Question

"When the chemical equation Cu2S + O2 → Cu2O + SO2 is balanced, the coefficient for O2 will be:

A. 4
B. 5
C. 6
D. 7"

Answer 1

To balance the chemical equation Cu2S + O2 → Cu2O + SO2, the coefficient for O2 is 2.

Step-by-step explanation:

To balance the chemical equation Cu2S + O2 → Cu2O + SO2, we need to ensure that the number of atoms on both sides of the equation is equal.

Starting with the O2 molecule, we can see that there are 2 oxygen atoms on the reactant side, but only 1 oxygen atom on the product side. To balance this, we need to put a coefficient of 2 in front of O2.

The balanced equation becomes 2Cu2S + 2O2 → Cu2O + 2SO2. Therefore, the coefficient for O2 is 2.