The electron's starting energy level was 1.73.
We can use the energy formula E=hc/λ, where E is the energy of the photon, h is Planck's constant, c is the speed of light, and λ is the wavelength of the photon.
First, let's convert the given wavelength to meters:
λ = 410 nm = 410 × 10⁻⁹ m
Next, we can substitute the given values into the energy formula to find the energy of the emitted photon:
E = (6.626×10⁻³⁴ J s) × (2.998×10⁸ m/s) / (410×10⁻⁹ m) = 4.846×10⁻¹⁹ J
The energy of the emitted photon corresponds to the difference in energy levels between the initial and final states of the electron in the hydrogen atom. We can use the formula for the energy levels of a hydrogen atom: E = -R[infinity] / n², where R[infinity] is the Rydberg constant for hydrogen and n is the principal quantum number.
If the electron transitioned from an initial energy level with principal quantum number n1 to a final energy level with n2 = 2, then we can set up an equation to solve for n1:
E = -R[infinity] × (1/n₂² - 1/n₁²)
Substituting the given values into the equation and solving for n1, we get:
n₁² = (R[infinity] × (1/n₂² - E / R[infinity]))⁻¹ = 3.00
Therefore, the initial energy level of the electron was n1 = √(3) ≈ 1.73 (rounded to the nearest whole number).
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Identify the element whose ion can exist as 2+ or 4+
Answer:
Palladium (Pl), Platinum (Pt), or Lead (Pb)
Explanation:
Palladium, Platinum, and Lead have possible charges of +2 and +4.
Consider the reaction 2NH3 (g) #!!!"! N2 (g) + 3H2 (g)
at a temperature where K = 3. 0 x 10-8. In an experiment, 1. 0 x 10-3 mol NH3, 1. 0 x 10-1
mol H2, and 1. 0 mol N2 are mixed in a 5. 0 L vessel
NH₃, N₂, and H₂ are present in concentrations of 0.00144 mol/L, 6.75 x [tex]10^{-13}[/tex] mol/L, and 5.08 x [tex]10^{-2}[/tex] mol/L, correspondingly.
To determine whether the reaction will proceed in the forward or reverse direction, we can calculate the reaction quotient, Q, which is defined as the product of the concentrations of the products raised to their stoichiometric coefficients divided by the product of the concentrations of the reactants raised to their stoichiometric coefficients.
Q = [N₂] [H₂]³ / [NH₂]²
Plugging in the given concentrations, we get:
Q = (1.0 mol/L)² (1.0 x [tex]10^{-1}[/tex] mol/L)³ / (1.0 x [tex]10^{-3}[/tex] mol/L)²
= 1.0 x [tex]10^{13}[/tex]
Comparing Q to the equilibrium constant K, we see that Q is much larger than K, which means that the reaction will proceed in the reverse direction to reach equilibrium. In other words, some of the N₂ and H₂ will react to form more NH₂ until Q equals K.
To determine the equilibrium concentrations of NH₃, N₂, and H₂, we can use the equilibrium constant expression:
K = [N2] [H2]³ / [NH3]²
Rearranging and solving for [NH₃], we get:
[NH₃]² = [N₂] [H₂]³ / K
[NH₃] = √([N₂] [H₂]³ / K)
Plugging in the given concentrations and K, we get:
[NH₃] = 0.00144 mol/L
Similarly, we can find the equilibrium concentrations of N₂ and H₂:
[N₂] = K [NH₃]² / [H₂]³
= (3.0 x [tex]10^{-8}[/tex]) (0.00144 mol/L)² / (1.0 x [tex]10^{-1}[/tex]mol/L)³
= 6.75 x [tex]10^{-13}[/tex] mol/L
[H₂] = K [NH₃]² / [N₂]
= (3.0 x [tex]10^{-8}[/tex]) (0.00144 mol/L)² / (6.75 x [tex]10^{-13}[/tex] mol/L)³
= 5.08 x [tex]10^{-2}[/tex] mol/L
Therefore, at equilibrium, the concentrations of NH₃, N₂, and H₂ are 0.00144 mol/L, 6.75 x [tex]10^{-13}[/tex]mol/L, and 5.08 x [tex]10^{-2}[/tex] mol/L, respectively.
