Consider the following half reactions and their standard reduction potential values to answer the following questions.
Cu2+ (aq) + e- Cu+ (aq)E° = 0.15 V
Br2 (l) + 2e- 2Br- (aq) E° = 1.08 V
i) State which reaction occurs at the anode and which at the cathode. [2 marks]
ii) Write the overall cell reaction. [2 marks]
iii) Calculate the value of E°cell. [2 marks]
iv) Calculate the value ΔG° [2 marks]
v) What is the value of Kc at 25°C?
Answers
Answer:
Cu2+ (aq) + e- -------->Cu+ (aq)E° = 0.15 V anode
Br2 (l) + 2e- -------------> 2Br- (aq) E° = 1.08 V cathode
Explanation:
The half equation having a more positive reduction potential indicates the reduction half equation while the half equation having the less positive reduction potential indicates the oxidation half equation.
The overall redox reaction equation is;
2Cu^+(aq) + Br2(g) ----> 2Cu^2+(aq) + 2Br^-(aq)
E°cell= E°cathode -E°anode
E°cathode= 1.08 V
E°anode= 0.15 V
E°cell= 1.08V-0.15V
E°cell= 0.93V
From;
∆G=-nFE°cell
n= 2
F=96500C
E°cell= 0.93V
∆G= -(2×96500×0.93)
∆G= - 179.49 J
From ∆G= -RTlnK
∆G= - 179.49 J
R=8.314Jmol-K-1
T= 25° +273= 298K
K= ???
lnK= ∆G/-RT
lnK=-( - 179.49/(8.314×298))
lnK= 0.0724
K= e^0.0724
Kc= 1.075
Related Questions
Name five renewable energy resources.
Answers
Hydro power
Solar power
Biomass
Hydroelectricity
Answer:
Solar energy, geothermal energy. Wind energy. Hydropower, Biomass.
Explanation:
If a,b,c are in AP & x, y, z are in GP, prove that: x^(b-c).y^(c-a).z^(a- b) = 1
I will report if wrong.
Answers
Answer:
b
Explanation:
Atoms of which two elements will form an ionic bond?
a. N and O
b. Mg and Cl
c. Fe and Co
d. Rb and Al
Answers
Mg and Cl
Explanation:
The magnesium would lose two electrons, becoming +2 charged and two chlorines (not one) would each gain one electron, each becoming -1 charged in the process.
The three ions would adhere (bond) to each other by the positive/negative attraction between the ions.
write a balanced chemical equation for the decomposition of asprin
Answers
The balanced chemical equation for the decomposition of aspirin (acetylsalicylic acid) is:
\(2C_{9}H_{8}O_{4} (aspirin) → 2C_{7}H_{6}O_{3} (salicylic acid) + 2CO_{2} (Carbon dioxide) + H_{2}O (water)\)
In this reaction, the aspirin molecule breaks down into salicylic acid, carbon dioxide, and water. The reaction is typically catalyzed by heat or exposure to acidic or basic conditions.
Aspirin, or acetylsalicylic acid, contains ester functional groups that can undergo hydrolysis. Under suitable conditions, the ester bond in aspirin is cleaved, leading to the formation of salicylic acid, which is the primary decomposition product. Additionally, carbon dioxide and water are released as byproducts of the reaction.
The balanced equation shows that for every two molecules of aspirin, two molecules of salicylic acid, two molecules of carbon dioxide, and one molecule of water are formed. Understanding the decomposition of aspirin is important in pharmaceutical and chemical industries to ensure the stability and shelf-life of the compound, as well as to study its breakdown products and potential side reactions.
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What is smaller?
Decameter or a meter?
Answers
Answer:
Decameter
Explanation:
Decameter is 1/10 of a meter.
Which substance has ionic bonds BaO?
Answers
BaO has ionic bonds because of electronegative difference.
Ionic bonds, also known as electrovalent bonds, are a type of linkage created in a chemical compound by the electrostatic attraction of ions with opposing charges. When the valence (outermost) electrons of one atom are permanently transferred to another atom, a bond of this kind is created. If an atom gains electrons, it becomes a negatively charged ion (cation), while if it loses them, it becomes a positively charged ion (cation) (anion). Following is a brief discussion of ionic bonds. To learn more, go to chemical bonding: the ionic bonding process.
