# Re: Making sure I haven't totally gone insane

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Posted by Joel on October 13, 2002 at 15:54:35:

In Reply to: Making sure I haven't totally gone insane posted by Liz on October 13, 2002 at 15:13:45:

: 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?

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