The electronic configuration of x, y, and z.
Electronic configuration, also called electronic structure, is the arrangement of electrons in energy levels around an atomic nucleus.
a.
b.
x= Period 1 and group18
Y=Element is in period 3 and Group 2
Z=Element is in period 3 and group 17.
c.
X, Y & Z represents Helium, magnesium, and chlorine.
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1. The molarity of the stock solution of luminol = 1,431 M
2. 0.12 moles of luminol is present in 2.00 L of the diluted spray
3. The volume of the stock solution (Part A) would contain the number of moles present in the diluted solution (Part B): 83.86 ml
<h3>Further explanation</h3>
Stoichiometry in Chemistry studies about chemical reactions mainly emphasizing quantitative, such as the calculation of volume, mass, amount, which is related to the number of ions, molecules, elements, etc.
In stoichiometry included :
is the relative atomic mass of the molecule
1 mole is the number of particles contained in a substance with the same number of atoms in 12 gr C-12
1 mole = 6.02.10²³ particles
While the number of moles can also be obtained by dividing the mass (in grams) by the relative mass of the element or the relative mass of the molecule
Luminol (C₈H₇N₃O₂) is a substance used to detect traces of blood in the scene of a crime because it reacts with iron in the blood
a. a luminol stock solution by adding 19.0g of luminol into a total volume of 75.0mL of H2O.
So the molarity is
- the relative molecular mass of Luminol
= 8. C + 7.H + 3.N + 2.16
= 8.12 + 7.1 + 3.14 + 2.16
= 177 grams / mol
so the mole:
mol = gram / relative molecular mass
mole = 0.1073
2. Molarity (M)
M = mole / volume
M = 1,431
mole = M x volume
mole = 6.10⁻² x 2
mole = 0.12
the number of moles present in the diluted solution (Part B) = 0.12
So the volume of the stock solution (Part A) would contain the number of moles present in the diluted solution (Part B) is:
volume = mol / M
volume = 0.08386 L = 83.86 ml
<h3>Learn more</h3>moles of water you can produce
the number of each atom present in the compound's formula
the ratio of hydrogen atoms (H) to oxygen atoms (O) in 2 l of water
Keywords: mole, volume, molarity, Luminol, the relative molecular mass
Answer:
9.47 mL
Explanation:
The reaction that takes place is:
First we <u>calculate how many KOH moles reacted</u>, using <em>the given concentration and volume of KOH solution</em>:
Then we <u>convert KOH moles into H₂SO₄ moles</u>, using the <em>stoichiometric coefficients</em>:
Finally we <u>calculate the required volume of the H₂SO₄ solution</u>, using<em> the number of moles and given concentration</em>: