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Chemistry | 12th Edition | ISBN: 9780078021510 | Authors: Raymond Chang; Kenneth Goldsby
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Solved: Glaubers salt, sodium sulfate decahydrate (Na2SO4

Chapter 6, Problem 6.111

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QUESTION:

Glaubers salt, sodium sulfate decahydrate (Na2SO4 ? 10H2O), undergoes a phase transition (that is, melting or freezing) at a convenient temperature of about 328C: Na2SO4 ? 10H2O(s) Na2SO4 ? 10H2O(l) H 5 74.4 kJ/mol As a result, this compound is used to regulate the temperature in homes. It is placed in plastic bags in the ceiling of a room. During the day, the endothermic melting process absorbs heat from the surroundings, cooling the room. At night, it gives off heat as it freezes. Calculate the mass of Glaubers salt in kilograms needed to lower the temperature of air in a room by 8.28C at 1.0 atm. The dimensions of the room are 2.80 m 3 10.6 m 3 17.2 m, the specific heat of air is 1.2 J/g ? 8C, and the molar mass of air may be taken as 29.0 g/mol.

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QUESTION:

Glaubers salt, sodium sulfate decahydrate (Na2SO4 ? 10H2O), undergoes a phase transition (that is, melting or freezing) at a convenient temperature of about 328C: Na2SO4 ? 10H2O(s) Na2SO4 ? 10H2O(l) H 5 74.4 kJ/mol As a result, this compound is used to regulate the temperature in homes. It is placed in plastic bags in the ceiling of a room. During the day, the endothermic melting process absorbs heat from the surroundings, cooling the room. At night, it gives off heat as it freezes. Calculate the mass of Glaubers salt in kilograms needed to lower the temperature of air in a room by 8.28C at 1.0 atm. The dimensions of the room are 2.80 m 3 10.6 m 3 17.2 m, the specific heat of air is 1.2 J/g ? 8C, and the molar mass of air may be taken as 29.0 g/mol.

ANSWER:

Step 1 of 6

Heat energy released by air , which is absorbed by the Glauber’s salt for melting.

                                                      

The given reaction is as follows;

                                       

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