Calculate the number of grams of Mg needed for this reaction to release enough energy to increase the temperature of 71 mL of water from 28°C to 73°C. Express your answer using two significant figures.

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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Can you explain Part B?

v Compiete
I Review | Constants Periodic Table
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) + 2H2O(1)→Mg(OH)2(s) + H2(g).
Calculate the standard enthalpy change for this reaction.
Express your answer using four significant figures.
AHn
= -353.0 kJ
Submit
Previous Answers
Correct
Part B
Calculate the number of grams of Mg needed for this reaction to release enough energy to increase the temperature of 71 mL of
water from 28 °C to 73 °C.
Express your answer using two significant figures.
Submit
Previous Answers
Answer Requested
Transcribed Image Text:v Compiete I Review | Constants Periodic Table 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) + 2H2O(1)→Mg(OH)2(s) + H2(g). Calculate the standard enthalpy change for this reaction. Express your answer using four significant figures. AHn = -353.0 kJ Submit Previous Answers Correct Part B Calculate the number of grams of Mg needed for this reaction to release enough energy to increase the temperature of 71 mL of water from 28 °C to 73 °C. Express your answer using two significant figures. Submit Previous Answers Answer Requested
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