Answer:
0.196 M
Explanation:
First, we have to calculate the moles of sodium hydroxide.
moles = mass / molar mass
moles = 3.9280 g / (39.997 g/mol) = 0.098207 mol
It is important to realize that even though 300 mL is the volume of water firstly added to dissolve the hydroxide, the flask is then filled to the mark, meaning that the volume of the solution is 500 mL = 0.500 L.
The molar concentration of sodium hydroxide is:
The concentration is an intensive property, that is, it does not depend on the amount of matter. As a consequence, the concentration of the 50 mL of solution in the buret is the same as the concentration in the flask.
The reaction is second order in AB, so:
![v=k[AB]^2](https://tex.z-dn.net/?f=v%3Dk%5BAB%5D%5E2)
. In the statement, we obtain that
![[AB]=0.104~M](https://tex.z-dn.net/?f=%5BAB%5D%3D0.104~M)
and, at 25 ºC,
. Then:
![v=k[AB]^2\\\\ v=0.0164\cdot0.104^2\\\\ v=0.0164\cdot0.010816\\\\ v\approx0.000177=1.77\times10^{-4}~mol/s](https://tex.z-dn.net/?f=v%3Dk%5BAB%5D%5E2%5C%5C%5C%5C%0Av%3D0.0164%5Ccdot0.104%5E2%5C%5C%5C%5C%0Av%3D0.0164%5Ccdot0.010816%5C%5C%5C%5C%0Av%5Capprox0.000177%3D1.77%5Ctimes10%5E%7B-4%7D~mol%2Fs)
Now, we'll calculate the number of mols of the products in the gas. Using the Ideal Gas Law:
Since each AB molecule forms one of A and one of B,
. Hence:
.
We'll consider that in the beginning there was not A or B. So,
. Furthermore, since the ratio of AB to A and to B is 1:1,
.
Calculating the time by the expression of velocity:
![v=\dfrac{|\Delta[AB]|}{\Delta t}=\dfrac{1}{\Delta t}\cdot\dfrac{|\Delta n_{AB}|}{V}=\dfrac{1}{\Delta t}\cdot\dfrac{|\Delta n_A||}{250~mL}\\\\ 1.77\cdot10^{-4}=\dfrac{1}{\Delta t}\cdot\dfrac{0.0026~mol}{0.25~L}\\\\ \Delta t=\dfrac{0.0026}{0.25\cdot1.77\cdot10^{-4}}\\\\ \boxed{\Delta t\approx58.76~s}](https://tex.z-dn.net/?f=v%3D%5Cdfrac%7B%7C%5CDelta%5BAB%5D%7C%7D%7B%5CDelta%20t%7D%3D%5Cdfrac%7B1%7D%7B%5CDelta%20t%7D%5Ccdot%5Cdfrac%7B%7C%5CDelta%20n_%7BAB%7D%7C%7D%7BV%7D%3D%5Cdfrac%7B1%7D%7B%5CDelta%20t%7D%5Ccdot%5Cdfrac%7B%7C%5CDelta%20n_A%7C%7C%7D%7B250~mL%7D%5C%5C%5C%5C%0A1.77%5Ccdot10%5E%7B-4%7D%3D%5Cdfrac%7B1%7D%7B%5CDelta%20t%7D%5Ccdot%5Cdfrac%7B0.0026~mol%7D%7B0.25~L%7D%5C%5C%5C%5C%0A%5CDelta%20t%3D%5Cdfrac%7B0.0026%7D%7B0.25%5Ccdot1.77%5Ccdot10%5E%7B-4%7D%7D%5C%5C%5C%5C%0A%5Cboxed%7B%5CDelta%20t%5Capprox58.76~s%7D)
Nonmetal Atom is the answer.
Answer:
its the 3rd option.
the molecules move from region of higher concentration to a region of lower concentration.
Explanation:
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