STP stand for standard temperature and pressure. The values of STP are 22.4 liters, 1mole, 1.00 atmospheres, and 273 kelvin. Under these conditions, all gases behave ideally or the same.
1.78
Answer:
A few useful bits of Argon data:
Molecular weight : 39.948 g/mol
Liquid density (1.013 bar at boiling point) : 1392.8 kg/m3
Gas density (1.013 bar and 15 °C (59 °F)) : 1.67...