Answer:
The correct answer is -1059.45 kJ.
Explanation:
The balanced equation is:
6Cr₂⁺ + Cr₂O₇²⁻ + 14H⁺ ⇒ 8Cr₃⁺ + 7H₂O
In the mentioned reaction 6 electrons are transferred
By calculating Ecell with the use of reduction potential of each cell:
Ecell = Eox + Ered
Ered = 0.50V
Eox = -Ered = -(-0.50V) = 0.50V
Ered = 1.33V
Ecell = 0.50V + 1.33V
Ecell = 1.83V
Now in order to calculate ΔG
n = 6, Faraday constant (f) = 9.68470 × 10⁴ = 96847 C mol⁻¹
ΔG = -nFE
ΔG = -6 × 96487 C mol-1 × 1.83V
ΔG = -1059.42 KJ
The relation between ΔG and ΔG°rxn
ΔG = ΔG° + RTlnQ
Under the standard condition Q = 1 and ΔG = ΔG°
Thus,
ΔG°rxn = ΔG = -1059.42 KJ
What volume does 43.5 g of n2 occupy at stp? (r = 0.08206 l⋅atm/mol⋅k)?
V =
n·R·T / p.
V(N₂) = 1.55 mol · 0.08206 L·atm/mol·K · 273 K /
1.00 atm.
V(O₂) = 34.72 L.
Sodium is produced by electrolysis of molten sodium chloride. what are the products at the anode and cathode, respectively?
Answer is: chlorine and sodium.
Molten sodium chloride is separeted::
2NaCl(l) → 2Na(l) + Cl₂(g),
but first ionic bonds in this salt are separeted
because of heat:
NaCl(l) → Na⁺(l) + Cl⁻(l).
Reaction of reduction at cathode(-): Na⁺(l) + e⁻ → Na⁰(l) /×2.
2Na⁺(l) + 2e⁻ → 2Na(l)
Reaction of oxidation
at anode(+): 2Cl⁻(l) → Cl₂(g) + 2e⁻.
The anode is positive and the cathode is negative.
In electrolysis of molten sodium chloride, sodium metal is produced at the negatively charged cathode and chlorine gas is produced at the positively charged anode.
Explanation:The process of producing sodium via the electrolysis of molten sodium chloride involves a Downs cell. In this setup, sodium ions migrate to the negatively charged cathode, pick up electrons, and are reduced to sodium metal. Chloride ions, meanwhile, migrate to the positively charged anode, lose electrons, and undergo oxidation to form chlorine gas. Therefore, at the cathode, the product is sodium metal and at the anode it is chlorine gas.
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What is the concentration, in mass percent, of a solution prepared from 50.0 g nacl and 150.0 g of water?
This tea kettle shows a change in the state of matter of water. Which part of the water cycle represents the same change in state?
Answer:
The answer to the question you asked, "This tea kettle shows a change in the state of matter of water. Which part of the water cycle represents the same change in state?", is D. Lake water evaporates into the atmosphere.
Explanation:
The process of evaporation refers to the changing state of water from liquid to gaseous (vapor) state.
In the given condition, a tea kettle is placed, where the water evaporates due to the increased amount of heat provided to it. This allows the water to evaporate into the atmosphere forming water vapor.
One of the cases that shows a similar changing state of water is the evaporation of the lake water due to the high absorption of solar energy, that releases water vapor into the atmosphere.
Thus, the correct answer is option (D).
What type of bond would occur between carbon (C) and nitrogen (N)?
A. Metallic bond
B. Ionic bond
C. Paired bond
D. Covalent bond
Which one of the following compounds is not covalent?
A. HCI
B. S2CI2
C. KCI
D. SCI2
(P.S. The answer turned out to be C. KCI)
Answer:
KCl
Explanation:
Hello,
Potassium chloride is well-known as an ionic compound owing to the shown-below greater-than-1.7 difference between the electronegativities of potassium and chlorine:
[tex]\Delta E=E_{Cl}-E_K=3.16-0.82\\\Delta E=2.34[/tex]
This is by cause of the fact that such compounds that have a difference in the constituent elements' electronegativities greater than 1.7 are considered as ionic.
Best regards.
A 100.0 ml sample of 0.10 m ca(oh)2 is titrated with 0.10 m hbr. determine the ph of the solution after the addition of 400.0 ml hbr. the chemical equation is below. ca(oh)2 (aq) + 2hbr (aq) → cabr2 (aq) + h20 (l)
A compound contains 46.7% nitrogen and 53.3% oxygen by mass. What is the empirical formula of the compound?
