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

The correct option is option D which is C2H3Br + O2 → CO2 + H2O + HBr.

Explanation:The balanced equation is: 2C2H3Br + 5O2 → 4CO2 + 2H2O + 2HBrIn the equation one reactant is C2H3Br. But in option 1 and 3 reactant is C4H3Br which is changed from balanced equation.So option 1 and 3 are rejected on the bases of reactant change.Now equations of option 2 and 4 can be correct.In option 2, there are already coefficient with some reactant and products. So it can be less probable original equation.Equation of option 4 is correct one which is correct without coefficients.

Hi; /c