The figure below shows a self-cooling beverage can. The can is equipped with an outer jacket containing
Question:
The figure below shows a “self-cooling” beverage can.
The can is equipped with an outer jacket containing sodium carbonate (Na2CO3), which dissolves in water rapidly and endothermically:
Na2CO3(s) → 2 Na+(aq) + CO3 2-(aq) ΔH° = 67.7 kJ The user adds water to the outer jacket, and the heat absorbed in the chemical reaction chills the drink. The can contains 200 g of drink, the jacket contains 55 g of Na2CO3, and 100 g of water is to be added. If the initial temperatures of the can and the water are both 328C on a summer day, what is the coldest temperature that the drink can reach? The can itself has a heat capacity of 40 J/8C.
Assume that the Na2CO3 solution and the drink both have the same heat capacity as pure water, 4.184 J g-1 °C-1.
Step by Step Answer:
Chemistry For Engineering Students
ISBN: 9780357026991
4th Edition
Authors: Lawrence S. Brown, Tom Holme