The most efficient synthesis of 1-bromo-2-methylcyclohexane is achieved using hydrogen bromide (HBr) and heat.
Which reagents and conditions yield the most efficient synthesis of 1-bromo-2-methylcyclohexane?In the synthesis of 1-bromo-2-methylcyclohexane, the most efficient approach involves the use of hydrogen bromide (HBr) and heat.
This method follows an addition reaction mechanism, where HBr adds across the double bond of 1-methylcyclohexene, resulting in the formation of 1-bromo-2-methylcyclohexane.
The addition of HBr occurs due to the high electrophilic character of the bromine atom, which is attracted to the electron-rich double bond. Heat is applied to facilitate the reaction and promote the formation of the desired product. The resulting 1-bromo-2-methylcyclohexane can be isolated through appropriate purification techniques.
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below shows the dimensions of two colored cubes.
Dimensions of Cubes
Cube Side (cm) Mass (g)
Red: 4 12
Green: 3 10
Which cube is denser?
Red, because it has more volume and more amount of matter
Green, because it has less volume and less amount of matter.
Red, because it has less volume and more amount of matter
Green, because it has less volume and more amount of matter.
Green, because it has less volume and less amount of matter.
What is density?Density is the mass of a material substance per unit volume. d = M/V, where d is density, M is mass, and V is volume, is the formula for density. Grams per cubic centimeter are a typical unit of measurement for density.
Because it enables us to predict which compounds will float and which will sink in a liquid, density is a crucial notion. If an object's density is lower than the liquid's, it will often float.
The dimensions of two colored cubes.
Red: 4 12
Green: 3 10
density = mass/volume
so compare
[tex]12/4^{3}[/tex] and [tex]10/3^{3}[/tex]
None of the choices is the real reason. But is the closest. It is green because 10/27 > 12/64
But red would have been denser for a side of 3.9, and green would still have had less volume and less matter.
Green, because it has less volume and less amount of matter.
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Ammonium hydrogen sulfide (NH4HS) can decompose to ammonia and hydrogen sulfide: What is the equilibrium constant expression for this system
The equilibrium constant expression for this system is Keq=[NH3][H2S]
What is the the equilibrium constant expression of the system?The ratio of the equilibrium concentrations of the products to the concentrations of the reactants raised to their respective powers to match the coefficients in the equilibrium equation is K for a system in equilibrium, according to the law of mass action. The equilibrium constant expression is known as the ratio.
Therefore, the equilibrium constant expression for this system is Keq=[NH3][H2S]
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Suppose you need 0.12L of a 0.13M solution of NiCl2, but all you have is a solution that is a solution that is 0.23M. What volume of the solution do you need to dilute
- 0.05 L needs to be added to the original 0.12 L solution in order to dilute it from 0.13 M to 0.23 M.
The dilution problem uses the equation :
[tex]M_aV_a= M_bV_b[/tex]
The initial molarity (concentration) [tex]M_a =[/tex] 0.13 M
The initial volume [tex]V_a[/tex] = 0.12 L
The desired molarity (concentration) [tex]M_b[/tex] = 0.23 M
The volume of the desired solution [tex]V_b[/tex] = ( 0.12 + x L )
Substituting values in above equation;
(0.13 M ) (0.12 L) = (0.23 M ) (0.12 L + x L)
0.0156 M L = 0.0276 M L + 0.23 x M L
- 0.012 M L = 0.23 x M L
x = - 0.05
Therefore, - 0.05 L needs to be added to the original 0.12 L solution in order to dilute it from 0.13 M to 0.23 M.
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According to boyle's law, the pressure of a gas increases as the volume decreases because:
Answer:
according to the law,the pressure would increase if volume has been decreased.
Explanation:
the reason is that,pressure and volume are inversely proportional,if volume has been decreased that means the pressure would increase because decreased volume would create a sort of compacted situation for particles either of a liquid or gas,decreasing volume would bring these particle together, closer to each other because of decreased and since the volume has decreased they dont have enough space,they would end up getting closer to each other most likely to collide, which drastically increase pressure .
