Question

5. One mole of oxygen gas is at a pressure of 6.90 atm and a temperature of 25.0°C.

(a) If the gas is heated at constant volume until the pressure triples, what is the final temperature?
°C
(b) If the gas is heated so that both the pressure and volume are doubled, what is the final temperature?
°C

6. (a) An ideal gas occupies a volume of 1.6 cm³ at 20°C and atmospheric pressure. Determine the number of molecules of gas in the container.
molecules

(b) If the pressure of the 1.6-cm³ volume is reduced to 2.4 ✕ 10⁻¹¹ Pa (an extremely good vacuum) while the temperature remains constant, how many moles of gas remain in the container?
mol

7. At what temperature would the rms speed of neon-20 atoms equal the following speeds? (Note: The mass of a neon-20 atom is 3.32 ✕ 10⁻²⁶ kg.)

(a) the escape speed from Earth, 1.12 ✕ 10⁴ m/s
K

(b) the escape speed from the Moon, 2.37 ✕ 10³ m/s
K

Answer 1

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