1. Calculate the work (in joules) for each of the following processes. Specify the sign of work. The system is given in italics. Is work done on the system or by the system? (A) An ideal gas expands from 20.0 L to a final volume of 85.0 L against a constant external pressure of 2.5 bar. (B) A water bubble is expanded from a radius of 1.00 cm to a radius of 3.25 cm. The surface tension of water is 71.99 N/m. How much work is done in the process? (C) A current of 3.20 A is passed through a heating coil for 30.0 s. The electrical potential across the resistor is 14.5 V. Calculate the work done on the coil. (D) An object is pushed in the z direction by a force F = az + b, where the constant a has the value 300.0 N and the constant b has the value 500.0 N. Find the work done in moving the object from z = 0 to z = 10.0 m. (E) The volume of an ideal gas changes from 1 L to 3 L at an initial temperature of 25°C and a constant pressure of 1 atm. (F) The volume of an ideal gas changes from 5 L to 3 L at an initial temperature of 25°C and a constant pressure of 1 atm. (G) What is the change in volume for parts E and F and explain why the answers for E and F are the same or different. (H) Consider the volume change in part E, but the temperature is constant at 25°C and the initial pressure is 1 atm. (I) Compare your answers to parts E and H. Explain why they are the same or different.
The question belongs to Chemical Engineering and it deals with calculation of work in joules. Various questions have been answered and given in the solution in detail.
Total Word Count 243
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