CWhat is the new value of A, H for Reaction 1, as now written? Original: New: 4 B(s) + 3 O₂(g) → 2 B₂O3(s) AH = -2543.8 kJ/mol-rxn 2 B(s) + 3/2 O₂(g) → B₂O3(s) ▲,H° = ? A, HⓇ = kJ/mol-rxn
CWhat is the new value of A, H for Reaction 1, as now written? Original: New: 4 B(s) + 3 O₂(g) → 2 B₂O3(s) AH = -2543.8 kJ/mol-rxn 2 B(s) + 3/2 O₂(g) → B₂O3(s) ▲,H° = ? A, HⓇ = kJ/mol-rxn
Chemistry & Chemical Reactivity
10th Edition
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter5: Principles Of Chemical Reactivity: Energy And Chemical Reactions
Section: Chapter Questions
Problem 81GQ: The standard molar enthalpy of formation of diborane, B2H6(g), cannot be determined directly because...
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Transcribed Image Text:C What is the new value of A, Hᵒ for Reaction 1, as now written?
Original:
New:
A, HⓇ
4 B(s) + 3 O₂(g) → 2 B₂O3 (s) A₁H° = -2543.8 kJ/mol-rxn
2 B(s) + 3/2 O₂(g) → B₂O3(s) ▲,H° = ?
=
kJ/mol-rxn
Transcribed Image Text:This question has multiple parts. Work all the parts to get the most points.
The standard molar enthalpy of formation of diborane, B₂H₁ (g), cannot be determined directly because the compound cannot be prepared by the reaction of boron
and hydrogen. It can be calculated from other enthalpy changes, however. The following enthalpy changes can be measured.
4 B(s) + 3 O₂(g) → 2 B₂ O3 (s)
A, H = -2543.8 kJ/mol-rxn
H₂(g) + 1/2 O₂ (g) → H₂O(g)
▲,H° = −241.8 kJ/mol-rxn
B2 H6 (g) + 3 O2 (g) → B2 O3 (g) + 3 H₂O(g) A₁H° = −2032.9 kJ/mol-rxn
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