Limiting Reactant

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Naana Boateng 1I
Posts: 58
Joined: Fri Sep 29, 2017 7:07 am

Limiting Reactant

Postby Naana Boateng 1I » Tue Nov 07, 2017 7:17 pm

Is it correct to assume that the limiting reactant is always the value that has the smallest amount of moles out of the two that are being compared?

Natalie LeRaybaud 1G
Posts: 54
Joined: Thu Jul 13, 2017 3:00 am

Re: Limiting Reactant

Postby Natalie LeRaybaud 1G » Tue Nov 07, 2017 7:26 pm

Yes you can assume this only if you have solved for the amount after your conversions. Like after you convert from percent-->grams-->moles--> and then divide by the smallest mole. The lowest value at that point is safe to say is the limiting reactant, otherwise you can't assume (like if your just talking about the initial moles given in the problem or something). Hope this helps!

Golbarg Rahimi 3k
Posts: 26
Joined: Sat Jul 22, 2017 3:01 am

Re: Limiting Reactant

Postby Golbarg Rahimi 3k » Wed Nov 08, 2017 11:20 pm

Another strategy that seems to work when comparing moles is figuring out the number of moles for each compound and dividing it by its stoichiometric coefficient. At this point, we could compare the 2 numbers. The smaller number is the limiting reactant.
Moles
————-
Coefficient

Isabella Zizolfi 2F
Posts: 21
Joined: Fri Sep 29, 2017 7:05 am

Re: Limiting Reactant

Postby Isabella Zizolfi 2F » Wed Nov 08, 2017 11:26 pm

Firstly I usually find the moles for each of the reactant and then through a ratio (moles of first reactant : x = stoichiometric number first reactant : stoichiometric number second reactant) I calculate the amount of moles of the second reactant I should need and then I compare the moles that I have with the ones I should.


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