Answer:
.
.
Explanation:
Hello,
In this case, since the ionization of methylamine is:
![CH_3NH_2(aq)+H_2O(l)\rightleftharpoons CH_3NH_3^+(aq)+OH^-(aq)](https://tex.z-dn.net/?f=CH_3NH_2%28aq%29%2BH_2O%28l%29%5Crightleftharpoons%20CH_3NH_3%5E%2B%28aq%29%2BOH%5E-%28aq%29)
The equilibrium expression is:
![Kb=\frac{[CH_3NH_3^+][OH^-]}{[CH_3NH_2]}](https://tex.z-dn.net/?f=Kb%3D%5Cfrac%7B%5BCH_3NH_3%5E%2B%5D%5BOH%5E-%5D%7D%7B%5BCH_3NH_2%5D%7D)
And in terms of the reaction extent
which is equal to the concentration of OH⁻ as well as that of CH₃NH₃⁺ via ice procedure we can write:
![3.7x10^{-4}=\frac{x*x}{024-x}](https://tex.z-dn.net/?f=3.7x10%5E%7B-4%7D%3D%5Cfrac%7Bx%2Ax%7D%7B024-x%7D)
Whose solution for
via quadratic equation is 9.24x10⁻³ M since the other solution is negative so it is avoided. Therefore, the concentration of OH⁻ is:
![[OH^-]=x=9.24x10^{-3}M](https://tex.z-dn.net/?f=%5BOH%5E-%5D%3Dx%3D9.24x10%5E%7B-3%7DM)
With which we can compute the pOH at first:
![pOH=-log([OH^-])=-log(9.24x10^{-3})=2.034](https://tex.z-dn.net/?f=pOH%3D-log%28%5BOH%5E-%5D%29%3D-log%289.24x10%5E%7B-3%7D%29%3D2.034)
Then, since pH and pOH are related via:
![pH+pOH=14](https://tex.z-dn.net/?f=pH%2BpOH%3D14)
The pH turns out:
![pH=14-pOH=14-2.034\\\\pH=11.97](https://tex.z-dn.net/?f=pH%3D14-pOH%3D14-2.034%5C%5C%5C%5CpH%3D11.97)
Best regards.
<span>Electron's further from the nucleus are held more weakly by the nucleus, and thus can be removed by spending less energy. Hence we say they have higher energy.</span>
Not sure if this is what you mean but l= A/w
(length equals area divided by width)
The correct answer is option B, that is, an element.
A compound comprises of either more than one kind of atom or various similar atoms. They can be dissociated or can be converted into a simpler one. An element refers to a substance that comprises only one kind of atom. It cannot be dissociated further or can be converted into simpler substance by any chemical means.
Heterogeneous mixture refers to a non-uniform mixture of distinct atoms without any chemical bonding in between them. On the other hand, homogenous mixture refers to a uniform mixture of distinct atoms with the absence of any kind of chemical bonding in between them.