Complete Question  
The complete question is shown on the first question
Answer:
a) The duty of the heat exchanger is given as 6.8658 KJ /sec
b) The temperature of the water leaving the exchanger is TOUT = 29.84 ⁰C
c) The log mean difference is given as TZ = 47.317 ⁰ C
d) the UA value is UA = 145.10
Explanation:
The explanation is uploaded on the first and second ,third and fourth image
 
        
             
        
        
        
Answer:
molar composition for liquid 
xb= 0.24
xt=0.76
molar composition for vapor 
yb=0.51
yt=0.49 
Explanation:
For an ideal solution we can use the Raoult law.
Raoult law: in an ideal liquid solution, the vapor pressure for every component in the solution (partial pressure) is equal to the vapor pressure of every pure component multiple by its molar fraction.  
For toluene and benzene would be:

 
Where:
 is partial pressure for benzene in the liquid
 is partial pressure for benzene in the liquid  
 is benzene molar fraction in the liquid
 is benzene molar fraction in the liquid  
 vapor pressure for pure benzene.
 vapor pressure for pure benzene.  
The total pressure in the solution is:
 
And  
 
Working on the equation for total pressure we have:
 
Since  
 
We know P and both vapor pressures so we can clear  from the equation.
 from the equation.
 
 
So  
 
To get the mole fraction for the vapor we know that in the equilibrium:
 
 
So  
 
 
 
Something that we can see in these compositions is that the liquid is richer in the less volatile compound (toluene) and the vapor in the more volatile compound (benzene). If we take away this vapor from the solution, the solution is going to reach a new state of equilibrium, where more vapor will be produced. This vapor will have a higher molar fraction of the more volatile compound. If we do this a lot of times, we can get a vapor that is almost pure in the more volatile compound. This is principle used in the fractional distillation.
 
        
             
        
        
        
Explanation:
IM PRETTY SURE IT IS D !! IF ITS WRONG IM SORRY THAT WHAT
 I GOT
 
        
                    
             
        
        
        
C ! ..........................
        
                    
             
        
        
        
The speed of sound depends on these two things: The type of medium and the temperature of the medium; option a.
<h3>What is the speed of sound?</h3>
The speed of sound is the distance covered in meters over a given period of time.
Speed = distance/time
The speed of sound depends on the following:
- temperature - the speed of sound increases with temperature
- medium - the speed of sound increases with increase in density of the medium.
In conclusion, the speed of sound increases with temperature.
Learn more about speed of sound at: brainly.com/question/95976
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