Question

if the following reaction is balanced correctly cu + o₂ → cuo the coefficient in front of cuo is ______. -2 0 1 2

Explanation:

Step1: Balance oxygen atoms

On the left - hand side, there are 2 oxygen atoms in $O_2$. To balance the oxygen atoms in $CuO$, we need 2 moles of $CuO$ since each $CuO$ has 1 oxygen atom. So the un - balanced equation $Cu + O_2
ightarrow CuO$ becomes $Cu+O_2
ightarrow 2CuO$.

Step2: Balance copper atoms

Now, on the right - hand side, we have 2 copper atoms in $2CuO$. So we need 2 moles of $Cu$ on the left - hand side. The balanced equation is $2Cu + O_2
ightarrow 2CuO$.

Answer:

D. 2