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Helium-filled balloons rise in the air because the density of helium is less than the density of air.

(a) If air has an average molar mass of 29.0 g/mol, what is the density of air at 25°C and 770 mmHg?

(b) What is the density of helium at the same temperature and pressure?

(c) Would a balloon filled with carbon dioxide at the same temperature and pressure rise?

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Rei Juez del Mundo
Rei Juez del MundoLv10
2 Dec 2020

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Related questions

1. Four balloons, each with a mass of 10.0 g, are inflated to a volume of 20.0 L, each with a different gas: helium, neon, carbon monoxide, or nitrogen monoxide. If the temperature is 25 degrees C and the atmospheric pressure is 1.00 atm, what is the density of each filled balloon?Helium= ? g/mLNeon= ? g/mLCarbon monoxide= ? g/mLNitrogen monoxide= ? g/mLIf the density of air at 25 degrees C and 1.00 atm is 0.00117 g/mL, will any of the balloons float in this air? Which ones?

Which of the following statements best explains why a closed balloon filled with helium gas rises in air?
(a) Helium is a monatomic gas, whereas nearly all the molecules that make up air, such as nitrogen and oxygen, are diatomic.
(b) The average speed of helium atoms is greater than the average speed of air molecules, and the greater speed of collisions with the balloon walls propels the balloon upward.
(c) Because the helium atoms are of lower mass than the average air molecule, the helium gas is less dense than air. The mass of the balloon is thus less than the mass of the air displaced by its volume.
(d) Because helium has a lower molar mass than the average air molecule, the helium atoms are in faster motion. This means that the temperature of the helium is greater than the air temperature. Hot gases tend to rise.

Olympic cyclists fill their tires with helium to make them lighter. Assume that the volume of the tire is 855mL , that it is filled to a total pressure of 120psi , and that the temperature is 23 C. Also, assume an average molar mass for air of 28.8 g/mol. Part A: Calculate the mass of air in an air-filled tire.Part B: Calculate the mass of helium in a helium-filled tire.Part C: What is the mass difference between the two?

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