Author Question: A 610-g quantity of an ideal gas undergoes a reversible isothermal compression at a temperature of ... (Read 213 times)

tatyanajohnson · **on:** Jul 29, 2018

A 610-g quantity of an ideal gas undergoes a reversible isothermal compression at a temperature of 330 K. The compression reduces the volume of the gas from 0.40 m3 initially, to 0.21 m3 finally.

The molecular mass of the gas is 33.0 g/mol and the ideal gas constant is R = 8.314 J/(molK). The entropy change for the gas is closest to
A) -99 J/K.
B) -81 J/K.
C) 99 J/K.
D) 81 J/K.
E) 0.00 J/K.

Question 2

At atmospheric pressure, 45 moles of liquid helium are vaporized at its boiling point of 4.22 K. The heat of vaporization of helium, at atmospheric pressure, is 2.09 104 J/kg,

and the atomic weight of helium is 4.00 g/mol. The change in the entropy of the helium, as it vaporizes, is closest to
A) 890 J/K.
B) 14,000 J/K.
C) 18,000 J/K.
D) -9400 J/K.
E) -14,000 J/K.