Calcium carbonate reacts with hydrobromic acid to form calcium bromide, carbon dioxide, and water according to the reaction below. what is the molarity of the hydrobromic acid if 250.0 ml of it reacts with 5.64 grams of calcium carbonate?
PLEASE HELP NOW!!!!!!!
What is the number of moles hydrogen produced when 6 moles of sodium are used?
2Na + 2H2O -> 2NaOH + H2
What is the ph of a solution with [h3o+] = 1 × 10-9 m?
The pH of a solution with a hydronium ion concentration of 1 × 10-9 M is 9, indicating that the solution is basic.
Explanation:The pH of a solution is calculated by taking the negative logarithm of the hydronium ion concentration ([H3O+]). In this case, the hydronium ion concentration is given as 1 × 10-9 M. To find the pH of the solution, you would use the following equation:
pH = -log [H3O+]
In this example:
pH = -log(1 × 10-9)
Therefore, the pH is 9.
Since pH values less than 7.0 are acidic, values greater than 7.0 are basic, and a pH of 7.0 is neutral, this solution with a pH of 9 is considered basic.
which city would most likely be the epicenter of an earthquake : san francisco, california, st. paul, minnesota,
An excited state of a particular atom has a mean lifetime of 6.2×10−10 s , which we may take as the uncertainty δt.
A percent composition analysis yields 46.7% nitrogen and 53.3% oxygen. What is the empirical formula for the compound
Answer:NO
Explanation:
it just is
An aqueous solution of glycerol, c3h8o3, is 48.0% glycerol by mass and has a density of 1.120 g ml-1. calculate the molality of the glycerol solution.
To calculate the molality of a 48.0% glycerol solution, take 48.0% of a 100g sample as glycerol (48.0g), find the moles of glycerol, and then divide by the mass of water in kilograms. The resulting molality of the solution is 10.02 mol/kg.
To calculate the molality of a glycerol solution that is 48.0% glycerol by mass with a density of 1.120 g/ml, we can follow these steps:
Determine the mass of glycerol and water in a given volume of the solution.
Convert the mass of glycerol to moles using its molar mass.
Calculate the molality using the definition that molality is moles of solute per kilogram of solvent (water).
Let's assume we have 100 grams of this solution to make the calculation straightforward. Since the solution is 48.0% glycerol by mass, we have 48.0 g of glycerol and 52.0 g of water. The molar mass of glycerol, C₃H₈O₃, is approximately 92.09 g/mol. Therefore, the moles of glycerol are calculated as:
48.0 g C₃H₈O₃ / 92.09 g/mol = 0.521 moles C₃H₈O₃
The mass of water needs to be in kilograms for the molality calculation:
52.0 g water * 1 kg/1000 g = 0.052 kg water
Finally, the molality of the glycerol solution can be calculated as:
0.521 moles C₃H₈O₃ / 0.052 kg water = 10.02 m
Now, to express the molality in the standard unit of mol/kg, we use the previously calculated values. Thus, the molality of the solution would be 10.02 mol/kg.
What volume of so2 is produced at 325 k and 1.35 atm when 15.0 grams of hcl reacts with excess k2so3?
First, the balanced chemical reaction between HCl and K2SO3 is figured out. Then, using the molar mass of HCl, the number of moles are calculated. Finally, using the ideal gas law, the volume of SO2 produced is calculated as around 5.61 litres.
Explanation:First, we need to figure out the balanced chemical reaction. The reaction of HCl with K2SO3 produces KCl, H2O, and SO2. The balanced reaction equation would look like this: 2HCl + K2SO3 -> 2KCl + H2O + SO2.
Next, we need to find out how many moles of HCl we have. 15.0 grams of HCl is around 0.411 moles (since molar mass of HCl is approximately 36.46 g/mol). According to the balanced reaction, for every 2 moles of HCl, we get 1 mole of SO2. Hence, our 0.411 moles of HCl would produce around 0.205 moles of SO2.
Finally, to find the volume of SO2 produced we can use the ideal gas law: PV=nRT. Given: Pressure(P) = 1.35 atm, Gas constant(R) = 0.0821 L.atm/(mol.K), Temperature(T) = 325K. By substituting these values in the ideal gas law, we get the volume (V) as 5.61 Litres.
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What volume of so2 is produced at 325 k and 1.35 atm when 15.0 grams of hcl reacts with excess k2so3?
