Answer:
Option A (They happen as the Sun hits its maximum and minimum level throughout the sky) is the correct option.
Explanation:
Solstice seems to be the moment whereas at noon this same sun achieved its maximum as well as minimum position, actually results throughout the year's shortest as well as biggest days. We currently believe that perhaps the solstice seems to be an apocalyptic event, exacerbated either by the tilt of the globe’s axis and therefore its direction of movement in an elliptical orbit. Globe's rotation not everyone's travel time from either the sun was what was causing winter or even just summer.Some other options given should not be in accordance with the given context. So, the correct approach would've been option A.
Answer:
A: They occur when the Sun reaches its highest or lowest point in the sky.
Edge 2022
have a good spring break!
Two 250 mL samples of water are drawn from a deep well bored into a large underground salt (NaCI) deposit Sample #1 is from the top of the well, and is initially at 42 °C. Sample #2 is from a depth of 150 m, and is initially at 8 °C. Both samples are allowed to come to room temperature (20 °C) and 1 atm pressure. An NaCI precipitate is seen to form in Sample # 1.
A. A bigger mass of NaCl precipitate will form in Sample #2.
B. A smaller mass of NaCl precipitate will form in Sample #2.
C. The same mass of NaCl precipitate will form in Sample #2.
D. No precipitate will form in Sample #2.
E. I need more information to predict whether and how much precipitate will form in Sample #2.
A student sees tiny bubbles clinging to the inside of an un-opened plastic bottle full of carbonated soft drink. The student opens the bottle, and hears a loud hiss as gas under pressure escapes from the bottle.
A. The bubbles will shrink, and some may vanish.
B. The bubbles will grow, and more may appear.
C. The bubbles won't change.
D. I need more information to predict what will happen to the bubbles.
Answer:
C. The same mass of NaCl precipitate will form in Sample #2.
B. The bubbles will grow, and more may appear.
Explanation:
Solubility refers to the amount of solute that dissolves in a solvent at a particular temperature. Solubility is temperature dependent. The solubility of various substances vary with temperature as depicted in solubility curves.
If we consider the solubility curve for sodium chloride, we easily notice that the solubility of NaCl is fairly independent of temperature. The solubility variation with temperature is flat meaning that an increase in temperature has relatively little effect on the solubility of NaCl, hence, the same mass of NaCl precipitate will form in Sample #2.
For the second question, we know that in a carbonated drink, carbon dioxide is present inside the bottle under pressure. Opening the bottle means that the pressure on the liquid suddenly decreases. Less carbon dioxide is now trapped at this lower pressure, hence the extra gas in the bottle is no longer dissolved in the liquid, consequently, more bubbles form in the system .
Homolysis, or homolytic bond dissociation, produces a very specific type of product under certain reaction conditions. In Part 1, select all the products (in formulae and general chemical terms) that could result from homolysis. In Part 2, select the reaction conditions that are most likely to promote homolysis.
Part 1. Choose all that may occur as possible products of a homolysis reaction.
Choose one or more:_______.
a. hydride ion
b. R3CO
c. Br2
d. H
e. a carbocation
f. H3C
g. H3CO-
h. hydrogen ion
i. a carbon free radical
Part 2. Choose the conditions under which homolysis is likely to occur.
Choose one or more:_______.
a. strong base
b. ultraviolet irradiation
c. high temperature
d. strong acid
e. infrared irradiation
f. low temperature
Answer:
1) R₃CO , H, H₃C, a carbon free radical
2) high temperature, ultraviolet irradiation
Explanation:
1) Homolysis leads to the formation of free radicals (species having a free electron). Thus, answer is :
R₃CO
H
H₃C
a carbon free radical
2) Homolysis require high temperature, ultraviolet irradiation.
Why is the separation of mixtures into pure or relatively pure substances so important when performing a chemical analysis?
Answer:
It is important to separate mixture into pure or relatively pure substances when performing a chemical analysis SO AS TO KNOW THE PROPERTIES COMING FROM EACH PART MIXTURE WHICH MAY INTERFERE WITH THE SEPARATION.
Explanation:
In chemistry, Mixture is the combination of two or more substances which are not combine chemically.
Mixture contain different substances with different physical and chemical properties.
It is important to purify the substances in a mixture so as to identify what properties are coming from each mixture and also some part of the mixture can interfere with the properties of other mixture present for skewing analysis.
