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The rms speeds of the molecules of Hydrogen, Oxygen and Carbondioxide at the same temperature are V_H, V_O and V_C respectively then:
- V_H > V_O > V_C
- V_C > V_O > V_H
- V_H = V_O > V_C
- V_H = V_O = V_C
Correct answer: V_H > V_O > V_C
Solution
The root mean square (rms) speed of gas molecules is inversely proportional to the square root of their molar mass. Since hydrogen has the lowest molar mass among the three gases, it has the highest rms speed, followed by oxygen and then carbon dioxide.
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