How many grams of C are there in 0.234 moles of caffeine?
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Solo lo ago para obtener puntos jejeje
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which of the following statements correctly describe protecting groups? select all statements that apply. multiple select question. a reactive functional group is converted into another functional group that does not interfere with the desired reaction. when the oh group of an alcohol is reacted with tbdmscl/imidazole the resulting tbdms ether is known as a protecting group. protecting groups must be easily removed (deprotection) to regenerate the original functional group.
Answers
The statements correctly describe protecting groups are :
"A reactive functional group converted to another functional group and it will not interfere desired reaction."
"The Protecting group easily removed (deprotection) to the regenerate original functional group."
The protecting group are the molecular formula that will be introduced the specific functional group and which is present in the poly-functional molecule and the protecting group block the reactivity under the some reaction conditions and which is needed to make the modifications in molecule.
The protecting group readily and the protecting group is selectively introduced to functional group in poly-functional molecule. Protecting group is capable of the selectively removed in under some of the mild conditions when protection is no more longer required.
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which of the following below is an example of a chemical change?
a) heated metal glows red
b) pennies turn green overtime
c) butane is distilled from crude oil
d) soy sauce makes white rice turn brown
Answers
answer: (c) butane is distilled from crude oil
Explanation:
this is the answer because a chemical change is when the formula or what’s inside of it changes ( not what it looks like) so when the butane is token out of the crude oil it changes the formula
kinetic or potential energy.
Answers
Answer:
Potential energy is the energy in a body due to its position. While kinetic energy is the energy in a body due to its motion.
Suppose you wanted to calculate the heat of reaction for the formation of ammonia gas and hydrochloric acid from solid ammonium chloride. Write a balanced equation for this reaction
Answers
Answer:
NH4Cl (s) → NH3 (g) + HCl (aq)
what acts as the refrigerant in a thermoelectric refrigeration system
Answers
The refrigerant used in a thermoelectric refrigeration system is typically a semiconductor material, such as bismuth telluride (Bi₂Te₃).
In a thermoelectric refrigeration system, the principle of the Peltier effect is utilized to achieve cooling. The Peltier effect is based on the thermoelectric effect, which involves the conversion of electrical energy into a temperature difference.
Semiconductor materials, like bismuth telluride (Bi₂Te₃), possess unique properties that make them suitable for thermoelectric cooling. When an electric current is passed through a junction of two dissimilar semiconductor materials, one side of the junction gets heated while the other side gets cooled. This temperature gradient allows for heat to be transferred from one side of the junction (the cool side) to the other side (the hot side), resulting in cooling.
In a thermoelectric refrigeration system, multiple such junctions are typically arranged in a thermoelectric module. The semiconductor material, such as bismuth telluride, acts as the refrigerant by undergoing the heating and cooling cycles, enabling the transfer of heat and achieving the desired cooling effect.
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Which of the following questions cannot be answered by science? How does color of light affect the mating behaviors of bees? How does soil pH affect the productivity of fruit trees? How does temperature affect the amount of oxygen able to dissolve in water? How do contrasting colors affect the quality of a painting?
Answers
Answer: How do contrasting colors affect the quality of a painting
Answer:
The answer is D.
Explanation:
I just took the test. :)
which particles in the nuclei are used to arrange the elements
Answers
The particles used to arrange the elements in the nuclei are protons and neutrons.
These subatomic particles hold the power to define the atomic number and atomic mass of the element, and thus, play a decisive role in determining the identity and stability of an atom.
The intricate arrangement of protons and neutrons within the nucleus holds the key to unlocking the secrets of the element's properties, behavior, and place in the periodic table of elements.
The unique arrangement of these particles within the nucleus of an atom is what gives each element its unique chemical and physical properties.
These particles, central to the atomic structure, hold immense significance in our understanding of the atomic world.
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Identify all resonance forms of the enolate formed, and indicate whether or not a substantial amount of starting ketone will be present together with the enolate at equilibrium. (select all that apply)
Answers
At equilibrium, a significant quantity of starting ketone will be present with the enolate in the first case.
What is ketone?Ketones are substances produced by the liver. It is formed when there is insufficient insulin in the body to turn sugar into energy.
