2.8. A tank containing 20 kg of water at 20°C is fitted with a stirrer that delivers work to the water at the rate of 0.25 kW. How long does it take for the temperature of the water to rise to 30°C if no heat is lost from the water? For water, Cp = 4.18 kJ-kg-1.°C-1. 2.9. Heat in the amount of 7.5 kJ is added to a closed system while its internal energy decreases by 12 kJ. How much energy is transferred as work? For a process causing the same change of state but for which the work is zero, how much heat is transferred?
2.8. A tank containing 20 kg of water at 20°C is fitted with a stirrer that delivers work to the water at the rate of 0.25 kW. How long does it take for the temperature of the water to rise to 30°C if no heat is lost from the water? For water, Cp = 4.18 kJ-kg-1.°C-1. 2.9. Heat in the amount of 7.5 kJ is added to a closed system while its internal energy decreases by 12 kJ. How much energy is transferred as work? For a process causing the same change of state but for which the work is zero, how much heat is transferred?
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text:2.8. A tank containing 20 kg of water at 20°C is fitted with a stirrer that delivers work to
the water at the rate of 0.25 kW. How long does it take for the temperature of the water
to rise to 30°C if no heat is lost from the water? For water, Cp = 4.18 kJ.kg-1.°C-1.
2.9. Heat in the amount of 7.5 kJ is added to a closed system while its internal energy
decreases by 12 kJ. How much energy is transferred as work? For a process causing the
same change of state but for which the work is zero, how much heat is transferred?
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