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At 298 K, which of the following gases has the lowest average molecular speed?
  • a)
    CO2 at 0.20 atm
  • b)
    He at 0.40 atm
  • c)
    CH4 at 0.80 atm
  • d)
    NO at 1.00 atm
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
At 298 K, which of the following gases has the lowest average molecula...
Under the same conditions the average kinetic energy of the gases should be equal.
speed of gas1/speed of gas 2 = square root of (molar mass of gas2/molar mass of gas 1)
So gases with small molar mass will move quicker
eg speed of N2/speed of CO2 = sq. rt (44/28) = 1.25
speed of N2/speed of F2 = sq rt. (38/28) = 1.16
So order is N2, F2 and CO2
then we concluded right ans. is (A)
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Most Upvoted Answer
At 298 K, which of the following gases has the lowest average molecula...
Under the same conditions the average kinetic energy of the gases should be equal.
speed of gas1/speed of gas 2 = square root of (molar mass of gas2/molar mass of gas 1)
So gases with small molar mass will move quicker
eg speed of N2/speed of CO2 = sq. rt (44/28) = 1.25
speed of N2/speed of F2 = sq rt. (38/28) = 1.16
So order is N2, F2 and CO2
then we concluded right ans. is (A)
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Community Answer
At 298 K, which of the following gases has the lowest average molecula...
Under the same conditions the average kinetic energy of the gases should be equal.
speed of gas1/speed of gas 2 = square root of (molar mass of gas2/molar mass of gas 1)
So gases with small molar mass will move quicker
eg speed of N2/speed of CO2 = sq. rt (44/28) = 1.25
speed of N2/speed of F2 = sq rt. (38/28) = 1.16
So order is N2, F2 and CO2
then we concluded right ans. is (A)
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At 298 K, which of the following gases has the lowest average molecular speed?a)CO2 at 0.20 atmb)He at 0.40 atmc)CH4 at 0.80 atmd)NO at 1.00 atmCorrect answer is option 'A'. Can you explain this answer? for Class 11 2025 is part of Class 11 preparation. The Question and answers have been prepared according to the Class 11 exam syllabus. Information about At 298 K, which of the following gases has the lowest average molecular speed?a)CO2 at 0.20 atmb)He at 0.40 atmc)CH4 at 0.80 atmd)NO at 1.00 atmCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 11 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for At 298 K, which of the following gases has the lowest average molecular speed?a)CO2 at 0.20 atmb)He at 0.40 atmc)CH4 at 0.80 atmd)NO at 1.00 atmCorrect answer is option 'A'. Can you explain this answer?.
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