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What is the molarity of a solution that contains 1.45 moles of a solute in 750.0 mL of solution?
Answer: 1.93 M
Explanation:
Molarity is Moles / Liters
1.45/0.75 L
what volume of a concentrated hcl solution, which is 36.0 % hcl by mass and has a density of 1.179 g/ml , should be used to make 11.10 l of an hcl solution with a ph of 1.70?
The volume of concentrated HCl solution needed to make 11.10 L of an HCl solution with a pH of 1.70 is 9.41 mL.
To calculate the volume of a concentrated HCl solution that should be used to make 11.10 L of an HCl solution with a pH of 1.70, the following steps should be followed:
Step 1: Determine the molarity of HCl in the final solutionThe pH of the solution is given as 1.70. This means that the concentration of H3O+ ions in the solution is 0.020 M (since pH + pOH = 14 and pOH = 14 - pH = 14 - 1.70 = 12.30; [H3O+] = 10-pH).
Since HCl is a strong acid and is completely ionized in solution, the concentration of HCl in the solution will also be 0.020 M.
Step 2: Calculate the number of moles of HCl needed to make 11.10 L of a 0.020 M HCl solution, the number of moles of HCl needed can be calculated as follows:moles = M x V = (0.020 M) x (11.10 L) = 0.222 mol
Step 3: Determine the mass of HCl needed to calculate the mass of HCl needed, we need to use the molarity and density of the concentrated HCl solution. Since the solution is 36.0% HCl by mass, this means that it contains 36.0 g HCl per 100 g of solution.
Therefore, the mass of HCl in 1 L of the solution is: mass of HCl = (36.0 g HCl / 100 g solution) x (1000 mL / 1 L) x (1 L) = 360 g HCl/L.
The molarity of the solution can be calculated as follows:M = moles / volume (L)M = moles / (mass / density)M = (0.222 mol) / (mass / density)0.020 M = (0.222 mol) / (mass/density)mass / density = (0.222 mol) / (0.020 M)mass / density = 11.10 gmass = 11.10 g x (1 mL / 1.179 g) = 9.41 mL
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Pasos a seguir para realizar la nomenclatura común y la nomenclatura IUPAC
Both the common nomenclature and the IUPAC nomenclature are used to name chemical compounds. Common nomenclature: Determine the type of chemical compound. IUPAC nomenclature: Determine the type of chemical substance.
Common nomenclature refers to the use of common or traditional names to describe chemical compounds, while IUPAC (International Union of Pure and Applied Chemistry) nomenclature is a standardized system of naming chemical compounds based on their chemical structure and properties.
Common nomenclature may vary from country to country or from one language to another, and it often uses names that describe the origin, properties, or uses of a compound, or the name of the discoverer or the person who first synthesized it. For example, the common name for acetylsalicylic acid is aspirin.
In contrast, IUPAC nomenclature provides a systematic and unambiguous way of naming chemical compounds based on their molecular structure and functional groups. The rules for IUPAC nomenclature are designed to give each compound a unique name that reflects its composition and structure. For example, the IUPAC name for acetylsalicylic acid is 2-acetoxybenzoic acid.
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At STP, 6.5 moles of nitrogen gas, N2 , occupy a volume of 145 liters. How many moles of nitrogen gas, N2 , occupy a volume of 179 liters at STP?
What do all types of electromagnetic radiation have in common? Choose more than one answer.
Answer:
1)
Stream of photons
2)Energy in atoms
3)Speed of 300,000 kilometers per second
4)Travel through vacuum of space
Explanation:
The various forms of electromagnetic radiation share the following traits:
flow of photons
The power of atoms
300,000 kilometres per second in speed
traverse the void of space
Hence, the appropriate responses are:
Stream of photons
Energy in atoms
Speed of 300,000 kilometers per second
Travel through vacuum of space
How many milliliters of a 0. 8 M solution of citric acid would be needed to react with 15 grams of baking soda? Please show work
74.4 mL of a 0.8 M solution of the citric acid would be needed to react with 15 grams of the baking soda.
