Scenario 3At dinnertime, the soldiers we re miles from a fie ld kitchen. They each pulled out ameal pouch, inserted it into a small bag, and added water. Within 15 minutes, thesoldiers were eating hot meals, which are the U.S. Army's "Meal, Ready-to-Eat," or MRE, TatioEach MRE is a main dish within a pouch made of aluminum foil and plastic. In 1985, researchersat the Army's Natick Research, Development, and Engineering Center invented a way to heatMRES using a special "Flameless Ration Heater," or FRH.Each FRH is a plastic sleeve that holds a pad containing metal particles embedded in a polymericmatrix. The metal is an alloy of 90% magnesium and 10% iron. The entire package has a mass of20.0 g, of which about 8.1 g is magnesium. In the FRH, the water reacts with magnesium in anexothermic reactionThe energy released by this reaction warms the meal to 60°C. To speed the reaction, iron wasadded to the FRH. Both iron and magnesium react readily with warm water but since iron is a lessactive metal than magnesium, the magnesium first reacts. Earlier models of the FRH used morethan 60 mL of water, but the latest version requires only 45 mL.ker notes BackgroundLayoutThemeTransition2 11 II3.5.1 16 111.·7 III I8.9.Mg(s) + 2H,0(1)Mg(OH),(s) + H,(g) + 349 kJCalculate how many mL of water at room temperature are required to react all of the magnesium. Thedensity of water at 25° C is 1.00g/mL.Show work hereAnswer question hereaker notes

Introduction: Moles: As per the international system of unit (SI), mole is the unit of measurement…

Mg(s) + 2H,0(1) Mg(OH),(s) + H,(g) + 349 kJ -> Calculate how many mL of water at room temperature are required to react all of the magnesium. The density of water at 25° C is 1.00g/mL. Show work here

Mg(s) + 2H,0(1) Mg(OH),(s) + H,(g) + 349 kJ -> Calculate how many mL of water at room temperature are required to react all of the magnesium. The density of water at 25° C is 1.00g/mL. Show work here

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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Concept explainers

Thermochemistry

Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.

Exergonic Reaction

The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.

Question

Scenario 3
At dinnertime, the soldiers we re miles from a fie ld kitchen. They each pulled out a
meal pouch, inserted it into a small bag, and added water. Within 15 minutes, the
soldiers were eating hot meals, which are the U.S. Army's "Meal, Ready-to-Eat," or MRE, Tatio
Each MRE is a main dish within a pouch made of aluminum foil and plastic. In 1985, researchers
at the Army's Natick Research, Development, and Engineering Center invented a way to heat
MRES using a special "Flameless Ration Heater," or FRH.
Each FRH is a plastic sleeve that holds a pad containing metal particles embedded in a polymeric
matrix. The metal is an alloy of 90% magnesium and 10% iron. The entire package has a mass of
20.0 g, of which about 8.1 g is magnesium. In the FRH, the water reacts with magnesium in an
exothermic reaction
The energy released by this reaction warms the meal to 60°C. To speed the reaction, iron was
added to the FRH. Both iron and magnesium react readily with warm water but since iron is a less
active metal than magnesium, the magnesium first reacts. Earlier models of the FRH used more
than 60 mL of water, but the latest version requires only 45 mL.
ker notes

Background
Layout
Theme
Transition
2 11 II
3.
5.1 1
6 11
1.·7 III I
8.
9.
Mg(s) + 2H,0(1)
Mg(OH),(s) + H,(g) + 349 kJ
Calculate how many mL of water at room temperature are required to react all of the magnesium. The
density of water at 25° C is 1.00g/mL.
Show work here
Answer question here
aker notes

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