Question Detail

CHM 101 Thermochemistry II Objective Question
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Question

How is reaction enthalpy estimated using bond enthalpies?
Options
A ΔH°ᵣₓₙ ≈ ΣD_bonds formed - ΣD_bonds broken
B ΔH°ᵣₓₙ ≈ ΣD_bonds broken - ΣD_bonds formed
Correct Answer
C ΔH°ᵣₓₙ ≈ ΣD_bonds broken + ΣD_bonds formed
D ΔH°ᵣₓₙ ≈ ΣD_bonds formed / ΣD_bonds broken
Correct Answer

Option B is the correct answer.

Detailed Explanation

ΔH°ᵣₓₙ ≈ ΣD_bonds broken - ΣD_bonds formed. Bonds broken (reactants) require energy (positive), bonds formed (products) release energy (subtract).

Hint

The notes provide this formula.

Question Info

Course: CHM 101
Topic: Thermochemistry II
Type: Objective
Difficulty: Not specified
Question 824 of 1872
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