4. A spherical glass container of unknown volume contains helium gas at 25°C and 1.960 atm. When a portion of the helium is withdrawn and adjusted to 1.00 atm at 25°C, it is found to have a volume of 1.75 cm3 . The gas remaining in the first container shows a pressure of 1.710 atm. The volume of the spherical container is _________ L. (A) (B) (C) (D) 0.7 (E) 7

5. Which one of the following statements is correct? (A) For a 1.0-L container of neon gas at STP, its frequency of collision with the container walls will increase when the temperature is decreased to -50°C. (B) Real gas behaves most ideally when a container volume is relatively small and the gas molecules are moving relatively slow. (C) For separate 1.0-L gaseous samples of H2, Xe, Cl2 and O2 all at STP, H2 has the highest average velocity. (D) For separate 1.0-L gaseous samples of H2 and O2 that all have the same average velocity, O2 has a lower temperature. (E) For separate 1.0-L gaseous samples of H2, Xe, Cl2 and O2 all at STP, Xe has the highest average kinetic energy.

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