<u>Answer:</u> The for the reaction is -810 kJ.
<u>Explanation:</u>
Hess’s law of constant heat summation states that the amount of heat absorbed or evolved in a given chemical equation remains the same whether the process occurs in one step or several steps.
According to this law, the chemical equation is treated as ordinary algebraic expressions and can be added or subtracted to yield the required equation. This means that the enthalpy change of the overall reaction is equal to the sum of the enthalpy changes of the intermediate reactions.
The given chemical reaction follows:
The intermediate balanced chemical reaction are:
(1)
(2)
The expression for enthalpy of the reaction follows:
Putting values in above equation, we get:
Hence, the for the reaction is -810 kJ.
Answer:
lost
Explanation:
When a television set changes electrical energy to sound and light energy, some of the initial energy is lost in other forms usually heat.
Energy conversion or transformation from one form to another is not an 100% efficient process. This is compliance with the law of thermodynamics.
- The process of transforming energy brings about some loss of energy into the environment.
- No system is 100% efficient in transforming all the energy input into it.
- Some of the energy is usually lost in the process of conversion.
The radius of a sodium atom is determined as 2.145 x 10⁻⁸ cm.
<h3>
What is body-centered cubic unit cell?</h3>
Body-centered cubic (BCC) is the name given to a type of atom arrangement found in nature.
A body-centered cubic unit cell structure consists of atoms arranged in a cube where each corner of the cube shares an atom and with one atom positioned at the center.
<h3>
Volume of the sodium atom</h3>
The volume of the sodium atom is calculated as follows;
V = ZM/Nρ
where;
- Z is 2 for a body-centered cubic unit cell
- M is mass of sodium atom = 23 g/mol
- ρ is density of sodium atom
- N is Avogadro's number
V = (2 x 23) / (6.023 x 10²³ x 0.968)
V = 7.89 x 10⁻²³ cm³
<h3>Edge length of the unit cell</h3>
a = (V)^¹/₃
a = (7.89 x 10⁻²³ cm³)^¹/₃
a = 4.29 x 10⁻⁸ cm
<h3>Radius of the unit cell</h3>
r = a/2
r = ( 4.29 x 10⁻⁸ cm) / 2
r = 2.145 x 10⁻⁸ cm
Thus, the radius of a sodium atom is determined as 2.145 x 10⁻⁸ cm.
Learn more about sodium atom here: brainly.com/question/25033306
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