(1) If the balloon had a volume of 31000 L, how many kilograms of hydrogen were needed to fill the balloon at STP?
(2) The balloon reached an altitude of 1000 m, where the pressure was 658 mmHg and the temperature was -8 Celsius. What was the volume, in liters, of the balloon at these conditions?
(3) A sample of hydrogen (H2) gas at 127 degrees Celsius has a pressure of 2.00 atm. At a final temperature, in degrees Celsius, will the pressure of the H2 decrease to 0.25 atm, if V and n do not change?
(4) A fire extinguisher has a pressure of 10. atm at 25 degrees Celsius. What is the final pressure, in atmospheres, when the fire extinguisher is used at a temperature of 75 degrees Celsius , if V and n do not change?
Please write out equation and steps