Posted by asdfjkl; on Thursday, February 19, 2009 at 11:33pm.
That compound is called ammonium sulfamate and is a white crystalline powder used as a weed killer. Its density is about 1.8 g/cm^3 at STP
You can't use the perfect gas law on powders. The volume will be 28.4/1.8 = 16 cm^3
See http://en.wikipedia.org/wiki/Ammonium_sulfamate
for more information about the compound
thank you. (:
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