What happens in scenario two where the formation of possible enolate ions from the cyclohexan-1, 4-di.ketone by abstraction of acidic proton by suing sodium ethoxide base occurs?In this case a substantial amount of ketone will exist along side the enolate at equilibrium.
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How many elements are found in 2CuSO4?
A.5
B.4
C.2
D.3
Answers
Answer:
d
Explanation:
the reason is you have Cu S and O
Balance the following chemical equation by using System of equations Nag Pou + Ba(NO₂), ) Bag(Poes)₂ + NaNo₂
Answers
To balance the chemical equation: NaPO3 + Ba(NO2)2 → Ba(PO3)2 + NaNO2. substituting a = c into the third equation: a = c From the fourth equation, we have: 3a = 2c + 2a 3a = 2a + 2a a = 0.
We can set up a system of equations based on the number of atoms of each element on both sides of the equation. Let's denote the coefficients of the balanced equation as follows:
NaPO3: a
Ba(NO2)2: b
Ba(PO3)2: c
NaNO2: d
Now, we can write the system of equations:
Na: a = d
Ba: b = c
P: a = c
O: 3a = 2c + 2d
N: 2b = d
Solving this system of equations will give us the balanced coefficients. From the first equation, we can substitute d = a into the fifth equation:2b = a Substituting this back into the second equation: b = c Now, substituting a = c into the third equation: a = c From the fourth equation, we have: 3a = 2c + 2a 3a = 2a + 2a a = 0
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Ostriches are mostly active during the day, so they should be classified as__________.
A)
crepuscular
B)
perennial
C)
diurnal
D)
nocturnal
E)
biurnal
Answers
Answer:
C
Explanation:
ostriches are classified as diurnal
Answer: The answer is diurnal!
Explanation: Nocturnal animals, such as the owl or bat, stay awake during the night and sleep during the day! Which for diurnal animals, they sleep during the night, and roam around during the day! Such as us humans are both because some people may work during the night and sleep during the day! The most common for humans is us sleeping at night though and awake during the day!
A strong acid is one that
a Doesn’t easily dissociate into ions when I’m solution
B is very dilute in the solution
C easily dissociates into ions when I’m solution
d is very concentrated in the solution
Answers
Answer:
C. easily dissociates into ions when I’m solution
Explanation:
Strong acids are compounds that completely decompose when dissolved in water and produce the total number of ions.
What are the basic component of the Environment
Answers
Explanation:
COMPONENTS OF ENVIRONMENT
Environment mainly consists of atmosphere, hydrosphere, lithosphere and biosphere. But it can be roughly divided into two types such as (a) Micro environment and (b) Macro environment. (a) Micro environment refers to the immediate local surrounding of the organism.
Answer:
The basic component of the Environment are water,forest,living beings,e.t.c
lewis electron dot symbol of Ag⁴⁷
Answers
Answer:
Ag one dot
Explanation:
i hope it helps you
How does cellular respiration result in a net transfer of energy? question 4 options: energy stored in chemical bonds are broken and the energy released is converted into atp (usable cell energy). energy in the form of light is converted into glucose. energy is not gained during cellular respiration, rather it is lost.
Answers
energy stored in chemical bonds are broken and the energy released is converted into atp (usable cell energy). during cellular respiration that result in a net transfer of energy.
Usable ATP energy is produced during cellular respiration and is utilized to sustain several other bodily functions. For energetically unfavourable processes that would not ordinarily take place without an energy input, ATP is particularly crucial.
The Krebs cycle, glycolysis, and the electron transport chain, where oxidative phosphorylation takes place, are the three primary stages of cellular respiration. While glycolysis may take place in anaerobic environments, the TCA cycle and oxidative phosphorylation need oxygen to function. Each cell in the body undergoes cellular respiration in the cytoplasm and mitochondria. The TCA cycle takes place inside the matrix of the mitochondria, whereas glycolysis happens in the cytoplasm.
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A carboxylic acid reacts with water to form a carboxylate ion and H3O+. Complete the reaction
Answers
The carboxylate ion formed is (CH3)2CHCH2COO^- and H3O+.
What is carboxylate ion?
The carboxylate ion is the conjugate base of carboxylic acid with the group RCOO-. This can be formed by adding a base to carboxylic acid where it is deprotonated to give carboxylate anion. It contains a single negative charge because of the absence of H+.