The volume of SO₂ produced at 325k is calculated as below
calculate the moles of SO₂ produced which is calculated as follows
write the reacting equation
K₂SO₃ +2 HCl = 2KCl +H₂O+ SO₂
find the moles of HCl used=mass/molar mass = 15g/ 36.5 g/mol =0.411 moles
by use of the mole ratio between HCl to SO₂ which is 2:1 the moles of SO₂ is, therefore, = 0.411 /2 =0.206 moles of SO2
use the ideal gas equation to calculate the volume SO₂
that is V=nRT/P
where n=0.206 moles
R(gas constant) = 0.082 L.atm/ mol.k
T=325 K
P=1.35 atm
V=(0.206 moles x 0.082 L.atm/mol.k x325 k)/1.35 atm = 4.07 L of SO₂
Predict whether or not a precipitate forms upon mixing 175.0 ml of a 0.0055 mkcl solution with 145.0 ml of a 0.0015 m agno3 solution. identify the precipitate, if any.
the Temperature of a sample of an ideal gas in a sealed 5.0 l container is raised from 27 oC to 77oC. If the initial pressure of the gas was 3.0 atm, what is the final pressure?
Which of the following classes of organic compounds has COOH as the functional group
Alkane
Carboxylic acid
Aldehyde
Ether
Carboxylic acid is an organic compound that has COOH as the functional group.
What are functional groups?
Functional group is defined as a substituent or group of toms or an atom which causes chemical reactions.Each functional group will react similarly regardless to the parent carbon chain to which it is attached.This helps in prediction of chemical reactions.
The reactivity of functional group can be enhanced by making modifications in the functional group .Atoms present in functional groups are linked to each other by means of covalent bonds.They are named along with organic compounds according to IUPAC nomenclature.
Functional group inter conversion is also possible by retro -synthesis.In some cases , functional groups can be charged molecules.
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How many neutrons must an 5626fe nucleus capture to generate the unstable intermediate [7326fe] according to the equation: 5626fe+ ? 10n→[7326fe]?
Given the reaction that occurs in an electrochemical cell: zn(s) + cuso4(aq) znso4(aq) + cu(s) during this reaction, the oxidation number of zn changes from
Answer : The correct answer is oxidation number of Zn changes from 0 to +2.
Oxidation number :
It is number given to an element when it undergoes oxidation by loosing electrons . Oxidation number is equal to number of electrons donated . It is generally represented as charge .
Oxidation number of any element in a compound can be calculated as :
(Total number of positive charge) + (total number of negative charge) = total charge on compound
Where : Total positive charge = No. of atom or polyatomic molecule * positive charge on it
Total negative charge = No. of atom or polyatomic molecule * negative charge on it
Total charge on compound = Charge lying on top of compound .
Following steps can be used to find change in oxidation number of Zn :
Step 1 ) : To find oxidation number of Zn ( reactant side ) :
On reactant side Zn is present in solid state or its elemental state . It is not attached to any other atom , hence it is neutral and isolated atom. So oxidation number on Zn(s) is 0 .
Step 2: To find oxidation number of Zn in ZnSO₄ (aq)
ZnSO₄(aq) is ionic compound compound . It has two ions in it, Zn and SO₄ . Also it is a neutral compound means it has zero charge on it .
SO₄ is sulfate which has -2 charge or oxidation number on it (image attached )and there is one molecule of SO₄ ion . There is one atom of Zn which has unknown charge or oxidation number (x) .
To calculate oxidation number on Zn ion , plug values in above formula :
(No of Zn atom * charge on it ) + (No of SO₄ molecule * charge on it ) = Total charge on ZnSO₄
( 1* charge on Zn ) + ( 1* -2 ) = 0
Charge on Zn + (-2) = 0
Charge on Zn = +2
On reactant side Zn(s) has Zero charge and on product side Zn in ZnSO₄(aq) has +2 charge .
Hence the charge in oxidation number of Zn is from 0 to +2 .
In an ionic bond:
A. The atoms swap electrons.
B. Both atoms share their electrons.
C. The atoms attract each other but their electrons do not interact.
D. One atom accepts electrons from another.
Answer:
One atom accepts electrons from another.
Explanation:
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What volume of hydrogen will be produced at STP by the reaction of 78.33 g of aluminum with excess water
The reaction of 78.33 g of aluminum with excess water will produce approximately 97.44 L of hydrogen gas at standard temperature and pressure.
Explanation:The reaction of aluminum with water produces hydrogen gas. To determine the volume of hydrogen that will be produced, you have to use stoichiometry.
Firstly, we need to convert the mass of aluminum to moles of aluminum using its atomic mass (26.98 g/mol). So, 78.33 g Al * (1 mol Al / 26.98 g Al) = ~2.90 moles of Al.
Secondly, we use the balanced chemical reaction for the reaction of aluminum with water, which is 2Al + 6H2O -> 2Al(OH)3 + 3H2. This shows us that for every 2 moles of Al reacted, 3 moles of H2 are produced.