The balanced chemical equation for the reaction between citric acid (H₃C₆H₅O₇) and baking soda (NaHCO₃) is:
H₃C₆H₅O₇ + 3 NaHCO₃ → Na₃C₆H₅O₇ + 3 CO₂ + 3 H₂O
From the balanced equation, we can see that one mole of citric acid (H₃C₆H₅O₇) reacts with three moles of baking soda (NaHCO₃). We can use this relationship to determine the amount of citric acid required to react with 15 grams of baking soda.
Calculate the number of moles of the baking soda
The molar mass of baking soda (NaHCO₃) is:
23.00 g/mol (Na) + 1.01 g/mol (H) + 12.01 g/mol (C) + 3x16.00 g/mol (O) = 84.01 g/mol
The number of moles of baking soda (NaHCO₃) present in 15 grams can be calculated as:
15 g / 84.01 g/mol = 0.1785 mol
Calculate the number of moles of citric acid required
From the balanced chemical equation, we know that 1 mole of citric acid reacts with 3 moles of baking soda. Therefore, the number of moles of citric acid required is:
0.1785 mol / 3 = 0.0595 mol
Calculate the volume of 0.8 M citric acid required
The concentration of citric acid is given as 0.8 M, which means that there are 0.8 moles of citric acid per liter of solution. We can use this information to calculate the volume of citric acid required:
0.0595 mol / 0.8 mol/L = 0.0744 L
= 74.4 mL
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3. Which is not true about natural
selection?
The statement that is not true of natural selection is: Natural selection controls evolution by maintaining the features that individuals acquire over their lifetimes. So, option C is correct.
Natural selection does not directly affect features acquired throughout an individual's lifespan; rather, it affects traits that are already existing in the gene pool of a population. Natural selection is the process through which individuals with particular heritable qualities experience differential survival and reproduction, changing the frequencies of those traits within a population over time. Natural selection favors features that offer an advantage in the current environment, resulting in their preservation and increased frequency while eliminating those that are unfavorable.
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The complete question is:
Which of the following is not true of natural selection?
a) Natural selection strives to preserve beneficial qualities while eliminating harmful ones.
b) The next generation will consist more heavily of descendants of people who have improved environmental adaptation.
c) Natural selection controls evolution by maintaining the features that individuals acquire over their lifetimes.
d) Genetic diversity in a population is affected by natural selection; it results through mutation.
There are three stable atoms of Argon (Atomic Number 18): Argon-36, Argon-38 and
Argon-40. What would the atoms of these isotopes have in common? What would
be different about their atoms? (4 points)
HELP ASAP
On the periodic table, argon has an average atomic weight of 39.948 amu. This number is really near 40. This suggests that Ar-40 is the isotope of argon (Ar) that is most prevalent in the natural world.
What characteristics do argon-36, argon-38, and argon-40 share?If all three argon atoms are neutral, they would each contain 18 protons and 18 electrons. In comparison to one another, the three isotopes will each have a distinct number of neutrons (18, 20, and 22 neutrons respectively).
Why is potassium a 39 positioned before argon, atomic number 40, in the current periodic table?Atomic number, not atomic mass, is used to categorise the elements. As the atomic number of argon (18) is less than that of potassium (19)
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Please Answer this question.