The reaction of carboxylate ion formation can be written as,
(CH3)2CHCH2COOH + H2O -------> (CH3)2CHCH2COO- + H3O+
Here the proton of the carboxylic acid is taken by water and water acts as a base. Then the water forms hydronium ion and carboxylic acid forms carboxylate ion.
Therefore, the carboxylate ion formed by the reaction of (CH3)2CHCH2COOH with water is (CH3)2CHCH2COO- ion having IUPAC name 3-methylbutanoate.
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baking soda and vinegar lab demo part 2 mass! 7th grade please help!
Answers
Answer:
just watch the video, what does it start with, write that down for each trial, then what does it end with, then starting mass - ending mass is the change mass
For the following reaction:
N₂(g) + 3H₂(g) → 2NH₃(g)
Identify the compositions which will produce same amount of NH₃
(a) 140 gm N₂ & 35 g H₂
(b) 18 g H₂ & 52 g N₂
(c) Total 20 moles of mixture having N₂ and H₂ present in stoichiometric ratio (No limiting reagent)
(d) 136 gm of mixture having mass fraction of H₂ = 6/34
Answer is option (a) and option (c), can someone please explain verifying ALL the options? Will mark you as the brainliest!
Answers
Okay, let's go through each option step-by-step:
(a) 140 gm N2 & 35 g H2
since the stoichiometry is 2NH3 : 3H2 : N2, for every 2 moles of NH3 produced, 3 moles of H2 and 1 mole of N2 react.
So, 140 gm N2 = 10 moles N2
35 gm H2 = 3 moles H2
Together they can produce 10/2 = 5 moles NH3. So this option produces the same amount of NH3.
(b) 18 g H2 & 52 g N2
H2 has 3 moles per 35 g so 18 g H2 = 2 moles H2
52 g N2 = 4 moles N2
Producing 2 * (2/3) = 4/3 = 2 moles NH3. This is less than options a and c.
(c) Total 20 moles of mixture having N2 and H2 in stoichiometric ratio.
With 20 moles total and in stoichiometric ratio, the moles of each will produce 2 moles of NH3. So this option also produces the same.
(d) 136 gm of mixture having mass fraction of H2 = 6/34
* Total mass = 136 g
* Mass fraction of H2 = 6/34 = 0.18
* So mass of H2 = 0.18 * 136 = 24 g
* Mass of 24 g H2 = 2 moles H2
* Remaining mass = 136 - 24 = 112 g is N2
* 112 g N2 = 8 moles N2
* Together 2 moles H2 and 8 moles N2 can produce 2 * (2/3) = 4/3 = 2 moles NH3.
This is less, so this option does not produce the same amount.
In summary, options a and c satisfy the criteria of producing the same amount (i.e. 5 moles) of NH3.
Let me know if this helps explain the problem! I can provide more details if needed.
(a) 140 g N₂ & 35 g H₂:
Moles of N₂ = 140 g / 28 g/mol = 5 mol
Moles of H₂ = 35 g / 2 g/mol = 17.5 mol
Limiting reactant: N₂
Moles of NH₃ produced = 5 mol N₂ × (2 mol NH₃/1 mol N₂) = 10 mol NH₃
(b) 52 g N₂ & 18 g H₂:
Moles of N₂ = 52 g / 28 g/mol = 1.857 mol
Moles of H₂ = 18 g / 2 g/mol = 9 mol
Limiting reactant: N₂
Moles of NH₃ produced = 1.857 mol N₂ × (2 mol NH₃/1 mol N₂) = 3.714 mol NH₃
(c) Total 20 moles of mixture having N₂ and H₂ present in stoichiometric ratio (No limiting reagent) :
Moles of N₂ = 20 mol × (1 mol N₂/3 mol H₂) = 6.67 mol
Moles of H₂ = 20 mol × (3 mol H₂/3 mol H₂) = 20 mol
Limiting reactant: N₂
Moles of NH₃ produced = 6.67 mol N₂ × (2 mol NH₃/1 mol N₂) = 13.34 mol NH₃
(d) 136 gm of mixture having mass fraction of H₂ = 6/34:
Let the mass of N₂ be x, then the mass of H₂ will be (136 - x) g.
