Answer: 22.78KJ/ mol
Explanation:
The computation of activation energy [tex]E_0[/tex] follows by formula:
[tex]\ln (\dfrac{K_2}{K_1}) = (\dfrac{E_a }{ R}) (\dfrac{1}{T_1} -\dfrac{ 1}{T_2})[/tex]
Given:[tex]T_1 = 376.0^{\circ}C =376+273K= 649 K[/tex]
[tex]K_1 = 4.8 \times10^8[/tex]
[tex]T_2 = 280.0^{\circ}C = 273+280K=553 K ,\ \ \ K_2 = 2.3 \times 10^8[/tex]
[tex]\ln(\dfrac{2.3 \times10^8 }{ 4.8 \times 10^8}) = (\dfrac{E_a }{ 8.314}) (\dfrac{1}{649} - \dfrac{1}{553})\\\\\Rightarrow\ \ln(0.479) = (\dfrac{E_a }{ 8.314}) (-\dfrac{96}{358897})\\\\\Rightarrow\ -0.73605468= (\dfrac{E_a }{ 8.314}) (-\dfrac{96}{358897})\\\\\Rightarrow\E_a=-0.73605468\times 8.314\times\dfrac{-358897}{96}=22878.033\\\\\Rightarrow\E_a=22878.033\ J/mol=22.78 KJ /mol[/tex]
Hence, the activation energy for this reaction =22.78KJ/ mol
Hydrazine reacts with 2,4-pentanedione to yield 3,5-dimethylpyrazole. Including protonations and deprotonations, the reaction takes 12 steps. Write out the mechanism on a sheet of paper and then draw the structure of the product of step 9.
Answer:
Explanation:
From the given information:
We explained the reaction mechanism of 2,4-pentanedione with hydrazine to yield 3,5-dimethylpyrazole as shown below;
At the initial stage, the carbonyl oxygen gains a proton, increasing the carbonyl carbon's electrophilicity. After that, the carbonyl carbon is being attacked by hydrazine. Then, the process proceeds with the species formed where removal of a proton takes place. Similarly, hydroxyl oxygen gains a proton. After that, the water molecule is being removed, and further rearrangement of an electron occurs at the site of nitrogen in hydrazine.
From species formed, the removal of a proton takes place. Finally, all step is being repeated to yield the final product known as 3,5 - dimethylpyrazole.
How many Joules are required to change 30.0g ofice at -20°C to steam at 140°C? There are a few steps you should follow using the following given
information
• The specific heat of ice is 2.108 J/g*°C
• The specific heat of water is 4.18 J/g*°C
• The specific heat of steam is 2.010 J/g*°C
• Hf for H2O = 334 334 J/g
• Hv for H2O = 2260 J/g
Answer:
Q = 10118.4 j
Explanation:
Given data:
Mass of ice = 30.0 g
Initial temperature of ice = -20°C
Final temperature = 140°C
Energy required = ?
Solution:
The specific heat of ice is 2.108 J/g*°C
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 140°C - (-20°C)
ΔT = 160°C
Q = 30.0 g× 2.108 J/g°C ×160°C
Q = 10118.4 j
when the tempature of the enviroment changes, the body tempature of a reptile
For ethane (C2H6), what is the correct framework of the Lewis structure?
The central atoms consist of two hydrogens.
The central atoms consist of two hydrogens and one carbon.
The central atoms consist of one hydrogen and one carbon.
The central atoms consist of two carbons.
Answer: The answer is D. The central atoms consist of two carbons.
Explanation:
Answer:
The central atoms consist of two carbons
Explanation:
Took the test! hope this helps!
What is the equilibrium expression for the following reaction: N2 (g) 3 H2 (g) rightwards harpoon over leftwards harpoon with blank on top 2 NH3 (g)
Answer:
[tex]Kp = \frac{P_{NH_{3}} ^{2} }{P_{N_{2}} ^{}P_{H_{2}} ^{3} }[/tex]
Explanation:
For the reaction at equilibrium:
N₂ (g) + 3 H₂(g) ⇄ 2 NH₃ (g)
Since this is an equilibrium in the gas phase, the equilibrium expression is obtained from the partial pressures (P) of the products (NH₃) and reactants (N₂ and H₂) raisen to their stoichiometric coefficients:
[tex]Kp = \frac{P_{NH_{3}} ^{2} }{P_{N_{2}} ^{}P_{H_{2}} ^{3} }[/tex]
An aqueous solution contains 0.22 M ammonium iodide. One liter of this solution could be converted into a buffer by the addition of:
Answer:
The addition of NH₃⁺
Explanation:
A buffer is an aqueous mixture of a weak acid and its conjugate base or vice versa.
