Energy balance and heat capacity, Chemistry

You may have eaten "astronaut ice cream" as a kid at a science museum or planetarium to experience the type of food eaten by astronauts. Astronaut ice cream is made by chilling the ice cream to -40°C so that all of the water turns to ice. After freezing, the ice cream is subjected to vacuum and heat to sublimate (solid to vapor phase change) the ice and remove the water vapor through the vacuum pump. 75 kg/hr of ice cream (containing 40% by mass water) at -40°C is fed to the vacuum chamber. 98% of the water in the ice cream leaves the chamber as a vapor at 40°C and the rest of the water is a liquid, still with the "dried" ice cream, at 25°C. Calculate the required heat input for this process. You may assume that the vacuum pump work is very small compared to enthalpy and heat, and may be neglected in your energy balance. The heat capacity, Cp, of ice is 2.17 J/(g·°C) and the heat capacity Cp of ice cream (the non-water components) is 1.25 J/(g·°C). For simplicity, you may use only the first two terms of the heat capacity (a+bT) instead of the entire formula for water vapor and liquid.

 

 

Posted Date: 2/18/2013 6:03:44 AM | Location : United States







Related Discussions:- Energy balance and heat capacity, Assignment Help, Ask Question on Energy balance and heat capacity, Get Answer, Expert's Help, Energy balance and heat capacity Discussions

Write discussion on Energy balance and heat capacity
Your posts are moderated
Related Questions
1. Produce a figure with an appropriate figure legend of your SDS-PAGE gel that could be published in a scientific journal.   Indicate all relevant information, e.g.origin, f

The type of orbitals present in Fe  is : (1) s                       (2) s  and p     (3)  s, p and d            ()s, p, d, and f Ans: s, p and d

The wavelength of a spectral line for an electronic transition is inversely related to: (1) The number of electrons undergoing the transition (2) The nuclear charge of the a

procedue of Ni in banaspati ghee

A Tris buffer at pH 6.0 (here "Tris" is a nickname use for Tris hydroxymethyl amino methane). For the given pK A table is Tris a compound you would select for a buffer at pH 6.0?

Physical properties of Alkyl cyanides (1) Alkyl cyanides are neutral substance with pleasant odour, similar to bitter almonds. (2) Alkyl cyanides are Lower members containin

Methods of showing concentrations of solutions The concentration of a solution can be provided in various ways. (A) Percent by mass (B) Molarity (C) molality (D) Mo



Interconversion of the resonance structures of carbon monoxide with the curved-arrow notation: Because the carbon in the structure on the left has a sextet of electrons, it