Average translational kinetic energy per molecule of an ideal gas is given by_____________?
Correct answer: C. 3RT/2Na
- A. 3NaT/2R
- B. 2NaT/3
- C. 3RT/2Na
- D. 3Na/2RT
Explanation
The average translational kinetic energy per molecule is 3kT/2, and k = R/Na, so it becomes 3RT/(2Na) joules per molecule. The likely mistake is choosing 3NaT/2R, which reverses the relation k = R/Na and gives the wrong dependence on Avogadro's number.
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About Molar Specific Heat of a Gas
Molar specific heat is the heat required to raise the temperature of one mole of a gas by one kelvin, expressed through Q = nCΔT. Questions compare the constant volume value Cv with the constant pressure value Cp, apply the ideal gas relation Cp − Cv = R, and identify how the thermodynamic process affects heat capacity.
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