Re: help with a theoretical yield problem please

From: Bob (bbx107_at_excite.com)
Date: 02/26/05 

Date: Fri, 25 Feb 2005 18:34:15 -0800

On 25 Feb 2005 01:34:06 -0600,
rebel_lemming_no_5@hotmail-dot-com.no-spam.invalid (stick_figure_girl)
wrote:

>I have to finish this pre-lab assignment before 7:00 tomorrow so if
>anyone can help I'd appreciate it.
>
>NaCl + H2O + CO2 + NH3 -----> NaHCO3 + NH4Cl
>
>1) You dissolve an excess of NaCl in a solution containing 35.0 mL of
>5.04 M ammonia. You bubble in an excess of CO2.
>Calulate the theoretical yield of sodium bicarbonate.
>
>2)You dissolve 6.29 g of NaCl in a solution containing an excess of
>ammonia. You bubble in an excess of CO2.
>Calulate the theoretical yield of sodium bicarbonate.
>
>For the first problem the moles of NH3 are .1764. For the second
>problem the moles of NaCl are .1076317591.
>
>How do you calculate the theoretical yield? You are supposed to
>determine the limiting reagent

Yes, sort of. But each part tells you very clearly which is the
limiting reagent -- by explicitly telling you that particular
ingredients are in excess. Of course, you can assume water is in
excess, since the reaction is in aqueous solution.

So you don't need to do the more complex things you suggest below,
which as you point out you can't do anyway.

bob

>but to do that you have to convert
>each of the reactants to moles? How do you convert each of them to
>moles if you aren't given how many grams of each...?
>
>I honestly don't know what the heck I'm doing, someone please help,
>I'm clueless!
>
>
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