Lana balanced an equation so that the result was 2 cap c sub 2 cap h sub 3 Br plus 5 cap o sub 2 rightarrow 4 CO sub 2 plus 2 cap h sub 2 cap o plus 2 HBr Which most likely represents the starting equation?

The balanced equation uses 2 C₂H₃Br, 5 O₂, 4 CO₂, 2 H₂O, and 2 HBr. These coefficients are multiples of the corresponding substances in the starting equation, so the starting equation has one of each substance: C₂H₃Br + O₂ → CO₂ + H₂O + HBr. That is choice B.

AI-written and checked against the verified answer.