If compound A reacts with B following first order kinetics with rate constant 2 . 011 × 10 - 3 s - 1 . The time taken by A (in seconds) to reduce from 7 g to 2 g will be _____ . (Nearest Integer) log 5 = 0 . 698 , log 7 = 0 . 845 , log 2 = 0 . 301

Question

If compound A reacts with B following first order kinetics with rate constant 2 . 011 × 10 - 3 s - 1 . The time taken by A (in seconds) to reduce from 7 g to 2 g will be _____ . (Nearest Integer) log 5 = 0 . 698 , log 7 = 0 . 845 , log 2 = 0 . 301,

MARKS App · Accepted Answer

Given, A + B → P t = 0 7 g t = t 2 g at constant volume From formula of first order kinetics: ⇒ t = 2 . 303 K log A 0 A t = 2 · 303 2 · 011 × 10 - 3 log 7 2 = 2 · 303 × 0 . 544 2 · 011 × 10 - 3 = 622 . 989 ≈ 623

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