When we double the mass the amount of KE is

What is the density of the black hole

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?

When electrolyzing copper (ll) chloride, what reaction takes place at the anode? what reaction takes place at the cathode?