1. Describe how 13C NMR signals distinguish between o-xylene, m-xylene, and p-xylene.
2. Predict the 1H NMR spectrum of ethylbenzene . Use a line drawing to indicate the number of signals, their mutiplicities, and their approximate chemical shifts. Also give the proton ratios. Attach line drawing below.
3. Describe how the 1H NMR signals for substituents on the aromatic rings distinguish between mesitylene, n-propylbenzene, and cumene.
Answers
Answer:
1. 13C NMR signals can distinguish between o-xylene, m-xylene, and p-xylene by looking at the signals that correspond to the carbons of the alkyl groups that are connected to the benzene ring.
O-xylene has two methyl groups connected to the ring, m-xylene has one methyl and one ethyl group, and p-xylene has two ethyl groups connected to the ring.
The 13C NMR will show three signals for o-xylene (due to the two methyl groups), two signals for m-xylene (due to the one methyl and one ethyl group) and four signals for p-xylene (due to the two ethyl groups).
2. The 1H NMR spectrum of ethylbenzene will show four signals: two signals due to the protons in the benzene ring and two signals due to the ethyl group.
The signals in the benzene ring will be broad and the signals due to the ethyl group will be sharp. The proton ratio is 2:2, with the two signals due to the benzene ring being doublets and the two signals due to the ethyl group being doublets.
The approximate chemical shifts for the signals due to the benzene ring will be around 7.2-7.4 ppm and the approximate chemical shifts for the signals due to the ethyl group will be around 2.0-2.4 ppm.
3. The 1H NMR signals for substituents on the aromatic rings can be used to distinguish between mesitylene, n-propylbenzene, and cumene. Mesitylene has two methyl groups connected to the ring, n-propylbenzene has one methyl and one propyl group, and cumene has two propyl groups connected to the ring.
The 1H NMR will show three signals for mesitylene (due to the two methyl groups), two signals for n-propylbenzene (due to the one methyl and one propyl group) and four signals for cumene (due to the two propyl groups). The chemical shifts for the signals of the methyl groups will be around 1.2-1.4 ppm, the chemical shifts for the signals of the propyl groups will be around 1.9-2.2 ppm.
Learn more about Superposition And Energy here:
https://brainly.com/question/12493909#
#SPJ11
Related Questions
What is a binary ionic compound?An element.A compound made of two ions.A mixture.A compound made of two or more ions.
Answers
Answer
A compound made of two ions.
Explanation
A binary compound is a compound formed from two different elements. There may or may not be more than one of each element.
For a binary ionic compound, a metal will always be the first element in the formula, while a nonmetal will always be the second.
Hence, a binary ionic compound is a compound made of two ions.
What is the pOH of water?
Answers
Answer:
A. 7
(assuming the water is neutral)
What's the meaning of love?
Answers
Answer: Love is when you feel like you can touch the sky when your around that person, when your at your best self or that person and when you put their needs before yours because your needs just don't matter. When you feel like you can't stop thinking about that person or you can stop smiling when you think of them. Its when you feel this warm, safe feeling when your around them. And if you really love them then my answer should be true for you.
Explanation:
because iv'e felt and have been in love before....
Answer:
Love is an intense, deep affection for another person. Love also means to feel this intense affection for someone. Love can also refer to a strong like for something or to like something a lot. Love has many other senses both as a verb and a noun
how many atoms of HCl are needed to produce 0.62 moles of hydrogen gas
Answers
Answer:
0.2 moles
Explanation:
The equation is given by;
2HCl => H² + Cl²
According to stoichiometry;
\( \frac{n \: hcl}{2} = \frac{n \: h {}^{2} }{1} \)
\(nhcl = 2 \times nh {}^{2} \)
To produce 0.62 moles of H² gas we need,
nHCL=2×0.62=1.24 moles
Using the relation;
number of moles:Number of atoms/Avogadro's constant
We can then say;
N(numb. of atoms)=n×Na
Number of atoms=1.24×6.02×10²³
Number of atoms=7.5852×10²³ atoms
If 12.52mol of aluminum metal is reacted with2.38mol of iron (III) oxide, how many particles, inmoles of iron metal are likely to form?Reaction: 2Al(s) + Fe₂O3(aq)--> Al2O3(aq) + 2Fe(s)
Answers
Answer
4.76 mol Fe
Procedure
Consider the following balanced equation and determine the limiting reagent using the coefficients method
2Al(s) + Fe₂O3(aq)--> Al2O3(aq) + 2Fe(s)
\(12.52\text{ mol Al}\frac{2\text{ mol Fe}}{2\text{ mol Al}}=12.52\text{ mol Fe}\)\(2.38\text{ mol Fe}_2\text{O}_3\frac{2\text{ mol Fe}}{1\text{ mol Fe}_2\text{O}_3}=4.76\text{ mol Fe}\)The lowest amount is the one produced by the iron (III) oxide therefore that is the limiting reagent and 4.76 mol of Fe is the max amount that can be produced of Iron.
