Answers
The formatted answer to the question is below.Energy required to boil hexane is 80kj
From the question, the parameters given are 64.7g of hexane,C6H14; a starting temperature of 41.9°C and bringing it to 33.2°C.
Molar mass of hexane,C6H14=86.18g/mol.
Things to know: heat capacity of hexane, C6H14= 142.6J/molK, the heat of fusion = 9.87 kj/mol.
STEP ONE(1): ENERGY USED IN MELTING HEXANE SOLID.
Using the formula below;
Energy used in melting the solid(in JOULES) = (mass of hexane/molar mass of hexane) × heat of Fusion.
=(64.7g of C6H14/86.18(g per mol) of C6H6) × 9.87 kJ per mol.
= 7.40J.
= 0.0074 kJ.
STEP TWO (2): ENERGY OF HEATING THE LIQUID.
It can be calculated from the formula below;
Energy= heat capacity (J/g.K) × mass of hexane× (∆T).
= 142.6J/molK × 64.7× (41.9-33.2).
= 80268.114
= 80.268 kJ.
Energy required to boil hexane= Energy required to melt the hexane + energy required for boiling.
= 0.0074 kJ.+80.268 kJ.
= 80.27kJ
Approximately, 80kJ
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Related Questions
When a solution of sodium hydroxide is mixed with iron (II) chloride, a green precipitate is formed. What is the balanced equation for that reaction?
Answers
The balanced chemical equation for the reaction is:
2NaOH(aq) + FeCl₂(aq) --> 2NaCl(aq) + Fe(OH)₂(s)
What is a chemical equation?Chemical equations are representations of chemical reactions using symbols and formula of the reactants and products.
The reactants are located on the left side while the products are located on the right side.
Reactants —> Products
The balancing of chemical equations follows the law of conservation of matter which states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.
How to write the balanced equationSodium hydroxide => NaOH
Iron (II) chloride => FeCl₂
2NaOH(aq) + FeCl₂(aq) --> 2NaCl(aq) + Fe(OH)₂(s)
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Which element needs 3 valence electrons to complete its octet?
Answers
Answer: Gallium
Explanation:
Pl help it’s for homwork
Answers
Explanation:
i know you mart... you go to my school
Uh yah I’ll give you the crown thingy! And extra points:)
Answers
has many layers
formed from material that was eroded
includes fine particles of sand
Which statement best describes the structure of a lipid molecule?
A phospholipid has a charged head and an uncharged tail.
A lipid is made up of a long chain of phosphorus molecules.
Lipids contain proteins and glycerol.
The ends of the lipid are attached to each other.
Answers
A phospholipid has a charged head and an uncharged tail.
4. Long answer type questions: a. b. C. d. e. f. g. h. j. i. What are the constituent gases of air? Why is the surrounding air not seen with the eyes? How do you prove that air supports burning? How do you show that air occupies space? How do you prove that air has weight? How is air useful to us? Mention any three points. Write any three properties of air. How can you say that air exerts force? Write any four effects of air pollution. Write any three causes of air pollution and any two control measures of it.
Answers
1. The constituent gases of air are:
Nitrogen Oxygen Argon Carbon Dioxide2. The surrounding air is not seen with the eyes because it is transparent. Air molecules are not visible to the na-ked eye, and they do not scatter or absorb visible light significantly. Therefore, air appears colorless and transparent.
What is air?3. To prove that air supports burning, you can perform an experiment with a burning candle. Place a glass jar or bell jar over a lit candle, ensuring that the jar is airtight. As the candle burns, it consumes oxygen from the air inside the jar. Eventually, the candle flame will go out due to the lack of oxygen, proving that air (specifically oxygen) is necessary for burning.
4. To show that air occupies space, you can perform a simple experiment using a plastic bottle or syringe. Fill the bottle or syringe with water, ensuring there are no air bubbles. Then, cover the opening tightly and try to compress the air inside. You will find that it is not possible to compress the air significantly, indicating that air occupies space.
5. To prove that air has weight, you can use a sensitive balance or scale. Weigh an airtight container or balloon, and then fill it with air. The weight of the container or balloon with the added air will be greater than its initial weight, demonstrating that air has weight.
6. Air is useful to us in various ways. Three points highlighting the importance of air are:
Breathing and RespirationCombustion and Energy ProductionClimate Regulation7. Three properties of air include:
Air is Compressible: Air can be compressed or expanded under different conditions, allowing it to fill various spaces and containers.Air has Mass: Air molecules have mass, which means air itself has weight. It exerts pressure on objects and surfaces.Air Exerts Pressure: Due to the collisions of air molecules with surfaces, air exerts pressure in all directions. This pressure is known as atmospheric pressure.Air exerts force in various ways. For example, air pressure allows objects like airplanes to fly by providing lift. Air resistance or drag opposes the motion of objects moving through the air, creating a force that can affect their speed and trajectory.
