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Meals-ready-to-eat (MREs) are military meals that can be heated on a flameless heater. The heat is produced by the following reaction: Mg(s) + 2 H2O(l) ? Mg(OH)2(s) + H2(g)

a) Calculate the standard enthalpy change for this reaction using DHof values from Appendix C.

b) Suppose this reaction is used to heat a sample of water. Calculate the heat required to raise the temperature of 125 mL of water from 22.3 ?C to 74.8 ?C.

c) Calculate the grams of Mg Description: {\rm Mg}needed to supply this amount of heat.

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