Question

X$H_{2}S{O}_4$+Y$S{O}_2$+Z$N{a}_{2}Cr{o}_4$ $⟶$$C{r}_2(S{O}_4{)}_3$) +A$N{a}_{2}S{O}_4$+B$H_{2}O$X,Y,Z,AandB are?

• A. 2, 3, 2, 2, 2
• B. 2, 2, 2, 2, 2
• C. 4, 3, 2, 1, 0
• D. 0, 1, 2, 3, 4

Answer 1

The correct option is A

2, 3, 2, 2, 2

1. The first step is to assign oxidation numbers to all atoms/ions and look for the numbers that change. Circle or highlight the oxidation numbers that change.

2. Specify the change in the number of electrons per molecule

3. Determine the simplest whole numbers that will balance the number of electrons transferred for each reactant. The numbers become the coefficients for the reactants.

4. Balance the rest of the reaction as usual.