Stripping ammonia from air into water (backhurst ex. 2-2 modified) it is desired to produce 100 kg of a solution of ammonia in wate rcontaining 10% by mass of ammonia. this will be achived by stripping ammonia from an ammonium-air mixture by water in a counter-current absorption tower. the inlet gas stream contains 20% ammonia by mass and the outlet gas 2% ammonia by mass. assume that air and water do not mix during the process. a) draw a process diagram. b) determine dof c) calculate the mass of ammonia-air which should be fed to the column.

For cyclohexane compounds drawn in a chair conformation:   -axial bonds are vertical  -equatorial bonds are parallel to two bonds within the ring.  thus, as i assume the chair conformation is drawn:   -the x group is in an axial position, as are the five other vertical bonds.  -three axial bonds are on the top face of the ring  -the other three axial bonds are on the bottom face  the position of the second substituent on each ring carbon is equatorial.  gauche groups must be on an adjacent carbon such as carbon 6 and carbon 2, and also gauche groups are rotated by 60 degrees relative to each other.  drawing the newman projections for c1–c2 and c1–c6 aids in visualizing the groups that are gauche to the y group on c1.  click this link and watch some academic videos that may you more understand the topic 

They can measure  the amount of energy gained or lost

You would do 1500/4 and the answer is 375

The state or quality of being humid.a quantity representing the amount of water vapor in the atmosphere or a gas.