Which of the following gases will have a density of 2. 104 g/l at 303 k and 1. 31 atm.

answer; (d) all matter is composed of small particles, which combine to make larger objects;

answer:

i havent taken the psat, but i have the sat, make sure to bring some snacks, because youre in there forever, 2 sharp number two pencils, an sat approved calculator, and maybe a jacket.   your phone and any books will be taken up, so don't try to bring them(but they will be given back at the end of the testing).   good luck!   i hope you do well!