A sample of a compound is determined to have 1.17 g of carbon and 0.287 g of hydrogen. what is the correct representation of the empirical formula for the compound?
CH3 is the empirical formula for the compound.
A sample of a compound is determined to have 1.17g of Carbon and 0.287 g of hydrogen.
The number of atom or moles in the compound is
1.17 g C X 1 mol of C / 12.011 g C = 0.097411 mol of C.
0.287 g H x 1 mol of H / 1 g H = 0.28474 mol H.
This compound contains 0.097411 mol of carbon and 0.28474 mol of Hydrogen.
So we can represent the compound with the formula C0.974H0.284.
Subscripts in formulas can be made into whole numbers by multiplying the smaller subscript by the larger subscript.
we can divide 0.284 by 0.0974.
0.284 / 0.0974 = 3.
So here, Carbon is one and hydrogen is 3.
We can write the above formula as a CH3.
Hence the empirical formula for the sample compound is CH3.
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A 684.6 mL sample of carbon dioxide was heated to 387 K. If the volume of the carbon dioxide sample at 387 K is 933.9 mL, what was its temperature at 684.6 mL
According to Charle's law equation, the volume of a sample of carbon dioxide will be 684.6 mL and the temperature will be 283.60 K.
Charle's law equationAccording to Charles' Law, the volume of a gas container with a certain amount of gas within is precisely proportional to the temperature when the pressure is constant.
Calculation:[tex]V_{1}[/tex] = 684.6 mL
[tex]V_{2}[/tex] = 933.9 mL
[tex]T_{1}[/tex] = ?
[tex]T_{2}[/tex] = 387 K
Using Charle's law equation
[tex]\frac{684.6}{T_{1} } = \frac{933.9}{387}[/tex]
[tex]T_{1} = \frac{2,64,862.8}{933.9}[/tex]
[tex]T_{1} = 283.60 K[/tex]
According to Charle's law equation, the temperature at 684.6 mL volume was 283.60 K.
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Which amino acid and which atom has most to do with myoglobin’s ability to bind o2?.
The amino acid and which atom which has most to do with myoglobin’s ability to bind o2 is histidine and haemoglobin respectively
What is amino acid?Amino acids simply refers to those molecular substances which combine together to form proteins. However, they are the end products of protein digestion
So therefore, the amino acid and which atom which has most to do with myoglobin’s ability to bind o2 is histidine and haemoglobin respectively
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The composition of a given pure compound is always no matter what the source of the compound?
The composition of a given pure compound is always the same no matter what the source of the compound.
A compound seems to be a substance that is entirely made of one kind of molecule.
Every component of compounds shares the same traits and features because of their homogenous makeup. However, because mixtures are composed of several sorts of chemicals, they frequently differ in terms of content, qualities, and samples.
Therefore, the composition of a given pure compound is always the same no matter what the source of the compound.
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Which way does heat flow?
In the reaction catalyzed by the pyruvate dehydrogenase complex, the two carbons constituting the acetyl group are
Transferred to the lipoamide by an earlier intermediate in the process.
The pyruvate dehydrogenase complex (PDC) is a mitochondrial multienzyme complex composed of three different enzymes
What reaction is catalyzed by enzyme 2 of the pyruvate dehydrogenase complex ?the pyruvate dehydrogenase complex is the bridge between glycolysis and the citric acid cycle
Five coenzymes are used in the pyruvate dehydrogenase complex reactions: thiamine pyrophosphate or TPP, flavin adenine dinucleotide or FAD, coenzyme A or CoA, nicotinamide adenine dinucleotide or NAD, and lipoic acid.during the reactions catalyzed by the pyruvate dehydrogenase complex, it is first reduced to dihydrolipoamide, a dithiol or the reduced form of the prosthetic group, and then, reoxidized to the cyclic form.Learn more about Pyruvate dehydrogenase complex here:
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Lead crystallizes in the face-centered cubic lattice. What is the coordination number for pb?.