Lithium crystallizes in a cubic unit cell with an edge length of 350. pm. If the density is 0.535 g/cm3, what type of cubic unit cell is seen in lithium
Answer:
Body-centered cubic
Explanation:
As the edge length of the cubic unit is 350pm, its volume is:
(350x10⁻¹²m)³ = 4.288x10⁻²⁹m³. In cm³
4.288x10⁻²⁹m³ ₓ ([100cm]³ / 1m³) = 4.288x10⁻²³cm³.
As the density of the structure is 0.535g/cm³, the mass of a cubic unir is:
4.288x10⁻²³cm³ ₓ (0.535g / cm³) = 2.29x10⁻²³g,
As atomic mass of Lithium is 6.941g/mol. Mass of 1 atom of Li is:
6.941g/mol ₓ 1mol / 6.022x10²³ atoms = 1.1526x10⁻²³ g / atoms.
Thus, atoms of Li in 2.29x10⁻²³g are:
2.29x10⁻²³g ₓ ( 1 atom / 1.1526x10⁻²³g) = 2 atoms in 1 cubic unit
In body-centered cubic unit cell, there are 2 atoms per cubic unit cell. Thus, structure of Li is:
Body-centered cubicThe density of a pure substance is its mass per unit volume. The density of cresol has been measured to be 1024 g/L . Calculate the mass of 405mL of cresol.
Answer: The mass of 405 ml of cresol is 415 grams
Explanation:
Density is defined as the mass contained per unit volume.
[tex]Density=\frac{mass}{volume}[/tex]
Given : Density of cresol = 1024 g/L
Volume of cresol = 405 ml = 0.405 L ( 1L=1000ml)
Putting in the values we get:
[tex]1024g/L=\frac{mass}{0.405L}[/tex]
[tex]mass=1024g/L\times 0.405L=415g[/tex]
Thus mass of 405 ml of cresol is 415 grams
Which example involves a phase change in which heat energy is released by the substance?
Ofreezing ice cream
O cooking a pot of soup
O melting ice under sunlight
O watching frost disappear into air
Answer:
Cooking a pot of soup
Explanation:
id say that because when you freeze ice cream, its already frozen, so no heat is being released. melting ice wouldn't be the answer because, once again, it is already frozen, and no heat is being released.
Answer:
the correct answer is freezing ice cream
Explanation:
i took the test & got this question correct. also, heat energy is released when freezing because there is no heat energy involved.
The percent errors of your experimental values of the specific heats may be quite large. Identify several sources of experimental error.
Answer:
The various sources of such errors are given below.
Explanation:
Sources of uncertainty or error could include necessary splattering of water leading to reduced cold water density as well as elevated temperatures of equilibration.The temperature might not have been reasonably stable when developers evaluated at every phase of the investigation or research.So that the percentage of someone specific produces heat exploratory value systems inaccuracies can be somewhat massive.
Determine the volume in mL of 0.37 M HClO4(aq) needed to reach the half-equivalence (stoichiometric) point in the titration of 20.8 mL of 0.51 M CH3CH2NH2(aq). Enter your answer with one decimal place. The Kb of ethylamine is 6.5 x 10-4.
Answer:
14.3mL you require to reach the half-equivalence point
Explanation:
A strong acid as HClO₄ reacts with a weak base as CH₃CH₂NH₂, thus:
CH₃CH₂NH₂ + HClO₄ → CH₃CH₂NH₃⁺ + ClO₄⁻
As the reaction is 1:1, to reach the equivalence point you require to add the moles of HClO₄ equal to moles CH₃CH₂NH₂ you add originally. Also, half-equivalence point requires to add half-moles of CH₃CH₂NH₂ you add originally.
Initial moles of CH₃CH₂NH₂ are:
20.8mL = 0.0208L × (0.51mol CH₃CH₂NH₂ / 1L) =
0.0106moles CH₃CH₂NH₂
To reach the half-equivalence point you require:
0.0106moles ÷ 2 = 0.005304 moles HClO₄
As concentration of HClO₄ is 0.37M, volume you require to add 0.005304moles is:
0.005304 moles HClO₄ ₓ (1L / 0.37mol) = 0.0143L =
14.3mL you require to reach the half-equivalence pointWhen The Kb of ethylamine is 6.5 x 10-4 is = 14.3mL you require to reach the half-equivalence point.
