Question

Which of the following equations is balanced?

a) 2al 3o2 → al2o3
b) n2
c) 2h2 → 2nh3 ch4 3o2 → co2
d) 2h2o
e) 2fe2o3 3c → 4fe 3co2

Answer 1

Among the equations provided, the only balanced equation is b) CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(l), where there is an equal number of each type of atom on both sides of the equation.

Step-by-step explanation:

To determine if a chemical equation is balanced, we must check if the number of each type of atom on the reactant side (left side) is equal to the number of each type of atom on the product side (right side). Let's examine the given equations:

• a) 2Na(s) + O₂(g) → 2Na₂O(s): This equation is not balanced because there are 4 sodium atoms on the product side, while there are only 2 sodium atoms on the reactant side.
• b) CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(l): This equation is balanced. There is one carbon atom on each side, four hydrogen atoms on each side, and four oxygen atoms on each side.
• c) AgNO₃(aq) + 2KCl(aq) → AgCl(s) + KNO₃(aq): This equation is not balanced because there is one nitrate (NO₃) on the reactant side and one nitrate (NO₃) on the product side, but the potassium atoms are not balanced. There are two potassium atoms on the reactant side (due to 2KCl) and only one on the product side.

Among the equations provided, (b) CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(l) is the only balanced equation.