A certain quantity of argon gas is under 2.6 atm pressure at 223 K in a 12 L vessel. How many moles of argon are present? (R = 0.08206 L·atm/ mol·K) What is the mass of this gas in grams?

It would be (at) + cu (s)

The answer should be vaporization 

Non metal is an element or substance that is not a metal metal is a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivitymetalloid is an element (e.g., germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals. they are electrical semiconductors.