In ammonium iodide, NH₄I, the ions in solution are ammonium ion, NH₄⁺ and iodide ion, I⁻.
The iodide ion is the conjugate base of the HI, a STRONG ACID, that means the addition of HI in solution wouldn't produce a buffer.
And, NH₄⁺ is the conjugate acid of the NH₃, a WEAK BASE, that means the addition of NH₃ to the solution will produce a buffer: The mixture of a weak base, NH₃ and its conjugate acid, NH₄⁺
Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide. A 4.50-g sample of CaO is reacted with 4.34 g of H2O. How many grams of the excess reagent remain after the reaction is complete
Answer:
2.88 g
Explanation:
First, let us look at the balanced equation of the reaction:
[tex]CaO(s) + H_2O (l) --> Ca(OH)_2(s)[/tex]
From the equation, 1 mole of CaO reacts with 1 mole of H2O to produce 1 mole of [tex]Ca(OH)_2[/tex].
mole = mass/molar mass
4.50 g of CaO = 4.50/56.08 = 0.08 mole
4.34 g of H2O = 4.34/18.02 = 0.24 mole
The ratio of moles of CaO and H2O should be 1:1, hence, H2O is in excess.
Excess mole of H2O = 0.24 - 0.08 = 0.16 mole
mass of 0.16 mole of H2O = mole x molar mass = 0.16 x 18.02 = 2.88 g
Therefore, 2.88 g of the excess reagent (water) would remain after the reaction is complete.
Calculate the concentration of 45.0 mL of a phosphoric acid solution that neutralized 20.8 mL of 0.532 M sodium hydroxide. Assume complete ionization of the acid.
Answer:
0.0820M H₃PO₄
Explanation:
THe phosphoric acid, H₃PO₄ reacts with sodium hydroxide, NaOH, thus:
H₃PO₄ + 3NaOH → Na₃PO₄ + 3H₂O
The moles of NaOH used to neutralize the acid are:
Moles NaOH:
20.8mL = 0.0208L * (0.532mol / L) = 0.0111 moles NaOH.
That means moles of phosphoric acid in the solutionare:
0.0111 moles NaOH * (1mole H₃PO₄ / 3 moles NaOH) =
0.00369 moles H₃PO₄
These moles are in 45.0mL = 0.045L. The molar concentration of the solution are:
0.00369 moles H₃PO₄ / 0.045L =
0.0820M H₃PO₄Movement of earths tectonic plates appears to be caused by
Why does the 4s sublevel fill up before the 3d sublevel? What principle is that based on?
According to the Aufbau principle, the 4s orbital is filled first instead of the 3d orbital
Further explanationEach electron shell and its orbitals have a specific energy level.
The farther the shell is from the atomic nucleus, the higher the energy level.
This energy level is expressed in the form of electron configurations.
Writing electron configurations starts from the lowest to the highest sub-shell energy level. There are 4 sub shell in the shell of an atom, namely s, p, d and f.
Charging electrons in the subshell uses the following sequence:
1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶, 5s², 4d¹⁰, 5p⁶, 6s², etc.
According to Aufbau, electrons occupy orbitals of the lowest energy level
So the 4s orbital has a lower energy level than the 3d orbital, so the electrons fill the 4s orbital first
A compound has a molar mass of 100 g/mol and the percent composition (by mass) of 65.45% C, 5.45% H, and 29.09% O. Determine the empirical formula and the molecular formula.
Answer:
Empirical formula: C3H30
Molecular formula: C6H6O2
Explanation:
The empirical formula can be calculated thus:
65.45% C - 65.45g
5.45% H - 5.45g
29.09% O - 29.09g
We convert each mass to mole by dividing by their respective atomic mass:
C = 65.45/12 = 5.45mol
H = 5.45/1 = 5.45mol
O =29.09/16 = 1.82mol
Next, we divide each mole value by the smallest value;
C = 5.45mol/1.82 = 2.99
H = 5.45mol/1.82 = 2.99
O = 1.82mol/1.82 = 1
Approximately, the empirical ratio of C, H and O is 3:3:1 i.e. C3H3O
Molecular formula is calculated thus:
(C3H3O)n = 100g/mol
{12(3) + 1(3) + 16}n = 100
(36+3+16)n = 100
(55)n = 100
n = 100/55
n = 1.82
n = 2
Molecular formula= (C3H3O)2
C6H6O2
I have 5.33 moles of helium gas at 1.56 atm and a temperature of 25 ° C. What is the volume of my helium sample? 
