Magnesium sulfate is often used in first-aid hot packs, giving off heat when dissolved in water. A coffee-cup calorimeter at 25°C contains 15.0 mL of water at 25°C. A 2.00 g sample of ????4 is dissolved in water and 1.51 kJ of heat are evolved. Assume that the volume of solution is 15.0 mL, the density of the solution is 1.00 g/mL, and the specific heat of the solution is 4.18 J/g°C.a. Write a balanced equation for the dissociation of magnesium sulfate.b. Is the process exothermic (heat flows from the system to the surroundings)?c. What is ??2??d. What is the final temperature of the solution?

Question
Asked Dec 27, 2019
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Magnesium sulfate is often used in first-aid hot packs, giving off heat when dissolved in water. A coffee-cup calorimeter at 25°C contains 15.0 mL of water at 25°C. A 2.00 g sample of ????4 is dissolved in water and 1.51 kJ of heat are evolved. Assume that the volume of solution is 15.0 mL, the density of the solution is 1.00 g/mL, and the specific heat of the solution is 4.18 J/g°C.
a. Write a balanced equation for the dissociation of magnesium sulfate.
b. Is the process exothermic (heat flows from the system to the surroundings)?
c. What is ??2??
d. What is the final temperature of the solution?

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Expert Answer

Step 1

Given:

Volume of water=15.0 mL

Mass of MgSO4=2.00 g

Heat evolved=1.51 kJ

Density of solution=1.00 g/mL

Specific heat of solution=4.18 J/goC

Initial temperature of water=T1=25oC

Step 2

a). The balanced equation for the dissociation of magnesium sulfate:

In a coffee cup calorimeter, the heat of the reaction (q reaction) corresponds to the magnesium sulfate dissolution in water.

In this reaction, the heat flow has equal magnitude but sign is opposite to that of the calorimeter based on calorimetry principles.

Chemistry homework question answer, step 2, image 1
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Step 3

Since the calorimeter essentially contains water...

Chemistry homework question answer, step 3, image 1
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Physical Chemistry

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