Glauber's salt, sodium sulfate decahydrate (Na2SO4 · 10H2O), undergoes a phase transit...

Glauber's salt, sodium sulfate decahydrate (Na2SO4 · 10H2O), undergoes a phase transition (that is, melting or freezing) at a convenient temperature of about 32°C:

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 endothermie melting process absorbs heat from the surroundings, cooling the room. At night, it gives off heat as it freezes. Calculate the mass of Glauber's salt in kilograms needed to lower the temperature of air in a room by 8.2°C. The mass of air in the room is 605.4 kg; the specific heat of air is 1.2 J/g °C.