What is Ethylamine?
When A strong acid as HClO₄ reacts with a weak base as CH₃CH₂NH₂, Therefore:
Then CH₃CH₂NH₂ + HClO₄ → CH₃CH₂NH₃⁺ + ClO₄⁻
So when the reaction is 1:1, to reach the equivalence point then you instruct to that add the moles of HClO₄ equal to the moles CH₃CH₂NH₂ you add originally. Also, When the half-equivalence point requires you to add half-moles of CH₃CH₂NH₂ you add originally.
Then Initial moles of CH₃CH₂NH₂ are:
After that 20.8mL = 0.0208L × (0.51mol CH₃CH₂NH₂ / 1L) =
Then 0.0106moles CH₃CH₂NH₂To get the half-equivalence point you require is:
Then 0.0106moles ÷ 2 = 0.005304 moles HClO₄
After that As the concentration of HClO₄ is 0.37M, the volume you require to add 0.005304moles is:
Then 0.005304 moles HClO₄ ₓ (1L / 0.37mol) = 0.0143L =
Therefore, 14.3mL you require to reach the half-equivalence point.
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4. If 13 percent of the carbon-14 in a sample of cotton cloth remains, what's the approximate age of the cloth? Show your work
The approximate age of the cloth is 17190 years.
We'll begin by calculating the number of half-lives that has elapsed. This can be obtained as follow:
Original amount (N₀) = 100%Amount remaining (N) = 13%Number of half-lives (n) =?2ⁿ = 100 / 13
2ⁿ = 8
2ⁿ = 2³
n = 3
Finally, we shall determine the age of the cloth.
Half-life (t½) = 5730 yearsNumber of half-lives (n) = 3Time (t) =?t = n × t½
t = 3 × 5730
t = 17190 years
Thus, the approximate age of the cloth is 17190 years
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If 5.00 mL of a 0.5 M solution is diluted to a final volume of 100.0 mL, what is the concentration of the final dilute solution?
Answer:
0.025 M
Explanation:
The following data were obtained from the question:
Initial volume (V1) = 5 mL
Initial concentration (C1) = 0.5 M
Final volume (V2) = 100 mL
Final concentration (C2) =..?
Using the dilution formula, we can obtain the final concentration of the diluted solution as follow:
C1V1 = C2V2
0.5 x 5 = C2 x 100
Divide both side by 100
C2 = (0.5 x 5)/100
C2 = 0.025 M
Therefore, the final concentration of the diluted solution is 0.025 M
The concentration of the final diluted solution is 0.025M
The dilution formula is expressed according to the formula:
[tex]C_1V_1=C_2V_2[/tex]
Given the following parameters
[tex]C_1=0.5M\\V_1=5.00mL\\V_2=100.0mL\\C_2=?[/tex]
Substitute the given parameters into the formula:
[tex]C_1V_1=C_2V_2\\0.5(5)=100C_2\\2.5=100C_2\\C_2=\frac{2.5}{100}\\C_2= 0.025M[/tex]
Hence the concentration of the final diluted solution is 0.025M
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What is the Percent composition of a pure substance that contains 7.22g of nickel, 2.53g of phosphorus and 5.25 g oxygen
Answer:
Explanation:
Total mass of substance = 7.22 + 2.53 + 5.25 g
= 15 g
percentage of nickel = 7.22 x 100 / 15
= 48.13
= 48.1 %
percentage of phosphorus = 2.53 x 100 / 15
= 16.87%
= 16.9%
percentage of oxygen = 5.25 x 100 / 15
= 35 %
The percent composition of the pure substance should be 48.1%, 16.9%, and 35%.
Calculation of the percent composition:
Total mass of substance = 7.22 + 2.53 + 5.25 g
= 15 g
Now
percentage of nickel = 7.22 x 100 / 15
= 48.13
= 48.1 %
And,
percentage of phosphorus = 2.53 x 100 / 15
= 16.87%
= 16.9%
And, finally
percentage of oxygen = 5.25 x 100 / 15
= 35 %
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Which of the following is NOT one of the types of bonds? A. Ionic B. Metallic C. Covalent D. Valence
Considering the definition of bond and the different type of bonds, valence is not one of the types of bonds.