The coordination number for pb will be 12
Four atoms make up each unit cell of the face-centered cubic (fcc), which has a coordination number of 12. Two atoms make up each unit cell of the body-centered cubic (bcc), which has a coordination number of eight.
What is Coordination number ?The number of atoms, ions, or molecules that a central atom or ion in a complex, coordination compound, or crystal holds as its closest neighbours.
The number of nearby atoms or ions that surround an atom or ion is known as the coordination number. The coordination number for FCC and HCP systems is 12.Tetracarbonylnickel, Ni(CO)4, for instance, has a coordination number of 4 due to the four CO ligands that are bonded to the Ni atom.Learn more about Coordination number here:
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What happens to the carbon atom in the transformation of chloromethane to methyllithium?
The carbon atom reduced in the transformation of chloromethane to methyllithium.
The reaction between chloromethane and lithium form methyllithium.
[tex]CH_{3} Cl+ 2Li[/tex] → [tex]CH_{3} Li+ LiCl[/tex]
In above reaction, methyllithium is formed by the dispersing of lithium metal and adding chloromethane .
The carbon atom in chloromethane is partial positive charge because chlorine is high electronegative atom. The carbon atom in methyllithium is partial negative charge because carbon is more electronegative than lithium.
So, in above reaction two lithium metal donate two electron ( each lithium donate one electron) to the carbon atom(having positive charge) of chloromethane and get negative charge in methyllithium .
The gain of electron is reduction. So,The carbon atom reduced in the transformation of chloromethane to methyllithium.
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Please Help!
3/1H + 2/1H → 1/0n + ?
a. 4/4Be
b. 2/1H
c. 3/0n
d. 4/2He
Answer:
I'm pretty sure the answer Is c because I think I remember doing something like that so yeah
125) How many known elements are on the periodic table?
A) 101
B) 78
C) 118
D) 148
126) The formula for ethanol alcohol is C2HsOH. How many hydrogen atoms are
there?
A) 2
B) 5
C) 6
D) 7
127) The formula for ethanol alcohol is C¿HsOH. How many total atoms are there?
A) 4
B) 7
C) 9
D) 11
128) What is the symbol for Gold?
A) Go
B) Au
C) Sn
D) C
Explanation:
125)118
126)6
127)9
128)Au
There are 118 elements discovered yet and they are included in the periodic table.There are 6 hydrogens in ethanol. Number of total atoms in it is 9. The symbol of gold is Au.
What is periodic table?Periodic table is a classification of elements discovered in nature. There are groups and periods for these elements where groups are vertical columns of elements with similar physical and chemical properties.
There are 118 elements in the periodic table. Thus option C is correct.
Ethanol is a simple alcohol formed by 2 carbons and 5 hydrogens with an OH group. Thus there are total 6 (option C) hydrogens and a total of 9 atoms (option C). Ethanol is widely used in making of alcoholic products.
The chemical symbol of gold is Au. Chemical symbols are elements are derived from their latin names. The latin name of gold is Aurom. Thus it has the symbol Au. Therefore, option B is correct.
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Which of the following atoms would be an ion?
A. An atom with 11 protons and 9 electrons.
B. An atom with 5 protons and 5 electrons.
C. None of these
D. An atom with 8 protons and 8 neutrons.
Answer:
best answer is D
Explanation:
if element has even number then protons and neutrons are same but if element has odd number then we should add 1 number in number of protons to know neutrons. but this rule is not work in 4 element that element are argon, nitrogen, hydrogen and one other
Use Table B in your Student Guide to answer the questions about ion concentrations.
A solution with a pH = 13 has approximately how many moles of OH– ions per liter?
0.1
How many moles of H+ would this same solution have per liter?
0.000000000000.1
⇒ 0.0000000000001
(Use the decimal form of your answer.)
A different solution with an H+ concentration of 1.0 × 10–4 would have a pH =
4
.
