Which of the following gases has the highest RMS speed at the same temperature?
Correct Answer: Hydrogen (H2)
- Step 1: Understand what RMS speed means. RMS speed is a way to measure the speed of gas molecules at a certain temperature.
- Step 2: Know that RMS speed is affected by the molar mass of the gas. Molar mass is the weight of one mole of a substance.
- Step 3: Remember the rule: the lower the molar mass, the higher the RMS speed. This means lighter gases move faster.
- Step 4: Look at the gases given in the question and find their molar masses. Identify which gas has the lowest molar mass.
- Step 5: Conclude that the gas with the lowest molar mass will have the highest RMS speed at the same temperature.
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