Defiance Drake releases the emergency atmosphere into the bridge compartment. To

Question

Defiance Drake releases the emergency atmosphere into the bridge compartment. To avoid unnecessary stress, the cannister isn't simply vented, it slowly allows the pressure in the bridge compartment come up, and verifies that there are no leaks to the vacuum of space. While she waits, she has time to ponder what is happening. The gas within the canister is mainly a mixture of diatomic oxygen, diatomic nitrogen and argon. As the bridge becomes fully pressurized, the temperature of each of these gases are all 20 degrees Celsius. Which of the molecules/atoms of these gases will have the highest mean speed? Order them from slowest to fastest. How do you know this?

Explanation / Answer

Rms speed of molecules of gas is inversely proportional to the square root of molecular mass. Molecular mass of argon is greater than oxygen greater than nitrogen .Hence slowest is argon then oxygen and then nitrogen

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