An isotope with 8 protons, 9 neutrons, and 8 electrons would have which symbol? A) 16F
2 answers:
Answer: D.
Explanation: Atomic number is the number of protons or the number of electrons.
Mass number is the sum of number of protons and number of neutrons.
Atomic number = number of electrons= number of protons = 8
Mass number = number of protons + number of neutrons= 8+9= 17
The representation of element is :
where Z= atomic number, A= mass number , X= chemical symbol of element
The representation of the element with atomic number 8 and mass number 17 is : .
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Hello!
First, we need to determine the pKa of the base. It can be found applying the following equation:
Now, we can apply the Henderson-Hasselbach's equation in the following way:
![pH=pKa+log( \frac{[CH_3NH_2]}{[CH_3NH_3Cl]} )=10,65+log( \frac{0,18M}{0,73M} )=10,04](https://tex.z-dn.net/?f=pH%3DpKa%2Blog%28%20%5Cfrac%7B%5BCH_3NH_2%5D%7D%7B%5BCH_3NH_3Cl%5D%7D%20%29%3D10%2C65%2Blog%28%20%5Cfrac%7B0%2C18M%7D%7B0%2C73M%7D%20%29%3D10%2C04)
So, the pH of this buffer solution is 10,04
Have a nice day!
First, we need to determine the pKa of the base. It can be found applying the following equation:
Now, we can apply the Henderson-Hasselbach's equation in the following way:
So, the pH of this buffer solution is 10,04
Have a nice day!