Which chemical equation is balanced? ⚖️

🇫🇷 French Version

Sodium oxidation ⚗️ Word equation:

Sodium + Dioxygen → Sodium oxide
Chemical equations:
A) Na + O2 → Na2O
B) 2Na + O2 → Na2O
C) 4Na + O2 → 2Na2O

Hint 💡:
a) Write the calculations if the multiplication does not involve 1.
A red number, or normal number, multiplied by a blue number, or subscript number.
Example 1: 4×2 = 8
Example 2: For 1×4 = 4, you may answer 4.
b) You may use the symbol * instead of the multiplication sign ×.

📊 RESULT:

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