How to find Excess Reactant?

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Lauren Lewis3L
Posts: 57
Joined: Wed Feb 20, 2019 12:16 am

How to find Excess Reactant?

Postby Lauren Lewis3L » Sun Oct 13, 2019 9:10 pm

After figuring out which is an excess and limited reactant, how are you able to calculate what is remaining of the excess reactant? Is it Total Reactant-Reactant Used? If so then how do you determine how much of the excess is used?

Midori Hupfeld 3D
Posts: 55
Joined: Fri Aug 30, 2019 12:17 am

Re: How to find Excess Reactant?

Postby Midori Hupfeld 3D » Sun Oct 13, 2019 9:12 pm

You have to calculate how much of the reactant is used up in the reaction by converting it from the product produced. Then you subtract the amount of the reactant that was used up from the amount of that reactant that you had to begin with.

Anna Chen 1K
Posts: 104
Joined: Thu Jul 25, 2019 12:18 am

Re: How to find Excess Reactant?

Postby Anna Chen 1K » Sun Oct 13, 2019 9:14 pm

To find the amount of excess reactant remaining, subtract the mass of excess reagent consumed from the mass of excess reagent given.

Amy Kumar 1I
Posts: 114
Joined: Thu Jul 11, 2019 12:15 am

Re: How to find Excess Reactant?

Postby Amy Kumar 1I » Sun Oct 13, 2019 9:18 pm

Use the limiting reactant and molar ratio to find the amount of product formed. Subtract that from the amount of product would've been formed from the excess reactant.

Sarah Blake-2I
Posts: 153
Joined: Fri Aug 30, 2019 12:16 am

Re: How to find Excess Reactant?

Postby Sarah Blake-2I » Sun Oct 13, 2019 9:19 pm

To find the excess reactant leftover, you take the limiting reactant and compare the mole ratio of the excess to the limiting reactant to find the moles of the excess that is actually used. Then convert to grams and take the theoretical amount (what you calculated at first) - the actual amount using the limiting reactant to give you the amount leftover. So yes it is total reactant- reactant used! And to determine how much of this excess is used, you use the limiting reactant and compare to mole ratio.

Mai V 4L
Posts: 111
Joined: Fri Sep 28, 2018 12:23 am

Re: How to find Excess Reactant?

Postby Mai V 4L » Sun Dec 08, 2019 9:10 am

Will this be on the final?


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