Which of the following equations is correctly balanced?
Show the answer and explanation
Correct answer
A. 2Na + Cl2 -> 2NaCl
Principle or equation
A balanced chemical equation must have equal numbers of each type of atom on both sides.
Why this answer is correct
Check each option: 2Na + Cl2 gives 2 Na and 2 Cl on left, and 2NaCl gives 2 Na and 2 Cl on right, so it is balanced. Other options have unequal atoms.
Example
For 2Na + Cl2 -> 2NaCl: left has 2 Na, 2 Cl; right has 2 Na, 2 Cl.
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