What is a chemical bondA chemical bond is defined as the force by which the atoms of a compound are held together. These are electromagnetic forces that give rise to different types of chemical bonds.
In other words, a chemical bond is the force that joins atoms to form chemical compounds and confers stability to the resulting compound.
Covalent bondThe covalent bond is the chemical bond between atoms where electrons are shared, forming a molecule. Covalent bonds are established between non-metallic elements, such as hydrogen H, oxygen O and chlorine Cl. These elements have many electrons in their outermost level (valence electrons) and have a tendency to gain electrons to acquire the stability of the electronic structure of noble gas. The shared electron pair is common to the two atoms and holds them together.
Ionic bondAn ionic bond is produced between metallic and non-metallic atoms, where electrons are completely transferred from one atom to another. During this process, one atom loses electrons and another one gains them, forming ions.
Metallic bondMetallic bonds are a type of chemical bond that occurs only between atoms of the same metallic element. In this way, metals achieve extremely compact, solid and resistant molecular structures, since the atoms that share their valence electrons.
SummaryIn summary, valence is not one of the types of bonds. The types of bonds are covalent, ionic and metallic.
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Select the correct answer
What determines the average kinetic energy of the particles in a gas?
ОА
the number of collisions
OB.
the number of particles
OC. the size of the particles
OD. the temperature
Answer:
Temperature
Explanation:
Kinetic energy of gass molecules is directly propotional to the temperature.
If solid ammonium fluoride (NH4F) is dissolved in pure water, will the solution be acidic, neutral, or basic?
Answer:
Dissolving NH4F in water will form a weak acidic solution.
Explanation:
That it is a weak acid solution means that it has a pH below 7 but close to the value, that is, it does not contain as many acids as those substances that are around a pH of 1 to 4, generally weak acids have a pH approximately 5 to 6
The solution of solid ammonium fluoride in pure water has been slightly acidic in nature.
Ammonium fluoride has been an ionic compound formed by the interaction of cationic ammonia and anionic fluoride ions. The dissolution of ionic compounds will result in the compound in its dissociated ionic state.
The dissociation results in the formation of ammonium cation. The ammonium has been a strong acid.
The resulted anion has been fluoride. It has been a strong base, but slightly weaker than ammonia.
Thus the resultant solution will result in slightly acidic nature.
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What is the mass of 1.56 X 10^24 formula units of Na2SO4?
Answer:
[tex]m=368 g[/tex]
Explanation:
Hello,
In this case, in order to compute the required mass, we first must notice that 6.022x10²³ formula units of sodium sulfate contain 1 mole of such compound (Avogadro's relationship). Moreover, one mole of sodium sulfate contains 142.04 g, which is in fact, the molar mass. Thereby, the required mass is computed via the following mole-mass-particles relationship:
[tex]m=1.56x10^{24}f.u*\frac{1mol}{6.022x10^{23}f.u}*\frac{142.04g}{1mol} \\\\m=368 g[/tex]
Regards.
Which of the following chemical equations is balanced? A. 4Fe+3O →2Fe O 2 23 B. 4Fe+2O →3Fe O 2 23 C. 3Fe+3O →3Fe O D. 2Fe+O →Fe O 2 23
Answer: [tex]4Fe+3O_2\rightarrow 2Fe_2O_3[/tex]
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
The balanced chemical equation is:
[tex]4Fe+3O_2\rightarrow 2Fe_2O_3[/tex]
Thus in the reactants, there are 4 atoms of iron and 6 atoms of oxygen.Thus there will be 4 atoms of iron, and 6 atoms of oxygen in the product as well.
how many calories are in a 50g package of peanuts
Answer:
284 calories
Explanation:
There are 284 calories in 50 grams of peanuts.
Calorie breakdown: 73% fat, 11% carbs, 17% protein.
help please i have 5 minutes to do this !!!
Answer:
A) One that occurs on its own
How did Ernest Rutherford change the atomic model?
A. He showed that the atom could be divided into smaller particles.
B. He showed that electrons were located within an atom's nucleus.
C. He showed that the atom contained both positive and negative
charges
D. He showed that most of an atom's mass was located in the atom's
nucleus.
Answer:
D. He showed that most of an atom's mass was located in the atom's
nucleus.
Explanation:
Ernest Rutherford changed the atomic model because of his experiment which was the gold foil experiment. A beam of alpha particles was aimed at a piece of gold foil, most particles passed through but some were scattered backward which showed that the middle of an atom (nucleus) is the where most of the mass is located.