1. The amount of OH¯ present in the solution is 0.1 mol/L
2. The amount of H⁺ present in the solution is 0.0000000000001 mol/L
3. The pH of the solution with H⁺ concentration of 1×10⁻⁴ mol/L is 4
1. How to determine the amount of OH¯ in the solutionWe'll begin by obtaining the pOH of the solution
pH = 13pOH =?pH + pOH = 14
13 + pOH = 14
Collect like terms
pOH = 14 - 13
pOH = 1
Finally, we can determine the OH¯
pOH = 1OH¯ =?pOH = –Log [OH¯]
1 = –Log [OH¯]
Multiply through by –1
–1 = Log [OH¯]
Take the anti-log of –1
[OH¯] = anti-log of (–1)
[OH¯] = 0.1 mol/L
2. How to determine the amount of H⁺pH = 13H⁺ =?pH = –Log [H⁺]
13 = –Log [OH¯]
Multiply through by –1
–13 = Log [H⁺]
Take the anti-log of –13
[H⁺] = anti-log of (–13)
[H⁺] = 0.0000000000001 mol/L
3. How to determine the pHH⁺ = 1×10⁻⁴ mol/LpH =?pH = –Log [H⁺]
pH = –Log 1×10⁻⁴
pH = 4
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4. The equation for the decomposition of hydrogen peroxide is shown. 2H₂O₂(aq) → 2H₂O(l) + O₂(g) 48.0 25.0 cm³ of aqueous hydrogen peroxide forms 48.0 cm³ of oxygen at room temperature and pressure (r.t.p.). Calculate the concentration i aqueous hydrogen peroxide at the start of the experiment using the following steps ● Calculate the number of moles of oxygen formed. • Deduce the number of moles of hydrogen peroxide that decomposed. • Calculate the concentration of hydrogen peroxide in mol/dm³.
Answer:
Just add what they equal to hope this helps :)
Explanation:
The Haber process Select one: a. is used to manufacture ammonia b. transforms nitrogen to other nitrogen-containing compounds c. is used to recover sulfur from underground deposits d. is used to produce nitric acid e. none of these
The Haber process (a) is used to manufacture ammonia.
The Haber process, which artificially fixes nitrogen, is currently the primary industrial method for producing ammonia.
Using a metal catalyst and high temperatures and pressures, the process turns atmospheric nitrogen (N2) into ammonia (NH3) by reacting with hydrogen (H2).
Haber's reaction is - N2 + H2 ------> NH3
The gases (nitrogen and hydrogen) are passed through four beds of catalyst in this conversion, which is normally carried out at pressures above 10 MPa (100 bar; 1,450 psi) and between 400 and 500 °C (752 and 932 °F). Cooling is applied between each pass to maintain a reasonable equilibrium constant.
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Find the density of a substance whose volume is 10.0 mL and whose mass is 5.000 g
Answer:
.5 gm / ml
Explanation:
Density is defined as mass/ volume
so density of this substance is 5 gm / 10 ml = .5 gm/ ml
Managing large amounts of data and processing them quickly during communication between Earth and space is challenging. Which technology is most suitable to overcome this challenge
Utilizing wireless communication and camera imagery is the most effective technological solution to this problem.
To find the answer, we need to know more about the wireless communication and camera imagery
Wireless communication is what?The transmission of data or information between two or more sites without the use of an electrical conductor is known as wireless communication.It is difficult to manage enormous amounts of data and analyze them fast when communicating between Earth and space.Today, wireless connections are used to access the internet.Thus, we can conclude that, the wireless connectivity and camera imaging method meet this obstacle.
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If 100 pounds of chlorine gas is required for an operation, how many pounds of calcium hypochlorite (65%) would be needed for the same operation
The amount, in pounds of chlorine that will be needed, will be 201.37 pounds
Percent compositionCalcium hypochlorite goes by the chemical formula, [tex]Ca(ClO)_2[/tex].
In order to know the amount of calcium hypochlorite that will be needed for the operation, we first need to know the percent composition of chlorine in calcium hypochlorite.
Molar mass of calcium hypochlorite = 142.98 g/mol
There are 2 molecules of Cl in calcium hypochlorite. The molar mass will be 35.5 x 2 = 71 g/mol
Percent chlorine in calcium hypochlorite = 71/142.98 x 100 = 49.66%
So, what amount of calcium hypochlorite will give us 100 pounds of chlorine knowing that chlorine is 49.66% of calcium hypochlorite?
