Answered

Discover a wealth of knowledge at Westonci.ca, where experts provide answers to your most pressing questions. Experience the ease of finding reliable answers to your questions from a vast community of knowledgeable experts. Join our platform to connect with experts ready to provide precise answers to your questions in different areas.

The enthalpy changes, Δ, for three reactions are given.

H2(g)+12O2(g)Ca(s)+2H+(aq)CaO(s)+2H+(aq)⟶H2O(l)⟶Ca2+(aq)+H2(g)⟶Ca2+(aq)+H2O(l)Δ=−286 kJ/molΔ=−544 kJ/molΔ=−193 kJ/mol
Using Hess's law, calculate the heat of formation for CaO(s) using the reaction shown.

Ca(s)+12O2(g)⟶CaO(s)
Δ=____kJ/mol

The Enthalpy Changes Δ For Three Reactions Are Given H2g12O2gCas2HaqCaOs2HaqH2OlCa2aqH2gCa2aqH2OlΔ286 KJmolΔ544 KJmolΔ193 KJmol Using Hesss Law Calculate The He class=

Sagot :

adioabiola

Using Hess's law, the heat of formation for CaO(s) using the reaction shown is; -637 kJ/mol

Definition;

Hess's law states that the standard reaction enthalpy is the sum of the standard enthalpies of the intermediate reactions into which the overall reaction can be divided, while each occurs at the same temperature.

The reaction which represents the formation of CaO(s) and whose heat of formation is to be deter mined is;

  • Ca(s). + 1/2O2(g) ⟶ CaO(s)

Using Hess's law;

The reactions given are;

  1. H2(g). + 1/2O2(g) ⟶ H2O(l). ΔH=−286 kJ/mol
  2. Ca(s). + 2H+(aq) ⟶ Ca2+(aq). + H2(g). ΔH=−544 kJ/mol
  3. CaO(s). + 2H+(aq) ⟶ Ca2+(aq)+H2O(l). ΔH=−193 kJ/mol.

To arrive at the target equation; we must reverse equation 3; so that we have;

Ca2+(aq)+H2O(l). ⟶. CaO(s). + 2H+(aq) ΔH= 193 kJ/mol.

By the aggregation of equations 1 and 2 to the modified equation 3; the net equation is;

Ca(s). + 1/2O2(g) ⟶ CaO(s)

Ultimately, the heat of formation for CaO(s) using the reaction is;

  • ΔH = −286 kJ/mol − 544 kJ/mol + 193 kJ/mol

  • ΔH = -637 kJ/mol.

Read more;

https://brainly.com/question/2514325

Thank you for your visit. We are dedicated to helping you find the information you need, whenever you need it. We appreciate your visit. Our platform is always here to offer accurate and reliable answers. Return anytime. We're glad you chose Westonci.ca. Revisit us for updated answers from our knowledgeable team.