At a Particular Temperature, N₂O₅ Decomposes According to a First-Order

question 58

Multiple Choice

At a particular temperature, N₂O₅ decomposes according to a first-order rate law with a half-life of 3.0 s. If the initial concentration of N₂O₅ is 1.0 × 10¹⁶ molecules/cm³, what will be the concentration in molecules/cm³ after 10.0 s?

• A) 6.3 × 10³
• B) 9.9 × 10¹⁴
• C) 9.4 × 10²
• D) 7.3 × 10⁹
• E) 1.8 × 10¹²

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Definitions:

Echinodermata

A phylum of marine animals including sea stars, sea urchins, and sea cucumbers, characterized by radial symmetry and a unique water vascular system.

Echinoderms

A phylum of marine animals that includes starfish, sea urchins, and sea cucumbers, characterized by radial symmetry and a unique water vascular system.

Radial Symmetry

A symmetrical arrangement of parts around a central axis, as seen in many aquatic organisms, allowing them to interact with their environment from any direction.

Endoskeleton

An internal support structure of the body, found in vertebrates, consisting of bones and cartilages.