Hey all, got a few questions i need help at. any hlep is fully appreciated. A rigid sealed 50-liter tank contains argon at a pressure of 5MPa and 400K. 1. What is the mass of argon - what i did here was use PV=mRT, so that means (5000kPa)(50)=m(value from table)(400). what i'm slightly confused about is the Volume, is it correct to us 50? 2. The contents of the tank are then heated so that pressure is doubled, wht is the resulting temp? - wont i us the same formula but just double the pressure and use the value of 'm' that i got from the first part. Thank you.