Density = 0.70 g/mL
Mass = 80.0 g
Volume = ?
V = m / D
V = 80.0 / 0.70
V = 114.28 mL
hope this helps!
Considering the definition of Kc, the equilibrium molar concentration of HCl at 500 K is 0.0894
.
The balanced reaction is:
H₂(g) +Cl₂(g) ⇆ 2 HCl(g)
Equilibrium is a state of a reactant system in which no changes are observed as time passes, despite the fact that the substances present continue to react with each other. In other words, reactants become products and products become reactants and they do so at the same rate.
In other words, chemical equilibrium is established when there are two opposite reactions that take place simultaneously at the same speed.
The concentration of reactants and products at equilibrium is related by the equilibrium constant Kc. Its value in a chemical reaction depends on the temperature and the expression of a generic reaction aA + bB ⇄ cC is
![K_{c} =\frac{[C]^{c} x[D]^{d} }{[A]^{a} x[B]^{b} }](https://tex.z-dn.net/?f=K_%7Bc%7D%20%3D%5Cfrac%7B%5BC%5D%5E%7Bc%7D%20x%5BD%5D%5E%7Bd%7D%20%7D%7B%5BA%5D%5E%7Ba%7D%20x%5BB%5D%5E%7Bb%7D%20%7D)
That is, the constant Kc is equal to the multiplication of the concentrations of the products raised to their stoichiometric coefficients by the multiplication of the concentrations of the reactants also raised to their stoichiometric coefficients.
In this case, the constant Kc can be expressed as:
![K_{c} =\frac{[HCl]^{2} }{[H_{2} ]x[Cl_{2} ] }](https://tex.z-dn.net/?f=K_%7Bc%7D%20%3D%5Cfrac%7B%5BHCl%5D%5E%7B2%7D%20%7D%7B%5BH_%7B2%7D%20%5Dx%5BCl_%7B2%7D%20%5D%20%7D)
You know that in an equilibrium mixture of HCl, Cl₂, and H₂:
- the concentration of H₂ is 1.0×10⁻¹¹

- the concentration of Cl₂ is 2.0×10⁻¹⁰

- Kc=4×10¹⁸
Replacing in the expression for Kc:
![4x10^{18} =\frac{[HCl]^{2} }{[1x10^{-11} ]x[2x10^{-10} ] }](https://tex.z-dn.net/?f=4x10%5E%7B18%7D%20%20%3D%5Cfrac%7B%5BHCl%5D%5E%7B2%7D%20%7D%7B%5B1x10%5E%7B-11%7D%20%20%5Dx%5B2x10%5E%7B-10%7D%20%5D%20%7D)
Solving:
![4x10^{18} =\frac{[HCl]^{2} }{2x10^{-21} }](https://tex.z-dn.net/?f=4x10%5E%7B18%7D%20%20%3D%5Cfrac%7B%5BHCl%5D%5E%7B2%7D%20%7D%7B2x10%5E%7B-21%7D%20%20%7D)
![4x10^{18} x 2x10^{-21}=[HCl]^{2}](https://tex.z-dn.net/?f=4x10%5E%7B18%7D%20x%202x10%5E%7B-21%7D%3D%5BHCl%5D%5E%7B2%7D)
![8x10^{-3} =[HCl]^{2}](https://tex.z-dn.net/?f=8x10%5E%7B-3%7D%20%3D%5BHCl%5D%5E%7B2%7D)
![\sqrt[2]{8x10^{-3}} =[HCl]](https://tex.z-dn.net/?f=%5Csqrt%5B2%5D%7B8x10%5E%7B-3%7D%7D%20%20%3D%5BHCl%5D)
0.0894
= [HCl]
Finally, the equilibrium molar concentration of HCl at 500 K is 0.0894
.
Learn more:
Taking into account the scientific notation, the result of the subtraction is -4.20689×10⁻².
<h3>Scientific notation</h3>
Scientific notation is a quick way to represent a number using powers of base ten, where the numbers are written as a product:
a×10ⁿ
where:
- a is a real number greater than or equal to 1 and less than 10, to which a decimal point is added after the first digit if it is a non-integer number.
- n is an integer, which is called an exponent or an order of magnitude. Represents the number of times the comma is shifted. It is always an integer, positive if it is shifted to the left, negative if it is shifted to the right.
<h3>Subtraction in scientific notation</h3>
When the numbers to be added do not have the same base 10 exponent, the base 10 power with the highest exponent must be found. In this case, the highest exponent is -2.
Then all the values are expressed as a function of the base 10 exponent with the highest exponent. In this case: 3.11×10⁻⁵= 0.00311×10⁻²
Taking the quantities to the same exponent, all you have to do is subtract what was previously called the number "a". In this case:
0.00311×10⁻² - 4.21×10⁻²= (0.00311 - 4.21)×10⁻²= -4.20689×10⁻²
Finally, the result of the subtraction is -4.20689×10⁻².
Learn more about operations in scientific notation:
brainly.com/question/1894247
brainly.com/question/11403716
brainly.com/question/853571
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<h2>Hardness, lustre, and colour.</h2>
Explanation:
These Rocks shown in photographs are made of different types of minerals which have properties as follows:
●The color of the rock is grey, brown and yellow after it is ground into a powder its color is streak.
● The lustre of the rock tells how shiny the rocks are.
● Other properties include hardness, texture, shape, and size.
Lewis Structure is drawn in following steps,
1) Calculate Number of Valence Electrons: # of Valence electrons in Mg = 2
# of Valence electrons in I = 7
# of Valence electrons in I = 7
---------
Total Valence electrons = 16
2) Draw Mg as a central atom surround it by two atoms of Iodine.3) Connect each Iodine atom to Mg, and subtract two electrons per bond. In this case we will subtract 4 electrons from total valence electrons. i.e.
Total Valence electrons 16
- Four electrons - 4
----------
12
4) Now start adding the remaining 12 electrons on more electronegative atoms i.e. Iodine.
The final lewis structure formed is as follow,