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Modern Chemistry: Student Edition 2006 | 1st Edition | ISBN: 9780030391071 | Authors: R. Thomas Myers, Keith B. Oldham, Salvatore Tocci
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Use tabulated values of standard enthalpies of formation

Chapter 10, Problem 10.1.80

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QUESTION:

Use tabulated values of standard enthalpies of formation to calculate the enthalpy change accompanying the reaction 4Al(s) + 6H2O(l) 2Al2O3(s) + 6H2(g). Is the reaction exothermic?

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QUESTION:

Use tabulated values of standard enthalpies of formation to calculate the enthalpy change accompanying the reaction 4Al(s) + 6H2O(l) 2Al2O3(s) + 6H2(g). Is the reaction exothermic?

ANSWER:

Step 1 of 3

Among several reactions, some of them take up energy, whereas several other reactions involve energy evolution. So a change in enthalpy is experienced during a reaction. This enthalpy change is termed the enthalpy of a reaction.

Standard enthalpy of formation constitutes the enthalpy change when a mole of a particular substance is generated from its elements. The temperature at this state is 298.15 K, and pressure is 1 atm.

 

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