I just was wondering how to use these equations at the top to find the H for the 3rd reaction in part b. Thanks! 154) Verifying Hess's Lawa) Write out Net Ionic Equation for reaction 1 and 2 and show AH for eachReaction 1:AH::-653528 KJH*laql+ OH"laq)→ H,0(2)AH;: -491.3004LKJReaction 2:Mals)+2Ht Mg +H, (g)laq)laq'b) Use reactions 1 and 2 and Hess’ law to find the AH for reaction 3, given here:Mg(s) + 2H2O(1) → Mg ²* (ag) + 20H (ag) + H2(g)AH3, Hess' Law :c) Use the net ionic equation for reaction 3 to look up the AHf values in your textbook. Usethese values to calculate a theoretical value for AH3 or the "textbook" calc.Mg(s)+2H,0(4)→ ag) + Hzlg)Mglag)+20HT

Hess’s law states that when chemical equations are combined algebraically, their enthalpies can be…

a) Write out Net Ionic Equation for reaction 1 and 2 and show AH for each Reaction 1: AH1:-653528 KT H*laql+ OH"laq)- → H,0le) AH;: -491.3004LKJ Reaction 2: +2H* Mg +Hg) 2+ (aq) lag) b) Use reactions 1 and 2 and Hess' law to find the AH for reaction 3, given here: Mg(s) + 2H2O(1) → Mg ²" (ag) + 20H (ag) + H2(g) AH3, Hess' Law : c) Use the net ionic equation for reaction 3 to look up the AHf values in your textbook. Use these values to calculate a theoretical value for AH3 or the "textbook" calc. Mglsi+2H,0(4)→Mg* lag) + 20HT ag) + Halg)

a) Write out Net Ionic Equation for reaction 1 and 2 and show AH for each Reaction 1: AH1:-653528 KT Hlaql+ OH"laq)- → H,0le) AH;: -491.3004LKJ Reaction 2: +2H Mg +Hg) 2+ (aq) lag) b) Use reactions 1 and 2 and Hess' law to find the AH for reaction 3, given here: Mg(s) + 2H2O(1) → Mg ²" (ag) + 20H (ag) + H2(g) AH3, Hess' Law : c) Use the net ionic equation for reaction 3 to look up the AHf values in your textbook. Use these values to calculate a theoretical value for AH3 or the "textbook" calc. Mglsi+2H,0(4)→Mg* lag) + 20HT ag) + Halg)

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter9: Energy And Chemistry

Section: Chapter Questions

Problem 9.94PAE

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