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iPad 1:45 PM D UVU Login Servic × 'MyLab and Mast: × ' D Cours MasteringChemis × https/session.masteringchemistry.com/myct/itemvie.. HW10Procedure for Using Hess's Law previous17 of 24 |next s Procedure for Using Hess's Law Leaming Goal: To understand how to use Hess's law to find the enthalpy of an overal reaction. The change in enthaky.H.as the heat absorbed or produced during any reaction at constat pressure Hess's law states tat Hfor an overall reaction is thhe sum ofthe 1{ values for th·individual reactons. For example, two wanted to know the entalpy change for the reaction we coud calculase it using the enthalpy values for the folowing individual steps Step 1: 4A1 + 3022A1203 Overall: 3Mn + 30 3Mno, the e thalpy change is 3352 kJ/mol fo step 1 and 1792 kJ/molor step 2 then the enaloy change for the overal reactoncalculated as folows H=-3352 + 1792.-1560 kJ/mol is also mportant to note that the change in enthapyastatefuncton, meaning itindependent of path. In other words, the sum of the H values for any set of reactions that produce the desired product from the starting materials gives the same overall H Now consider folowing set of reactors Part A The equations given in the problem inroduction can be added together to give the following reaction overail: N204+2NO+0 However, one of them must be reversed. Which one? ·Hints reaction1: N201+NO reaction 2: N2+02-2N0 My Answers Give Up Part B This question will be shown after you complete previous question(s) Part C This question will be shown after you complete previous question(s)

Explanation / Answer

Part A:

Reaction 1: N2 + 2O2 ------> N2O4

Reaction 2: N2 + O2 -----> 2NO

Reverse the reaction 1 and adds to the reaction 2.

N2O4 -------> N2 + 2O2

N2 + O2 -----> 2NO

------------------------------------

N2O4 -------> 2 NO + O2

So, the answer is reaction 1.

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