8. Four effects of air pollution include:
Respiratory ProblemsEnvironmental Damage:Climate ChangeHuman Health Impacts9. Causes of pollution:
Industrial EmissionsVehicle EmissionsResidential and Agricultural Activities10. Two control measures for air pollution include:
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characteristics. of. rusting
Answers
Answer: metal turn orange and weaker as it gets oxidised
Explanation:
Question Completion Status:
QUESTION 4
(02.01 LC)
What is true of neutrons? (3 points)
They have no charge and are located inside the nucleus.
They have no charge and are located outside the nucleus.
They are negatively charged and are located inside the nucleus.
They are negatively charged and are located outside the nucleus.
Answers
Answer:
Ion know
Explanation:
Answer:
A.
They have no charge and are located inside the nucleus.
Explanation: It is true that neutrons have no charge, but they do have mass. The neutron does not exist outside the atomic nucleus.
A 20 g gold coin is heated from 10°C to 50°C ( CAu is 0.13 J/g−°C ). What is the △H ? (Hint: Remember ΔH=q, so if you solve for q, you might have your answer!)
Answers
Now
\(\\ \rm\rightarrowtail Q=mc\delta T\)
\(\\ \rm\rightarrowtail Q=20(40)(0.13)\)
\(\\ \rm\rightarrowtail Q=800(0.13)\)
\(\\ \rm\rightarrowtail Q=104J\)
1. A rocket can be powered by the given reaction: N₂O4(1)+2N2H4(1)→ 3N2(g) + 4H₂O(g). An engineer designed the rocket to hold 1.00 kg of N₂O4 and excess N₂H4. [N 14.007 amu; H 1.008 amu; O 15.999 amu] (1000 g = 1kg) a) Given the balanced chemical equation above, what is the mole relationship between N₂O4 and N₂ ? (3 pts) N₂O +z M >N₂) 1/ b) How much N₂ would be produced with the 750 g N₂O4? (10 pts) c) If 650 g of N₂ was obtained, what is the percent yield?
Show work please
Answers
According to the balanced reaction, one mole of N₂O₄ produce 3 moles of N₂. Thus 750 g of N₂O₄will produce 684.7 g of N₂. If the actual yield of N₂ is 650 g, the percent yield is 94.9 %.
What is percent yield?The percent yield of a reaction is the ratio of actual yield to the theoretical yield multiplied by 100.
According to the given balanced reaction, one mole of N₂O₄ produce 3 moles of N₂. The molar mass of N₂O₄ is 92 g/mol and the molar mass of 3 moles of N₂ is 84 g. Thus 92 g of N₂O₄ produce 84 g of N₂.
The mass of N₂ produced from 750 g of N₂O₄ is then calculated as follows:
mass of N₂ = ( 750 × 84 /92)
= 684.7 g.
The actual yield of N₂ is given 650 g. Thus the percent yield of N₂ is calculated as:
Percent yield = (650 / 684.7) × 100
= 94.9 %.
Hence, the amount of N₂ produced from 750 g of N₂O₄ is 684.7 g and the percent yield is 94.9%.
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A
is useful in explaining current behavior and predicting future behavior.
Answers
Psychology is useful in explaining current behavior and predicting future behavior.
What is psychology?Psychology is an empirical investigation of the intellect and conduct, encompassing a vast scope of subjects such as cognitive processes, affective states, volition, individual traits, and interpersonal dynamics.
Psychologists employ a diverse array of approaches to examine behavior, including careful observation, in-depth interviews, comprehensive surveys, and controlled experiments.
By discerning the underlying determinants, psychology serves as a tool to elucidate present conduct. These determinants may involve biological, psychological, and sociocultural influences.
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An average reaction rate is calculated as the change in the concentration of reactants or products over a period of time in the course of the reaction. An instantaneous reaction rateis the rate at a particular moment in the reaction and is usually determined graphically.
The reaction of compound A forming compound B was studied and the following data were collected:
Time (s) [A] (M)
0. 0.184
200. 0.129
500. 0.069
800. 0.031
1200. 0.019
1500. 0.016
Part A: What is the average reaction rate between 0. and 1500. s? Express your answer to three significant figures and include the appropriate units.
Part B: What is the average reaction rate between 500. and 1200. s ? Express your answer to three significant figures and include the appropriate units.
Part C: What is the instantaneous rate of the reaction at t=800. s? Express your answer to two significant figures and include the appropriate units.