Mass fraction of H₂ = mass of H₂/total mass
6/34 = ((136 - x)/2) / 136
x = 34 g
Mass of N₂ = 136 - 34 = 102 g
Moles of N₂ = 102 g / 28 g/mol = 3.64 mol
Moles of H₂ = 34 g / 2 g/mol = 17 mol
Limiting reactant: N₂
Moles of NH₃ produced = 3.64 mol N₂ × (2 mol NH₃/1 mol N₂) = 7.28 mol NH₃
Option (a) will produce the same amount of NH₃ as option (c) because both options have the same number of moles of N₂ and H₂ in the stoichiometric ratio. They are not limiting reagents, and the amount of NH₃ produced will be based on the moles of N₂.
Hope this helped!
In a reaction, 42.6 g of chromium(iii) oxide reacts with 15.1 g of aluminum to produce chromium and aluminum oxide. if 29.1 g of chromium is produced, what mass of aluminum oxide is produced?
Answers
42.6 g of chromium(iii) oxide reacts with 15.1 g of aluminum to produce chromium and aluminum oxide. if 29.1 g of chromium is produced, then the mass of aluminum oxide is produced 14.6 g,
Here's how,
Cr2O3 + 2Al ⇄ Al2O3 + 2Cr.....(1) (take this equation 1)
∴ In the above chemical reaction, Aluminum oxide is produced,
Given, Mass of Chromium(iii) oxide = 42.6 g,
Mass of Aluminum = 15.1 g, and
Mass of Chromium = 29.1 g,
Hence, we have to find oxygen, before finding the mass of aluminum oxide.
∵ Mass of Cr2O3 = 42.6 g,
⇒ (29.1 × 2)+(O3) = 42.6
⇒ 58.2 + O3 = 42.6
⇒ O3 = 42.6 - 58.2 ⇒ - 15.6 g
Put O3 in equation (1), we get,
Now, put the atomic mass of O in equation 1, we get,
∴ Al2O3 ⇒ [(29.1 × 2) + {(-5.2) × 3}]
⇒ 14.6 g
Therefore, the Mass of Aluminum Oxide produced is 14.6 g.
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for the reaction and at 276 k and 1 atm. this reaction is reactant favored under standard conditions at 276 k. the entropy change for the reaction of 1.93 moles of at this temperature would be
Answers
The Kelvin scale temperature. As a result, at 411 K, the reaction's entropy change equals the surroundings' entropy change.
What is a chemistry example of temperature?Temperature has an indicator of the mean kinetic energy in the system's atoms or molecules. Water particles in a cup in hot coffee contain a higher average velocity than water molecules in to cup of chilled tea, which means they move faster.
In chemistry, how is temperature measured?The Celsius or Kelvin scales are employed. Temperatures are measured in laboratories using Celsius thermometers. The previously Celsius measurements are changed to Kelvin for some calculations. That kelvin is the SI unit about temperature.
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g the free energy associated with the proton gradient that develops across the inner mitochondrial membrane as a result of the electron transport chain is 23.3 kj per mole of protons. if fadh2 is the only electron donor to the electron transport chain, how many moles of fadh2 would be required to produce a proton gradient in which exactly one mole of protons have been pumped across the membrane, assuming we start with no gradient? the standard reduction potential of fadh2 is 0.10 v, and that of o2 is 0.81 v. select the closest value from the options below. a) 3 mol fadh2 d) 0.17 mol fadh2 b) 1 mol fadh2 e) 5.8 mol fadh2 c) 0.5 mol fadh2
Answers
The number of moles of FADH₂ required to produce a proton gradient is 0.17 mol. This can be calculated through the free energy and potential difference. Thus, the correct option is D.
What is the required number of moles of FADH₂?
There are 6.022 × 10²³ protons per mole of H⁺. Therefore, one mole of H⁺ contains 1 mole of protons.
The change in potential between FADH₂ and O₂ is: ΔE°' = E°'(O₂) - E°'(FADH₂)
ΔE°' = 0.81 - 0.10
ΔE°' = 0.71 V
ΔG for electron transfer from FADH₂ to O₂ is: ΔG°' = -nFΔE°'
where, n = number of electrons, F = Faraday's constant (96,500 J/V), and ΔE°' is the change in potential between the two half-cells.
We know that n = 2 (since FADH₂ transfers two electrons to O₂).
