1)  Check if the molar flow rate of Inlet1+Inlet2 = mixer-out and Inlet1+Inlet2 = Vapour+Liquid
    Check if the flow rate of the Vapour stream is equal to the flow rate of vapour fraction in mixer-out
    Do the same thing for Liquid

2) Check if the mole fractions of benzene and toluene in mixer-out = that of Liquid

3) As the Separator has 6 inputs, Inlet1 and Inlet2 can directly be connected to two input ports - do this
   Remove the mixer and mixer-out
   See if you get the same answers

4) Click on Separator
   Change Override separation temperature to true
   Change the resulting temperature value to 100◦ C
   Bring Energy stream from Object Palette to the Flowsheet
   Connect this stream to the Energy Stream of the Separator
   Simulate and analyse your results