Rutherford's model of atoms is the improved version of Thomson's model. In the model, it is stated that most of an atom's mass is located in the nucleus. Thus, option D is correct.
What is Rutherford's model?Ernest Rutherford gave the improved atomic model that postulated the failure of Thomson's model. Rutherford's model described the atom to consist of a sub-atomic particle with a positively charged nucleus.
The nucleus is in the center of the atom and had nearly all mass concentrated in it due to the presence of the protons and neutrons. The electrons were called negatively charged species that were present in the shells around the nucleus like the planets around the Sun.
Therefore, Rutherford's model showed mass concentrated in the center of the nucleus.
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A 5.024 mg sample of an unknown organic molecule containing carbon, hydrogen, and nitrogen only was burned and yielded 13.90 mg of CO2 and 6.048 mg of H2O. What is the empirical formula
Answer:
C8H17N
Explanation:
Mass of the unknown compound = 5.024 mg
Mass of CO2 = 13.90 mg
Mass of H2O = 6.048 mg
Next, we shall determine the mass of carbon, hydrogen and nitrogen present in the compound. This is illustrated below:
For carbon, C:
Molar mass of CO2 = 12 + (2x16) = 44g/mol
Mass of C = 12/44 x 13.90 = 3.791 mg
For hydrogen, H:
Molar mass of H2O = (2x1) + 16 = 18g/mol
Mass of H = 2/18 x 6.048 = 0.672 mg
For nitrogen, N:
Mass N = mass of unknown – (mass of C + mass of H)
Mass of N = 5.024 – (3.791 + 0.672)
Mass of N = 0.561 mg
Now, we can obtain the empirical formula for the compound as follow:
C = 3.791 mg
H = 0.672 mg
N = 0.561 mg
Divide each by their molar mass
C = 3.791 / 12 = 0.316
H = 0.672 / 1 = 0.672
N = 0.561 / 14 = 0.040
Divide by the smallest
C = 0.316 / 0.04 = 8
H = 0.672 / 0.04 = 17
N = 0.040 / 0.04 = 1
Therefore, the empirical formula for the compound is C8H17N
Silver crystallizes in a face-centered cubic structure. What is the edge length of the unit cell if the atomic radius of silver is 144 pm?
Answer:
Edge length of the unit cell is 4.07x10⁻¹⁰m
Explanation:
In a face-centered cubic structure, the edge, a, could be obtained using pythagoras theorem knowing the hypotenuse of the unit cell, b, is equal to 4r:
a² + a² = b² = (4r)²
2a² = 16r²
a = √8 r
That means edge lenght is = √8 r
adius
As radius of Silver is 144pm = 144x10⁻¹²m:
a = √8 r
a = √8 ₓ 144x10⁻¹²m
a = 4.07x10⁻¹⁰m
Edge length of the unit cell is 4.07x10⁻¹⁰mThe element potassium forms a _______ with the charge . The symbol for this ion is , and the name is . The number of electrons in this ion is
Answer:
The element potassium forms a cation with the charge +1 . The symbol for this ion is K⁺, and the name is potassium ion. The number of electrons in this ion is 18.
Explanation:
Potassium is a metal. It belongs to the group 1 elements. Metals form cations by losing electrons. Since potassium is a group element, it forms a cation by losing one electron. The charge it has is +1 due to the excess of the protons compared t the electrons by 1.
Potassium has 19 electrons. Potassium io on the other hand has 19-1 = 18 electrons.
The half-life of element X is 500 years. If there are initially 8 g of X, how much will remain after 1500 years
Answer:
1 g
Explanation:
From the formula;
N/No = (1/2)^t/t1/2
Where;
N= mass of radioactive element left after a time t = the unknown
No= mass of radioactive element originally present in the sample = 8g
t= time taken for N mass of the sample to remain = 1500
t1/2= half-life of the radioactive element = 500 years
Substituting values, we have;
N/8 = (1/2)^1500/500
N/8 = (1/2)^3
N/8 = 1/8
N= 1/8 ×8
N= 1 g
Therefore; mass of radioactive element left after 1500 years is 1 g
4Ga + 3S2 → 2Ga2S3
1. How many grams of Gallium burned if 200.0 grams of Gallium(III)Sulfide formed?
Answer:
118.4 g
Explanation:
4 Ga + 3 S₂ → 2 Ga₂S₃
According to the equation, for every 4 moles of gallium burned, 2 moles of gallium(III) sulfide.
