Answer:
It will take 77.8 seconds for 95% of sample to react
Explanation:
As the given reaction obeys 1st order therefore-
![[N_{2}O_{5}]=[N_{2}O_{5}]_{0}\times (\frac{1}{2})^{\frac{t}{t_{\frac{1}{2}}}}](https://tex.z-dn.net/?f=%5BN_%7B2%7DO_%7B5%7D%5D%3D%5BN_%7B2%7DO_%7B5%7D%5D_%7B0%7D%5Ctimes%20%28%5Cfrac%7B1%7D%7B2%7D%29%5E%7B%5Cfrac%7Bt%7D%7Bt_%7B%5Cfrac%7B1%7D%7B2%7D%7D%7D%7D)
Where ![[N_{2}O_{5}]](https://tex.z-dn.net/?f=%5BN_%7B2%7DO_%7B5%7D%5D)
is the concentration of 
after "t" time, ![[N_{2}O_{5}]_{0}](https://tex.z-dn.net/?f=%5BN_%7B2%7DO_%7B5%7D%5D_%7B0%7D)
is the initial concentration of and 
is half life
Here, ![\frac{[N_{2}O_{5}]}{[N_{2}O_{5}]_{0}}=\frac{100-95}{100}=0.05](https://tex.z-dn.net/?f=%5Cfrac%7B%5BN_%7B2%7DO_%7B5%7D%5D%7D%7B%5BN_%7B2%7DO_%7B5%7D%5D_%7B0%7D%7D%3D%5Cfrac%7B100-95%7D%7B100%7D%3D0.05)
and 
So, 
or, 
So, it will take 77.8 seconds for 95% of sample to react
Answer: give me more of an explaination
Explanation:
Answer:
It is called Potassium Hydroxide
Answer:
e. When the indicator changes color and remains, 2 more drops of the solution in the buret should be added.
Explanation:
<em>Which statement is incorrect?
</em>
<em>Select one:
</em>
<em>
a. The volume of solution in the buret should be recorded when the endpoint is reached.
</em> CORRECT. At the endpoint, the titrant is expected to have completely reacted with the titrand.
<em>b. It is good practice to place the flask over a white background to better observe the color change of the solution.</em> CORRECT. Using a white background makes it easier to detect the changes in the color of the indicator.
<em>c. The endpoint is when the indicator changes color.</em>
CORRECT. This is the function of an indicator.
<em>d. Phenolphthalein will go from a colorless solution to a pink solution for the addition of NaOH to an acid solution.</em> CORRECT. Phenolphthalein is colorless when pH < 8.3 and it is pink when pH > 10.0.
<em>e. When the indicator changes color and remains, 2 more drops of the solution in the buret should be added.</em> INCORRECT. When the endpoint is reached, no more titrant should be added.
