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Flameless ration heaters are used to warm military MREs (meals ready-to-eat). A heater consists of a pouch  containing 7.5 g of a metal alloy powder that is 95% Mg.  According to the instructions, 30 mL of water should  be added to the pouch. The resulting reaction produces  aqueous magnesium hydroxide and hydrogen gas. Over  the course of 12 minutes, the temperature of an 8.0-oz.  eal in contact with the heater increases by 100°F.   (a) Write a balanced chemical equation for the reaction that occurs when water is added to the pouch.   (b) Determine ΔH° for the reaction. (c) Calculate q of the reaction. (d) Calculate the heat capacity of the food.  (Assume that the density of water is 0.998 g/cm3; and  that the reaction is the system, and the water and food  together constitute the surroundings.)

Flameless ration heaters are used to warm military MREs (meals ready-to-eat). A heater consists of a pouch  containing 7.5 g of a metal alloy powder that is 95% Mg.  According to the instructions, 30 mL of water should  be added to the pouch. The resulting reaction produces  aqueous magnesium hydroxide and hydrogen gas. Over  the course of 12 minutes, the temperature of an 8.0-oz.  eal in contact with the heater increases by 100°F.   (a) Write a balanced chemical equation for the reaction that occurs when water is added to the pouch.   (b) Determine ΔH° for the reaction. (c) Calculate q of the reaction. (d) Calculate the heat capacity of the food.  (Assume that the density of water is 0.998 g/cm3; and  that the reaction is the system, and the water and food  together constitute the surroundings.)

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Flameless ration heaters are used to warm military MREs (meals ready-to-eat). A heater consists of a pouch  containing 7.5 g of a metal alloy powder that is 95% Mg.  According to the instructions, 30 mL of water should  be added to the pouch. The resulting reaction produces  aqueous magnesium hydroxide and hydrogen gas. Over  the course of 12 minutes, the temperature of an 8.0-oz.  eal in contact with the heater increases by 100°F.  

(a) Write a balanced chemical equation for the reaction that occurs when water is added to the pouch.  

(b) Determine ΔH° for the reaction.

(c) Calculate q of the reaction.

(d) Calculate the heat capacity of the food.  (Assume that the density of water is 0.998 g/cm3; and  that the reaction is the system, and the water and food  together constitute the surroundings.)

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