Answer:
Effectiveness and cold stream output temperature of the heat exchange Increases. So, Answer is b) Increases.
Explanation:
We have a heat exchanger, and it is required to compare the effectiveness and cold stream output if the length is increased.
Heat exchangers are engineering devices used to transfer energy. Thermal energy is transferred from Fluid 1 - Hot fluid (HF) to a Fluid 2 - Cold Fluid (CF). Both fluids 1 and 2 can flow with different values of mass flow rate and different specific heat. When the streams go inside the heat exchanger Temperature of Fluid 1 (HF) will decrease, at the same time Temperature of the Fluid 2 (CF) will increase.
In this case, we need to analyze the behavior taking into account different lengths of heat exchangers. If the length of the heat exchanger increases, it means the transfer area will increases. Heat transfer will increase if the transfer area increases. In this sense, the increasing length is the same than increase heat transfer.
If the heat transfer increases, it means Fluid 1 (HF) will reduce its temperature, and at the same time Fluid 2 (CF) will increase its temperature.
Finally, Answer is b) Effectiveness and cold stream output temperature increases when the length of the heat exchanger is increased.
Explanation:
SOLID
Sodium hydroxide exists in the solid phase at room temperature. You would find it in the lab as hemispherical white solid pellets. The phase of a substance depends on temperature and pressure. As you heat a solid, it will melt and change to the liquid phase.
Answer: Option (c) is the correct answer.
Explanation:
When an acid or base is added to a solution then any resistance by the solution in changing the pH of the solution is known as a buffer.
This is because a buffer has the ability to not get affected by the addition of small amounts of an acid or a base. As a result, it helps in maintaining the pH of the solution.
In the give case, when we add the HCl then more number of protons will dissociate. This causes the acetate to react with the protons and leads to the formation of acetic acid.
We know that acetic acid is a weak acid and it dissociates partially or feebly. Therefore, no change in pH will take place.
Thus, we can conclude that equation
represents the chemical reaction that accounts for the fact that acid was added but there was no detectable change in pH.
Answer:
![M_f=38.8\%](https://tex.z-dn.net/?f=M_f%3D38.8%5C%25)
Explanation:
From the question we are told that:
Pressure ![P=747mmHg](https://tex.z-dn.net/?f=P%3D747mmHg)
Temperature ![T=298K](https://tex.z-dn.net/?f=T%3D298K)
Volume ![V=11.1](https://tex.z-dn.net/?f=V%3D11.1)
Heat Produced ![Q=780kJ](https://tex.z-dn.net/?f=Q%3D780kJ)
Generally the equation for ideal gas is mathematically given by
![PV=nRT](https://tex.z-dn.net/?f=PV%3DnRT)
![n= (747/760) *11.1/ (0.0821*298)](https://tex.z-dn.net/?f=n%3D%20%28747%2F760%29%20%2A11.1%2F%20%280.0821%2A298%29)
![n=0.446mol](https://tex.z-dn.net/?f=n%3D0.446mol)
Therefore
![x+y=0.446](https://tex.z-dn.net/?f=x%2By%3D0.446)
![x=0.446-y .....1](https://tex.z-dn.net/?f=x%3D0.446-y%20.....1)
Since
Heat of combustion of Methane=889 kJ/mol
Heat of combustion of Propane=2220 kJ/mol
Therefore
![x(889) + y(2220) = 760 ...... 2](https://tex.z-dn.net/?f=x%28889%29%20%2B%20y%282220%29%20%3D%20760%20......%202)
Comparing Equation 1 and 2 and solving simultaneously
![x=0.446-y .....1](https://tex.z-dn.net/?f=x%3D0.446-y%20.....1)
![x(889) + y(2220) = 760 ...... 2](https://tex.z-dn.net/?f=x%28889%29%20%2B%20y%282220%29%20%3D%20760%20......%202)
![x=0.173](https://tex.z-dn.net/?f=x%3D0.173)
![y=0.273](https://tex.z-dn.net/?f=y%3D0.273)
Therefore
Mole fraction 0f Methane is mathematically given as
![M_f=\frac{x}{n}*100\%](https://tex.z-dn.net/?f=M_f%3D%5Cfrac%7Bx%7D%7Bn%7D%2A100%5C%25)
![M_f=\frac{1.173}{0.446}*100\%](https://tex.z-dn.net/?f=M_f%3D%5Cfrac%7B1.173%7D%7B0.446%7D%2A100%5C%25)
![M_f=38.8\%](https://tex.z-dn.net/?f=M_f%3D38.8%5C%25)
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Fun FACT : An apple, potato, and onion all taste the same if you eat them with your nose plugged