Ionic or electrovalent compounds are produced by ionic bonding, and the compounds formed between nonmetals and alkali and alkaline-earth metals serve as the best examples of this type of compound. Actually, a polar covalent bond is the extreme form of an ionic bond.
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My swimming pool is rectangular (16 feet by 34 feet) and has a depth of 6 feet. Lets imagine that my pool water is full to the top and is heated by a laser that emits photons with a wavelength of 520 nm. The starting temperature of my pool is a chilly 52 degrees Celsius. How many moles of photons would be required to heat the pool to a balmy 80 degrees Celsius
Answers
Answer:
Number of moles of photons required = 5.04 × 10⁴ moles
Explanation:
The energy of a photon can be calculated from Planck's equation E = hc/λ
Where h = 6.63 × 10-³⁴ Js and c, the velocity of light = 3.0 × 10⁸ m/s
Energy of one mole of photons = N₀ × hc/λ
wavelength of photon, λ = 520 nm = 5.20 × 10-⁷ m
Energy of one mole of photons = 6.02 × 10²³ × 6.63 × 10−³⁴ × 3 × 10⁸/5.20 × 10-⁷
Energy of one mole of photons = 2.30 × 10⁵ J/mol
Energy required to raise the temperature of a given mass of a substance, E = mcΔT
Where m is mass of substance, c is specific heat capacity, ΔT is temperature difference
Mass ofnwternin the pool = volume × density
Volume of water = Volume of swimming pool
Volume of water = 16 × 34 × 6 ft³ = 3264 ft³
1 ft³ = 28316.8 cm³; 3264 ft³ = 28316.8 × 3264 = 92426035.2 cm³
Density of water = 1 g/cm³
Mass of water = 92426035.2 cm³ × 1 g/cm³ = 92426035.2g
ΔT = 80°C - 50°C = 30°C, c = 4.18 J/g/K
Energy required to raise 92426035.2 g water by 30° C = 92426035.2 × 4.18 × 30
Energy required = 1.16 × 10¹⁰ J
Hence, number of moles of photons required = 1.16 × 10¹⁰ J/2.30 × 10⁵ J/mol
Number of moles of photons required = 5.04 × 10⁴ moles
-Convert 6.02 x 1020 formula units of MgCl₂ to mol of MgCl₂:
Answers
6.02 x \(10^{20\) formula units of MgCl₂ is equal to 0.1 moles of MgCl₂.
To convert formula units of MgCl₂ to moles of MgCl₂, we need to use Avogadro's number, which relates the number of formula units to the number of moles.
Avogadro's number (NA) is approximately 6.022 x 10^23 formula units per mole.
Given that we have 6.02 x 10^20 formula units of MgCl₂, we can set up a conversion factor to convert to moles:
(6.02 x 10^20 formula units MgCl₂) * (1 mol MgCl₂ / (6.022 x 10^23 formula units MgCl₂))
The formula units of MgCl₂ cancel out, and we are left with moles of MgCl₂:
(6.02 x 10^20) * (1 mol / 6.022 x 10^23) = 0.1 mol
Therefore, 6.02 x 10^20 formula units of MgCl₂ is equal to 0.1 moles of MgCl₂.
It's important to note that this conversion assumes that each formula unit of MgCl₂ represents one mole of MgCl₂. This is based on the stoichiometry of the compound, where there is one mole of MgCl₂ for every one formula unit.
Additionally, this conversion is valid for any substance, not just MgCl₂, as long as you know the value of Avogadro's number and the number of formula units or particles you have.
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What is the molarity of a solution containing 0.05 moles of solute in 0.25L of solution?
Answers
Answer:
0.2 M
Explanation:
The molarity is the number of moles per liter:
(0.05 moles)/(0.25 liter) = 0.2 moles/liter = 0.2 M
What other products do you think contain tartrazine?
