Question 449 of 513

Balance: Ca + O2 → CaO

  • Ca + O2 → CaO
  • 2Ca + O2 → 2CaO
  • Ca + O2 → Ca2O2
  • Ca2 + O2 → 2CaO

Correct Answer: B

Explanation
There are 2 oxygen atoms on the left but 1 on the right. Adding 2Ca and 2CaO balances it: 2Ca + O2 → 2CaO.
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