What is the maximum number of grams of h2s that can be produced from 2 mol of sulfate ions by the reaction of equation 1?
Answers
To determine the maximum number of grams of H2S that can be produced from 2 mol of sulfate ions, you need to use stoichiometry. The equation 1 you mentioned is not provided in the question. However, I can provide a general approach to solving this type of problem.
1. Start by balancing the chemical equation if it is not already balanced.
2. Determine the mole ratio between sulfate ions and H2S. This can be found by looking at the coefficients of sulfate ions and H2S in the balanced equation.
3. Multiply the number of moles of sulfate ions (2 mol) by the mole ratio to find the number of moles of H2S that can be produced.
4. Finally, convert the moles of H2S to grams using the molar mass of H2S.
Remember to always use the molar masses of the substances involved in the reaction to convert between moles and grams.
To know more about stoichiometry visit:
https://brainly.com/question/28780091
#SPJ11
the relationship between the amount of reactant consumed and time if curvilinear.
Answers
The statement is false. The relationship between the amount of reactant consumed and time is not curvilinear, but rather follows a specific pattern based on the reaction kinetics.
In most chemical reactions, the amount of reactant consumed with respect to time follows a linear or exponential relationship. In a linear relationship, the rate of reaction is constant, and the amount of reactant consumed increases linearly with time. This often occurs in simple reactions with a constant rate. In contrast, an exponential relationship is observed in many reactions governed by complex kinetics. Initially, the reaction rate is high, and the amount of reactant consumed is rapid. As the reaction progresses, the rate slows down, and the amount of reactant consumed per unit of time decreases exponentially. This can occur in reactions with multiple steps, intermediate species, or factors affecting the reaction rate. Therefore, the relationship between the amount of reactant consumed and time is typically linear or exponential, depending on the reaction kinetics, and not curvilinear.
Learn more about curvilinear here:
https://brainly.com/question/30902652
#SPJ11
Through bonding, atoms are able to attain the same electron configuration as a(n)?
Answers
The placement of electrons in orbitals surrounding an atomic nucleus is known as electronic configuration
What is electron configuration?The placement of electrons in orbitals surrounding an atomic nucleus is known as electronic configuration, also known as electronic structure or electron configuration. As follows: 1s will be filled first, with a maximum of 2 electrons, followed by 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, and 5p. The Aufbau Principle, the Pauli-Exclusion Principle, and Hund's Rule are a set of three guidelines we must adhere to while allocating electrons to orbitals. To determine the valence electrons of an atom, electron configurations assist us to understand the chemical behavior of elements. The shell number (n), kind of orbital, and superscript indicating the number of electrons in the orbital are the first three symbols used to represent the electron configuration.
To learn more about electron configuration, refer to:
https://brainly.com/question/26084288
#SPJ4
5. What would be the overall charge of a substance that contains 15 protons, 18 electrons, and 16neutrons?a. +15b. -18C. +3d. -3
Answers
Explanation:
We have to find the overall charge of a substance that contains 15 protons, 18 electrons and 16 neutrons.
A proton is a subatomic particle that we can find in the nucleus of an atom. Its charge is +1.
An electron is a subatomic particle that we can find around the nucleus and its charge is opposite to the one of the proton. Its charge is -1.
A neutron is a subatomic particle that can be found in the nucleus and has no charge, so its charge is 0.
charge of p+ = +1 charge of n° = 0 charge of e- = -1
Our element has 15 protons, 18 electrons and 16 neutrons, the overall charge will be.
overall charge = 15 * (+1) + 18 * (-1) + 16 * (0)
overall charge = -3
Answer: d. -3
Fill in the blanks to complete each statement about the study of our atmosphere.
is used to locate aWhich phrase describes the phenomenon that implies that small atmospheric changes affect the weather weeks or months later?
the butterfly effect
short-range forecast
long-range forecast
automated weathernd track severe storms.
is the study of the atmosphere, which includes weather forecasting.
