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1. __ZnS + __HCl → __ZnCl2 + __H2S

2. __HCl + __Cr → __CrCl2 + __H2

3. __Al + __Fe3O4 → __Al2O3 + __Fe

4. __H2 + __Br2 → __HBr

5. __Na2S2O3 + __I2 → __NaI + __Na2S4O6

6. __LaCl3 + __Na2CO3 → __La2(CO3)3 + __NaCl

7. __NH4Cl + __Ba(OH)2 → __BaCl2 + __NH3 + __H2O

8. __Ca(OH)2 + __H3PO4 → __Ca3(PO4)2 + __H2O

9. __C4H10 + __O2 → __CO2 + __H2O

10. __C7H6O2 + __O2 → __CO2 + __H2O

1 answer

Here are the balanced equations for the given reactions:

  1. ZnS + 2 HCl → ZnCl2 + H2S

  2. 2 HCl + Cr → CrCl2 + H2

  3. 3 Al + Fe3O4 → Al2O3 + 3 Fe

  4. H2 + Br2 → 2 HBr

  5. 2 Na2S2O3 + I2 → 4 NaI + Na2S4O6

  6. 2 LaCl3 + 3 Na2CO3 → La2(CO3)3 + 6 NaCl

  7. 2 NH4Cl + Ba(OH)2 → BaCl2 + 2 NH3 + 2 H2O

  8. 3 Ca(OH)2 + 2 H3PO4 → Ca3(PO4)2 + 6 H2O

  9. 2 C4H10 + 13 O2 → 8 CO2 + 10 H2O

  10. 2 C7H6O2 + 15 O2 → 14 CO2 + 6 H2O

These balanced equations ensure conservation of mass, reacting the proper molar ratios of reactants to yield the specified products.