Enter your answer in the provided box. 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: Na2SO4 · 10H2O(s) → Na2SO4 · 10H2O(l)ΔH o = 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 Glauber's salt in kilograms needed to lower the temperature of air in a room by 8.2°C at 1.0 atm. The dimensions of the room are 2.8 m × 10.6 m × 17.0 m, the specific heat of air is 1.2 J/g °C, and the molar mass of air may be taken as 29.0 g/mol.

the tides are influenced by both the moon and the sun, it's easy to see that when the sun lines up with the moon and the earth, as during a new moon or full moon, the tidal effect is increased. these are known as spring tides, named not for the season, but for the fact that the water "springs" higher than normal. on the other hand, if the sun and the moon are 90 degrees apart in relation to an observer on earth as during the first quarter moon or third quarter moon, then high tides are not as high as they normally would be. this is because despite its greater distance, the sun's mass allows it to exert enough gravitational force on the oceans that it can negate some of the effects of the moon's pull. this phenomenon of lower high tides is called a neap tide. if you need more information on this topic visit moonconnection.com.

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