A First-Order Reaction Has a Half-Life of 20

question 58

Multiple Choice

A first-order reaction has a half-life of 20.0 minutes. Starting with 1.00 × 10²⁰ molecules of reactant at time t = 0, how many molecules remain unreacted after 100.0 minutes?

• A)1.00 × 10 ⁴ molecules
• B)2.00 × 10 ¹⁹ molecules
• C)3.20 × 10 ¹⁶ molecules
• D)5.00 × 10 ²⁰ molecules
• E)None of these choices are correct.

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Definitions:

Marginal Cost

The additional expense incurred from producing one more unit of a good or service, which is crucial for decision-making in production and pricing.

Tennessee Valley Authority

a U.S. government agency established in 1933 to address a wide range of environmental, economic, and technological issues in the Tennessee Valley region.

Government Owned

Entities or assets that are owned, controlled, or operated by the government or a public authority.

Peak Efficiency

Peak efficiency is the maximum operational effectiveness where a process or system operates at its highest level of productivity with minimal waste.