A tank contains 250 L of argon gas. The pressure is 8790 kPa and the temperature is 23°C. How many moles of argon are in the tank?

Kc = 0.040 for the system below at 450oc. if a reaction is initiated with 0.40 mole of cl2 and 0.40 mole of pcl3 in a 2.0 liter container, what is the equilibrium concentration of cl2 in the same system? pcl5(g) ⇄ pcl3(g) + cl2(g)

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.

Need ! asap will mark 10 pts using the room temperature line (orange line) and your periodic table, make lists that identify the state of matter (gas, liquid, or solid) in which each element you plotted exists at room temperature. explain your answers