The concept of determining which reactant is limiting and which is in excess is

Question

The concept of determining which reactant is limiting and which is in excess is akin to determining the number of sandwiches that can be made from a set number of ingredients. Assuming that a cheese sandwich consists of 2 slices of bread and 3 slices of cheese, determine the number of whole cheese sandwiches that can be prepared from 28 slices of bread and 45 slices of cheese.

Which of the two ingredients limits the number of sandwiches that can be made?

What quantity of the ingredient in excess remains?

Explanation / Answer

n = 2 slices bread

C = 3 slices chess

n = 44 bread slices = can form up to 44/2 = 22 sandiwches

C = 75 slices -- total sandwiches = 75/3 = 25 sandwieches

there are not enough bread for sandwiches so

choose 22 sandiwches as max. number of sandwiches

b)

the slices of bread will only form 22 sandwiches, whereas the 25 sandiwches from cheese

therefore, bread is limiting

c)

excess slices = 22 sandiwches * 3 slices = 66 required

75-66 = 9 slices left

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