Answers
Answer:
It is found in confectionery, cotton candy, soft drinks, instant puddings, flavored chips (Doritos, Nachos), cereals (corn flakes, muesli), cake mixes, pastries, custard powder, soups (particularly instant or "cube" soups), sauces, some kinds of rice (paella, risotto, etc.), Kool-Aid, Mountain Dew, Gatorade, ice cream
When 7.524 is rounded to 3 sig figs it will be
Answers
When 7.524 is rounded to 3 significant figures, it will be 7.52.
The process of changing a number to a nearby number with fewer significant digits is known as rounding.
Rounding can be done to the nearest integer, the nearest tenth, the nearest hundredth, and so on.
Here are some pointers on rounding numbers to a certain number of significant digits:If the digit following the last significant digit is less than 5, simply drop it and all following digits.
(round down)For example, 2.832 rounded to two significant digits is 2.8 since the 3 is followed by a 2 which is less than 5.
If the digit following the last significant digit is greater than 5, add 1 to the last significant digit, then drop all of the digits that follow it.
(round up)For example, 4.673 rounded to two significant digits is 4.7 since the 3 is followed by a 7 which is greater than 5.
If the digit following the last significant digit is exactly 5, the preceding digit is odd, and no other digits follow, increase the last significant digit by 1.
If the digit following the last significant digit is exactly 5, the preceding digit is even, and no other digits follow, simply leave the last significant digit alone.
For example, 2.875 rounded to two significant digits is 2.9 since the 5 is followed by an odd number, which means that the 8 should be rounded up, while 2.765 rounded to two significant digits is 2.8 since the 5 is followed by an even number, which means that the 6 should be left alone.
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At what temperature is a gas if 0.0851 moles of it is contained in a 604 mLvessel at 100.4 kPa?
Answers
Assuming the gas in question behaves as an ideal gas, we can use the Ideal Gas Law:
\(PV=nRT\)Where P is the pressure, V is the volume, n is the number of moles, R is the Ideal Gas Constant and T is the absolute temperature.
We have to match the units from R and the other variables.
The pressure is in kPa, so we can look for a R value that is also in kPa.
One such value is:
\(R\approx8.31446\frac{L\cdot kPa}{K\cdot mol}\)But the volume unit is in L, so we need to convert the volume we have:
\(V=604mL=0.604L\)Now, we have:
\(\begin{gathered} P=100.4kPa \\ V=0.604L \\ n=0.0851mol \\ R\approx8.31446\frac{L\cdot kPa}{K\cdot mol} \end{gathered}\)Solving the equation for T and substituting the values, we have:
\(\begin{gathered} PV=nRT \\ T=\frac{PV}{nR} \\ T=\frac{100.4\cdot kPa\cdot0.604\cdot L}{8.31446\cdot L\cdot kPa\cdot K^{-1}\cdot mol^{-1}\cdot0.0851mol} \\ T=\frac{100.4\cdot0.604}{8.31446^{}^{}\cdot0.0851}K \\ T=\frac{60.6416}{0.707560\ldots}K \\ T=85.70517\ldots K \\ T\approx85.7K \end{gathered}\)So, the temperature is approximately 85.7 K.
i have a picture of question
Answers
The mass of the cereal that you would need to consume can be obtained as 84.8 g
What is the number of moles?The number of moles, denoted by the symbol "n," is a fundamental unit of measurement in chemistry that represents the amount of a substance. It is used to quantify the quantity of atoms, molecules, or ions in a sample.
Number of moles of sucrose in the cereal = 11g/342 g/mol
= 0.03 moles
Now;
0.03 moles of sucrose is contained in 60 g of cereal
0.0424 moles of sucrose would contain 0.0424 moles * 60 g/0.03 moles
= 84.8 g
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Complete and balance the following half-reaction in acidic solution. Be sure to include the proper phases for all species within the reaction. NH3(g) → NO3- (aq)
Answers
NH3 (8) + 3H20 (1) NO₂ (aq) + 9H+ (aq) + 8e- is the balance of half-reaction in acidic solution .
The NH3 oxidation number is -3. The oxidation number of nitrogen in NO2 is +5. So, this is now available. As a result of the oxidation process, electrons will be released. In an acidic medium, each оудeт excess atom is balanced by adding the same number of water molecules on the side with fewer oxygen atoms and doubling the number of H+ ions on the other side. As a result, the balanced equation is: NH3 (8) + 3H20 (1) NO2 (aq) + 9H+ (aq) + 8e-. half-reaction is a portion of a larger reaction that represents either an oxidative stress or a reduction. To fully describe a redox, half, one oxidation and one decrease, are needed. In general, the half-reactions first were balanced individually by atomic nuclei. The quarter contain electrons. The amount of electrons lost is then balanced to balance the electron density gained. Finally, the half are combined. The concentration of hydrogen ions (H +start subscripts, plus, end superscript) in an acidic solution seems to be greater than that of pure water. A basic solution has a lower H +start superscript as well as end superscript density than pure water.
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What is the coefficient for sodium chloride when this equation is balanced?
Answers
Answer:
To resolve this, we need to place the coefficient “2” in front of the sodium in the reactant, to give the equation shown below. 2 Na (s) + Cl 2 (g) → 2 NaCl (s) In this equation, there are two sodiums in the reactants, two sodiums in the products, two chlorines in the reactants and two chlorines in the products; the equation is now balanced.
Explanation:
If mercury barometer is replaced by water barometer, height of water column
i. will be less than that of Hg Column
ii. will be greater than that of Hg column iii. will be equal to that of Hg column
iv. will be none of these
Answers
Answer:
answer is first one 1 will be less then that of hg coloumn
Solutions which can conduct electricity must contain:
atoms
minerals
molecules
ions
Answers
Answer
Ions
Explanation
Acetonitrile (CH3CN) is an important industrial chemical. Among other things, it is used to make plastic moldings, which have multiple uses, from car parts to Lego bricks. Which one of the following statements about acetonitrile is not correct?a. Acetonitrile has 16 valence electrons in its Lewis structure. b. Acetonitrile has one triple bond. c. Acetonitrile has one pair of nonbonding electrons. d. All atoms satisfy the octet rule in acetonitrile. e. One carbon atom and the nitrogen atom have nonzero formal charges.
Answers
Answer:
One carbon atom and the nitrogen atom have nonzero formal charges.
Explanation:
The compound Acetonitrile has sixteen valence electrons as is easily San from its structure. It contains a carbon nitrogen triple bond with a lone pair of electrons on nitrogen. All atoms satisfy the octet rule and there is no hyper valent atom in the molecule.
The formal charge an carbon and nitrogen is calculated as follows;
No. of valence electron on atom - [non bonded electrons + no. of bonds]
Therefore, for carbon and nitrogen, we have;
formal charge on carbon = 4 - (0 + 4) = 0
formal charge on nitrogen = 5 - (2 + 3) = 0
Hence carbon and nitrogen both possess zero formal charges.
How many grams of lead will be produced if 2.54g of PbS is burned with 1.88g of O2? write the equation
Answers
If 2.54 g of PbS is burned with 1.88 g of O2, approximately 2.20 grams of Pb will be produced.
The balanced equation for the reaction of lead sulfide (PbS) with oxygen (O2) to produce lead (Pb) and sulfur dioxide (SO2) is as follows:
2PbS + 3O2 -> 2Pb + 2SO2
From the balanced equation, we can see that the stoichiometric ratio between PbS and Pb is 2:2 or 1:1. This means that for every 1 mole of PbS, 1 mole of Pb is produced.
To calculate the number of moles of PbS, we need to divide the given mass (2.54 g) by its molar mass:
Molar mass of PbS = 207.2 g/mol (Pb) + 32.07 g/mol (S) = 239.27 g/mol
Moles of PbS = 2.54 g / 239.27 g/mol = 0.0106 mol
Since the stoichiometric ratio between PbS and Pb is 1:1, the number of moles of Pb produced is also 0.0106 mol.
To calculate the mass of Pb, we multiply the number of moles by its molar mass:
Molar mass of Pb = 207.2 g/mol
Mass of Pb = 0.0106 mol x 207.2 g/mol = 2.20 g
This calculation is based on the stoichiometric ratio between PbS and Pb, where 1 mole of PbS produces 1 mole of Pb. By converting the given mass of PbS to moles and then multiplying by the molar mass of Pb, we can determine the mass of Pb produced.
