10. (05.05 MC)

Read the chemical equation.

Fe2O3 + CO → Fe + CO2

If 1.8 moles of Fe2O3 react with 2.7 moles of CO, how many moles of each product are formed? (3 points)

5.4 moles Fe and 1.8 moles CO2

2.7 moles Fe and 0.9 moles CO2

3.6 moles Fe and 5.4 moles CO2

1.8 moles Fe and 2.7 moles CO2

1.8 moles Fe and 2.7 moles are produced.

Explanation:

The balanced chemical reaction is:

According to stoichiometry :

3 moles of require 1 mole of

Thus 2.7 moles of will require=  of

Thus is the limiting reagent as it limits the formation of product and is the excess reagent.

As 3 moles of give = 2 moles of  and 3 moles of

Thus 2.7 moles of will give =  of  and  of

Thus 1.8 moles Fe and 2.7 moles are produced.

the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.