The water in a pressure cooker boils at a temperature greater than 100°C because it is under pressure. At this higher temperature, the chemical reactions associated with the cooking of food take place at a greater rate. (a) Some food cooks fully in 7.00 min in a pressure cooker at 111.0°C and in 49.0 minutes in an open pot at 100.0°C. Calculate the average activation energy for the reactions associated with the cooking of this food.
The water in a pressure cooker boils at a temperature greater than 100°C because it is under pressure. At this higher temperature, the chemical reactions associated with the cooking of food take place at a greater rate. (a) Some food cooks fully in 7.00 min in a pressure cooker at 111.0°C and in 49.0 minutes in an open pot at 100.0°C. Calculate the average activation energy for the reactions associated with the cooking of this food.
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Transcribed Image Text:**Pressure Cooking and Boiling Point: A Study on Cooking Rates and Activation Energy**
When using a pressure cooker, water boils at a temperature greater than 100°C because it is under pressure. This elevated temperature increases the rate of chemical reactions involved in cooking food.
**Exercise:**
**(a)** Evaluate the scenario where food cooks completely in a pressure cooker at 111.0°C within 7.00 minutes and takes 49.0 minutes to cook in an open pot at 100.0°C. Determine the average activation energy for the chemical reactions involved in cooking this food.
- **Answer:** \( \boxed{\text{kJ mol}^{-1}} \)
**(b)** Calculate the cooking time for the same food in an open pot at an altitude of 9500 feet, where the boiling point of water is 90.3°C.
- **Answer:** \( \boxed{\text{min}} \)
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