Conversion of mass to moles a continuous feed to a separation unit is 1,000 kg/h of 45 wt% methanol and 55 wt% water, whose molecular weights are 32 and 18, respectively. compute: (a) feed rate in lbmol/h, and (b) composition in mole fractions.

Total feed rate = 98.3 lbmol/h

methanol mole fraction = 0.315

water mole fraction = 0.685

Explanation:

First of all, it is needed to calculate the feed mass of methanol and water in kg/h.

For methanol:

For water:

Now, change from mass units (kg/h) to moles units (kmol/h and lbmol/h) using simple conversion factors:

For methanol:

For water:

Change units from kmol/h to lbmol/h

For methanol:

For water:

Sum moles of methanol and water in lbmol/h to compute the total feed rate:

Divide both methanol and water moles feed rates by total feed rate:

For methanol:

For water:

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