General Limiting Reactant Question

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Labiba Sardar 2A
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General Limiting Reactant Question

Postby Labiba Sardar 2A » Fri Oct 04, 2019 12:03 pm

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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Re: General Limiting Reactant Question

Postby Chem_Mod » Fri Oct 04, 2019 12:20 pm

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
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Re: General Limiting Reactant Question

Postby Gwen Casillan Dis 1I » Fri Oct 04, 2019 12:26 pm

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
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Re: General Limiting Reactant Question

Postby Amy Kumar 1I » Fri Oct 04, 2019 12:39 pm

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
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Re: General Limiting Reactant Question

Postby ValerieChavarin 4F » Fri Oct 04, 2019 1:37 pm

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.


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