calculate the mass at 15.0 L at NH3 at 27 digree Celsius and 900 mm hg?

Answer 1

NH3?

PV=nRT
n=PV/RT
mass/molmassNH3= PV/RT
solve for mass. change temps to Kelvins, and use R in the units of mmHg*Liters/Kelvin

Answer 2

Mass of NH3 is 22.32