what is the volume at standard temperature and pressure for 28.4g of N2H6SO3?

Answer 1

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

Answer 2

thank you. (: