Complete Question
Consider the rechargeable battery: [tex]Zn(s)||ZnCl _{(aq)}||Cl_2_{(aq)}|Cl_2 (l)|C_{(s)}[/tex]
(a) Write reduction half-reactions for each electrode. From which electrode will electrons flow from the battery into a circuit if the electrode potentials are not too different from [tex]E^o[/tex] values
(b)
if the battery delivers a constant current of [tex]1 .00 *10^{3} \ A[/tex] for 1.00 h , how many kg of [tex]Cl_2[/tex] will be consumed
Answer:
a
At the anode
[tex]Zn^{2+} + 2e^{-} \to Zn_{s} \ \ \ E^o = -0.762 V[/tex]
At the cathode
[tex]Cl_2 _{(l)} + 2e^{-} \to 2Cl^{-} _{aq} \ \ \ \ E^o = 1.396 V[/tex]
b
The value is [tex]mCl = 1.32583 \ kg [/tex]
Explanation:
Generally the half-reactions for each electrode is mathematically represented as
At the anode
[tex]Zn^{2+} + 2e^{-} \to Zn_{s} \ \ \ E^o = -0.762 V[/tex]
At the cathode
[tex]Cl_2 _{(l)} + 2e^{-} \to 2Cl^{-} _{aq} \ \ \ \ E^o = 1.396 V[/tex]
Generally from the question we are told that
The current is [tex]I = 1.00 *10^{3} \ A[/tex]
The time is [tex]t = 1.00\ h= 3600[/tex]
Generally the quantity of charge consumed is
[tex]Q = It[/tex]
=> [tex]Q = 1.00 *10^{3} * 3600 [/tex]
=> [tex]Q = 3.6 *10^{6} \ C [/tex]
Generally the number of moles of electron consumed is
[tex]n = \frac{Q}{F}[/tex]
Here F is the faradays constant with value [tex]F = (96500C/mole \ e-)[/tex]
So
[tex]n = \frac{ 3.6 *10^{6} }{96500}[/tex]
=> [tex]n = 37.3 \ moles [/tex]
Generally the number of moles of [tex]Cl_2[/tex] consumed is mathematically represented as
[tex]nCl = \frac{1}{2} * n[/tex]
=> [tex]nCl = \frac{1}{2} * 37.3 [/tex]
=> [tex]nCl = 18.7 \ moles [/tex]
Generally the mass of [tex]Cl_2[/tex] consumed is mathematically represented as
[tex]mCl = nCl * Z[/tex]
Here Z is the molar mass of [tex]Cl_2[/tex] is Z = 70.9 g/mole
So
[tex]mCl = 18.7 * 70.9 [/tex]
=> [tex]mCl = 18.7 * 70.9 [/tex]
=> [tex]mCl = 1325.83 \ g [/tex]
=> [tex]mCl = 1.32583 \ kg [/tex]
Please help will give brainliest _________________________________________________________________________________________________________________________________________
Answer:
What subject is this for?
Explanation:
Which of the following best describes the structure of a nucleic acid?
a
Carbon ring(s)
b
Globular or fibrous
c
Single or double helix
d
Hydrocarbon(s)
The # of electrons in S2- -34 is
Answer:
The answer is 16
Explanation:
which material should you use so that the area is cool in terms of temperture O asphalt O red bricks O concrete O soil O
Answer:
red bricks
Explanation:
right on edg 2020
Red bricks should you use so that the area is cool in terms of temperture. Therefore, option B is correct.
What are red bricks used for?Red bricks can be used in the construction of structures such as buildings, foundations, arches, pavement, and bridges. These can also be used for aesthetic purposes such as landscaping, face work, and a variety of other architectural purposes.
Traditional red bricks are saw to be more robust, and structures constructed with them are stronger than hollow block structures.Red brick can be warm, with rust or terracotta undertones. They could also be cool and more burgundy.
Thus, Red bricks should you use so that the area is cool in terms of temperture, option B is correct.
To learn more about the red bricks, follow the link;
https://brainly.com/question/14893671
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pencil has a density of 14.5 g/mL and a volume of 5 mL. Calculate the mass in grams.
Answer:
The answer is 72.5 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question we have
mass = 14.5 × 5
We have the final answer as
72.5 gHope this helps you
In this reaction: Mg (s) + I₂ (s) → MgI₂ (s)
If 3.34 moles of Mg react with 3.56 moles of I₂, and 1.76 moles of MgI₂ form, what is the percent yield?
Answer:
52.7%
Explanation:
The balanced equation for the reaction is given below:
Mg (s) + I₂ (s) → MgI₂ (s)
From the balanced equation above,
1 mole of Mg reacted with 1 mole of I₂ to produce 1 mole of MgI₂.
Next, we shall determine the limiting reactant. This can be obtained as follow:
From the balanced equation above,
1 mole of Mg reacted with 1 mole of I₂.
Therefore, 3.34 moles of Mg will also react with 3.34 moles of I₂.
From the illustration made above, we can see that only 3.34 moles out of 3.56 moles of I₂ reacted completely with 3.34 moles of Mg.
Therefore, Mg is the limiting reactant and I₂ is the excess reactant.
Next, we shall determine the theoretical yield of MgI₂.
In this case, the limiting reactant will be use because it will produce the maximum yield of MgI₂ as all of it is consumed in the reaction.
The limiting reactant is Mg and the theoretical yield of MgI₂ can be obtained as follow:
From the balanced equation above,
1 mole of Mg reacted to produce 1 mole of MgI₂.
Therefore, 3.34 moles of Mg will also react to produce 3.34 moles of MgI₂.
Thus, the theoretical yield of MgI₂ is 3.34 moles.
Finally, we shall determine the percentage yield of MgI₂ as follow:
Actual yield of MgI₂ = 1.76 moles
Theoretical yield of MgI₂ = 3.34 moles.
Percentage yield of MgI₂ =.?
Percentage yield = Actual yield /Theoretical yield × 100
Percentage yield = 1.76/3.34 × 100
Percentage yield of MgI₂ = 52.7%
which of the following is an acidic oxide?
A.CO
B.N2O
C.SO2
D.K2O
Answer:
C
Explanation:
I Need Help Please ?
Answer:
Not sure dude goodluck
Explanation:
In the ionic compound KCL, which ion is the cation, and which is the anion? PLEASE HELP
Answer:
Potassium chloride, KCl , is an ionic compound formed by the electrostatic force of attraction that holds the potassium cations and the chlorine anions together
Explanation:
What do scientists call all of the compounds that contain carbon and are found in living things?
organic
inorganic
acidic
nonacidic
Answer:
Organic
Explanation:
Edge student
3. Which of the following molecules would want except to have a nonpolar covalent bond
Answer:
polar bonds are caused by different kind of atoms, because almost every atoms have different powers to attract electrons.
the answer will be the two same atoms, F2
While ethanol CH3CH2OH is produced naturally by fermentation, e.g. in beer- and wine-making, industrially it is synthesized by reacting ethylene CH2CH2 with water vapor at elevated temperatures. A chemical engineer studying this reaction fills a 100L tank with 33.mol of ethylene gas and 16.mol of water vapor. When the mixture has come to equilibrium he determines that it contains 26.8mol of ethylene gas and 9.8mol of water vapor. The engineer then adds another 8.0mol of water, and allows the mixture to come to equilibrium again. Calculate the moles of ethanol after equilibrium is reached the second time. Round your answer to 2 significant digits.
Answer:
The value is [tex]k = 7.111 \ moles [/tex]
Explanation:
Generally the reaction between ethylene and water vapor is
[tex]CH_2CH_2_{(g)} \ \ \ +\ \ \ \ H_2O\ \ \ \rightarrow\ \ \ \ C_2H_5OH_{(g)}[/tex]
From the question the initial number of moles of ethylene is 33.mol
the initial number of moles of water vapor is 16.mol
So
At initial
[tex]CH_2CH_2_{(g)} \ \ \ +\ \ \ \ H_2O\ \ \ \rightarrow\ \ \ \ C_2H_5OH_{(g)}[/tex]
33.mol 16.mol 0 mols
Now at first equilibrium the number of moles of ethylene is 26.8mol
the number of moles of water vapor is 9.8mol
So the number of moles of ethanol is 33-26.8 = 6.2 mol
So at equilibrium
[tex]CH_2CH_2_{(g)} \ \ \ +\ \ \ \ H_2O\ \ \ \rightarrow\ \ \ \ C_2H_5OH_{(g)}[/tex]
26.8mol 9.8mol 6.2 mol
Generally the equilibrium constant is mathematically represented as
[tex]K = \frac{[C_2H_5OH]}{[CH_2CH_2] [H_2O]}[/tex]
Here [tex][C_2H_5OH][/tex] is the concentration of ethanol which is mathematically represented as
[tex][C_2H_5OH] = \frac{6.2 \ mol}{100L}[/tex]
=> [tex][C_2H_5OH] = 0.062 mol/L [/tex]
Also
[tex] [CH_2CH_2] = \frac{26.8 \ mol}{100L}[/tex]
[tex] [CH_2CH_2] = 0.268 mol/L[/tex]
Also
[tex][H_2O] = \frac{ 9.8 \ mol}{100L}[/tex]
[tex] [H_2O] = 0.098 mol/L[/tex]
So
[tex]K = \frac{0.062}{0.268* 0.098 }[/tex]
[tex]K = 2.3606 [/tex]
From the question we are told that 8 moles was added to ethylene
So volume of ethylene becomes 26.8 + 8 = 34.8 moles
So after the addition
[tex]CH_2CH_2_{(g)} \ \ \ +\ \ \ \ H_2O\ \ \ \rightarrow\ \ \ \ C_2H_5OH_{(g)}[/tex]
34.8mol 9.8mol 6.2 mol
At the second equilibrium
[tex]CH_2CH_2_{(g)} \ \ \ +\ \ \ \ H_2O\ \ \ \rightarrow\ \ \ \ C_2H_5OH_{(g)}[/tex]
(34.8- z)mol (9.8-z)mol ( 6.2+z) mol
Generally the equilibrium constant is mathematically represented as
[tex]K = \frac{[C_2H_5OH]}{[CH_2CH_2] [H_2O]}[/tex]
Here
[tex][C_2H_5OH][/tex] is now equal to
[tex][C_2H_5OH] = \frac{6.2+z}{100}[/tex]
[tex][CH_2CH_2]= \frac{ 34.8- z }{100}[/tex]
[tex][CH_2CH_2]= \frac{ 9.8-z }{100}[/tex]
So m
[tex]2.3606 = \frac{ \frac{6.2+z}{100}}{[ \frac{34.8- z }{100}] [\frac{ 9.8-z }{100}]}[/tex]
[tex]2.3606 = \frac{ \frac{6.2+z}{100}}{\frac{ z^2 -44.6 z + 341.04}{10000} }[/tex]
=> [tex]2.3606 = \frac{ 620 - 100z}{z^2 -44.6 z + 341.04}[/tex]
=> [tex]2.3606z^2 - 105.283 z + 805.05 =620 - 100z[/tex]
=> [tex]2.3606z^2 - 205.283 z + 185.059 = 0[/tex]
Multiply through by minus
=> [tex]2.3606z^2 -108.498z + 3336.7 = 0[/tex]
Solving this using quadratic equation
So [tex]z = 0.911[/tex]
Hence the number of moles of ethanol present at the second equilibrium is
[tex]k = 0.911 +6.2 [/tex]
[tex]k = 7.111 \ moles [/tex]
In the presence of strong acids, which of the oxygen atoms on the carboxyl group is preferentially protonated and why?
a. Protonation occurs at the carbonyl oxygen because the resulting conjugate acid i stabilized by resonance.
b. Protonation occurs at the carbonyl oxygen because the resulting conjugate base is stabilized by the inductive effect.
c. Protonation occurs at the hydroxyl oxygen because the resulting conjugate acid is stabilized by resonance.
d. Protonation occurs at the hydroxyl oxygen because the resulting conjugate base is stabilized by the inductive effect.
Answer:
Protonation occurs at the carbonyl oxygen because the resulting conjugate acid is stabilized by resonance.
Explanation:
The carboxyl group is an organic and a functional group that consists of a carbon atom that's singly bonded to a hydroxyl group and double-bonded to an oxygen atom.
In the presence of strong acids, protonation occurs at the carbonyl oxygen because the resulting conjugate acid is stabilized by resonance.
HELPPP!!!
Write a definition for fluid that incorporates time
into a model of solids and liquids.
Answer:
Definition: Fluid that can act as a liquid or as a solid depending on the pressure applied on it.
