# Re: Whoa - whereja get THAT PRICE?????

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Posted by Liz on October 13, 2002 at 17:25:57:

In Reply to: Whoa - whereja get THAT PRICE????? posted by Joel on October 13, 2002 at 16:02:13:

: : : I'm trying to find the price of elemental selenium per gram for a chem project and all i can find is the price per pound (\$300 per pound)
: : : Now, I know how to convert it from pounds to grams:
: : : 1lb = 373.24800000000004 grams = 373.248 g

: : : It's from here on that I think I'm making stuff up:
: : : in order to get the cost for 1 gram:
: : : \$300 / 373.248g = \$0.80 per gram

: : That is correct, provided you are using the right conversion factor. 373.248 converts grams to TROY pounds. There are 12 TROY ounces to a TROY pound. The only thing I know of that is usually measured in TROY ounces is gold. I don't know about selenium -- is it also measured in TROY units?
: : Otherwise, maybe you should use the conversion ratio for avoirdupois pounds: 453.592 grams/lb.
: : \$300/453.592 = 66 cents per gram.

: :
: : : Is that what I'm supposed to do? Or do i reverse it to get \$1.24 per gram?

: Was that just a theoretical example, or are you really buying selenium? You can get it from Ceramic Supply in New Jersey 1-800-723-7264 for \$28.35 per pound (also available in 1/4 pound bags for \$12.60 and 1/2 pounders for \$18.90).

: Those are REAL pounds (avoirdupois), not troy. :)

Theoretically, yes. See, the project for chemistry is "adopt an element" and we have to research the element, including its price. I chose Selenium because I thought I had heard of it before (and I had...two days later)

I got the price from Enviro Yellow Pages for Elemental Selenium (i guess the more ostentatious the name, the more expensive it gets)

Thanks for that whole Troy pound vs avoirdupois pounds... on the conversion site it said used in commerce so i thought it ment the brit pound, not the weight pound. Had I read further on in the sentence, I probably would have caught the whole most common pound weight measurement thing... plus all those vowels, the length, and its Frenchness put me off... Troy was way easier to prounce

Thanks a bunch :)
~Liz

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