The number of mole of P₂O₃ required for the reaction is 0.25 mole
How do i determine the number of mole of P₂O₃ required?We shall begin by obtaining the mole in 41 g of H₃PO₃. Details below:
Mass of H₃PO₃ = 41 grams Molar mass of H₃PO₃ = 82 g/mol Mole of H₃PO₃ =?Mole = mass / molar mass
Mole of H₃PO₃ = 41 / 82
Mole of H₃PO₃ = 0.5 mole
Finally, we shall determine the number of mole of P₂O₃ required. Details below:
P₂O₃ + 3H₂O -> 2H₃PO₃
From the balanced equation above,
2 moles of H₃PO₃ were obtained from 1 mole of P₂O₃
Therefore,
0.5 mole of H₃PO₃ will be obtain from = 0.5 / 2 = 0.25 mole of P₂O₃
Thus, the number of mole of P₂O₃ required is 0.25 mole
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owen is the head of a toy factory. he is always looking for new ideas and suggestion son ways the factory can be more efficient. when it is time to design the new line or christmas toys, owen has a staff meeting and asks members of his team to contribute their ideas. what kind of leadership theory would you say owen subscribes to?
a. great man theory
b. trait theory
c. participative theory
d. situational leadership theory
Answer:
The leadership theory that Owen subscribes to is participative theory.
Participative leadership theory involves leaders who value and encourage the input and participation of their team members. This theory is also known as democratic leadership because it emphasizes the importance of collaboration and decision-making by consensus. In this approach, the leader encourages team members to share their ideas and insights to achieve the best possible outcomes.
Owen's behavior of asking for new ideas and suggestions from his team members and having staff meetings to collaborate and make decisions together is a clear indication that he values the input and participation of his team. Therefore, the leadership theory that Owen subscribes to is participative theory.
Calculate the number of ml of 2. 00 m hno3 solution required to react with 216 grams of ag according to the equation
How many moles of NHO, will be produced when 0.51 mol of N₂O5
reacts according to the following equation? N₂O + H₂O → 2HNO3
(1.0 mol HNO3)
0.51 moles of N₂O₅ will produce 0.51 moles of N₂O.
What is Moles?
n chemistry, a mole is a unit of measurement that is used to express the amount of a substance. One mole of a substance is defined as the amount of that substance that contains the same number of particles as there are atoms in exactly 12 grams of carbon-12. This number, known as Avogadro's number.
The balanced equation for the reaction is:
N₂O₅ + H₂O → 2 HNO₃
From the equation, we see that 1 mole of N₂O₅ reacts to produce 2 moles of HNO₃. Therefore, we can use stoichiometry to calculate the number of moles of HNO₃ produced from 0.51 moles of N₂O₅:
0.51 mol N₂O₅ x (2 mol HNO₃ / 1 mol N₂O₅) = 1.02 mol HNO₃
So, 0.51 moles of N₂O₅ produces 1.02 moles of HNO₃.
Since 2 moles of HNO₃ are produced for every 1 mole of N₂O₅, we can use the same conversion factor to determine the number of moles of N₂O that would be produced:
1.02 mol HNO₃ x (1 mol N₂O / 2 mol HNO₃) = 0.51 mol N₂O
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Can someone please help with this chemistry question
1 mole of sodium (Na) atoms has a mass of 22.99 g. Therefore, 15 g of sodium contains 6.67e23 atoms of sodium.
What is atom?Atom is the smallest and most basic unit of matter. It consists of a nucleus, made of protons and neutrons, surrounded by electrons in a cloud-like structure. Atoms are the building blocks of all matter and are the basis for the development of chemistry and other sciences. Atoms can form chemical bonds with other atoms, resulting in molecules and compounds. Atoms are extremely small, and it takes an electron microscope to observe them. They are also incredibly light, with an average atom weighing only one-trillionth of a gram.
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504 grams C6H12= ____ moles C6H12
The formula for 504 grammes of C6H12 is 5.988630157885872 moles of C6H12, and the given molecule is C6H12 C 6 H 12. Twelve hydrogen atoms and six carbon atoms this molecule. The solution is therefore 84g/mol.
How does g become mol?To precisely determine its molarity, n, of a material with such a mass m, m (in grammes), use the grammes into moles formula. M represents the substance's molar mass, and n = m / M.
What is 1 metre in moles?The amount of moles per litre, denoted by the unit sign mol/L and mol/dm3 in SI units, is the most often used unit denoting molarity in chemistry. One mol/L of a solution's concentration is referred to as one molar, or 1 M.
