Question

which equation is balanced?
miss zoo was wading in the pool.
the victim was not attacked by a cougar.
coach physics was drinking water in the atrium.
there was no venomous bite involved.
al + cuo → al₂o₃ + cu
2al + cuo → al₂o₃ + 3cu
al + 3cuo → alo + 3cu
2al + 3cuo → al₂o₃ + 3cu

Explanation:

Step1: Check the number of atoms for each element in the first equation

• For Al: Left side has 2 atoms, right side has 2 atoms.
• For Cu: Left side has 3 atoms, right side has 3 atoms.
• For O: Left side has 3 atoms (from 3CuO), right side has 3 atoms (from \(Al_2O_3\)).

Step2: Check the number of atoms for each element in the second equation

• For Al: Left side has 1 atom, right side has 2 atoms. So it is un - balanced.

Step3: Check the number of atoms for each element in the third equation

• For Cu: Left side has 1 atom, right side has 3 atoms. So it is un - balanced.

Step4: Check the number of atoms for each element in the fourth equation

• For Cu: Left side has 1 atom, right side has 1 atom. But for the overall stoichiometry, it is not balanced as per the correct ratio of reactants and products for the reaction between Al and CuO.

Answer:

\(2Al + 3CuO
ightarrow Al_2O_3+3Cu\)