A thermally insulated 2.50-L flask contains monatomic xenon gas at an initial te

Question

A thermally insulated 2.50-L flask contains monatomic xenon gas at an initial temperature of 50.0 degree C and pressure of 2.50 atm. You now add enough energy to double the thermal energy of the gas. The mass of a xenon atom is 2.18 times 10^-25 kg. How many atoms does the flask contain? N = 1.41 times 10^23 atoms How much energy did you add to the flask? Express your answer with the appropriate units. E_ = 112.67 middot 10^-23 J By what factor did you change the root-mean-square speed of the atoms? v_ /v_ = 1.41

Explanation / Answer

Thermal energy is doubled means temperature is doubled

Initial temp=50C=323 K

Final temp=100 C=273 K

Energy added=n*R*change in temperature

n=0.23

So we got energy added=95.611 J

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