In: Chemistry
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 39 slices of cheese.
ans)
2 slices of bread + 3 slices of cheese -------------------> 1 cheese sandwich
2 3 1
28 39 ??
here
2 slices of bread need ----------------> 3 slices of cheese
28 slices of bread need -------------> ??
slices of cheese = 28x 3 / 2 = 42
so we need 42 slices of cheese . but we have only 39 slices of cheese.
so here limiting reagent is slices of cheese
3 slices of cheese -------------------> 1 cheese sandwich
3 1
39 ??
cheese sandwich = 39 x 1 / 3 = 13
number of whole cheese sandwiches = 13