Answer:
The set of coefficient values that correctly balances the reaction between chromium metal and oxygen gas is: 4Cr(s) + 3O₂(g) → 2Cr₂O₃(s)
Step-by-step explanation:
To balance the equation, we need to make sure that the number of atoms of each element is the same on both sides of the equation. In the given reaction, there are 4 chromium atoms (Cr) on the left side and 4 chromium atoms on the right side. This is already balanced. Next, let's balance the oxygen atoms. On the left side, there are 3 oxygen molecules (O₂), which means a total of 6 oxygen atoms. On the right side, there are 6 oxygen atoms in 2 chromium(III) oxide molecules (Cr₂O₃), which is balanced. Therefore, the balanced equation is: 4Cr(s) + 3O₂(g) → 2Cr₂O₃(s) This set of coefficient values ensures that the number of atoms of each element is equal on both sides of the equation, satisfying the law of conservation of mass.