Question

Co + HNO3 → Co(NO3)2 + N2 + H2O

Answer 1

Co + HNO3 = Co(NO3)2 + N2 + H2O, баланс:

Co -2e- = Co+2                                               |  2  | 10 | 5 |

2(NO3)- + 12H+ + 10e- = N2 + 6H2O         | 10 |      | 1 |;

5Co + 2(NO3)- + 12H+ = 5Co+2 + N2 + 6H2O;

5Co + 12HNO3 = 5Co(NO3)2 + N2 + 6H2O. 

Answer 2

The balanced equation for the reaction between cobalt (Co) and nitric acid (HNO3) is:

3Co + 8HNO3 → 3Co(NO3)2 + 2NO + 4H2O

In this reaction, cobalt reacts with nitric acid to form cobalt(II) nitrate, nitrogen dioxide gas (NO), and water. The coefficients in the balanced equation indicate the stoichiometric ratios between the reactants and products.