## General Limiting Reactant Question

Labiba Sardar 2A
Posts: 103
Joined: Sat Jul 20, 2019 12:15 am

### General Limiting Reactant Question

When finding the percent yield, how do you know whether or not you have to find the limiting reactant (because there were questions like M.3 where you don't need to find the limiting reactant)? Do you find the limiting reactant only if the both/all the masses of the limiting reactants are given as opposed to just one given mass of one of the limiting reactants?

Chem_Mod
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Joined: Thu Aug 04, 2011 1:53 pm
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### Re: General Limiting Reactant Question

For M.3 you didn't need to find the limiting reactant because there was only one reactant. You will usually be given the number of moles/grams for each reactant and you will have to determine the limiting reactant from that in order to solve the problem.

Gwen Casillan Dis 1I
Posts: 14
Joined: Sat Sep 07, 2019 12:17 am

### Re: General Limiting Reactant Question

There was only one reactant for M.3 and therefore, you did not need to find a limiting reactant/there was none. If there is more than one reactant, you would use the given moles/masses and molar masses to determine the limiting reactant and use that information to calculate the theoretical yield.

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

### Re: General Limiting Reactant Question

If the mass of just one of the reactants is given, convert it to moles and use the molar ratio to find the amount of product. Don't worry about limiting reactant in that case.

ValerieChavarin 4F
Posts: 99
Joined: Wed Sep 18, 2019 12:18 am

### Re: General Limiting Reactant Question

When there is only one reactant in an equation, there is no limiting reactant. When calculating the limiting reactant of a reaction with multiple reactants, you need to use mass and molar mass. Then you find the theoretical/maximum yield.