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1. Write the IUPAC names for the following 1.1 1.2 N 1.3 O NO2 x Y ·0 OH 5
Answers
1. The IUPAC name of N is nitrogen.
2. Nitrogen dioxide
3.The IUPAC name of O is oxygen
4.The IUPAC name of OH is hydroxyl.
The IUPAC name of ·0 is a radical. It is commonly found in organic chemistry and plays an important role in many reactions.
IUPAC names for the given compounds are:1.1. N: Nitrogen
The IUPAC name of N is nitrogen.
It is a non-metal and belongs to group 15 in the periodic table. It has an electronic configuration of 1s2 2s2 2p3.1.2. NO2: Nitrogen dioxide
Explanation: NO2 is a chemical compound that is formed by the combination of nitrogen and oxygen. It is a reddish-brown gas that has a pungent odor.
The IUPAC name of NO2 is nitrogen dioxide.1.3. O: Oxygen
Explanation: The IUPAC name of O is oxygen.
It is a non-metal and belongs to group 16 in the periodic table. It has an electronic configuration of 1s2 2s2 2p4.
X: UnknownExplanation: No IUPAC name can be given to an unknown compound as the structure and composition are not known.
Y: Hydroxyl Explanation: The IUPAC name of OH is hydroxyl.
It is a functional group that is composed of an oxygen atom and a hydrogen atom (-OH). It is commonly found in alcohols and phenols. ·0: RadicalExplanation: A radical is a molecule or an ion that contains an unpaired electron.
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Note: The complete question is given below
Provide the IUPAC names for the following compounds:
\(CH_3CH_2CH(CH_3)CH_2CH_2CH_2CH_3\)
C6H5CH(CH3)2
H2NCH2CH2CH2CH2CH2NH2
CH3CH2CH2CH2CH2OH
CH3CH2CH2CHOHCH3
To what temperature should you heat a sample of air initially at 315K to increase its volume by 25% ?
Answers
The sample of air should be heated to 252 Kelvin (K) to increase its volume by 25%.
It is possible to determine the temperature to which the sample of air should be heated by using the concept of the ideal gas law. PV = nRT is the ideal gas law, and it relates the pressure (P), volume (V), number of moles (n), temperature (T), and gas constant (R). we can focus on the relationship between volume and temperature since the number of moles and pressure are assumed to be constant.
By showing the increase in volume as a percentage (25%), we can make the equation (V+0.25V)/T = V/T, where V represents the initial volume of the air.
On making the equation simple, we find Tfinal / Tinitial = 1.25.
To solve for Tfianal, the final temperature,
Tfinal = Tinitail / 1.25
On substituting the initial temperature value of 315K into the equation, we will be getting;
Tfinal = 315K / 1.25
Tfinal = 252K
Hence, the sample of air should be heated to 252 Kelvin (K) in order to increase its volume by 25%.
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Deposition can occur where wind or running water slows down? true or false
Answers
Answer:
The answer is True.
Explanation:
For a solution, [OH-] = 4 x 10-11M.
What is the pOH?
What is the pH?
Answers
Answer:
answer is what is the pH number is that Our New account last name is Our brothers name he will be happy to
The pOH of the solution is 10.4
The pH of the solution is 3.6
Calculating pOH & pHFrom the question, we are to determine the pOH and pH of the solution
pOH can be calculated by using the formula
pOH = -log[OH⁻]
From the question,
[OH⁻] = 4×10⁻¹¹ M
∴ pOH = -log(4×10⁻¹¹)
pOH = 10.4
Hence, the pOH of the solution is 10.4
Now, for the pH
Using the formula,
pH + pOH = 14
Then, we can write that
pH = 14 - pOH
∴ pH of the solution is
pH = 14 - 10.4
pH = 3.6
Hence, the pH of the solution is 3.6
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what is the difference between crystalline and amorphous solid..???
Answers
Answer:
Crystalline solids have regular ordered arrays of components held together by uniform intermolecular forces, whereas the components of amorphous solids are not arranged in regular arrays.
