Bomb Calorimetry: Solving for Heat of Dissolution in NH4NO3

In summary, bomb calorimetry is a technique that measures the heat released or absorbed during a chemical reaction by igniting a sample in a sealed container surrounded by excess oxygen. It can be used to solve for the heat of dissolution in substances like NH4NO3, but factors such as equipment quality and reaction conditions can affect the accuracy of measurements. Bomb calorimetry can be used for any substance that can be ignited and dissolved in water, and it has various applications in industries such as food, environmental studies, and chemical research.
  • #1
viper2308
19
0
Need help! I tried using the equation: Heat evolved= (specific heat)(Mass of Solution)(Change in Temp) but I cannot get the right answer.

In a coffee-cup calorimeter, 1.30 g of NH4NO3 is mixed with 75.0 g of water at an initial temperature of 25.00°C. After dissolution of the salt, the final temperature of the calorimeter contents is 23.19°C. Assuming the solution has a heat capacity of 4.18 J/°C·g and assuming no heat loss to the calorimeter, calculate the enthalpy change for the dissolution of NH4NO3 in units of kJ/mol.
 
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  • #2
((1.3+75)x4.18x1.81x0.001)kJ / (1.30/80)mol = 35.5 kJ/mol
 

1. What is bomb calorimetry and how does it work?

Bomb calorimetry is a technique used to measure the heat released or absorbed during a chemical reaction. It involves placing a sample of a substance in a sealed container, called a bomb, and igniting it in the presence of excess oxygen. The heat released from the reaction is then measured by the change in temperature of the surrounding water.

2. How is bomb calorimetry used to solve for the heat of dissolution in NH4NO3?

In bomb calorimetry, the heat of dissolution is determined by measuring the heat released when NH4NO3 dissolves in water. The NH4NO3 is placed in the bomb and ignited, causing it to dissolve in the surrounding water. The change in temperature of the water is then used to calculate the heat of dissolution.

3. What factors can affect the accuracy of bomb calorimetry measurements?

Several factors can affect the accuracy of bomb calorimetry measurements, including the quality of the equipment, the purity of the sample, and the reaction conditions. Any errors in measurement or calculation can also impact the accuracy of the results.

4. Can bomb calorimetry be used to measure the heat of dissolution for any substance?

Yes, bomb calorimetry can be used to measure the heat of dissolution for any substance that can be ignited and dissolved in water. However, the technique is most commonly used for measuring the heat of combustion for organic compounds.

5. What are some common applications of bomb calorimetry?

Bomb calorimetry is commonly used in the food industry to determine the caloric content of foods. It is also used in environmental studies to measure the energy content of fuels and in chemical research to study the heat released in various reactions.

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