Question

How do you determine which reactant in a reaction remains in excess and how do you determine that reactant's mass?

Answer 1

First find the each reactant no of moles.

Determine the balanced chemical equation for the chemical reaction.

Find the limiting reactant by looking at the no of moles of each reactant. Leat no of moles reactant is limiting reactant using balanced equation.

Next another reactant is excess reactant.To find the no of moles of excess reactant using balanced equation.

Remaining no of moles are excess .

mass of excess reactant = Remaing no of moles8 gram molar mass of excess reactant.

• Determine the balanced chemical equation for the chemical reaction.
• Convert all given information into moles (most likely, through the use of molar mass as a conversion factor).
• Calculate the mole ratio from the given information.