Explanation:
Arrange these acids according to their expected pKą values. (Highest to lowest)
CH₂CH₂COOH
CI2CHCOOH
CICH₂COOH
CICH₂CH₂COOH
Answers
How many cups are in five gallons?
Answers
Answer:
In 5 US liquid gallons, there are 80 cups.
Explanation:
To get from gallons to cups, just multiply the amount of gallons you have by 16.
What is the difference between 0.50 mol HCl and 0.50 M HCl?
Answers
Answer:
Here you go
Explanation:
lewis structure of SeO3
Answers
Here it is, you know... Googling helps :)
The Lewis structure of SeO₃ is attached to the image below.
Selenium (Se) is in Group 16 of the periodic table, so it has 6 valence electrons. Oxygen (O) is in Group 16 as well, so each oxygen atom contributes 6 valence electrons. Since there are three oxygen atoms, the total number of valence electrons is:
6 (valence electrons of Se) + 6 (valence electrons of each O) 3 (number of O atoms)
= 6 + 18 = 24
The central atom in SeO3 is selenium (Se) since it is less electronegative than oxygen and can accommodate more than two bonded atoms.
Place the selenium atom in the center and connect it to each oxygen atom using a single bond. Each bond consists of two electrons.
Subtract the number of electrons used in step 3 from the total number of valence electrons: 24 (total valence electrons) - 6 (bonds) = 18
Distribute the remaining 18 electrons around the atoms to satisfy the octet rule.
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A 10.57 g sample of an unknown metal was heated to 100.00 ºC in boiling water and then transferred to a 104.0 g water bath at 22.50ºC. The temperature of the water bath rose to a maximum of 24.15ºC. What is the specific heat of the metal in cal/gºC ?
Answers
According to the problem the specific heat of the metal is 0.0329 cal/g°C.
What is specific heat?Specific heat is the amount of heat energy required to raise the temperature of a unit mass of a substance by one degree. It is usually expressed in units of joules per kilogram-kelvin (J/kg-K). It is an important physical property of a substance that affects the rate of heat transfer.
The specific heat of a metal can be calculated using the equation, q = mcΔT,
where q is the amount of heat energy,
m is the mass of the metal sample,
c is the specific heat, and
ΔT is the change in temperature. In this problem, q = 10.57 g × c × (24.15ºC - 22.50ºC) = 2.85 g × c.
The amount of heat energy required to raise the temperature of the water bath can be calculated using the equation q = mcΔT,
where q is the amount of heat energy, m is the mass of the water bath,
c is the specific heat of water (4.184 J/g°C), and
ΔT is the change in temperature. In this problem, q = 104.0 g × 4.184 J/g°C × (24.15ºC - 22.50ºC) = 86.67 J.
The specific heat of the metal can be calculated by dividing the amount of heat energy required to raise the temperature of the metal sample by the amount of heat energy required to raise the temperature of the water bath. This gives us c = 2.85 g × c / 86.67 J = 0.0329 cal/g°C.
Therefore, the specific heat of the metal is 0.0329 cal/g°C.
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Substances A and B react with each other such that A is 75% consumed in 16 minutes and A is 87.5% consumed in 24 minutes. Changing the concentration of B has no effect on the reaction rate. The reaction is:
a. Zero order in both A and B.
b. First order in both A and B.
c. Second order in A and zero order in B.
d. First order in A and zero order in B.
e. There is insufficient information to answer this question.
Answers
Option d. First order in A and zero order in B. The reaction rate can be determined by the rate of change of concentration of the reactant over time.
In this case, the reaction is first order in A, meaning the reaction rate is proportional to the concentration of A. This can be seen as the reaction rate is the same even when the concentration of B is changed, implying that B has no effect on the reaction rate. On the other hand, the reaction is zero order in B, meaning the reaction rate is independent of the concentration of B. This means that the reaction rate is proportional to the concentration of A and is independent of the concentration of B. This can be observed from the fact that the reaction rate remains the same when the concentration of B is changed, implying that B has no effect on the reaction rate. On the other hand, the reaction rate is directly proportional to the concentration of A, meaning that as the concentration of A increases, the reaction rate also increases. Therefore, the reaction is first order in A and zero order in B.
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