Five samples of argon gas are described in the table below. Rank the samples in
ID: 104820 • Letter: F
Question
Five samples of argon gas are described in the table below. Rank the samples in order of increasing average kinetic energy of the atoms in them. That is, select "1" next to the sample in which the argon atoms have the lowest average kinetic energy. Select "2" next to the sample in which the argon atoms have the next lowest average kinetic energy, and so on sample average kinetic energy of atoms in sample amount pressure temperature 2.3 mol | 1.4 atrn _ 37·°C | [-( ) 1.0 mol | 2.8 atm 1-25·°C | | (Choose one) 2.1 mol1.6 14 mol3.0 atm 2.8 mol1.8 atm0. C (Choose one) Choose one) |(Choose one): 1.6 atm -16. oc -31. C (Choose one)Explanation / Answer
ANSWER
The average kinetic energy of a gas is proportional to the absolute temperature. Further Greater the number of moles or molecules in a gas sample greater is the average kinetic energy.
K = (3/2) nRT
K = average kinetic energy , n = no. of moles of gas R = gas constant , T = absolute temperature. Hence K is directly proportional to T and n.
K1 = 2.3 mol X 236K = 542.8
K2 = 1 mol X 248 K = 248
K3 = 2.1 mol X 257K = 539.7
K4 = 1.4 mol X 242K = 338.8
K5 = 2.8 mol X 223K = 624.4
So the order of average kinetic energies is K5 > K1 > K3 > KK4 > K2
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