Correct choice is (b) 457.2 mol/hr
Easiest explanation: Solving for ξ ̇and substituting the corresponding quantities into this equation yields:
The rate in enthalpy change was considered to be negative since the problem is stating that the reaction is releasing energy (exothermic reaction).
Now we can enter the calculated extent of reaction into the equation previously solved for the molar production rate of methanol, to get:
