2 = 2CrCl3

Na2O +H2O = 2NaOH