49.66% of X = 100 pounds
X = 100 x 100/49.66 = 201.37 pounds
Thus, 201.37 pounds of calcium hypochlorite will give us approximately 100 pounds of chlorine.
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A 0.500 L solution of 5 M Hydrochloric acid stock solution is used to make a diluted Hydrochloric acid solution of 2.08 M . How much water has to be used to dilute the stock solution
Answer:
0.702 L H₂O
Explanation:
To find the volume of water needed to dilute the stock solution, you need to (1) find the moles of the stock solution (via molarity formula), then (2) find the volume of the diluted solution (via molarity formula), and then (3) find the volume of water needed.
(Step 1)
Molarity (M) = moles / volume (L) <----- Molarity formula
5 M = moles / 0.500 L <----- Insert values
2.5 = moles HCl <----- Multiply both sides by 0.500
(Step 2)
Molarity = moles / volume <----- Molarity formula
2.08 M = 2.5 moles / volume <----- Insert values
(2.08 M) x volume = 2.5 moles <----- Multiply both sides by volume
volume = 1.20 L <----- Divide both sides by 2.08
(Step 3)
Diluted Volume = 1.20 L
Stock Volume = 0.500 L
Water Volume = ? L
Diluted Volume = Stock Volume + Water Volume
1.20 L = 0.500 L + Water Volume
0.702 L = Water Volume
What is the sign of δg for the folding process? what about for the unfolding (denaturation) process? how do you know?
It is a thermodynamically spontaneous process that means Protein folding occurs. The value of ΔG must be negative in the case of folding but in the case of unfolding, the value of ΔG must be positive.
When the process is thermodynamically spontaneous process results in Protein folding otherwise the process is unfolding.
The value for ΔG must be negative in the case of the folding process and the value for ΔG must be positive in the case of the unfolding process. The value of a thermodynamic parameter for the reverse reaction has an opposite sign but the same value that's why the value for ΔG must be positive and known as unfolding (denaturation) process.
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Which identifies an oxidation-reduction reaction?
a double replacement reaction
a neutralization reaction
a reaction in which oxidation numbers change
a reaction in which no electrons are transferred
The statement that identifies an oxidation-reduction reaction is a reaction in which oxidation numbers change (option C).
What is a redox reaction?A redox or oxidation-reduction reaction is a chemical reaction in which some of the atoms have their oxidation number changed.
In a chemical reaction that involves oxidation and reduction, the oxidation number of the involved ions either decreases or increases.
Therefore, the statement that identifies an oxidation-reduction reaction is a reaction in which oxidation numbers change.
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Water will expand more than ____________.
door
air
juice
Answer:
door
Explanation:
door I guess..................
Classify the electron configurations of neutral atoms based on whether they represent an excited‑state configuration or a ground‑state configuration.
Excited state configuration are 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹ , [Kr] 5s¹ 4d¹⁰ , [He] 2s¹ 2p⁵and Ground state configuration are [Ne] 3s²3p³ , [Ar] 4s¹ 3d⁶.
What is Electronic Configuration ?The electronic configuration of an element describe the symbolic notation that how electrons are distributed in its atomic orbitals.
What is Ground State of electronic configuration ?The ground state electronic configuration of an element describe the arrangement of an atom at its lowest possible energy state.
Cr has the ground state electronic configuration [Ar] 4s¹ 3d⁶.
Ag has the excited state electronic configuration [Kr] 5s¹ 4d¹⁰ .
Thus from the above conclusion we can say that Excited state configuration are 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹ , [Kr] 5s¹ 4d¹⁰ , [He] 2s¹ 2p⁵and Ground state configuration are [Ne] 3s²3p³ , [Ar] 4s¹ 3d⁶.
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Disclaimer: The question was given incomplete on the portal. Here is the complete question.
Question: Classify the electron configurations of neutral atoms based on whether they represent an excited state configuration or a ground state configuration.
