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7.5mol of helium are in a 0.015m^3 cylinder under absolute pressure of 5.50x10^5 Pa. What are...

7.5mol of helium are in a 0.015m^3 cylinder under absolute pressure of 5.50x10^5 Pa. What are A) the temperature of the gas in celcius and B) the average kinetic energy of a helium atom at this temperature. C) what is the rms speed of the helium atom at this temperature? (Ka= 1.38x10^-23 J/K) (mHe=6.65x10^-27 kg)

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