In addition to observing wind speed, wind direction, temperature, air pressure, and humidity, meteorologists observe
.
Answers
The butterfly effect is real, in the sense that small changes at small scales can change the weather forever. But it is doubtful that a butterfly effect could produce a meaningful change in the weather. The correct option is A.
The butterfly effect was introduced by Edward Lorenz in the context of atmospheric predictability. Weather is the most familiar phenomenon associated with the butterfly effect. This effect is mainly used to predict the daily weather conditions.
The butterfly effect is defined as the sensitive dependence on the starting conditions in which a slight variation in one condition of a nonlinear system can generate huge differences in the later outcomes.
Thus the correct option is A.
To know more about butterfly effect, visit;
https://brainly.com/question/11400049
#SPJ1
what is the naming for TiO?
Answers
Answer:
Titanium oxide.
Explanation:
How many molecules of O2 are produced from 192 grams of
SeO2? 2Cu2O3 +8SeO2 -->4CuSe2 +11 O2
Answers
Answer:
suck yo mum
Explanation:
do it for free answers uwu
In ionic bonding, atoms _____.
share electrons
are connected by strong electrical forces
lose protons and form ions
stop moving completely
Answers
Answer:
lose protons and form ions
Explanation:
I thjink hope this helps
PLease mark brainliest
Which term best describes salt water made by combining table salt with pure water
Answers
Answer: "homogenous mixture." out of these 2
brine, salt water, particularly a highly concentrated water solution of common salt (sodium chloride).
HOPE THIS HELPS.✨
Nate measured an iron bar. He put the iron bar in the hot sun. When he measured the bar after it had been in the sun, it was slightly longer. Which sentence best describes what happened to the iron atoms after the bar was left in the hot sun?
Consider what happens to an iron bar when left out and exposed to sunlight and why it happens.
Evaluate the statements and select the one that best represents what happens.
Provide your reasoning in the text box provided.
The number of atoms increased.
The size of the atoms increased.
The space between each atom increased.
The air in the spaces between the iron atoms expanded.
Answers
Answer:
need dim points back ma boi
Explanation:
Assume a reaction takes place in a basic solution to form the given products:
MnO4–(aq) + Cl–(aq) MnO2(s) + Cl2(g) (unbalanced)
Balance the given half-reactions for atoms and charge:
MnO4– + H2O MnO2 + OH–
Cl– Cl2
Help Please T-T
Answers
Answer:
There is no hydrogen in the first half reaction
combustion of 25.74 g of a compound containing only carbon, hydrogen, and oxygen produces 50.28 gco2 and 25.73 gh2o .A. C4H10O2B. C8HO12C. C2H5OD. C4H8O2
Answers
The compound must be C2H5OH (ethanol).
To solve this problem, we need to use the law of conservation of mass, which states that the mass of the reactants must equal the mass of the products.
First, we need to calculate the total mass of the products:
50.28 g CO2 + 25.73 g H2O = 75.01 g
This means that the total mass of the reactants must also be 75.01 g.
Next, we need to determine the molar ratios of carbon, hydrogen, and oxygen in each of the compounds given.
A. C4H10O2: 4 moles of carbon, 10 moles of hydrogen, 2 moles of oxygen
B. C8HO12: 8 moles of carbon, 12 moles of hydrogen, 1 mole of oxygen
C. C2H5OH: 2 moles of carbon, 6 moles of hydrogen, 1 mole of oxygen
D. C4H8O2: 4 moles of carbon, 8 moles of hydrogen, 2 moles of oxygen
Using these ratios, we can calculate the theoretical mass of each compound that would be required to produce 75.01 g of products.
A. C4H10O2: (4 x 12.01 g) + (10 x 1.01 g) + (2 x 16.00 g) = 122.14 g
B. C8HO12: (8 x 12.01 g) + (12 x 1.01 g) + (1 x 16.00 g) = 188.18 g
C. C2H5OH: (2 x 12.01 g) + (6 x 1.01 g) + (1 x 16.00 g) = 46.07 g
D. C4H8O2: (4 x 12.01 g) + (8 x 1.01 g) + (2 x 16.00 g) = 144.11 g
Now we can compare the theoretical mass of each compound to the given mass of 25.74 g.
A. C4H10O2: theoretical mass = 122.14 g, too large
B. C8HO12: theoretical mass = 188.18 g, too large
C. C2H5OH: theoretical mass = 46.07 g, matches given mass
D. C4H8O2: theoretical mass = 144.11 g, too large
Therefore, the compound must be C2H5OH (ethanol).
