39.3 grams of c6h6 are allowed to react with 108.3 grams of o2. How much co2 will be produced by this reaction?

Answer 1

The is a limiting reagent (LR) problem and you know that because amounts are given for BOTH reactants.

1. Write and balance the reaction. The products are CO2 and H2O.

2. Convert grams C6H6 (use caps) to mols. mols = grams/molar mass

3. Do the same and convert g O2 to mols.

4. Using the coefficients in the balanced equation, convert mols C6H6 to mols CO2.

5. Do the same and convert mols O2 to mols CO2.

6. It is likely that the values for 2 and 3 will not agree which means one of them is wrong. The correct value in LR problems is ALWAYS the smaller value and the reagent responsible for that value is the LR.

7. Using the smaller value, convert to grams CO2. g = mols x molar mass.