A child is holding a balloon containing 25.0 L of helium gas at 150 kPa. The child accidentally lets the...

A child is holding a balloon containing 25.0 L of helium gas at 150 kPa. The child accidentally lets the balloon go. The balloon begins to expand as it rises into the air. Assuming that the temperature remains constant, to what volume of helium will the balloon expand when it rises to an altitude where the pressure is only 50.0 kPa