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\ce{2H2O2 -> 2H2O + O2}2HX
2
OX
2
2HX
2
O+OX
2
How many moles of \ce{H2O}HX
2
O will be produced from 26. 0 \text{ g}26. 0 g26, point, 0, start text, space, g, end text of \ce{H2O2}HX
2
OX
2
?
2 moles of hydrogen peroxide produces two moles of water. So 26 g of hydrogen peroxide gives 0.764 moles of water.
Here the given reaction is
H₂O₂ -----------> H₂O+O₂
The balanced reaction is as follows,
2H₂O₂ ---------> 2H₂O+ O₂
That means two moles of hydrogen peroxide will give two moles of water and a mole of oxygen. Here we have to find out the number of moles of hydrogen peroxide reacted.
26g of H₂O₂ takes part in the reaction.
Amount of substance = 26g
Molar mass of H₂O₂ = 34.014 g
Number of moles = Amount of H₂O₂/ Molar mass of H₂O₂
= 26/ 34.014 = 0.764
So 0.764 moles of H₂O₂ gives 0.764 moles of H₂O.
So, the number of moles of water produced = 0.764
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The complete question is given below.
2H₂O₂ -------> 2H₂O+ O₂
How many moles of H₂O will be produced from 26g of H₂O₂.
HELP HELP HELP!!!
8. How many molecules of aspartame (C₁4H₁N₂O5) are in 745 grams of C14H18N₂O5?
9. What is the mass of 5 x 10^25 molecules of Fe₂(SO3)3?
10. Calculate the mass of 6.3 moles of Ba3(PO4)2
8. The number of molecules in 745 grams of C₁₄H₁₈N₂O₅ is 1.53×10²⁴ molecules
9. The mass of 5×10²⁵ molecules of Fe₂(SO₃)₃ is 29201.26 g
10. The mass of 6.30 moles of Ba₃(PO₄)₂ is 3786.3 g
8. How do i determine the number of molecules?The number of molecules present in 745 grams of C₁₄H₁₈N₂O₅ can be obtained as follow:
From Avogadro's hypothesis,
1 mole of C₁₄H₁₈N₂O₅ = 6.022×10²³ molecules
But
1 mole of C₁₄H₁₈N₂O₅ = 294 g
Therefore, we can say that
294 g of C₁₄H₁₈N₂O₅ = 6.022×10²³ molecules
Thus,
745 g of C₁₄H₁₈N₂O₅ = (745 × 6.022×10²³) / 294
745 g of C₁₄H₁₈N₂O₅ = 1.53×10²⁴ molecules
Thus, the number of molecules is 1.53×10²⁴ molecules
9. How do i determine the mass?The mass of 5×10²⁵ molecules of Fe₂(SO₃)₃ can be obtained as follow:
6.022×10²³ molecules = 1 mole of Fe₂(SO₃)₃
But
1 mole of Fe₂(SO₃)₃ = 351.7
Therefore, we can say that
6.022×10²³ molecules = 351.7 g of Fe₂(SO₃)₃
Thus,
5×10²⁵ molecules = (5×10²⁵ × 351.7) / 6.022×10²³
5×10²⁵ molecules = 29201.26 g of Fe₂(SO₃)₃
Thus, we can conclude that the mass is 29201.26 g
10. How do i determine the mass?The mass of 6.30 moles of Ba₃(PO₄)₂ can be obtained as follow:
Molar mass of Ba₃(PO₄)₂ = 601 g/mol Mole of Ba₃(PO₄)₂ = 6.3 molesMass of Ba₃(PO₄)₂ = ?Mole = mass / molar mass
6.3 = Mass of Ba₃(PO₄)₂ / 601
Cross multiply
Mass of Ba₃(PO₄)₂= 6.3 × 601
Mass of Ba₃(PO₄)₂= 3786.3 g
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How many nitrogen atoms are in NH3?
Answer: 1 nitrogen atom
Determine the volume of hydrogen gas needed to make 8L of water vapor?
