Atomic/molecular collisions and pressure. The kinetic-molecular theory relates pressure to elastic collisions between individual particles and the walls of the container. - PowerPoint PPT Presentation
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Consider two specimens of ideal gas at the same temperature. The molecules in specimen #1 have greater molar mass than the molecules in specimen #2. How do the rms speed of molecules (vrms) and the average translational kinetic energy per molecule (KE) compare in the two specimens?
A. vrms and KE are both greater in specimen #2.
B. vrms is greater in specimen #2; KE is the same in both specimens.
C. vrms is greater in specimen #2; KE is greater in specimen #1.
D. Both vrms and KE are the same in both specimens.
Consider two specimens of ideal gas at the same temperature. The molecules in specimen #1 have greater molar mass than the molecules in specimen #2. How do the rms speed of molecules (vrms) and the average translational kinetic energy per molecule (KE) compare in the two specimens?
A. vrms and KE are both greater in specimen #2.
B. vrms is greater in specimen #2; KE is the same in both specimens.
C. vrms is greater in specimen #2; KE is greater in specimen #1.
D. Both vrms and KE are the same in both specimens.
Consider two specimens of ideal gas at the same temperature. Specimen #1 has the same total mass as specimen #2, but the molecules in specimen #1 have greater molar mass than the molecules in specimen #2. In which specimen is the total translational kinetic energy of the entire gas greater?
A. specimen #1
B. specimen #2
C. The answer depends on the particular mass of gas.
D. The answer depends on the particular molar masses.
Consider two specimens of ideal gas at the same temperature. Specimen #1 has the same total mass as specimen #2, but the molecules in specimen #1 have greater molar mass than the molecules in specimen #2. In which specimen is the total translational kinetic energy of the entire gas greater?
A. specimen #1
B. specimen #2
C. The answer depends on the particular mass of gas.
D. The answer depends on the particular molar masses.
• What is the average translational kinetic energy of one molecule an ideal gas of oxygen (molar mass M = 32 g/mol) at 27°C? What about nitrogen (molar mass M = 28 g/mol)?
• An atom can absorb energy as the kinetic energy of its motion.
• A molecule can absorb energy in its translation, and also in its rotation and in the vibrations of one atom in its structure with respect to the others.
• Atomic/molecular energy absorbed is termed its “heat capacity.”