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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