ΔG°' = -2 × (96,500) × (0.71)
ΔG°' = -137,860 J/mol
ΔG° = -nFΔΨ
where, n = number of protons, F = Faraday's constant (96,500 J/V), and ΔΨ is the change in potential across the membrane. We know that n = 1 (since we want to pump one mole of H⁺ across the membrane).
ΔΨ = ΔG°/(nF)
ΔΨ = (-137,860)/(1 × 96,500)
ΔΨ = -1.43 V
ΔG = ΔG° + RTlnQ
where, R = gas constant (8.31 J/molK), T = temperature in Kelvin (298 K), and Q = reaction quotient.
Since the reaction is at standard conditions, Q = 1 (since all the reactants and products are in their standard states).
ΔG = ΔG°
ΔG = -137,860 J/mol
ΔG = -137.86 kJ/mol
23.3 kJ/mol = n × (1.43 V)
n = 0.17
Therefore, 0.17 mol of FADH₂ is required.
Therefore, the correct option is D.
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How many moles are in 25 grams of nitrogen trihydride?
Answers
Explanation:
molecules NH3 = 1.47 moles x 6.02x1023 molecules/mole = 8.9x1023 molecules of NH3 (to 2 sig. figs.)
Which chemical group is most likely to be responsible for an organic molecule behaving as a base? (a) hydroxyl (c) amino (b) carbonyl (d) phosphate
Answers
The chemical group which is most likely to be responsible for an orgainc molecule behaving as a base is Amino group.
Amines are the nitrogen containing organic bases. Simple organic molecules such as methylamine, H₃N-CH₃, and ethylamine, H₃N-CH₂CH₃ are the bronsted bases.
Functional group is a group of atoms in molecule which have the different and separate chemical properties. It provide certain characteristics to the molecule. The functional group gets attached to the carbon atom.
Functional groups can behave as a base or an acid. It relies in their structure's ability to accept or to donate the H⁺ ions.
Amino group is represented as :
R \ NH₂ . .Amino group has ability to accept the H⁺ ions from the solution, it forms NH₃⁺.
--NH₂ + H⁺ → NH₃⁺
Therefore, Amino group is most likely to be responsible for an organic molecule behaving as a base.
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compare and contrast the bohr model with our current quantum model of the atom. what are some similarities and differences?
Answers
The quantum model is regarded as the most current model to explain the composition of an atom. The Bohr model and the quantum model are fundamentally different in that the former explains the particle behavior of an electron while the latter explains its dual nature as a wave and a particle.
What is the Bohr Model?The Bohr model of the atom was put forth by Neil Bohr in 1915. It was developed by altering Rutherford's atomic model. Rutherford demonstrated how a positively charged nucleus is surrounded by negatively charged electrons in his nuclear model of an atom.
The Bohr hypothesis modified the atomic structure model by explaining that electrons move in fixed orbitals (shells) and not anywhere in between. He also demonstrated the fixed energy of each orbit (shell). Bohr added electrons and their many energy levels to Rutherford's revised concept of the atom's nucleus.
In Bohr's theory, there is a tiny, positively charged nucleus that is surrounded by negatively charged electrons that orbit the nucleus. According to Bohr, an electron that is farther from the nucleus has more energy than an electron that is closer to the nucleus.
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12. Aditya is stacking some cups. The diagram above shows the cups before they touch each other. Use the information in the diagram to answer the question.
After the cups have been touching for a while, which of the two bottom cups will be cooler, and why?
Answers
Answer:
please give more clarification
which of the following statements are true? select all that apply. which of the following statements are true?select all that apply. the larger the atom, the more polarizable it is. in terms of the total attractive forces for a given substance, the contribution of dipole-dipole interactions, when present, are always larger than the contributions of dispersion forces. all other factors being the same, dispersion forces between linear molecules are greater than dispersion forces between molecules whose shapes are nearly spherical. when comparing ne and xe , the boiling point of ne is expected to be higher because dispersion forces decrease going down a column in the periodic table. for molecules with similar molecular weights, the dispersion forces become stronger as the molecules become more polarizable
Answers
The true statements are 1, 3, 4 and 5 for the properties of atom and molecules.
