Hydrogen Gas and Bromine Gas React to Form Hydrogen Bromide

question 16

Multiple Choice

Hydrogen gas and bromine gas react to form hydrogen bromide gas.How much heat (kJ) is released when 155 grams of HBr is formed in this reaction? ΔH° = -72 kJ.

• A)137
• B)69
• C)-69
• D)-137
• E)1.12 × 10⁵

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Definitions:

Availability Heuristic

A mental shortcut that relies on immediate examples that come to mind when evaluating a specific topic, concept, method, or decision.

Overconfidence

A cognitive bias where an individual's subjective confidence in their own abilities is greater than their objective accuracy.

Representativeness Heuristic

A mental shortcut that involves making a decision based on how closely a new situation or object resembles a prototype or typical case.

Fixation

The inability to see a problem from a new perspective, by employing a different mental set.