What are the mass of hydrogen in a hydrogen-filled balloon and the mass of helium in a helium-filled balloon if the volume of the balloon is 2944 mL with a total pressure of 200 psi at 27 °C? What is the mass difference between the two?

• A. mass He = 0.126 g
  mass H = 0.0317 g
  Δm = 0.0943 g
• B. mass He = 0.0724 g
  mass H = 0.0182 g
  Δm = 0.0542 g
• C. mass He = 6.51 g
  mass H = 3.28 g
  Δm = 3.23 g
• D. mass He = 1.06 g
  mass H = 2.68 g
  Δm = 1.62 g

Answer: (C)