The balanced full-equation obtained by adding the following two balanced half-reactions is ________.
2H₂O + PH₃ $\rightarrow$ H₃PO₂ + 4H⁺ + 4e^-
I₂ + 2e^- $\rightarrow$ 2I^-

Question

The balanced full-equation obtained by adding the following two balanced half-reactions is ________. 2H₂O + PH₃ $\rightarrow$H₃PO₂ + 4H⁺ + 4e^- I₂ + 2e^- $\rightarrow$2I^-

Quizplus · Accepted Answer

To balance the full equation, the number of electrons lost in the oxidation half-reaction must equal the number of electrons gained in the reduction half-reaction. The first half-reaction produces 4 electrons, and the second half-reaction consumes 2 electrons per molecule of $I_2$, so we need two molecules of $I_2$ to consume the 4 electrons produced. This results in the balanced full equation as shown in option D.

The Balanced Full-Equation Obtained by Adding the Following Two Balanced →\rightarrow→

The Balanced Full-Equation Obtained by Adding the Following Two Balanced $\rightarrow$