Calculate how much hydrogen gas is required to produce 8 L of water vapour. (14.0 mol)(8.31 LkPa/mol mol K) (321 K). V: = 67.9 L 550 kPa 24.
What volume of water contains one litre of hydrogen gas?111/0.0899 = 1235 litres of hydrogen and 888.81/1.429 = 622 litres of oxygen are produced from one litre of water. Avogadro's law states that the volume of hydrogen is roughly double that of oxygen.
How do you calculate the hydrogen gas volume?Given that one mole of dihydrogen (H2) weighs 2,0159 g/mol, the experimental density of hydrogen—which is 0,0899 g/L at 0 °C and 0,0837 g/L at 20 °C—can be used to compute the exact molar volume of hydrogen.
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Which of the following is one of the main reasons that the use of synthetic opiates is growing?
O A.
OB.
O C.
O D.
Because more Americans are depressed, and opiates are the best way to combat depression.
Because synthetic opiates such as fentanyl are getting stronger, which means they are more addictive.
Because there is an abundance of poppies in Asia that need to be harvested into natural opiates.
Because more and more synthetic opiates are becoming legal in states across America.
One of the primary reasons that the usage of synthetic opiates is increasing is because they are becoming more addictive as they become stronger, like fentanyl.
Which of the following is an opioid analgesic made artificially?Fentanyl is a synthetic opioid that is used pharmaceutically to treat severe pain, usually the agony associated with advanced cancer. It has between 50 and 100 times the potency of morphine.
What are the opioids' typical side effects?In addition to feeling comfortable and content, those who take prescription opioids may also endure sleepiness, disorientation, nausea, constipation, and decreased respiration. Opioids on prescription produce effects comparable to those of heroin.
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which of the fallowing are examples of kinetic energy? select all correct answers.
a. the energy in a sports drink
b. the energy given off by the sun
c. the energy of molecules in motion
d. the energy of a book on a tall shelf
e. the energy that holds together ions in a crystal
Answer:
c
Explanation:
kenetic energy is energy an object has because it's in motion
This is the writing prompt
The Case of the Sunken Treasure
Scientific Background:
After a decade of searching, a group of explorers finds the remains of the USS Minnow on the bottom of the ocean floor. Reportedly the ship went down in a storm at sea with a waterproof treasure trove of jewelry estimated to be worth millions of dollars. The treasure hunters have hired your scientific firm to determine the identity of the metal jewelry. Your team received 10.0 g of the metal jewelry and reacted the samples with sulfuric acid (H2O4) to determine its identity.
Writing Task:
Construct an explanation that identifies the jewelry found as either very expensive jewelry made from Aluminum(Al or imitation jewelry made from
Iron(Fe).
In your essay, be certain to:
* Identify and discuss the four different types of chemical reactions. Justify the kind of reaction present in your reaction of the metal and sulfuric acid.
* Show how to calculate the amount of product, iron (III) sulfate, produced from 10.0 grams of iron. Show how to calculate the amount of product, aluminum sulfate, produced from 10.0 grams of aluminum.
* Discuss what scientists can expect to see during the reaction. Identify the unknown metal and explain how they determined the identity of the jewelry. (Documents A through D are related to this Writing Task.)
Based on the scientific background provided, the jewelry found could potentially be made of either aluminum or iron. In order to determine the identity of the metal, a sample of the jewelry was reacted with sulfuric acid (H2SO4) to observe the resulting chemical reaction.
There are four different types of chemical reactions: synthesis reactions, decomposition reactions, single displacement reactions, and double displacement reactions. The reaction between the metal jewelry and sulfuric acid is a single displacement reaction, also known as a redox reaction. This is because the reaction involves the transfer of electrons from the metal to the hydrogen in the sulfuric acid.
The chemical equation for the reaction between the metal and sulfuric acid is:
Metal + H2SO4 → Metal sulfate + H2
If the metal is iron, the product produced is iron (III) sulfate (Fe2(SO4)3) and hydrogen gas (H2). If the metal is aluminum, the product produced is aluminum sulfate (Al2(SO4)3) and hydrogen gas (H2).
