19. The reaction 2NOBr (g) → 2 NO (g) + Br2 (g) is a second-order reaction with a rate constant of 0.80 M-1s-1 at 11 °C. If the initial concentration of NOBr is 0.0440 M, the concentration of NOBr after 6.0 seconds is . A) 0.0276 M B) 0.0324 M C) 0.0363 M D) 0.0348 M E) 0.0402 M

(C)The concentration of NOBr after 6 seconds is 0.0363

Explanation:

 The second order equation is given by

k= rate constant= 0.8

T= time = 6s

Ro= initial concentration = 0.044

= 0.8*6+

= 27.53

R= 1/27.53 = 0.0363

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