Chemistry-(general)
NEET Chemistry (general) MCQ Question
Type: MCQ-numerical-Hard-Class 12
For a first-order reaction A(g) → B(g) + C(g), the initial pressure of A is 2 atm. If the total pressure at time t is 3 atm, what is the rate constant k in s^-1 given that t = 500 seconds?
A
0.00139
B
0.00277
C
0.00415
D
0.00554
Correct Answer
Option A
Detailed Explanation
Using the formula k = (2.303/t) * log(p_i / (2p_i - p_t)), where p_i is the initial pressure and p_t is the total pressure at time t. Here, k = (2.303/500) * log(2 / (4 - 3)) = 0.00139 s^-1.
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