. Helium gas is compressed from 90 kPa and 30 C to 450 kPa in a reversible, adiabatic (i. e., isentropic) process. Determine the final temperature and the work done (kJ/kg), assuming the process takes place (a) in a piston-cylinder device and (b) in a steady-flow compressor. (You may take the specific heat of He to be cp = 2.5*Rg where Rg = Ru/MW.)

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explanation:

the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.