Answer:
V = 83.6 L
Explanation:
Given data:
Number of moles of He = 5.33 mol
Pressure of gas = 1.56 atm
Temperature of gas = 25°C
Volume of sample = ?
Solution:
Formula:
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
Now we will convert the temperature.
25+273 = 298 K
Now we will put the values in formula.
1.56 atm × V = 5.33 mol × 0.0821 atm.L/ mol.K × 298 K
1.56 atm × V = 130.4 atm.L
V = 130.4 atm.L/1.56 atm
V = 83.6 L
Which of the following questions about the flu is a scientific question?
A. Is a flu shot effective in preventing the flu?
B. Is public fear of the flu out of control?
C. Is the benefit of drugs for the flu higher than the cost?
D. Who should receive a flu shot if there is not enough flu vaccine for
everyone?
Answer:
A is the correct answer
Explanation:
Ammonium perchlorate is the solid rocket fuel used by the U.S. Space Shuttle. It reacts with itself to produce nitrogen gas , chlorine gas , oxygen gas , water , and a great deal of energy. What mass of oxygen gas is produced by the reaction of of ammonium perchlorate
Answer:
2.9 g
Explanation:
The computation of the mass of oxygen gas produced is shown below:
As we know that
[tex]2NH_4ClO_4 \rightarrow N_2 + Cl_2 + 2O_2 + 4H_2O[/tex]
Now
The [tex]NH_4ClO_4[/tex] presented in 9.6g = 9.6 g/117.49 g/mol
And, the mole ratio between the [tex]NH_4ClO_4 : H_2O[/tex] is 1 : 2
The moles of [tex]H_2O[/tex] produced is 2 × 9.6 g/117.49 g/mol
So,
Mass of H2O produced is
= 18.015 g/mol × 2 × 9.6 g/117.49 g/mol
= 2.94 g
A student filled a graduated cylinder with water to the 15.0 mL mark she placed a metal object with a mass of 33.65g into the cylinder when the object was completely submerged in the water the water level rose to 18.3mL what is the density of the object
Answer:
The answer is 10.2 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question
volume = final volume of water - initial volume of water
volume = 18.3 -15 = 3.3 mL
We have
[tex]density = \frac{33.65}{3.3} \\ = 10.19696969...[/tex]
We have the final answer as
10.2 g/mLHope this helps you
If the molar absorptivities of HIn and In- were determined at a wavelength corresponding to an isosbestic point, how would they compare in value
Answer:
A Weak acid indicator has general formulae HIn- and base has In-.
When constructed a plot determining wavelength equilibrium reached according to the equation HIn(aq) + H2O(l) ↔ In-(aq) + H3O+(aq)
HIn(aq) is the acid, that has a different color from the base In-(aq). When the pH is low, the concentration of the hydronium ion H3O+ is high and equilibrium is toward the left, producing the color A.
At high pH, the concentration of H3O+ is low, so equilibrium tends toward the right side of the equation and color B is displayed
which 2 letters have the most kinetic energy
Answer:
X and Z
Explanation:
See attachment for complete question...
Your question illustrates kinetic energy as it relates to height (according to the attachment)
Kinetic energy increases with a decrease in height.
So, from the attachment...
W and Y are at higher heights.
While X and Z are at lowest heights
By the analysis above, kinetic energy would be at highest at X and then Z.
Hence, the answer to the question is X and Z.
What else is produced during the replacement reaction of magnesium and hydrochloric acid? I Will Give Brainiest To who ever gets right
Mg + 2HCl H2 + ________
MgCl2
Mg2Cl2
Mg2Cl
MgCl
Explanation:
In the reaction of magnesium with hydrochloric acid magnesium chloride and hydrogen gas is formed.
Equation -
Mg + 2HCl → MgCl₂ + H₂↑
Therefore,
Option A is correct ✔.
