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Thread: One small Chemistry problem

  1. #1 One small Chemistry problem 
    Forum Freshman
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    Jan 2008
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    I have midterms coming up soon, and for my Chemistry Midterm, I just can't seem to figure out how to calculate the amount of excess reactant in problems that involve Theoretical Yield and Limiting Reactant.

    Please enlighten me if possible (no pressure on anyone 8)
    Thanks in advance


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  3. #2  
    Forum Freshman
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    Can you provide an example of a problem so I might be able to do it out.


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  4. #3  
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    It is not really a problem in the traditional sense. I'm just looking for some Theory on this topic.
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  5. #4  
    Forum Bachelors Degree
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    A mole of A reacts with a mole of B to yield a mole of C. The theoretical yield is always 100%. We seldom get 100% yield because of side reactions or equilibrium processes.

    We prefer to express the theoretical result in grams or other such measurable units. Our answer is calculated from the amounts of A and B actually used.

    If we use an excess of B, then A is the limiting reagent and vice versa. We typically choose the most expensive reagent to be the limiting reagent.

    If this reply does not suit your purposes, come up with an example.
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  6. #5  
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    Thanks for the explanation. It does clear up my confusion on the topic.
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