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Show all your work, thanks! 18. A sample of helium gas (mass of 2.658x10-3kg), is expanded...

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18. A sample of helium gas (mass of 2.658x10-3kg), is expanded from an initial volume of 15.OL to 25.OL at constant pressure
18. A sample of helium gas (mass of 2.658x10-3kg), is expanded from an initial volume of 15.OL to 25.OL at constant pressure of 121.5kPa. i. Calculate the work output by the system during this expansion. i. Find the temperature change of the gas, for this process. ili. How much heat is absorbed during this process? 19. A container holds pure carbon dioxide gas (N=1.25x10», СОг, at 305.5K. i. Use the Periodic Table to calculate the average mass of a carbon dioxide molecule in kg. ii. What is the mass of this CO2 sample gas, in kg? iii. Calculate the total internal energy of this gas system 20. A quantity of oxygen gas (N=5.0x1020 molecules) at an initial volume of 0.250L (at T,=300.0K) is cooled to a final temperature of 105.0K. The process is performed under isochoric conditions Determine the average kinetic energy of a molecule of the gas, at its final temperature. i. ii. Calculate the Vrms for the gas molecules at the final temperature. iv. What is the (isochoric) specific heat capacity of the gas (for this process)?
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