Answer:
12g KCl will be crystallized
Explanation:
To solve this problem you need to know solubility of KCl in water at 20°C is 34g per 100g of water.
That means the maximum concentration of KCl you can dissolve at 20°C in 200g of water is 34g×2 = 68g of KCl
As solution containing 80g of KCl, the extra KCl will be crystallized after cooling, that is:
80g of KCl - 68g of KCl = <em>12g KCl will be crystallized</em>
I hope it helps!
The molecular formula of water and ammonia is 
and 
respectively.
From the atomic symbol of water it is clear that 1 mole of water contains 2 moles of hydrogen.
So, 
molecules of water contains 
atoms of hydrogen.
From the atomic symbol of ammonia it is clear that 1 mole of ammonia contains 3 moles of hydrogen.
So, 
molecules of ammonia contains 
atoms of hydrogen.
Total number of hydrogen atoms present in the solution = number of hydrogen atoms in water + number of hydrogen atoms in ammonia.
Substituting the values,
Total number of hydrogen atoms present in the solution = 
Total number of hydrogen atoms present in the solution = 
.
Hence, the total number of hydrogen atoms present in the solution is 
atoms.
Protons: 12
Neutrons: 12
<span>Electrons: 12
The atomic number of Magnesium is 12, so it has to have 12 protons. The atomic mass of Magnesium is 24, so it has to have 12 neutrons since 12+12=24 (electrons don't have weight). You can tell it has 12 electrons because the electrons are always the same number as the protons.</span>
Answer:
Gd → Gd⁺ + 1e⁻, Gd⁺ → Gd⁺² + 1e⁻, Gd⁺² → Gd⁺³ + 1e⁻
Explanation:
The ionization energy is the energy necessary to remove one electron of the atom, transforming it in a cation. The first ionization energy is the energy necessary to remove the first electron, the second energy, to remove the second electron, and then successively.
Thus, for gadolinium (Gd)
Fisrt ionization:
Gd → Gd⁺ + 1e⁻
Second ionization:
Gd⁺ → Gd⁺² + 1e⁻
Third ionization:
Gd⁺² → Gd⁺³ + 1e⁻
