A liquid mixture containing 10 mol% heptane and 90 mol% ethylbenzene is fed at its boiling point to the top of the stripping tower at 101.32 kPa abs. The bottoms are to contain 99% ethylbenzene. For every 5 mol of feed, 3 mol of vapor is withdrawn as product. Calculate the composition of the vapor and the number of theoretical plates required. The equilibrium data below are given as mole fraction heptane.

The lower heating value for gaseous n-octane is 44,791 kJ/kg, and its latent heat of vaporization is 300 kJ/kg. Using this information, determine the enthalpy of formation at 298 K for liquid n-octane in kJ/kmol. (Here you are to compute the enthalpy of formation from the given information, not look it up in a property table.)

A fully charged battery contains 0.02 kmol Ag₂O (silver oxide) and 0.02 kmol Zn (zinc). The battery is initially at a temperature of 21°C. The fully charged battery is then discharged for half an hour under adiabatic conditions (no heat leaves the system). During the half hour of being discharged, the electric current from the battery does 200 kJ of work external to the battery system (none of this external work heats the battery). During this half hour, 0.001 kmol of both reactants are consumed in the net cell discharge reaction: Please see the following table for heat capacities and heats of formation. The heats of formation below show the amount of energy (kJ) needed to form one kmole of each component. If the heat of formation is negative, then forming that species releases energy (to do work or provide heat). Therefore, to create one kmole of silver oxide 29000 kJ energy is released and is generated in the battery (for work or heat), and if one kmole of silver oxide decomposes…

Calculate the heat capacity for formaldehyde at 25°C. Answer should be in kJ/kgmol°C