Answer:
Its A
Explanation: Just took the Pre-Unit test
The atoms of which element will form cations?
A. selenium
B. neon
C. copper
D. iodine
Answer Copper, copper is a type of metal, so it can form cations
The atoms of element will form cations is Copper as to get the stable electronic configuration.
What are cations?
Cations are those species which carries possitive charge on it and produced by any element by lossing of their outermost electrons.
An atom will form cation to get the stable outermost configuration.
Selenium belongs from the oxygen group and in the outermost shell 6 electrons are present, so it shows the negative oxidation state as it accepts the two electron to get the stable configuration and form an anion.Neon belongs from the noble gas group which already have stable configuration, so it does not form any cation or anion.Iodine belongs from the halogen groups, and in the outermost shell 7 electrons are present, so it shows the negative oxidation state as it accepts the one electron to get the stable configuration and form an anion.Copper is a transition metal atom and it has 4s¹3d¹⁰ electronic configuration, so it will loss 1 electron from the outermost shell and will form cation.Hence option (C) is correct i.e. Copper.
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- On a test, Helena is defining energy. Which must she include in order to get her answer marked correct?
○making objects more compact
O the ability to do work
O carrying through matter and space
O the bonds of atoms
Answer: Option 2, The ability to do work.
Explanation: Edge
Energy can be defined as:
B. the ability to do work, It can of many forms.
What is Energy?Energy is the capacity of an item to take care of business. It might exist in potential, motor, warm, electrical, substance, atomic, or other different structures. As per the work-energy hypothesis, the work done is put away in the energy of the body.
Thus, option B is correct.
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g Part A A Hofmann degradation of a primary amine forms an alkene that gives butanal and 2-methylpropanal upon ozonolysis and workup under reducing conditions. Identify the amine.
Answer:
Explanation:
When the primary amine undergoes Hofmann degradation it forms an Alkene
In this case the alkenes have undergone ozonolysis and has formed two products as butanal and 2-methyl propanal
when we revert back from these aldehydes to alkene we observed the alkene formed will be "2-methyl hept-3-ene " this alkene is the Hofmann product of that primary amine
upon addition of this alkene we observe the primary amine formed is
4-amino-2-methylheptane
Which of the following is not present in an atom? (1 point) Electron Element Neutron Proton
Answer:
Element is not present in an atom
Answer:
element
Explanation:
One method for removing hydrogen sulfide impurities from natural gas is by its reaction with oxygen at high temperatures to form sulfur and water vapor. After balancing the following equation, determine the coefficient in front of the reactant O2. H2S(g) + O2(g) → S8(l) + H2O(g) Group of answer choices
Answer:
4
Explanation:
H2S(g) + O2(g) → S8(l) + H2O(g)
Upon balancing the equation;
8H2S(g) + 4O2(g) → S8(l) + 8H2O(g)
The coefficient of O2 in the reaction above is 4.
Aqueous hydrochloric acid will react with solid sodium hydroxide to produce aqueous sodium chloride and liquid water . Suppose 30.3 g of hydrochloric acid is mixed with 25. g of sodium hydroxide. Calculate the minimum mass of hydrochloric acid that could be left over by the chemical reaction. Be sure your answer has the correct number of significant digits.
Answer:
[tex]m_{HCl}^{leftover}=7.50g[/tex]
Explanation:
Hello.
In this case, since the undergoing chemical reaction is:
[tex]HCl+NaOH\rightarrow NaCl+H_2O[/tex]
In order to identify the limiting reactant, we compute the available moles of sodium hydroxide (molar mass = 40 g/mol) and the moles of hydrochloric acid consumed by those moles via their 1:1 mole ratio considering the chemical reaction:
[tex]n_{HCl}=25.0gNaOH*\frac{1molNaOH}{40gNaOH} *\frac{1molHCl}{1molNaOH} =0.625molHCl[/tex]
Next, since the molar mass of hydrochloric acid is 36.46 g/mol, we compute the mass of that reactant that is actually consumed:
[tex]m_{HCl}=0.625molHCl*\frac{36.46gHCl}{1molHCl}=22.8gHCl[/tex]
In such a way, the leftover of HCl is:
[tex]m_{HCl}^{leftover}=30.3g-22.8g\\\\m_{HCl}^{leftover}=7.50g[/tex]
Best regards!