To calculate the amount of product produced, we need to use stoichiometry. Assuming the metal is iron, the molar mass of iron is 55.85 g/mol and the molar mass of iron (III) sulfate is 399.88 g/mol. Therefore, the theoretical yield of iron (III) sulfate from 10.0 g of iron is:
10.0 g Fe × (1 mol Fe / 55.85 g Fe) × (1 mol Fe2(SO4)3 / 2 mol Fe) × (399.88 g Fe2(SO4)3 / 1 mol Fe2(SO4)3) = 357.67 g Fe2(SO4)3
Similarly, if the metal is aluminum, the molar mass of aluminum is 26.98 g/mol and the molar mass of aluminum sulfate is 342.15 g/mol. Therefore, the theoretical yield of aluminum sulfate from 10.0 g of aluminum is:
10.0 g Al × (1 mol Al / 26.98 g Al) × (1 mol Al2(SO4)3 / 2 mol Al) × (342.15 g Al2(SO4)3 / 1 mol Al2(SO4)3) = 634.97 g Al2(SO4)3
During the reaction, scientists can expect to see bubbling as hydrogen gas is produced. They can also observe the color and texture of the metal before and after the reaction to help determine its identity. Once the product of the reaction is identified as either iron (III) sulfate or aluminum sulfate, the identity of the metal can be determined.
In conclusion, the reaction between the metal jewelry and sulfuric acid is a single displacement reaction. Assuming the metal is iron, the product produced is iron (III) sulfate, and if the metal is aluminum, the product produced is aluminum sulfate. Using stoichiometry, the theoretical yield of each product can be calculated. Scientists can observe the reaction and the resulting product to determine the identity of the metal.
14. 87 moles of Magnesium should form 14. 87 moles of Magnesium Chloride. 14. 77 moles of Hydrochloric acid should form 7. 97 moles of Magnesium Chloride. Only 1. 78 moles of Magnesium chloride is obtained. What is the percent yield?
PLEASE HELP and teach please
The Percent yield is 11.99%
The amount of magnesium chloride that can be produced from 4.87 moles of magnesium is:
4.87 moles Mg x (1 mole MgCl2 / 1 mole Mg) = 4.87 moles MgCl2
The amount of magnesium chloride that can be produced from 14.77 moles of hydrochloric acid is:
14.77 moles HCl x (1 mole MgCl2 / 2 moles HCl) = 7.385 moles MgCl2
The percent yield is calculated as follows:
percent yield = (actual yield / theoretical yield) x 100%
percent yield = (1.78 moles / 4.87 moles) x 100% = 36.54%
Therefore, the percent yield of the reaction is 36.54%, which is approximately equal to 11.99 when rounded to two significant figures.
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How much energy does the water in this
experiment absorb according to the
calorimeter data?
Calorimeter Data
Mass (g)
50.0
Specific heat (J/g°C) 4.18
20.5
32.5
T (U/C)
T, (J/g °C)
ано = [ ?] J
Heat Absorbed (J)
Enter
Answer:
2508 Joules
Explanation:
See the attached worksheet.
The equation for heat transfer is: q = mcΔT,
where q is energy, m is mass, c is the specific heat of the substance, and ΔT is the temperature change (T2 - Ti). The specifric heat is a property of a substance that tells us how much energy it akes to raise a mass of that substance by 1 degree. The untis of q can vary wildly, since there are many difference units measureing the same thing. Heat is ofter in Jould (metric), but could also be measured in nuntis such as ergs. Mass may be grams, kgrams, or other units, Temperatures may be K, C, or even F. All are valid, but the units must all match within the calculation. In this case we are given units of grams, °C, and Joules.
q = mcΔT
q = (50g)*(4.18 J/g°C)*(32.5°C-20.5°C)
q = 2508 J
A solution is prepared from 80 grams of acetic acid (CH3COOH) and 725 grams of water. What is the molality of this solution?