To know more about law of conservation of mass visit:
https://brainly.com/question/28711001
#SPJ11
The most common empirical formula for a compound with these molar masses is C₃H8O₂. Therefore, the answer is A. C₃H8O₂
To solve this problem, we can use the balance equation for the combustion reaction:
30.04 g C + 51.12 g CO₂ + 28.45 g H₂O
Since we know the masses of CO₂ and H₂O produced, we can use the mole ratios of the compound to the product to find the molar mass of the compound.
The mole ratio of C to CO₂ is 30.04 g/51.12 g = 0.5839 mol/mol CO₂
The mole ratio of H to H₂O is 28.45 g/18 g = 1.60 mol/mol H₂O
The molar mass of the compound can be found by multiplying the moles of each element by their atomic mass:
0.5839 mol CO₂ * 44.01 g/mol = 24.637 g CO₂
1.60 mol H₂O * 18.02 g/mol = 28.454 g H₂O
Since we only have one unknown element, we can use the molar mass of carbon to find the empirical formula of the compound.
We can write the empirical formula as a ratio of carbon to the sum of the other elements:
C : C + H + O = 0.5839/1.60 = 0.3526 mol/mol
Learn more about molar masses
https://brainly.com/question/31545539
#SPJ4
Full Question: Combustion of 30.04 g of a compound containing only carbon, hydrogen, and oxygen produces 51.12 g CO2, and 28.45 g H2O
What is the empirical formula of the compound?
A. C3H8O2
B. C3H8O3
C. C4HO4
D. C6H16O4
What is van t hoff equation?
Answers
Van't Hoff general equation is given as −ΔG° = RT logKp.
Generally, the Van't Hoff factor can be basically defined as the ratio of the concentration of particles formed when a substance is dissolved to the concentration of the substance by mass. Van't Hoff factor is described as the extent to which a substance associates or dissociates in a solution.
The Van't Hoff equation generally gives the relationship between the standard gibbs free energy change and the equilibrium constant. Van't Hoff factor is represented by the equation −ΔG° = RT logKp.
Van't Hoff equation can also be written as `piV=nRT` where n is the no. of moles of solute present in V litres of solution, `pi` is the osmotic pressure, T is temperature and R is gas constant or solution constant.
Learn more about Van't Hoff factor from the link given below.
https://brainly.com/question/24598605
#SPJ4
(c) A new car produces 132 g of carbon dioxide per kilometre travelled.
Petrol contains mainly octane, C8H₁8. This is the equation for the complete combustion
of octane.
C8H18 +12.5 O₂8CO2 +9H₂0
Calculate the mass of octane that burns to produce 132 g of carbon dioxide.
[3]
Answers
132 gm of CO₂ is generated by combustion of 342 gm of C₈H₁₈.
What is Molecular Mass?The molar mass of a chemical compound is defined as the ratio between the mass and the amount of that substance in any sample. A material's molar mass is a bulk characteristic rather than a molecular one.
The molar mass of a substance is its mass expressed in grams per mole. G/mol, or grams per mole, is the sign for molar mass. The ratio between the mass of an isotope and the mass of the isotope carbon is known as the isotopic atomic mass, or mass of a single isotope of any particular element. -12
The reaction is :
C₈H₁₈ + 12.5O₂ ----> 8CO₂ + 9H₂O
Molar mass of C₈H₁₈ is = 12*8 + 18*1 = 114 gm
Molar mass of CO₂ is = 12+ 16*2 = 44gm
44gm of CO₂ is generated by 114 gm of C₈H₁₈
1 gm of CO₂ is generated by 114/44 gm of C₈H₁₈
132 gm of CO₂ is generated by combustion of 114*132/44 = 342 gm of C₈H₁₈
To learn more about Molar mass refer to :
brainly.com/question/24172406
#SPJ1
Will mark brainliest for who is right
Which properties change the composition of a substance?
chemical and physical properties
neither chemical nor physical properties
physical properties
chemical properties
Answers
Sam is about to drop a golf ball from his hand.
Answers
Get ready, you should catch it.
Answer:
As an object falls, its gravitational potential energy decreases as its speed—and therefore its kinetic energy—increases.
Explanation:
Study Island
If a football is 625 mL volume and 0.64 g/mL density what is the mass
Answers
explanation
the formula for density is density equals mass divided by volume so you plug in .64 for the density and 625 for the volume. .64= m/625. to solve for mass you would multiply both sides by 625 to get the mass
which compound forms 2 parts of hydrogen and 1 part of oxygen?