Therefore, if we have 2.90 moles of Al, it would produce (2.90 moles Al * 3 moles H2 / 2 moles Al) = ~4.35 moles of H2.
Finally, at STP conditions, 1 mole of any gas occupies a volume of 22.4 L. Therefore, 4.35 moles of H2 will occupy (4.35 moles H2 * 22.4 L/mol) = 97.44 L of H2.
So, the reaction of 78.33 g of aluminum with excess water will produce approximately 97.44 L of hydrogen gas at STP.
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PLZ HELP ASAP IWILL GIVE BRAINLIEST coastline on Earth experienced a high tide at 6 a.m. At what approximate time will the next low tide occur, and why?
6 p.m., because the coastline will turn 90 degrees from the moon
6 p.m., because the coastline will turn 180 degrees from the moon
12 noon, because the coastline will turn 90 degrees from the moon
12 noon, because the coastline will turn 180 degrees from the moon
When the Earth experienced a high tide at 6 a.m, the approximate time will the next low tide occur will be C. 12 noon, because the coastline will turn 90 degrees from the moon.
How to explain the tide?It should be noted that all around the world, the water is rising and falling at a point. When, it rises, it's known a a high tide.
In this case, when it falls, it's know a a slow tide. The low tide occurs on every 12 hours which is 6 hours after the high tides. Therefore, the correct option is C.
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The next low tide will occur at 12 Noon, because the coastline will turn 90 degrees from the moon.
Explanation:
All around the world, along the coastlines, it can be noticed that everyday the water is rising at some points, and then it is retracting at some points. When the water rises it is called a high tide, while when the water is retracting it is called low tide. Both of these tides occur twice every day.
In this case, we have a high tide occurring at 6 AM, meaning that the other high tide will occur at 6 PM, when the moon circles by 180 degrees from the coastline. The low tide also occurs on every 12 hours, which occurs roughly 6 hours after the high tides, so in this case the low tides will occur at 12 Noon and at 12 Midnight. There are variations among the tides, depending on the relative position of the Earth, Moon, and Sun towards each other, some being:
The ka of hf is 6.8 x 10-4. what is the ph of a 0.35 m solution of hf?
You make a solution by putting 45.6g of iron lll carbonate into 167ml of water. What is it's molarity?
You also need 25ml of a .672M Nickel ll hydroxide solution. Explain how to make that.
Now write the balanced equation that occurs when you put these two reactants together. The molarity of the iron product will be .05 and the molarity of the nickel product will be 1.45. At equilibrium, what will be favored?
The osmotic pressure of a solution formed by dissolving 45.0 mg of aspirin (c9h8o4) in enough water to make 0.250 l of solution at 25°c is ________ atm
The osmotic pressure of the solution can be calculated using the formula Π = MRT. First, convert the mass of aspirin to moles, then calculate the molarity by dividing the moles by the volume. Finally, calculate the osmotic pressure using the molarity, ideal gas constant, and temperature.
Explanation:The osmotic pressure of a solution can be calculated using the formula:
Π = MRT
Where Π is the osmotic pressure, M is the molarity of the solution, R is the ideal gas constant, and T is the temperature in Kelvin.
In this case, we are given the mass of aspirin and need to calculate the molarity to determine the osmotic pressure.
First, we need to convert the mass of aspirin to moles:
45.0 mg x (1 g/1000 mg) x (1 mol/180.16 g) = 0.000249 mol
Next, we need to calculate the molarity:
M = moles/volume = 0.000249 mol/0.250 L = 0.000996 M
Finally, we can calculate the osmotic pressure:
Π = (0.000996 M)(0.0821 L. atm/mol. K)(298 K) = 0.0246 atm
Which two layers of Earth are mainly composed of metallic elements such as nickel and iron, which are abundant in meteoroids and comets?
This layer of the earth lies between the mantle and the solid inner core. It is the only liquid layer, a sea of mostly iron and nickel about 1,400 miles. The lava is mostly made up of iron and nickel. The outer core creates the Earth's magnetic field. The final layer is the inner core, which is 900 miles deep. Scientists believe the inner core is a solid ball of iron and other minerals.
Identify the missing daughter nucleus in the β– emission decay of 106ru below.
β⁻ emission is an
emission of an electron from the parent atom while converting a neutron into a
proton. Hence, the formed daughter nucleus has the same
number of mass but the atomic number is higher by 1 and number of neutrons is
lower by one than the parent atom.
After a β⁻ emission of ¹⁰⁶Ru, the formed daughter nucleus
should have 106 as mass number but (44 + 1) = 45 as the atomic number.
Hence the daughter nucleus is Rh (Rhodium) which has 45 protons
(atomic number).