Answers
The average reaction rate between 0 and 1500 s is -0.000105 M/s and the average reaction rate between 500 and 1200 s is -0.0000571 M/s
Part A: To calculate the average reaction rate, we can use the formula:
Average rate = (change in concentration)/(change in time)
The change in concentration of A is [A]t - [A]0, and the change in time is t - 0. Using the given data, we get:
Average rate = ([A]1500 - [A]0)/(1500 - 0) = (0.016 - 0.184)/(1500) = -0.000105 M/s
Therefore, the average reaction rate between 0 and 1500 s is -0.000105 M/s.
Part B: Following the same formula as above, we can calculate the average rate between 500 and 1200 s using the given data:
Average rate = ([A]1200 - [A]500)/(1200 - 500) = (0.031 - 0.069)/(700) = -0.0000571 M/s
Therefore, the average reaction rate between 500 and 1200 s is -0.0000571 M/s.
Part C: The instantaneous rate at t=800 s can be determined by drawing a tangent to the concentration vs. time plot at that point and finding its slope.
From the given data, we can plot [A] vs. time and draw a tangent at t=800 s
The slope of this tangent gives us the instantaneous rate at that point. Using a straight edge or ruler, we can estimate the slope to be approximately -0.0000575 M/s.
Therefore, the instantaneous rate of the reaction at t=800 s is approximately -0.0000575 M/s.
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3. A Wilkinson’s catalyst is widely used in the hydrogenation of alkenes. Show a catalytic cycle, including: i. chemical structure of the catalyst, with complete stereochemistry ii. molecular geometry of catalyst iii. type of reactions involved iv. the appropriate starting material, reagent and solvent v. major and minor end-products vi. all intermediates, for each reaction stated in (iii)
Answers
We can see here that the catalytic cycle for the hydrogenation of alkenes using Wilkinson's catalyst involves several steps.
What are the steps involved?Here's an overview of the catalytic cycle, including the necessary details:
i. Chemical structure of the catalyst:
Wilkinson's catalyst, also known as chloridotris(triphenylphosphine)rhodium(I), has the following chemical structure: [RhCl(PPh3)3]
ii. Molecular geometry of the catalyst:
The Wilkinson's catalyst has a trigonal bipyramidal geometry around the rhodium center. The three triphenylphosphine (PPh3) ligands occupy equatorial positions, while the chloride (Cl) ligand occupies an axial position.
iii. Type of reactions involved:
The catalytic cycle involves several reactions, including:
Oxidative addition: The rhodium center undergoes oxidative addition, reacting with molecular hydrogen (H2) to form a dihydride intermediate.Alkene coordination: The alkene substrate coordinates to the rhodium center, forming a π-complex.Hydrogenation: The coordinated alkene undergoes hydrogenation, resulting in the addition of hydrogen atoms to the double bond and formation of a metal-alkyl intermediate.Reoxidation: The metal-alkyl intermediate reacts with a hydrogen molecule to regenerate the rhodium dihydride species.iv. Starting material, reagent, and solvent:
The starting material is an alkene, and the reagent is Wilkinson's catalyst ([RhCl(PPh3)3]). The reaction is typically carried out in a suitable solvent, such as dichloromethane (CH2Cl2) or tetrahydrofuran (THF).
v. Major and minor end-products:
The major end-product of the hydrogenation reaction is the fully saturated alkane, resulting from the addition of hydrogen across the double bond. The minor end-product may include cis- or trans-configured alkanes if the original alkene substrate possesses geometric isomers.
vi. Intermediates:
The intermediates in the catalytic cycle include:
Rhodium dihydride complex: [RhH2(PPh3)3]Alkene-Rhodium π-complex: [Rh(η2-alkene)(PPh3)3]Metal-alkyl intermediate: [Rh(alkyl)(PPh3)3]These intermediates play a crucial role in facilitating the hydrogenation reaction and enabling the catalytic cycle to proceed.
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Which subatomic particle is used to identify the atom, as it never changes?
Protons
Electrons
Neutrons
Nucleus
Answers
You have 400,000 atoms of a radioactive substance. After 3 half-lives have past, how many atoms remain? Remember that you cannot have a fraction of an atom, so round the answer to the nearest whole number.
Answers
Answer:
Explanation:
The number of atoms that remains after 3 half-lives given that it was originally 300000 atoms is 37500 atoms
Data obtained from the question
Original amount (N₀) = 300000 atoms
Number of half-lives (n) = 3
Amount remaining (N) =?
How to determine the amount remaining
The amount remaining after 3 half-lives can be obtained as illustrated below:
N = N₀ / 2ⁿ
N = 300000 / 2³
N = 300000 / 8
N = 37500 atoms
what is a arieal animals?
Answers
Please answer my question.
Answers
The major organic product of the given reaction is buten-2-one. Its structure is attached in image below. Therefore, option III is correct.
What is hydration ?A chemical reaction is a hydration reaction. Water is one of the reactants converted into products. The hydration of alkenes to produce alcohols is one of the most common hydration reactions. The hydration of ethene, for example, produces industrial ethanol.
