alleryA first-order reaction with rate constant k = 5.5 × 10⁻¹⁴ s⁻¹ has a half-life of approximately:
A1.26 × 10¹⁴ s
B1.26 × 10¹³ s
C1.26 × 10¹² s
D3.8 × 10¹³ s
Answer & Solution
Correct answer: B. 1.26 × 10¹³ s
t_(1/2) = 0.693/k = 0.693 / (5.5 × 10⁻¹⁴) = **1.26 × 10¹³ s** (~400 000 years).
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