Which of the following gases would have the highest average speed at the same te

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Question: Which of the following gases would have the highest average speed at the same temperature? (2020)

Options:

Correct Answer: Hydrogen (H2)

Exam Year: 2020

Solution:

At the same temperature, lighter gases have higher average speeds. Hydrogen (H2) has the lowest molar mass and thus the highest average speed.

Which of the following gases would have the highest average speed at the same temperature? (2020)

Which of the following gases would have the highest average speed at the same temperature? (2020)

Step 1: Understand that gases at the same temperature move at different speeds based on their mass.
Step 2: Remember that lighter gases (those with lower molar mass) move faster than heavier gases.
Step 3: Identify the gases given in the question and find their molar masses.
Step 4: Compare the molar masses of the gases. The gas with the lowest molar mass will have the highest average speed.
Step 5: Conclude that Hydrogen (H2) has the lowest molar mass among common gases, so it will have the highest average speed.

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