Given that the preparation of 100 brownies requires 6 eggs, 5 cups flour, and 2 sticks of butter.
This can be written in the form of a chemical equation as,

We have to calculate the eggs required to prepare 50 brownies.
Mole ratio of Eggs to brownies:

Eggs required to prepare 50 brownies =

Therefore, 3 eggs would be required to prepare 50 brownies.