Explanation:
A fluid that incorporates time in a solid and liquid model is a non-Newtonian fluid. This type of fluid can behave as a solid or as a liquid depending on the pressure that is applied on it. This is different from normal fluids that remain the same regardless of the pressure they are subjected to. In the case of non-Newtonian fluids, when submitted to pressure, they are presented as solids, but without pressure, they are presented as liquids. This feature can be seen even within the same system.
On the graph, indicate the distance that corresponds to the bond length of the N2 molecule by placing an X on the horizontal axis.
Answer:
Check the image in the file attached below.
Explanation:
The objective of this question is to use the diagram provided to indicate the distance that corresponds to the bond length of the N2 molecule by placing X on the horizontal axis.
The bond length shows the distance of the bonds between the nuclei of the bonded atoms between the N2 molecule and O2 molecule. From the diagram, we can see that the bond length of O2 shows a greater tendency over the N2 molecule and it also have higher potential energy than the N2 molecule.
The distance corresponding to the bond length of N₂ is indicated in the attached graph.
Bond length represents/shows the bond distance between the atoms that are chemically bonded in the molecule ( N₂ ) . The bond distance ( average distance ) is measured from the nucleus of one binding atom toward another.
The bond length determines how easy or difficulty atoms bonded in a molecule can be separated. i.e. the longer the bond length the easier it is to separate chemically bonded atoms in a molecule.
Hence we can conclude that the distance corresponding to the bond length of N₂ is indicated in the attached graph.
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Help plz!!!!!!!!!!!!!!!
Answer:
Albert Einstein proposed that a beam of light is not a wave propagating through space, but a collection of discrete wave packets—photons.
Explanation:
So the right answer is the first one.
Which property do solutions with high pH values have?
gives off hydrogen gas when reacted with metal
turns litmus paper red
tastes sour
feels slippery
Answer:
I would say turns litmus paper red.
Explanation:
I finished the quiz, and got it right! Hope this helps!
Jeremy left his bike outside overnight. When he woke up in the morning, there were water drops on the seat. When he went to ride his bike after lunch, he saw the water drops had disappeared. Which statement best describes what happened to the water? (2 points) a The energy from the sun caused the water drops to condense. b The energy from the sun caused the water on the seat to boil. c The energy from the sun cooled the water, causing it to evaporate. d The energy from the sun heated the water, causing it to evaporate.
Answer:
d The energy from the sun heated the water, causing it to evaporate.
Explanation:
The correct description of what happened is that the energy from the sun heated the water and causes it to evaporate completely.
Evaporation is a phase change process in which liquid is converted to gases. This occurs when a liquid gains considerable amount of energy. The molecules then breaks free from the bond holding compound place.
Option A is wrong because the energy from the sun does not cause condensation i.e. change from gas to liquid. The water on the seat does not boil, it simply evaporates. So, option B is wrong. When heat energy is added, it does not cause cooling of water. So option C is wrong.Which of the following did you include?
The atoms in each ion are bonded together covalently to form a single unit.
The charge is distributed over the entire ion.
The formula of ammonium fluoride is NH4F.
The formula of potassium sulfate is K2SO
Answer:
The formula of ammonium fluoride is NH4F.
Explanation:
1 The atoms in each ion are bonded together covalently to form a single unit.
Wrong!
⇒ The atoms in an ion compound are linked together by an ionic bond.
2 The charge is distributed over the entire ion.
Wrong!
Ions have taken in or given up electrons. This happens in the atomic shell.
3 The formula of ammonium fluoride is NH4F.
Right!
4 The formula of potassium sulfate is K2SO
Wrong!
The formula for potassium sulfate is K2SO4.
What is the standard enthalpy of the reaction:
2 NO(g) + O2(g) → 2 NO2(g)?
Answer:
-116.2 kJ
Explanation:
Suppose a student needs to standardize a sodium thiosulfate, Na2S2O3,Na2S2O3, solution for a titration experiment. To do so, he or she will react it with a solution of iodine. The student adds a 1.00 mL1.00 mL aliquot of 0.0200 M KIO30.0200 M KIO3 solution to a flask, followed by 3 mL3 mL of distilled water, 0.2 g0.2 g of solid KI,KI, and 1 mL H2SO4.1 mL H2SO4. The student then titrates the solution with sodium thiosulfate solution in order to determine the exact concentration of Na2S2O3.Na2S2O3. The end point of the titration is reached after 0.90 mL0.90 mL of Na2S2O3Na2S2O3 is dispensed from a microburet. What is the concentration of the standard sodium thiosulfate solution?
