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7.71 Ready-to-eat meals used by military personnel and campers can be heated on a flameless heater....

7.71 Ready-to-eat meals used by military personnel and campers can be heated on a flameless heater. The source of energy in the heater is the reaction repre- sented by Mg(s) + 2 H2O(0) - Mg(OH)2(s) + H2(g) Calculate the standard enthalpy change at 25 °C for this reaction. What quantity of magnesium is needed to supply the heat required to warm 25 mL of water (d = 1,00 g mL-') from 25 °C to 85 °C?

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