(Solved):   please help, thank you very much:) Multiple choice: (Just write the letter (A/B/C/D/E) for ...

 

please help, thank you very much:)

Multiple choice: (Just write the letter (A/B/C/D/E) for the correct answer next to the question number) 14.3) A gas sample with a mass of 128 mg occupies 50.0 mL at 750 Torr and 27°C. The gas is: A. CO B. CO2 C. SO2 D. SF E. CHA 14.4) The reaction: XY2(g) ? X(g) + Yz(9) takes place isothermally in a sealed container with a fixed volume. Which one of the following statements is CORRECT when comparing the conditions before and after the reaction occurs? A. The number of mole of gas in the flask remains the same. B. The kinetic energy of the gas particles increase. c. The average speed of the gas particles is constant. D. The pressure in the flask remains constant. E. The pressure in the flask doubles. 14.5) If a system undergoes a series of processes and then returns to its initial state, then: A. no work will be done by the system. B. the sum of work and heat transfer for the entire process will be zero. C. AH for the entire process will be zero only if the system is kept at constant pressure. D. AS for the entire process will positive due to the changes that the system undergoes. E. AT for the entire process will only be zero if the process occurs isothermally. (2)