Which of the following chemical equations is balanced correctly?

• A. Na + Cl_2 ightarrow 2 NaCl
• B. N_2 + 2 H_2 ightarrow 2 NH_3
• C. 2 H_2 + O_2 ightarrow 2 H_2O
• D. C_3H_8 + 4 O_2 ightarrow 3 CO_2 + 4 H_2O

Answer: (C)

Verified step by step guidance

1. Identify the number of atoms of each element on both sides of each chemical equation to check if they are balanced.
2. For the equation \(\text{Na} + \text{Cl}_2 \rightarrow 2 \text{NaCl}\), count sodium (Na) and chlorine (Cl) atoms on reactants and products sides.
3. For the equation \(\text{N}_2 + 2 \text{H}_2 \rightarrow 2 \text{NH}_3\), count nitrogen (N) and hydrogen (H) atoms on both sides.
4. For the equation \$2 \text{H}_2 + \text{O}_2 \rightarrow 2 \text{H}_2\text{O}$, count hydrogen (H) and oxygen (O) atoms on both sides.
5. For the equation \(\text{C}_3\text{H}_8 + 4 \text{O}_2 \rightarrow 3 \text{CO}_2 + 4 \text{H}_2\text{O}\), count carbon (C), hydrogen (H), and oxygen (O) atoms on both sides.