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Lana balanced an equation so that the result was 2C2H3Br + 5O2 → 4CO2 + 2H2O + 2HBr. Which most likely represents the starting equation?

2C4H3Br + 5O2 → 4CO2 + 2H2O + 2HBr
C2H3Br + 5O2 → 4CO2 + H2O + 2HBr
C4H3Br + O2 → CO2 + H2O + HBr
C2H3Br + O2 → CO2 + H2O + HBr
Answered by ;)
the 4th one C2H3Br + O2 → CO2 + H2O + HBr
Answered by GPT-5 mini
C2H3Br + O2 → CO2 + H2O + HBr

Reason: The balanced equation 2 C2H3Br + 5 O2 → 4 CO2 + 2 H2O + 2 HBr is just the unbalanced skeleton with all coefficients multiplied by 2, so the original (starting) equation had each formula with coefficient 1.