Answer:
0.133
Explanation:
reaction between KIO3 and KI in acidic medium
IO3⁻ +5I⁻ +6h⁺ → 3I₂ + 3H₂O
I₂ reacts with thiosulphate
NaS₂O₃ → 2Na⁺ + S₂O₃²⁻
net reaction
IO⁻₃ + 6H⁺ + 6S₂O₃³⁻ → I⁻ + 3S₄O₆²⁻ + 3H₂O
mole of KIO₃
= molarity x volume
[tex]\frac{0.02mol}{L} *0.01L[/tex]
= 0.00002mol
a mole of KIO₃ has reaction with 6 mol of S₂O₃²⁻
= 2x6x10⁻⁵
= 0.00012 mol
volume = 0.90 ml
1 ml = 0.001L
0.90ML = 0.0009L
to get concentration,
molarity/volume
= 0.00012/0.0009
= 0.133m
The concentration of the standard sodium thiosulfate solution is ; 0.133
The net chemical reaction equation
IO₃⁻ + 6H⁺ + 6S₂O₃³⁻ ----> I⁻ + 3S₄O₆²⁻ + 3H₂O
First step : Determine the moles of KIO₃
number of moles = molarity * volume
= 0.02 mol / L * 0.01 L
= 0.00002 mol
From the net chemical reaction equation
one ( 1 ) mole of KIO₃ reacts with 6 moles of S₂O₃²⁻
∴ number of moles in the reaction = 6 * 0.00002 = 0.00012 mol.
Final step : Determine the concentration of sodium thiosulfate solution
Given Volume = 0.90 ml = 0.0009 L
∴ concentration of sodium thiosulfate solution
= 0.00012 / 0.0009 = 0.133
Hence we can conclude that The concentration of the standard sodium thiosulfate solution is ; 0.133
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Calculate the pH of a 0.02 M solution of ascorbic acid ( K a1 = 7.9 × 10 –5; K a2 is 1.6 × 10 –12).
a.
2.9
b.
8.2
c.
11.8
d.
11.1
e.
5.8
Answer:
C
Explanation:
On the graph, which shows the potential energy curve of two N atoms, carefully sketch a curve that corresponds to the potential energy of two O atoms versus the distance between their nuclei.
Answer:
Explanation:
We are to carefully sketch a curve that relates to the potential energy of two O atoms versus the distance between their nuclei.
From the diagram, O2 have higher potential energy than the N2 molecule. Because on the periodic table, the atomic size increases from left to right on across the period, thus O2 posses a larger atomic size than N2 atom.
Therefore, the bond length formation between the two O atoms will be larger compared to that of the two N atoms.
Why do the leaves outside change colors?
Answer:
because the amount of pigments change as thee leaves prepare to fall from the trees
The mercury level in a capillary tube placed in a dish of mercury is actually below the surface of the mercury in the dish. Please choose the answer that best explains the phenomenon.a. Mercury flows freely and is incapable of clinging to the walls of the capillary tube. b. Mercury has an incredibly high density for a liquid, making it too heavy to climb the capillary tube, c. The cohesive forces of mercury are much stronger than its adhesive forces. The adhesive forces may be repulsive, causing the mercury level in the tube to be lower than the mercury in the dish. d. Mercury is a polar molecule. It creates incredibly high cohesive forces, which prevent the mercury from climbing the capillary tube.
Answer:
The cohesive forces of mercury are much stronger than its adhesive forces.
Explanation:
Cohesive forces are forces that exist between the particles that compose a substance while adhesive forces refer to forces that exist between the particles of a substance and those of another substance.
The cohesive forces in mercury far outweigh the adhesive forces between the mercury drops and glass. Hence when mercury is put into a capillary tube, its meniscus is convex because cohesive forces tend to draw the liquid mercury into a drop.
Hence, the surface tension in mercury makes the mercury in the capillary tube to fall below the height of the mercury in the dish.
QUICKKKKK ill do 200+ points next question, how would you produce 1L of a .5 M KF solution, from a stock solution of 1 M KF
Answer:
We will take the 0.5 L from the 1M stock solution of KF inorder to form 0.5 M KF of 1L.
