Liquid nitrogen is useful for medical purposes and for research laboratories. Determine the minimum shaft work needed to liquefy nitrogen initially at 298 K and 0.1013 MPa and ending with saturated liquid at the normal boiling point, 77.4 K and 0.1013 MPa. The heat of vaporization at the normal boiling point is 5.577 kJ/mol, and the surroundings are at 298 K. The constant pressure heat capacity of gaseous nitrogen can be assumed to be independent of temperature at 7/ 2R for the purpose of this calculation.

(a) Consider nitrogen entering a flow device at 1 mol/min. Give shaft work in kW.

(b) Consider nitrogen in a piston/cylinder device. Give the work in kJ per mole liquefied.

(c) Compare the minimum shaft work for the two processes. Is one of the processes more advantageous than the other on a molar basis?


Found something interesting ?

• On-time delivery guarantee
• PhD-level professional writers
• Free Plagiarism Report

• 100% money-back guarantee
• Absolute Privacy & Confidentiality
• High Quality custom-written papers

Related Model Questions

Feel free to peruse our college and university model questions. If any our our assignment tasks interests you, click to place your order. Every paper is written by our professional essay writers from scratch to avoid plagiarism. We guarantee highest quality of work besides delivering your paper on time.

Sales Offer

Coupon Code: SAVE25 to claim 25% special special discount