First, convert grams of Ga₂S₃ to moles. The molar mass is 235.641 g/mol.
(200.0 g)/(235.641 g/mol) = 0.8487 mol
Use the relationship above to convert moles of Ga₂S₃ to moles of Ga.
(0.8487 mol Ga₂S₃) × (4 mol Ga)/(2 mol Ga₂S₃) = 1.697 mol Ga
Convert moles of Ga to grams. The molar mass is 69.723 g/mol.
(1.697 mol Ga) × (69.723 g/mol) = 118.4 g
When silver nitrate is added to the Fe/SCN equilibrium, why is the colorless intense and a precipitate forms?
Answer:
Here's what I get
Explanation:
You have an equilibrium reaction between Fe³⁺/ SCN⁻ and FeSCN²⁺.
[tex]\underbrace{\hbox{Fe$^{3+}$}}_{\text{pale yellow-green}} +\underbrace{\hbox{SCN$^{-}$}}_{\text{colourless}} \, \rightleftharpoons \, \underbrace{\hbox{Fe(SCN)$^{2+}$}}_{\text{deep blood red}} \\[/tex]
When you add AgNO₃, the Ag⁺ reacts with the SCN⁻. It forms a colourless precipitate of Ag(SCN).
Ag⁺(aq) + SCN⁻(aq) ⟶ AcSCN(s)
According to Le Châtelier's Principle, when we apply a stress to a system at equilibrium, the system will respond in a way that tends to relieve the stress.
If you add Ag⁺ to the equilibrium solution, it removes the SCN⁻ [as an Ag(SCN) precipitate].
The system responds by trying to replace the missing SCN⁻:
The Fe(SCN)²⁺ dissociates to form SCN⁻, so the position of equilibrium shifts to the left,
You now have more Fe³⁺ and SCN⁻ and less of the highly coloured Fe(SCN)²⁺ at the new equilibrium.
The deep red colour becomes less intense.
When silver nitrate is added to the Fe/SCN equilibrium, the colourless intense and precipitate forms because it settles at the bottom.
What is chemical equilibrium?Chemical equilibrium is the condition in the course of a reversible chemical reaction in which no net change in the amounts of reactants and products occurs.
The added silver nitrate, [tex]AgNO_3[/tex] , effectively removes thiocyanate ions, [tex]SCN^{-1}[/tex], from the equilibrium system via a precipitation reaction when the [tex]Ag^{+1}[/tex] combines with [tex]SCN^{-1}[/tex] to produce insoluble silver thiocyanate, AgSCN, which settles to the bottom of the test tube.
Ag⁺(aq) + SCN⁻(aq) ⟶ AcSCN(s)
According to Principle, when we apply stress to a system at equilibrium, the system will respond in a way that tends to relieve the stress.
Adding Ag⁺ to the equilibrium solution, it removes the SCN⁻ [as an Ag(SCN) precipitate].
The system responds by trying to replace the missing SCN⁻:
The Fe(SCN)²⁺ dissociates to form SCN⁻, so the position of equilibrium shifts to the left,
You now have more Fe³⁺ and SCN⁻ and less of the highly coloured Fe(SCN)²⁺ at the new equilibrium.
The deep red colour becomes less intense.
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The vapor pressure of pure water at 85oC is 434 torr. What is the vapor pressure at 85oC of a solution prepared from 100 mL of water (density 1.00 g/mL) and 150 g of diglyme, C6H14O3, a nonvolatile substance?
Answer:
[tex]P=361.2torr[/tex]
Explanation:
Hello,
In this case, considering that the formed liquid is solution is ideal, we can relate the vapor pressure and molar fraction of water with the total vapor pressure of the solution by using the Dalton's equilibrium-based law:
[tex]P=x_{H_2O}P_{H_2O}^v[/tex]
In such a way, we compute the molar fraction of water by computing its moles as well as diglyme:
[tex]n_{H_2O}=100mL*\frac{1g}{1mL} *\frac{1mol}{18g} =5.56molH_2O\\\\n_{C_6H_{14}O_3}=150g*\frac{1mol}{134g}=1.12molC_6H_{14}O_3[/tex]
Thus, the mole fraction of water:
[tex]x_{H_2O}=\frac{5.56mol}{5.56mol+1.12mol}=0.832[/tex]
Thereby, the vapor pressure of the solution:
[tex]P=0.832*434torr\\\\P=361.2torr[/tex]
Regards.
