# Stoichiometry: Understanding the Quantitative Relationship in Chemical Reactions

What is the best definition of stoichiometry, and how many moles of Z will be produced from 1.35 moles of A, assuming excess B, given the reaction: 2A + 3B → 4Y + 5Z?

## Answer:

Stoichiometry is the quantitative relationship between reactants and products in a chemical reaction and enables the calculation of moles of reactants or products. In the given chemical reaction, 3.375 moles of 'Z' will be produced from 1.35 moles of 'A'.

## Explanation:

The accurate definition of stoichiometry is the quantitative relationship between reactants and products in a chemical reaction. This concept allows us to calculate the amounts of reactants needed or products formed in a chemical reaction based on the moles of the substances.

Now, let's examine the given reaction: 2A + 3B → 4Y + 5Z. The coefficients in this balanced chemical equation tell us the ratio of moles of reactants to products. Here, the coefficient of A is 2, and the coefficient of Z is 5. So, the stoichiometric ratio between A and Z is 2:5. This implies that for every 2 moles of A reacted, 5 moles of Z are produced.

To calculate the moles of Z produced from 1.35 moles of A, we use this ratio. Setting up a proportion, we see that:

(2/5) = (1.35/x)

After cross-multiplying and solving for 'x' we find that x = 3.375 moles.

Therefore, 3.375 moles of Z will be produced from 1.35 moles of A, assuming excess B. So, option B is the closest to the correct answer.