Excited State Ground State
Answer Bank:
1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹
[Ar] 4s¹ 3d⁶
[Ne] 3s²3p³
[He] 2s¹ 2p⁵
[Kr] 5s¹ 4d¹⁰
(1.) Which neutral atom has the excited or ground state electronic configuration, [Ar] 4s¹ 3d⁶ ? Enter the name of the element.
(2.) Which neutral atom has the excited or ground state electronic configuration, [Kr] 5s¹ 4d¹⁰ ? Enter the name of the element
Which product is used on the natural nail prior to product application to assist in adhesion and serves to chemically bond the enhancement product to the natural nail
The product that is used on the natural nail prior to application to assist in adhesion and serves to chemically bond the enhancement product to the natural nail is known as nail primer.
What is a nail primer?A nail primer is a chemical agent used in esthetic centers before applying a colored polish to the nails and serves as an adhesive product.
The nail primers are also very useful for improving the cleaning efficiency of the product before its application.
Nail care products include different types of chemical formulations such as, for example, creams that reinvigorate the cuticle.
In conclusion, the chemical formulation employed on the natural nail that is capable of enhancing and also assisting adhesion is called the nail primer.
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A scientist observes light from a star with a wavelength 1 of 97 nanometers (9.7 x 108 m). What is the photon energy, E, of this light?
Use this information to help you:
v=£
speed of light in a vacuum, c = 3.00 x 108 meters/second
• Planck's constant, h = 4.136 × 10-15 ev-s
energy of the photon =
Answer:
1.28 x 10⁻¹⁵ eV
Explanation:
To find the energy, you can use the photon energy equation:
E = hc / λ
In this equation,
-----> E = energy (eV)
-----> h = Plank's Constant (4.136 x 10⁻¹⁵ eV*s)
-----> c = speed of light (3.00 x 10⁸ m/s)
-----> λ = wavelength (m)
You can find the energy of the photon by plugging the given values into the equation and solving.
E = hc / λ
E = (4.136 x 10⁻¹⁵ eV*s)(3.00 x 10⁸ m/s) / 9.7 x 10⁸ m
E = 1.2408 x 10⁻⁶ / 9.7 x 10⁸ m
E = 1.28 x 10⁻¹⁵ eV
How many moles of ammonia are produced when 5.0 moles of hydrogen react with excess nitrogen?
Taking into account the reaction stoichiometry, 3.33 moles of ammonia are produced when 5.0 moles of hydrogen react with excess nitrogen.
Reaction stoichiometryIn first place, the balanced reaction is:
N₂ + 3 H₂ → 2 NH₃
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
N₂: 2 moles H₂: 3 molesNH₃: 2 molesMass of ammonia formedThe following rule of three can be applied: if by reaction stoichiometry 3 moles of hydrogen form 2 moles of ammonia, 5 moles of hydrogen form how many moles of ammonia?
[tex]moles of ammonia=\frac{5 moles of hydrogenx 2 moles of ammonia}{3 moles of hydrogen}[/tex]
moles of ammonia= 3.33 moles
Finally, 3.33 moles of ammonia are produced when 5.0 moles of hydrogen react with excess nitrogen.
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The reaction between A2 (two large red spheres) and B2 (two small blue spheres) to produce AB is shown in the diagram. The reactants contain 4 A 2 molecules and 3 B 2 molecules. The products contain 6 A B molecules. Determine the limiting reactant for the reaction. AB A2 B2 no limting reactant
Answer:
B₂
Explanation:
The limiting reactant is always a reactant. You can determine which reactant is limiting by identifying which has the smaller mole-to-mole ratio with the product. This ratio can be found via the coefficients of the balanced reaction.
4 A₂ + 3 B₂ ---> 6 AB
4 moles A₂
------------------ = mole-to-mole ratio A₂/AB
6 moles AB
3 moles B₂
------------------ = mole-to-mole ratio B₂/AB
6 moles AB
Since the mole-to-mole ratio between B₂ and AB is smaller, B₂ must be the limiting reactant.