Define the term chemical bond?Atoms in molecules are held together by chemical bonds. Electrostatic forces between negatively charged electrons and positive charge atomic nuclei give rise to bonds.1. The statement is true:
Generally speaking, polarizability increases as electron volume increases. This happens in atoms because larger atoms have less firmly bound electrons compared to smaller atoms, which have more loosely held electrons. More polarizable than smaller atoms are larger molecules, atoms, or ions.2. The statement is false.
As we go down the group, the dispersion forces increases and they can be stronger than any other interactions.3. The statement is true.
In comparison to molecules with a linear shape, spherical molecules have less surface area and a lower dispersion force.4. The statement is true.
As the polarizable size of the molecules increases down the group, the boiling points also increase. As you move down the column of noble gases, their increasing diameters and resulting greater and greater London dispersion forces are apparent. The boiling point is set by these intermolecular interactions. The easier it is to separate the atoms, the smaller the force.5. The statement is true.
The dispersion forces get stronger when polarizability increases. As a result, molecules are more attracted to one another, and the melting and boiling points of covalent compounds increase with increasing molecular mass. Through the affected molecules' impacted molecules' molecular shapes, polarizability also affects dispersion forces.To learn more about chemical bonds visit:
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What are the two types of taxes that working individuals pay on their earnings?
(1) individual income tax and sales tax
(2) payroll tax and sales tax
(3) individual income tax and social insurance taxes
(4) property tax and payroll tax
(5) sales tax and income tax
Answers
There are actually two types of taxes that working individuals pay on their earnings. The first one is individual income tax, which is a tax levied on the income of individuals or households.
The second one is social insurance taxes, which are taxes collected to fund social security and Medicare programs. Therefore, the correct answer to this question would be (3) individual income tax and social insurance taxes. Sales tax and income tax are not necessarily paid by working individuals on their earnings, so option (5) is not correct.
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The process of forming a simple metal-nonmetal salt can be broken into five steps. Which of these steps have an associated energy change that must be positive?
A. Ionization of metal atoms
B. Nonmetal electron affinity
C. Sublimation of the metal
D. Bond breaking in elemental nonmetals
E. Lattice energy
Answers
Lattice energy must have a positive energy change. Option E is correct choice.
Lattice energy is the energy required to separate one mole of a solid ionic compound into its constituent ions in the gas phase. This process requires energy as the positively charged metal ions and negatively charged nonmetal ions are attracted to each other in the solid lattice structure.
The energy required to break these attractive forces and separate the ions is called the lattice energy. Since this process requires energy, the lattice energy change must be positive. Therefore, option e is correct answer.
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Which set of reactants creates these products
during a double replacement reaction?
[?] → H₂O(1) + NaF (aq)
Remember that each formula must have a balanced charge.
A. HF (aq) + 2NaOH(aq)
B. HF (aq) + NaOH(aq)
C. NaH (aq) + FOH (aq)
D. 2HF (aq) + NaOH(aq)
Answers
Answer:
B. is the answer
Explanation:
(A) (B) + (C) (D) (AD) +(CB)
(H) (F) + (Na) (OH) --> H2O+NaF
(OH) counts as one because it's a polyatomic ion.
How many copper atoms does it contain? [The volume of a sphere is (4/3)πr3 and the density of copper is 8.96 g/cm3 .]
Answers
Number of copper atoms ≈ 3.013 x 10²³ atoms
To determine the number of copper atoms in a given volume, we need to follow these steps:
Determine the mass of the copper sample:
Mass = Volume x Density
Given that the density of copper is 8.96 g/cm³, we can assume the volume as 1 cm³ for simplicity.
Mass = 1 cm³ x 8.96 g/cm³ = 8.96 g
Calculate the number of moles of copper using the molar mass of copper:
Molar mass of copper (Cu) = 63.55 g/mol
Moles of copper = Mass / Molar mass
Moles of copper = 8.96 g / 63.55 g/mol
Determine the number of copper atoms using Avogadro's number:
Avogadro's number (NA) = 6.022 x 10²³ atoms/mol
Number of copper atoms = Moles of copper x NA
Number of copper atoms = [(4/3)π cm³ x 8.96 g/cm³] / 63.55 g/mol x (6.022 x 10²³ atoms/mol)
By substituting the values and performing the calculations:
Number of copper atoms ≈ 3.013 x 10²³ atoms
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