Explanation:
Given data:
Final volume = 1L
Final molarity = 0.5 M
Initial molarity = 1 M
Initial volume = ?
Solution:
Formula:
M₁V₁ = M₂V₂
1 M × V₁ = 0.5 M ×1L
V₁ = 0.5 M ×1L /1 M
V₁ = 0.5 L
We will take the 0.5 L from the 1M stock solution of KF inorder to form 0.5 M KF of 1L.
Object A has a mass of 12g and a volume of 8cm3. object B has a mass of 20g and a volume of 8cm3 . which object has a greater density and by how much
Answer:
Object B has a density of 2.5 g/cm³ which is greater than object A by 1 g/cm³
Explanation:
Since we know that the formula for density is d=m/v, we can divide each mass by its corresponding volume to find the densities
12/8=1.5
20/8=2.5
So we know that object B has a greater density than object A by 1 g/cm³ (gram per cubic centimeter). Also the standard unit for density is kilograms per cubic meter but I used gram per cubic centimeter since they were the given units. 1cm=100m, 1000g=1km
Now
Selec
BI
Toda
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How and why do ionic bonds form? Check all of the boxes that apply
lonic bonds form between metal atoms and other metal atoms.
Ionic bonds form between metal atoms and nonmetal atoms
The more electronegative atoms transfer one or more electrons to the less electronegative atom
The less electronegative atoms transfers one or more electrons to the more electronegative atom,
The metal atom forms a cation and the nonmetal atom forms an anion
The attraction between ions with the same charge forms an ionic bond,
The attraction between ions with an opposite charge forms an ionic bond.
BLO
I lo
DONE
Elo
Yous
Answer:
✔️Ionic bonds form between metal atoms and nonmetal atoms.
✔️The less electronegative atoms transfers one or more electrons to the more electronegative atom
✔️The metal atom forms a cation and the nonmetal atom forms an anion.
✔️The attraction between ions with an opposite charge forms an ionic bond.
Explanation:
Ionic bond refers to the bond formation which occurs when there is complete and permanent transfer of electrons from one metal atom to another non-metal atom. The metals, which are electropositive (less electronegative) loose their electrons while the non-metals, which are less electropositive (more electronegative) gain the electrons.
When the metal atom looses electrons, they form cations(become positively charged) while non-metal atom forms anions (become negatively charged). When the opposite charges attract each other, they form ionic bond.
Answer:
✔️ Ionic bonds form between metal atoms and nonmetal atoms.
✔️ The less electronegative atoms transfers one or more electrons to the more electronegative atom.
✔️ The metal atom forms a cation and the nonmetal atom forms an anion.
✔️ The attraction between ions with an opposite charge forms an ionic bond.
Carbonic acid, H2CO3, has two acidic hydrogens. A solution containing an unknown concentration of carbonic acid is titrated with potassium hydroxide. It requires 22.9 mL of 1.430 M KOH solution to titrate both acidic protons in 54.2 mL of the carbonic acid solution.
Required:
a. Write a balanced net ionic equation for the neutralization reaction. Include physical states.
b. Calculate the molarity of the carbonic acid solution.
Answer:
a. H₂CO₃(aq) + KOH(aq) ⇄ K₂CO₃(aq) + H₂O(l)
b. 0.603 M
Explanation:
Step 1: Write the neutralization reaction
H₂CO₃(aq) + KOH(aq) ⇄ K₂CO₃(aq) + H₂O(l)
Step 2: Calculate the reacting moles of KOH
22.9 mL of 1.430 M KOH react.
0.0229 L × (1.430 mol/L) = 0.0327 mol
Step 3: Calculate the reacting moles of H₂CO₃
The molar ratio of H₂CO₃ to KOH is 1:1. The reacting moles of H₂CO₃ are 1/1 × 0.0327 mol = 0.0327 mol.
Step 4: Calculate the molarity of H₂CO₃
0.0327 moles of H₂CO₃ are in a volume of 54.2 mL. The molarity of H₂CO₃ is:
M = 0.0327 mol/0.0542 L = 0.603 M
plz help. with both will mark brainest
Answer:
The first one is balanced, but the second one is unbalanced.
Explanation:
Second one is unbalanced because there is an additional H and Cl on the right side. To fix it you would add a two in front of the HCl on the left side.
