Question

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 higher than the average speeds of air molecules, and the higher speed of collisions with the balloon walls propels the balloon upward.
c) Because the helium atoms are of lower mass than the average is molecules, the helium gas is less dense than air. The balloon thus weighs less than the air displaces by its volume.
d) Because helium has a lower molar mass than the average air molecules, the helium atoms are in faster motion. This means that the temperature. Hot gases tend to rise.​

Answer 1

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OPTION ..C..

Because the helium atoms are of lower mass than the average is molecules, the helium gas is less dense than air. The balloon thus weighs less than the air displaces by its volume.

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Answer 2

Concept:-

The methodical process of organising knowledge about the cosmos into testable, comprehensible, and predictable hypotheses is known as science. The calculated course of putting together information about the universe into testable, conceivable, and unsurprising speculations is known as science.

Given:-

Given that the question “Which of the following statements best explains why a closed balloon filled with helium gas rises in air?”

Find:-

We have to find that the correct option of the question, “Which of the following statements best explains why a closed balloon filled with helium gas rises in air?” from the given options.

Solution:-

• The correct option of the question is option $c)$ Because the helium atoms are of lower mass than the average is molecules, the helium gas is less dense than air. The balloon thus weighs less than the air displaces by its volume.
• The helium particles are of below than the normal is atoms, the helium gas is less thick than air. The inflatable consequently weighs not exactly the air dislodges by its volume.

Hence, the statement “Which of the following statements best explains why a closed balloon filled with helium gas rises in air?” Is option $c)$ Because the helium atoms are of lower mass than the average is molecules, the helium gas is less dense than air. The balloon thus weighs less than the air displaces by its volume.

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