The pressure inside of a sealed syringe of hydrogen gas is 80.0KPa with a volume of .250 Liters. What is the pressure inside of the syringe after the plunger is pulled back far enough to make final volume of the syringe 0.750 Liters?

Before it was launched, a helium-filled balloon had a pressure of 201 kpa at a temperature of 27°c. at an altitude of 15,000 m, the pressure had decreased to 2.5 kpa and the temperature had dropped to -14 °c. the volume of the balloon increased to 59.3 m3. what is the original volume of the balloon? 13 m3 0.85 m3 0.077 m3 1.17 m3