Given the following reaction: Fe2O3 + Al → Fe + Al2O3
a) What is the total number of moles of Fe 0, needed to produce 8.4 moles of A1,0,?
b) How many moles of Al will be needed to completely react with 4.50 moles of Fe,0,?

a small container that holds a source of energy a solar cell that captures light energy and converts it into electricity a voltaic cell that uses the oxidation of a fuel to produce electricity

explanation:

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.