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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.

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Jean Keeling
Jean KeelingLv2
17 Dec 2019

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Related questions

When a 9.55 g sample of solid NaOH(s)
dissolve in 100.00 g of water in a coffeecup
calorimeter, the temperature rises from
23.6 oC to 47.4 oC. Calculate the ?H
(kJ/mol of NaOH) for the solution process
assuming that specific heat of the solution
is the same as that of pure water.
? Assume that the specific heat and density
of the resulting solution are equal to those
of water (4.18 J/g.K and 1.00g/mL) and
that no heat is lost to the calorimeter itself.

A sample of nickel is heated to 99.8 oC and placed in a coffee cup calorimeter containing 150.0 g of water at 23.5 oC. After the metal cools, the final temperature of the metal and water mixture isΒ  25.0 oC. If the specific heat of the nickel is 0.444 J/g oC and the specific heat of water is 4.18 J/gΒ oC, what mass of nickel was originally heated? Assume that no heat was lost in the surroundings.

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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