Answer: Since all sodium atoms have 11 protons, this one has 11 protons. This tells us that it also has 11 electrons. Since the mass number is 23, we know that the sum of protons and neutrons in the nucleus must equal 23.
So the answer is : Mass number = 23
Explanation:
Given :
Concentration of hydrogen ions,
.
To Find :
The pH of a solution.
Solution :
We know, pH of a solution is given by :
![pH = - log [ H^+]\\\\pH = -log ( 10^{-3})\\\\pH = 3](https://tex.z-dn.net/?f=pH%20%3D%20-%20log%20%5B%20H%5E%2B%5D%5C%5C%5C%5CpH%20%3D%20-log%20%28%2010%5E%7B-3%7D%29%5C%5C%5C%5CpH%20%3D%203)
Therefore, the pH of the solution is 3 .
Answer:
About 30.17 years
Explanation:
About 94.6% decays by beta emission to a metastable nuclear isomer of barium: barium-137m . The remainder directly populates the ground state of barium-137, which is stable.
Molar mass NH3 = 17.031 g/mol
1 mole NH3 -------------- 17.031 g
?? moles NH3 ---------- 346 g
346 x 1 / 17.031
=> 20.31 moles of NH3
<span>It generally does not mean that there is double the oxygen, but in this case there is double, because the subscript number tells how many atoms of that element are in a particle. In this case, there are two of the oxygen, hence the DI-oxide verbiage, and one of the carbon. When there is only one, it's MONOxide, to indicate only one atom.</span>