State yes no whether each of the following orbital diagrams conforms to the rules governing electron configuration if not explain what is wrong with the diagram
Answer:yes,no,no,yes
1. How are chemical bonds formed? *
Answer: Bonds form when atoms share or transfer valence electrons. Valence electrons are the electrons in the outer energy level of an atom that may be involved in chemical interactions. Valence electrons are the basis of all chemical bonds.
Explanation: Due to atoms and science ;)
Answer:
throught transferring or sharing an electron
Explanation:
a p e x :)))
The interaction of water droplets in rain with carbon dioxide that is naturally present in the atmosphere causes rain water to be slightly acidic because CO2 is an acidic anhydride. As a result, pure clean rain has a pH of about 5.7. What are the hydrogen ion and hydroxide ion concentration in this rain water
Answer:
Explanation:
pH = 5.7
- log [ H⁺ ] = 5.7
[ H⁻ ] = 10⁻⁵°⁷ M
= 2 x 10⁻⁶ M
[ H⁺ ] x [ OH⁻ ] = 10⁻¹⁴
2 x 10⁻⁶ x [ OH⁻ ] = 10⁻¹⁴
[ OH⁻ ] = .5 x 10⁻⁸ M
= 5 x 10⁻⁹ M
A student mixed 25 grams of salt into 1,000 grams of water.
What is the mass of the mixture?
A. 975 grams
B. 1,000 grams
C. 1,025 grams
D. 2,500 grams
The two main postulates that was given by Antoine Lavoisier are, oxygen play an important role in combustion and the other is mass of reaction is always conserved. Therefore, the mass of the mixture is 1025g. the correct option is option C.
What is law of conservation of mass?According to Law of conservation of mass, mass can neither be created nor be destroyed. Mass can only be transformed from one form to another. The law of conservation of mass was given by Antoine Lavoisier. Every reaction in nature follow the law given by Antoine Lavoisier that is mass is always conserved.
mass of salt+ mass of water=mass of solution
mass of salt =25 grams
mass of water=1,000 grams
substituting the given values, we get
25 grams+ 1,000 grams =mass of solution
mass of solution=1025g
Therefore, the mass of the mixture is 1025g. the correct option is option C.
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Based on these descriptions, write a balanced equation and the corresponding Kc expression for each reversible reaction.
a. Carbonyl fluoride, COF2(g), decomposes into gaseous carbon dioxide and gaseous carbon tetrafluoride.
b. Copper metal displaces Silver(I) Ion from aqueous solution , producing silver metal and an aqueous solution of copper(II) ion.
c. Peroxodisulfate ion , S2O82- , oxides iron (II) ion to iron (III) ion in aqueous solution and it is itself reduced to sulfate ion.
Answer:
See full explanation.
Explanation:
Hello.
In this case, since we apply the law of mass action in order to write the equilibrium expression for each chemical reaction, we proceed as follows:
a. The reaction is:
[tex]2COF_2(g)\rightleftharpoons CO_2(g)+CF_4(g)[/tex]
And the equilibrium expression:
[tex]Kc=\frac{[CO_2][CF_4]}{[COF_2]^2}[/tex]
Since all the species are in gaseous phase they are included on the equilibrium expression.
b. The reaction is:
[tex]Cu(s)+Ag^+(aq)\rightleftharpoons Ag(s)+Cu^{2+}(aq)[/tex]
And the equilibrium expression:
[tex]Kc=\frac{Cu^{2+}}{Ag^+}[/tex]
Since only copper (II) ions and silver (I) ions are in aqueous phase.
c. The reaction is redox and it turns out:
[tex](S_2O_8)^{2-}+Fe^{2+}\rightleftharpoons Fe^{3+}+(SO_4)^{2-}\\\\S_2^{7+}+2e^-\rightarrow 2S^{6+}\\\\2\times (Fe^{2+}\rightarrow Fe^{3+}+1e^-)\\\\\\(S_2O_8)^{2-}(aq)+2Fe^{2+}(aq)\rightleftharpoons 2Fe^{3+}(aq)+2(SO_4)^{2-}(aq)[/tex]
And the equilibrium expression:
[tex]Kc=\frac{[Fe^{3+}]^2[(SO_4)^{2-}]^2}{[(S_2O_8)^{2-}][Fe^{2+}]^2}[/tex]
Since all the species are in aqueous phase.
please help!! chemistry question
Answer:
9
Explanation:
Answer:
9
because i studied this