True or false: with a given number of moles of solvent, the solution will always have the same concentration

Describe the interaction that occurs between two objects with the same electrical charge.

If i initially have a gas at a pressure of 12 atm, a volume of 23 liters, and a temperature of 200 k, and then i raise the pressure to 14 atm and increase the temperature to 300 k, what is the new volume of the gas?

Find the number of moles of argon in 364g of argon.