Make a graph of the partial pressure of butadiene as a function of time, using the data in the previous problem. Find the slope of the tangent line at 33.00 min and deduce the rate constant from it. Compare with the result from the previous problem.

Previous Problem

Vaughan obtained the following data for the dimerization of butadiene at 326 ^◦C.

Time (min)        Partial pressure of butadiene (atm) 0 to be deduced
3.25........................................................0.7961
8.02........................................................0.7457
12.18......................................................0.7057
17.30......................................................0.6657
24.55......................................................0.6073
33.00......................................................0.5573
42.50......................................................0.5087
55.08......................................................0.4585
68.05......................................................0.4173
90.05......................................................0.3613
119.00....................................................0.3073
259.50.....................................................0.1711
373.00.....................................................0.1081

Determine whether the reaction is first, second, or third order. Find the rate constant, ignoring systematic errors. Find the initial pressure of butadiene.