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The non - catalytic cracking of butene ( A ) into butadiene ( A ) and hydrogen ( A ) can be described by the

The non-catalytic cracking of butene (A) into butadiene (A) and hydrogen (A) can be described by the following relationship: r=k*p (where
p is the partial pressure)
k=1.75\*10^10* exp(30200/T) and a reaction enthalpy of 110710 kJ/kmol.
The feed mixture supplied to the reactor consists of butene and inert steam. The reaction temperature is 923 K, and the pressure is 2 bar.
The feed mixture consists of 1kmol/h of butene and 1 kmol/h of steam.
a) What average hydrodynamic residence time must be maintained in an isothermal tubular reactor to convert 90% of the butene?

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