Calculate the volume of 2.3 moles of gas exerting a pressure of 2.8 atm at 155oC.

28.9 L

Explanation:

155°C = 428K

PV= nRT

V= nRT/P   V= (2.3 mol * 0.0821*428 K) / 2.8 atm

V= 28.9 L

the stability of ephedrine derivatives (ephedrine, norephedrine, methylephedrine, pseudoephedrine, and norpseudoephedrine), and amphetamine derivatives (amphetamine, methamphetamine, 3,4- (MDA), and 3,4- (MDMA)) in urine has been studied. Spiked urine samples were prepared for stability testing. Urine samples were quantified by GC/NPD or GC/MS.