Atomic number is same number as the protons...
Neutrons = Mass number - Atomic number ( protons)
Electrons are same number as protons unless the element has a charge..
If it has a charge of +2 it means that the element has 2 less electrons than the neutral atom. If it has a charge of -2 it means that the element has 2 more electrons than what it is supposed to..
The moles of oxygen gas (O2) that is needed is 4 moles
Explanation
2H2 +O2 → 2H2O
The moles of O2 is determined using the mole ratio of H2:O2
that is from equation above H2:O2 is 2:1
If the moles of H2 is 8 moles therefore the moles of O2
= 8 moles x 1/2 = 4 moles
Answer:
selling sand I guess? Some places sell sand for high prices.
Explanation:
Answer: The ratio of conjugate base to weak acid in the buffer system is 758 : 1
Explanation:
The dissociation constant for acid =
pH = 6.34
First we have to calculate the value of
.
The expression used for the calculation of
is,

Now put the value of
in this expression, we get:


Now we have to calculate the ratio of conjugate base to weak acid in the buffer system
Using Henderson Hesselbach equation :
![pH=pK_a+\log \frac{[\text {conjugate base}]}{[Acid]}](https://tex.z-dn.net/?f=pH%3DpK_a%2B%5Clog%20%5Cfrac%7B%5B%5Ctext%20%7Bconjugate%20base%7D%5D%7D%7B%5BAcid%5D%7D)
Now put all the given values in this expression, we get:
![6.34=3.46+\log \frac{[\text {conjugate base}]}{[Acid]}](https://tex.z-dn.net/?f=6.34%3D3.46%2B%5Clog%20%5Cfrac%7B%5B%5Ctext%20%7Bconjugate%20base%7D%5D%7D%7B%5BAcid%5D%7D)
![\frac{[\text {conjugate base}]}{[Acid]}=758](https://tex.z-dn.net/?f=%5Cfrac%7B%5B%5Ctext%20%7Bconjugate%20base%7D%5D%7D%7B%5BAcid%5D%7D%3D758)
Therefore, the ratio of conjugate base to weak acid in the buffer system is 758: 1
Answer:
In 1911, Rutherford showed that Thomson's model was "wrong": the distribution of positive and negative particles was not uniform. Rutherford showed that the atom contains a small, massive, positively charged nucleus. He also agreed with Nagaoka that the electrons move in circular orbits outside the nucleus