Question

Select the correct answer. Which of the following is a correctly balanced equation? A. NaClO3 → NaCl + 3O2 B. 2HgO → 2Hg + O2 C. 2ZnS + O2 → 2ZnO + 2SO2 D. 4CO + Fe3O4 → 4CO2 + Fe E. 2Fe + 2Cl2 → 2FeCl3

Answer 1

The right answer is 2HgO → 2Hg + O2

Balancing a balance equation consists of finding the right stoichiometric coefficients. These coefficients (placed in front of each molecule) balance the number of each of the different atoms involved during a chemical reaction.

In this reaction, we find on both sides the same number of atoms: two oxygen atoms and two atoms of mercury.