Question

Which of the following chemical equations is balanced correctly?

A) 2 H2 + O2 - 2 H2O
B) 3 N2 + 4 H2 - 2 NH3
C) 4 CO2 + 6 H2O - C2H4O2 + 5 O2
D) H2O + CO2 - H2CO3

Answer 1

The balanced chemical equations are CH4(g) + 2O2(g) → CO2(g) + 2H2O(l) and AgNO3(aq) + 2KCl(aq) → AgCl(s) + KNO3(aq). The others are not balanced as they have different numbers of each atom on the reactants and products sides.

Step-by-step explanation:

To determine if a chemical equation is balanced, we need to ensure that the number of atoms of each element is the same on both sides of the reaction. Let's examine the given chemical equations:

• a. 2Na(s) + O₂(g) → 2Na₂O(s) - This equation is not correctly balanced because on the reactant side we have 2 sodium atoms and 2 oxygen atoms, while on the product side we have 4 sodium atoms and 2 oxygen atoms.
• b. CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(l) - This equation is balanced correctly, with each element having the same number of atoms on both sides of the equation.
• c. AgNO₃(aq) + 2KCl(aq) → AgCl(s) + KNO₃(aq) - This equation is also balanced correctly with the same number of each atom on the reactants and products sides.

Among the options provided, the balanced chemical equations are (b) CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(l) and (c) AgNO₃(aq) + 2KCl(aq) → AgCl(s) + KNO₃(aq).