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13 Dec 2019

1. When 5.0 g of KOH were dissolved in 74.0 g water in a calorimeter at 23.9oC, the temperature of the solution went up to 37.8oC.

Is the solution endothermic or exothermic? Why?

2. When 5.0 g of KOH were dissolved in 74.0 g water in a calorimeter at 23.9oC, the temperature of the solution went up to 37.8oC.

What is ΔH for the solution of one mole KOH in water with the unit of KJ/mole?

3. A student obtained an unknown metal sample that weighed 65.3 g and at a temperature of 99.8oC, he placed it in a calorimeter containing 43.7 g of water at 25.7oC. At equilibrium the temperature of the water and metal was 34.5oC.

Knowing the specific heat of the water to be 4.18 J/goC, what is the specific heat of the metal?

[ Hint: S.H.water x mwater x Δt water= S.H.metal x mmetal x Δt metal ]

4. Assuming that KOH exists as K+ and OH- ions in solution, what is the equation that occurs when KOH is dissolved in water?

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Related questions

8. When 10.0 g of KOH was dissolve in 1000.0 g of water in a coffee cup calorimeter, the temperature rises from 25.18 oC to 47.53 oC. What is the enthalpy change per gram of KOH dissolve in the water? Assuming has the specific heat capacity of 4.18 J/g.K

9. When an unknown metal at 28.5 oC is placed in 83.0 g water at 78.5 oC, the water temperature decreases to 75.9 oC. What is the specific heat capacity of the metal? The specific capacity of water is 4.184J/g.K.


Please help! show calculations and answer

1. On dissolving 5.0 g of sodium hydroxide in 50.0 g of water the temperature in the calorimeter went up from 25.0 oC to 45.5 oC. Is this an exothermic reaction? Calculate the enthalpy of the above reaction in kJ/mol. Use your value for Cp=(27.65).

2. To a calorimeter containing 50. g of water at 25 oC, a student added 30. g of water at 70. oC. The final temperature of solution was measured to be 40.5 oC. What is the heat capacity of the calorimeter?

3. A sample of metal weighing 35.5g at a temperature of 100 oC was placed in a calorimeter containing 50 g of water at 25.0 oC. At equilibrium the temperature of water and metal was 35.5 oC. Calculate the heat capacity of the metal. . Use your value for Cp=(27.65).

4. When 0.50 g of magnesium metal is placed in a calorimeter, and 100. mL of 1.0 M HCl were added the temperature of solution increased from 22.2 oC to 44.2 oC. Assume that the specific heat of solution is 4.18 J/goC and that the density is 1g/mL. Write a balanced equation for the above reaction. Calculate the enthalpy of reaction per mole of magnesium. . Use your value for Cp=(27.65).

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