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Old 07-02-2006, 01:27 PM   #1 (permalink)
JustJess
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Chemistry equations... HELP ME/ GRADES ARRIVED

Okay, I'm in General Chemistry Lab I. Meant for pre-med types. I'm taking the lab but haven't actually taken the lecture yet (that's in the fall). So I'm doing my lab report and I'm having trouble figuring out some terms here...


Lab procedure/point:
We mixed acetic acid with zinc metal and iodine crystals to prove that quantities are conserved throughout the reaction to make zinc iodide. All different amounts of each to prove that every time, the ratio of zinc to iodine that actually reacted remains the same.

So on to the post lab questions:

It says to calculate moles of zinc reacted and moles of iodine reacted from one "good" trial. That seems simple enough. (I think 1 mole = atomic weight in grams.) But then it says to "Separately divide moles of zinc and moles of iodine by smallest mole value". Frankly, this sounds like they forgot to mention a detail that would make this clearer... I have no idea where to find the "smallest mole value". Smallest amongst the trials? Which one, zinc, iodine, or zinc iodide?

The numbers I'm using: Total zinc that reacted: 0.56g. Total iodine that reacted: 2.00g. Total zinc iodide produced: 2.64g. (Yes, I know, it's not precise.)

From here, by the by, I'm supposed to calculate the empirical formula.... yeah. Right.

So pretty please, help me. If you don't want to type it all out, respond or pm me asking for my cell number, and I will be your best friend forever and ever, more or less.

Here's hoping! THANKS!
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Last edited by JustJess; 07-20-2006 at 06:25 AM..
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