Limiting reactants  [ENDORSED]

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Limiting reactants

Postby 005199302 » Thu Oct 04, 2018 7:00 pm

If a problem gives the grams of only one reactant, is it safe to assume that reactant is the limiting reactant? If so, why?

Austin Clack
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Re: Limiting reactants

Postby Austin Clack » Thu Oct 04, 2018 7:18 pm

It could be the limiting reactant, however, just because the other reactant's grams aren't specified does not mean it isn't. While both can't be limiting, there may be more information in the problem for you to be able to solve the mass of the other reactant, such as a given amount of moles.

Nicholas Kull_3L
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Re: Limiting reactants  [ENDORSED]

Postby Nicholas Kull_3L » Thu Oct 04, 2018 7:27 pm

It is not safe to say because there is a possibility that it could be the other reactant. After identifying the reactants and balancing the chemical equation, you should calculate the molar mass of the reactants and products and convert it into moles. Then to compare the calculated moles to the required moles in the balanced reaction to determine if your inference about the reactant with listed grams is indeed the limiting reactant.

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Re: Limiting reactants

Postby 505211599 » Thu Oct 04, 2018 8:37 pm

I wouldn't necessarily say that you can assume that the one reactant would be the limiting reactant because there could be additional details in the problem that would say otherwise. However, you could assume that if all other reactants were in "excess", then the one reactant would be considered the limiting reactant.

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