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Which reaction has Hrxn equal to Hf?  Explain. How much energy would be released by the combustion of 100.0 grams C2H2(g)?  Calculate the ΔHrxn for the reaction C2H2(g) → 2C(s) + H2(g)

Which reaction has Hrxn equal to Hf?  Explain. How much energy would be released by the combustion of 100.0 grams C2H2(g)?  Calculate the ΔHrxn for the reaction C2H2(g) → 2C(s) + H2(g)

Chemistry for Engineering Students
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 9.61PAE: 9.61 Silane, SiH4, burns according to the reaction, SiH4+2O2SiO2+2H2O , with H=1429 kJ. How much...
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The table below shows Hvalues for 3 reactions.

  1. Which reaction has Hrxn equal to Hf?  Explain.
  2. How much energy would be released by the combustion of 100.0 grams C2H2(g)? 
  3. Calculate the ΔHrxn for the reaction C2H2(g) → 2C(s) + H2(g). 
Reaction AH, rxn C,H,(g) + 5/2 O,(g) → 2CO,(g) + H,0(1) -1300.0 kJ/mol C(s) + O,(g) → CO,(g) -393.5 kJ/mol 2H,(9) + O,(g) -→ 2H,0() -572.0 kJ/mol
Transcribed Image Text:Reaction AH, rxn C,H,(g) + 5/2 O,(g) → 2CO,(g) + H,0(1) -1300.0 kJ/mol C(s) + O,(g) → CO,(g) -393.5 kJ/mol 2H,(9) + O,(g) -→ 2H,0() -572.0 kJ/mol
Expert Solution
Step 1
  • Enthalpy of Reaction (∆Hrxn):-  It is the energy change which occurs during a reaction.
  • Enthalpy of Formation (∆Hf):-  It is the enthalpy/ energy change during the formation of one mole of compound from it most stable common occurring form.
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