You have four gas samples: 1. 1.0 L of H 2 at STP 2. 1.0 L of

Question:

You have four gas samples:
1. 1.0 L of H₂ at STP
2. 1.0 L of Ar at STP
3. 1.0 L of H₂ at 27°C and 760 mm Hg
4. 1.0 L of He at 0°C and 900 mm Hg
(a) Which sample has the largest number of gas particles (atoms or molecules)?
(b) Which sample contains the smallest number of particles?
(c) Which sample represents the largest mass?