If N gains 3 electrons from other atoms, why does it have a -3 charge?

Is 9 correct? and can someone me with 10? it’s due tomorrow, you

16. in a reaction that has reached equilibrium, a. the forward and reverse reactions are occurring at the same rate. b. the reactants and products are in equal concentrations. c. the forward reaction has gone further than the reverse reaction. d. there are equal numbers of atoms on both sides of the equation. e. a, b, and d are correct.

Calculate the concentration of all species in a 0.165 m solution of h2co3.