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Chemistry Calorimetry Problems and Solutions

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Sandra Watson
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Calorimetry Worked Problems Chemistry

1. A water calorimeter at 20.1oC contains 643.2 g of water. Addition of 2.744 g of KOH to the calorimeter produces a temperature rise to 23.4oC. Let us compute the molar heat of solution of KOH from these data. The molar heat
capacity of water is 75.291 J/mol K.

2: Suppose a piece of iron with a mass of 21.5 g at a temp of 100.0 °C is dropped into an insulated container of water. The mass of the water is 132.0 g and its temperature before adding the iron is 20.0 °C. What will be the final temp of the system? The specific heat of iron is 0.449 kJ / kg K.

3. 100 g of nickel at 150 oC is placed in 1 L of water at 25 oC. The final temperature of the water is 26.3 oC. Given that the heat capacity of water is 4.18 J g-1 K-1, what is the specific heat of nickel?

4. A certain material’s temperature increases by 1 K for every 1560 J that it gains. A 0.1964 g sample of quinone (molar mass = 108.1 g/mole) was burnt, and the surrounding material’s temperature increased from 20.3 oC to 23.5 oC. Find the molar heat of combustion for quinone.

5. A 50 g sample of 0.2 M NaBr aqueous solution at 23.65 oC is added to a styrofoam calorimeter containing 50 g of 0.2 M AgNO3 aqueous solution at 23.65 oC. If the heat capacity of the calorimeter is 65 J K-1 and the specific heat
of the solution is 4.20 J g-1 K-1 and the final temperature of the solution in the calorimeter is 25.40 oC, calculate the heat released in the reaction.

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