Answer:
Cost to supply enough vanillin is ![3.2\$](https://tex.z-dn.net/?f=3.2%5C%24)
Explanation:
Threshold limit of vanillin in air is
per litre means there should be
of vanillin in 1L of air to detect aroma of vanillin.
![1ft^{3}=28.32L](https://tex.z-dn.net/?f=1ft%5E%7B3%7D%3D28.32L)
So, ![5.0\times 10^{7}ft^{3}=(5.0\times 10^{7}\times 28.32)L](https://tex.z-dn.net/?f=5.0%5Ctimes%2010%5E%7B7%7Dft%5E%7B3%7D%3D%285.0%5Ctimes%2010%5E%7B7%7D%5Ctimes%2028.32%29L)
So amount of vanillin should be present to detect = ![(2.0\times 10^{-11}\times 5.0\times 10^{7}\times 28.32)g](https://tex.z-dn.net/?f=%282.0%5Ctimes%2010%5E%7B-11%7D%5Ctimes%205.0%5Ctimes%2010%5E%7B7%7D%5Ctimes%2028.32%29g)
As cost of 50 g vanillin is
therefore cost of
vanillin = ![(2.0\times 10^{-11}\times 5.0\times 10^{7}\times 28.32\times 112)\$ = 3.2\$](https://tex.z-dn.net/?f=%282.0%5Ctimes%2010%5E%7B-11%7D%5Ctimes%205.0%5Ctimes%2010%5E%7B7%7D%5Ctimes%2028.32%5Ctimes%20112%29%5C%24%20%3D%203.2%5C%24)
1. C
2. B
3. B
4. sorry, but we cant see the pictures. thats all I can do.
-Chad
Letter C on the model titration curve corresponds to the point where pH equals the numerical value of pKa for HPr
<h3>What is a titration curve?</h3>
A titration curve is a graph of the pH of a solution against increasing volumes of an acid or a base that is added to the solution.
The pH of a solution is the negative logarithm to base ten of the hydrogen ion concentration and is a measure of the acidity or alkalinity of the solution.
The pKa is the acid dissociation constant of an acid solution.
In a titration of a strong acid and strong base, the pH at equivalence point is equal to the pKa of the acid.
The equivalence point is the point when equal moles of acids and base has reacted.
In the given titration curve, pH = pKa at point C.
In conclusion, for a titration curve of strong acid and base, at equivalence point, pH is equal to pKa of acid.
Learn more about equivalence point at: brainly.com/question/23502649
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Answer:
For example, elephants form groups with only females and their offspring. Once the male offspring reach a certain age, they leave the group and become solitary. Which is a benefit of this type of social group structure? A:Females do not have to compete for a mate.
An element bonds chemically to fill it's outer valence electron shell, when that occurs it becomes stable.