the pardai pi 8.8 Which of the following statements are correct? (Not g. She Bef
ID: 1770240 • Letter: T
Question
the pardai pi 8.8 Which of the following statements are correct? (Not g. She Before rature than one statement may be correct) (a) The average kinetic energy of an atom of an ideal gas ap- proaches zero at a temperature of 0 °C. (b) Two moles of helium (He) has th e same total thermal energy s the tom as one mole of nitrogen (N2) when they are both at 10 because nitrogen is a diatomic gas. (c) The average translational kinetic energy of the molecules of air is kT, where k is the Boltzmann constant and T is the temperature in kelvin. (d) The average thermal energy of the molecules of air is O. in- where k is the Boltzmann constant and T is the temperature in degrees kelvin. (e) The ideal gas law can be written as PV- NkT, where N is the number of molecules of the gas in the volume V and kis the Boltzmann constant. er?Explanation / Answer
a). Average Kinetic enrgy is directly proportional to T i.e., temperature in Kelvin
=> For the present case, KE ave s directly proportional to 273 K => The atom certainly has KE ave which is not equal to zero. So, the given statement is wrong. [Note: KE ave becomes zero at 0 kelvin. Don't confuse with 0 degree centigrade and 0 kelvin].
b). The statement is wrong. As, two moles of He never equals to one mole of N2 at same T due to different specic heats.
c). The statement is correct.
d). The statement is wrong.
e). The statement is correct when expressed in Boltzman constant(k) and number of molecules (N).
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