Answer:
12.125 moles of Z
Explanation:
Hi! Here, since you only know the number of moles for one of the reactants, you will use the coefficients in the reaction to use the mole ratio to find your answer. Since the question states that there are 4.85 mol A and excess B, A is your limiting reactant. This means that once all of the A is used up in the reaction, you will have your maximum amount of Z left behind because there will only be B left and no A to make more Z.
The mole ratio of A:Z is 2:5, found from the coefficients in the chemical equation(2 moles of A for every 5 moles of Z).
So, start with the information that is given to you (4.85 mol A) and then use the mole ratio, like this:
4.85 mol A([tex]\frac{5 mol Z}{2 mol A}[/tex])
This way, the mol A will cancel out, leaving behind mol Z (always put the unit you are looking for on top).
Doing this leads to mol Z = 12.125 mol.
I hope this helps! Good luck with your finals!
