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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