The formula B+ O2_ B2O3 is balanced as

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B + O₂ → B₂O₃

Balance O.

2 on the left, 3 on the right. Add a coefficient of 3 in front of O₂ and a coefficient of 2 in front of B₂O₃.

B + 3O₂ → 2B₂O₃

Balance B.

1 on the left, 4 on the right. Add a coefficient of 4 in front of B.

4B + 3O₂ → 2B₂O₃

Our final balanced equation: 4B + 3O₂ → 2B₂O₃

Hope this helps!

the answer is option a.

you did not give any options thus this is the best answer i can give to you with this little information you have given

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