A Gas-Phase Decomposition Is First-Order with Respect to the Reactant

question 70

Multiple Choice

A gas-phase decomposition is first-order with respect to the reactant, R. If the initial concentration of R is 1.0 × 10^-4 mol L^-1 and the rate constant k = 1.08 × 10^-6 s^-1, what concentration of R remains after 25 days?

• A) 1.0 × 10^-3 mol L^-1
• B) 1.0 × 10^-4 mol L^-1
• C) 9.6 × 10^-5 mol L^-1
• D) 4.3 × 10^-5 mol L^-1
• E) 9.7 × 10^-6 mol L^-1

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Definitions:

Phylogenetic Systematics

A method of classifying living organisms based on their evolutionary relationships, using traits inherited from common ancestors.

Derived

A term used to describe traits, characteristics, or features that have evolved in a particular species or lineage from an ancestral state, indicating evolutionary change.

Platypuses

Aquatic mammals native to Australia known for their unique characteristics such as laying eggs, having bill and webbed feet.

Therians

Mammals excluding the monotremes, comprising the live-bearing marsupials and placental mammals, characterized by traits such as viviparity and mammary glands.