Answers
Answer:
water
for one molecule of water each atom has the atomic mass unit, u,shown.
Explanation:
*can i be the brainliest*
a gas in a closed, flexible container is slowly cooled from 50˚c to 25˚c. what is the ratio of the final volume of the gas to its initial volume? assume ideal behavior.
Answers
The ratio of the final volume of the gas to its initial volume is approximately 0.923.
According to the ideal gas law, PV = nRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature in Kelvin.
To determine the ratio of the final volume to the initial volume, we can assume that the number of moles and pressure remain constant.
Using the combined gas law, we have:
P₁V₁ / T₁ = P₂V₂ / T₂
Since the pressure and moles are constant, we can simplify the equation to:
V₁ / T₁ = V₂ / T₂
Converting the temperatures to Kelvin:
T₁ = 50˚C + 273.15 = 323.15 K
T₂ = 25˚C + 273.15 = 298.15 K
Plugging in the values:
V₁ / 323.15 = V₂ / 298.15
To find the ratio of the final volume to the initial volume (V₂ / V₁), we can rearrange the equation:
V₂ / V₁ = T₂ / T₁
V₂ / V₁ = 298.15 K / 323.15 K
Simplifying the ratio:
V₂ / V₁ ≈ 0.923
Learn more about volume, here:
https://brainly.com/question/29586858
#SPJ1
#7) How many waves are in this picture?
Answers
Answer:
4
Explanation:
Answer:
B.
Explanation:
I don't know much about this subject, but it seems that a wave is when the line is above the line in the middle.
calculate the average atomic mass for element x. x-14 (95% abundance), x-15 (3% abundance), x-16 (2% abundance).
Answers
The average atomic mass for element X is approximately 14.07 atomic mass units (AMU).
To calculate the average atomic mass for element X, we will multiply the mass of each isotope by its respective abundance and then sum the values.
Average atomic mass = (Mass of isotope 1 × Abundance of isotope 1) + (Mass of isotope 2 × Abundance of isotope 2) + (Mass of isotope 3 × Abundance of isotope 3)
Average atomic mass = (14 × 0.95) + (15 × 0.03) + (16 × 0.02)
Calculating this expression, we get:
Average atomic mass = 13.3 + 0.45 + 0.32 = 14.07
To know more about atomic mass refer to-
https://brainly.com/question/29117302
#SPJ11
Please tell me the answer
Answers
Answer:
the pair of isotopes are b and e
the element with mass no of 19 is C
the element with atomic no 7is D
Explanation:
B and E are isotopes bcos they have the same atomic no, i.e no of protons. They bother have atomic no of 17 BUT have different mass no i.e sum of neutrons and protons.
(b)C is correct because the sum of the protons and neutrons is 19
(c) D because it has 7 protons
GIVING 30 POINTSSS Please HELPP
Answers
Answer: The second one
Explanation: Color works by specific light wavelengths reflecting off surfaces and reaching our eyes. If the red light is absorbed it can't reach our eye cones and we won't be able to see it.
If you start with 3 moles of sodium and 3 moles of chlorine to produce sodium chloride, what is the limiting reagent?(You will need to balance
the equation first.)
Na + Cl2 -> NaCl A. They are equal B. Na C. Cl2 D. NaCl
Answers
Answer:
B. Na
Explanation:
Once balanced you get 2Na + Cl₂ ⇒ 2NaCl. Sodium is the limiting reagent because it would produce the smallest amount of the product (NaCl)–while chlorine is the excess reagent. Based off of the Na in the balanced equation, it would produce 3 moles of NaCl, and for Cl₂ it would produce an excess of 6 moles of NaCl. [It'd be wise to utilize stoichiometric factors to get a good grasp of this]
Frozen orange juice is reconstituted by adding water to it. What kind of change is described? A. Physical. B. Chemical. C. Photochemical. D. Thermochemical.
Answers
The change described in the process of reconstituting frozen orange juice is a physical change. A physical change refers to a transformation that affects one or more physical properties of a substance, such as its size, shape, or state, without altering its chemical composition.
Adding water to frozen orange juice to reconstitute it causes a change in its volume, but it does not create new substances or cause a chemical reaction. Therefore, it is considered a physical change. Other examples of physical changes include cutting an apple, melting ice, and boiling water.
Find out more about physical change
brainly.com/question/13056570
#SPJ4