Hi all I need help!

Question

1. Determine the indicated mole ratio using the balanced equation below:

2 Fe2O3 + 3 C → 4 Fe + 3 CO2

____moles Fe2O3 : ___moles CO2

If you started this reaction with 7.7 moles of Fe2O3, how many moles of CO2 would be produced?

Answer 1

Hello, Joseph,

The mole ratio is obtained from the coefficients of a balanced equation. This one looks balanced, so I trust that it takes 2 moles of Fe₂CO₃ to produce 3 moles CO₂. Just use the coefficients to determine the molar ratio of the compounds. We can use that ratio to answer the next part of the question.

2 Fe2O3 + 3 C → 4 Fe + 3 CO2

___2_moles Fe2O3 : _3__moles CO2

This is simply a conversion factor. We can arrange the terms such that "moles CO₂" is either on the top (for a 3/2 ratio) or on the bottom (2/3 ratio).

If you started this reaction with 7.7 moles of Fe2O3, how many moles of CO2 would be produced?

We can use the above conversion factor, with moles CO₂ on top.

(7.7 moles Fe2O3)*(3 moles CO₂/2 moles Fe₂CO₃) = 23.1 moles CO₂

Bob

Bob