Question

Attempt All Q1] A) The following changes in total pressure p at constant volume with timet was observed for the reaction CH, -+ CH+H, at 856 K. p/torr 384 390 394 396 400 405 408 t/s 0 29 50 64 84 114 134 Determine the rate constant at this temperature. (7+ 4 Marks) B) Drive the equation key come in

Answer 1

A)

Typical 1st order reaction will give a straight line between ln (C) versus t.

P (torr) t(s) -4.86 0.5 1 1.5 2 2.5 29 -4.87 384 390 394 396 50 64 C(mol/L) (=P/(760*0.08206*856)) In (C) t(min) 0.007193038 -4.93464 0 0.007305429 -4.91914 0.483333 0.007380357 -4.90893 0.833333 0.00741782 -4.90387 1.066667 0.007492748 -4.89382 1.4 0.007586407 -4.8814 1.9 0.007642603 -4.87402 2.233333 y = 0.027x -4.932 R? = 0.996 -4.88 84 -4.89 400 405 (b) -4.9 114 134 up 408 -4.91 -4.92 -4.93 -4.94

Here from graph we get the straight line.

Slope = rate constant = 0.027 min^-1

B) Significance of a, x' must be mentioned. What are they? The equation is not understandable. Also according to the HOMEWORKLIB POLICY only 1st question needed to be answered.