A tank contains 2500 L of argon gas. The pressure is13790 kPa and the temperature is 25ºC. How many
moles of argon are in the tank?

200. ml of 3.00 m nacl solution is diluted to a final volume of 500. ml. what is the molarity of the final solution?

An atom of sodium-23 (atomic number = 11) has a positive charge of +1. give this information, how many electrons does it have? how many proteins and neutrons does this atom have

How many grams of oxygen gas are contained in a 15 l sample at 1.02 atm and 28°c? show your work.