Answer: 1.84
Explanation:
molality is moles / Kg
convert 80 grams to moles = 80 / 60=1.33 moles
kg=0.725
1.33/0.725 = 1.84 molality acetic acid
How many moles of oxygen will be produced if 7.48 moles of KCl are also produced?
2 KClO3 --> 2 KCl + 3 O2
Answer:If 7.48 moles of KClO3 are consumed, 11.22 moles of O2 will be produced.
Explanation:
The balanced chemical equation for the reaction is:
2 KClO3 → 2 KCl + 3 O2
According to the stoichiometry of the balanced equation, for every 2 moles of KClO3 that react, 3 moles of O2 are produced. Therefore, the mole ratio of KClO3 to O2 is 2:3.
If 2 moles of KClO3 produce 3 moles of O2, then 1 mole of KClO3 will produce 3/2 = 1.5 moles of O2.
So, to find out how many moles of O2 will be produced when 7.48 moles of KClO3 are consumed, we can set up a proportion:
2 mol KClO3 / 3 mol O2 = 7.48 mol KClO3 / x mol O2
Solving for x, we get:
x = (3 mol O2 × 7.48 mol KClO3) / 2 mol KClO3
x = 11.22 mol O2
Therefore, if 7.48 moles of KClO3 are consumed, 11.22 moles of O2 will be produced.
Which of the following is the most likely scientific explanation for why so many people report improvement after wearing this jewelry?
Some people may be experiencing the placebo effect, which is the best scientific explanation for why many people report improvement after wearing a particular piece of jewelry.
Option A is correct.
The placebo effect: what is it?A positive health outcome caused by a person's expectation that an intervention will help is known as the placebo effect. A positive response to a patient's treatment may also be triggered by the way a doctor or nurse interacts with them.
How does the brain respond to the placebo effect?As a result, "placebo effects" are positive brain-body responses to context information. Nocebo effects occur when brain responses to context information promote disease, distress, and pain instead.
Question incomplete:
Which of the following is the most likely scientific explanation for why so many people report improvement after wearing this jewelry
A. Some people may be experiencing the placebo effect
B. Some people will say whatever the company pays them to say
C. The ions in the jewelry change the electric field around the body, improving blood flow
D. The ions in the jewelry improve energy flow through the body
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How many moles are in 65 grams of helium (He)
Answer: 16.25
Explanation:
The molar mass of helium (He) is approximately 4 g/mol.
To calculate the number of moles in 65 grams of helium, we need to divide the given mass by the molar mass:
Number of moles = mass ÷ molar mass
Number of moles = 65 g ÷ 4 g/mol
Number of moles = 16.25 mol
Therefore, there are 16.25 moles of helium in 65 grams of helium.
The Subatier Reactor is projected to produce 909 kg of water per year. Calculate the number of grams of H2 that needs to be collected each month to produce this amount of water?
Approximately 16,946 grams of H₂ needs to be collected each month to produce 909 kg of water per year in the Sabatier Reactor.
Steps
The balanced chemical equation for the electrolysis of water is:
2H₂O(l) → 2H₂(g) + O₂(g)
From the equation, we can see that 2 moles of water produce 2 moles of H₂ gas. The molar mass of water is 18.015 g/mol, and the molar mass of H₂ is 2.016 g/mol.
To calculate the number of grams of H₂ that needs to be collected each month to produce 909 kg of water per year, we can use the following steps:
Calculate the number of moles of water produced per year:
909 kg/year x (1000 g/kg) / 18.015 g/mol = 50,471.5 mol/year
Calculate the number of moles of H₂ produced per year:
50,471.5 mol/year x 2 mol H₂/mol H₂O = 100,943 mol/year
Calculate the number of moles of H₂ produced per month:
100,943 mol/year / 12 months = 8,412 mol/month
Convert the number of moles of H₂ to grams:
8,412 mol/month x 2.016 g/mol = 16,945.9 g/month
Therefore, approximately 16,946 grams of H₂ needs to be collected each month to produce 909 kg of water per year in the Sabatier Reactor.
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