The vapor pressure of the pure water with diglyme has been 361.28 torrs.
Vapor pressure of a solution can be given by :
Vapor pressure = Mole fraction of solvent [tex]\times[/tex] Vapor pressure of the pure solvent
The pure solvent has been pure water.
The vapor pressure of pure water = 434 torr.
The mole fraction of the solvent can be given as:
Mole fraction of solvent = [tex]\rm \dfrac{Moles\;of\;solvent}{Moles\;of\;solution}[/tex]
The solvent has been water. The density of water has been 1g/ml. It states that the mass of the 1 ml sample is 1 gram.
Mass of 100 ml water sample = 100 grams
Moles can be expressed as:
Moles = [tex]\rm \dfrac{weight}{molecular\;weight}[/tex]
Moles of solvent (water) = [tex]\rm \dfrac{100}{18}[/tex]
Moles of solvent (water) = 5.55 mol.
The moles of solute (Diglyme) can be given as:
Moles of solute (Diglyme) = [tex]\rm \dfrac{150}{134.17}[/tex]
Moles of solute (Diglyme) = 1.117 mol.
The moles of solution = Solvent + solute
The moles of solution = 5.55 + 1.117 mol
The moles of solution = 6.667 mol.
The mole fraction of the solvent has been;
Mole fraction of solvent = [tex]\rm \dfrac{5.55}{6.667}[/tex]
Mole fraction of solvent = 0.832
The vapor pressure of the solution will be:
Vapor pressure = 0.832 [tex]\times[/tex] 434 torr
The vapor pressure of the solution = 361.28 torrs.
The vapor pressure of the pure water with diglyme has been 361.28 torrs.
For more information about the vapor pressure, refer to the link:
https://brainly.com/question/13423145
When 75.5 grams of phosphorus pentachloride react with an excess of water, as shown in the unbalanced chemical equation below, how many moles of hydrochloric acid will be produced? Please show all your work for the calculations for full credit. PCl5 + H2O --> H3PO4 + HC
Answer:
Explanation: M(PCL5)= 31 + 5(35.5)
=208.5g/mol
M(H20)= 18g/mol
n(PCL5) = 75.5÷208.5
= 0.362mol
n(HCl)/n(PCL5)= 5/1
n(HCl)= 5×0.362
=1.81mol of HCl
Write the balanced equation for the half reaction for the single replacement
reaction involving iron. This equation considers only the iron cations and the
elemental iron, and it shows how the iron cation (Fe3+) is reduced to become
elemental iron (Fe). How many electrons are represented in this equation? How
does this number of electrons help show a balance of charge on both sides of the
equation? (3 points)
Answer:
Explanation:
The half reaction required
Fe⁺³ + 3 e = Fe
This is a balanced equation
No of atom of Fe on both side = 1
Total charge on the left side = + 3 - 3 = 0
Total charge on the right = 0
three electrons will be required to neutralise +3 charge on the single iron ion .
1. What form of matter is made from only one type of atom?
A molecule
B compound
C element
6.66%
D material
Answer:
A molecule is the answer.
If 3.10 moles of P4010 reacted with excess water, how many grams of H3PO4
would be produced?
P4010 +6H20 + 4H3PO4
You Answered
126 g
0 0.007918
Correct Answer
O 1220 g
0.1278
75.98
Answer:
1.22 × 10³ g
Explanation:
Step 1: Write the balanced equation
P₄O₁₀ + 6 H₂O ⇒ 4 H₃PO₄
Step 2: Calculate the moles of H₃PO₄ produced by 3.10 moles of P₄O₁₀
The molar ratio of P₄O₁₀ to H₃PO₄ is 1:4. The moles of H₃PO₄ produced are 4/1 × 3.10 mol = 12.4 mol
Step 3: Calculate the mass corresponding to 12.4 moles of H₃PO₄
The molar mass of H₃PO₄ is 97.99 g/mol.
[tex]12.4 mol \times \frac{97.99g}{mol} = 1.22 \times 10^{3} g[/tex]