Let's balance step by step. We'll start with Iron (Fe) Fe2O3 + HCl --> FeCl3 + H2O We have 2 Fe on the left, and only one on the right, so we'll double the Fe on the right Fe2O3 + HCl --> 2FeCl3 + H2O Now we have six Cl on the right, and only one on the left, so we'll multiply the Cl by six on the left Fe2O3 + 6HCl --> 2FeCl3 + H2O Finally, we can balance the water, as we have 6 H and 3 O on the left, and 2 H and one O on the right, so we can triple the H2O on the right Fe2O3 + 6HCl --> 2FeCl3 + 3H2O The equation has been balanced.
The metals are to the left of the line (except for hydrogen, which is a nonmetal), the nonmetals are to the right of the line, and the elements immediately adjacent to the line are the metalloids.
<em><u>An acid is any substance that in water solution tastes sour, changes blue litmus paper to red, reacts with some metals to liberate hydrogen, reacts with bases to form salts, and promotes chemical reactions</u></em><em><u>.</u></em>
This question is incomplete. Luckily, I found the same problem which is shown in the attached picture. To answer the question, we must know how the size and charge affect the lattice energy. The answer is: lattice energy increases with the increasing charge of the ions, and decreasing radius of the atoms. <em>Therefore, the ranking would be: A < B < C</em>.
