A fuel is burned in a cylinder equipped with a piston. The initial volume of the

Question

A fuel is burned in a cylinder equipped with a piston. The initial volume of the cylinder is 0.0325 m^9. The piston expands against a constant pressure of 1.25 middot 10^5 Pa. The amount of the expansion work is -687.5 J. The final volume of the cylinder is: a. 0.0055 m^3 b. 0.0270 m^3 c. 0.0380 m^3 d. 0.1493 m^3 e. 0.2143 m^3 f. 3.3750 m^3 g.4.0625 m^3 h. None of the above; the final volume is ________m^3. In a certain process carried out at a constant pressure of 1 aim (101325 Pa), a system absorbs 151 J of heat from its surroundings and docs 53 J of work on the surroundings. In this process, the change in internal energy, Delta E, is ________ J, and the change in enthalpy, Delta H, is ________ J. The molar heat capacity of uranium (U) is 27.665 J middot mol^-1 middot K^-1. The atomic weight of uranium is 238.0289 g middot mol^-1. The amount of heat required to heat a uranium fuel rod weighing 1748 g from 25.0 degree C to 280.0 degree C is: a. 29.6 J b. 1873 J c. 51806 J d. 56885 J e. 107300 J f. 112739 J g. 3835135 J h. 12331397 J i. None of the above; the correct amount of heat is _________ J

Explanation / Answer

Apply

W = -P*(Vf-Vi)

substitute known data

-687.5 = -(1.25*10^5)*(Vf-0.0325)

Vf = 687.5 /(1.25*10^5) + 0.0325

Vf = 0.038 m3

choose C

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