Hydration of alkynes by H₂SO₄ and HgSO₄ considers the addition reaction following Markovnikov's rule. Addition here is two times and the water get take away from the carbon resulting formation of buten-2-one as product.
Thus, option III is correct.
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help me i will give brainly
Answers
Answer:Pretty Big Lol
Explanation:
When a cold tire is inflated to a certain pressure and then is warmed up due to
friction with the road, the pressure
increases.
This happens because the...
...air molecules hit the walls of the tire less frequently.
...air molecules speed up and collide with the tire walls more often.
...rubber in the tire reacts with oxygen in the atmosphere.
...air molecules diffuse rapidly through the walls of the tire.
Answers
The correct option is B.
Air molecules speed up and collide with the tire walls more often.
When a cold tire is loaded to a certain pressure, the pressure rises as the tire heats up due to friction with the road. The increase in speed and frequency of the air molecules' collisions with the tire walls causes this to happen. The air inside the tire becomes warmer due to contact with the road. Charle's law states that a rise in heat causes an increase in pressure.
The air in your tires expands more in hot weather and contracts more in cold weather, depending on the temperature. The computer in your automobile, therefore, thinks that your tires are low on air when the temperature drops. The inflation pressure in tires normally declines by 1 to 2 psi for every 10 degrees as the temperature dips.
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In a laboratory experiment a student found the pH of rain rain water sample to be 4.35 calculate H3O+ in the rainwater
Answers
The rainwater sample has a pH of 4.35, indicating that it is acidic. The concentration of \(H_3O^+\) ions in the sample is \(4.47 * 10^{-5} M\), which is higher than in neutral or basic solutions.
In a laboratory experiment, a student found the pH of a rainwater sample to be 4.35. In this context, the task is to calculate the concentration of hydronium ions (\(H_3O^+\)) in the given rainwater sample. The pH of the rainwater sample is an indication of how acidic it is. As per the pH scale, acidic solutions have a pH of less than 7. Since the pH of rainwater is acidic (pH = 4.35), it means that the concentration of \(H_3O^+\) ions is higher in the rainwater sample. To calculate the concentration of \(H_3O^+\) ions, we can use the following formula: pH = -log[\(H_3O^+\)], Where[\(H_3O^+\)] is the concentration of hydronium ions. By rearranging the above formula, we can get the concentration of \(H_3O^+\) ions as \([H_3O^+] = 10^{-pH}\). Substituting the given pH value of the rainwater sample in the above equation, we get\([H_3O^+] = 10^{-4.35} = 4.47 × 10^{-5} M.\)Therefore, the concentration of \(H_3O^+\) ions in the given rainwater sample is \(4.47 * 10^{-5} M.\)For more questions on acidic
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Which of the physical processes below result in the formation of metamorphic rocks
Answers
i dont see any processes below
Answer:
Heat and pressure
Explanation:
got it on study island
NEED ASAP!
What is the resolution of a monochromator, Δλeff, with a exit slit width of 500 micrometers and a \(D^{-1}\) of 1.8 nm/mm? Express the answer in nm.
Answers
The resolution of the monochromator is 3.6nm
What is a MonochromatorA monochromator is an optical device that is used to isolate a specific wavelength or range of wavelengths of light from a broader spectrum of light. It is typically used in spectroscopy, where the goal is to measure the intensity of light at a specific wavelength or over a range of wavelengths.
The resolution of a monochromator, Δλeff, is given by the equation: Δλeff = (D^-1) * (exit slit width)
Plugging in the given values:
Δλeff = (1.8 nm/mm) * (500 micrometers)
Converting micrometers to millimeters:
Δλeff = (1.8 nm/mm) * (0.5 mm)
Δλeff = 3.6 nm
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Help please due today
Answers
Answer:
It is a becaues i am a doctor and i know about that
Explanation:Just here to help
A gas has a solubility of 0.66 g/L at 10.0 atm. What is the pressure on a 1.0 L samples that contains 1.5 g of gas
Answers
Answer:
"22.73 atm" is the correct answer.
Explanation:
Given:
Solubility,
\(S_1=0.66 \ g/L\)
\(S_2=1.5 \ g/L\)
Pressure,
\(P_1=10.0 \ atm\)
\(P_2=?\)
By using Henry's law,
⇒ \(\frac{S_1}{P_1} =\frac{S_2}{P_2}\)
or,
⇒ \(P_2=\frac{S_2 P_1}{S_1}\)
By putting the values, we get
⇒ \(=\frac{1.5\times 10.0}{0.66}\)
⇒ \(=\frac{15}{0.66}\)
⇒ \(=22.73\ atm\)
Which explains why mixtures can be separated
Answers
Answer: A: the components have different properties
Explanation:
The guy above is wrong I’m right got it correct on my unit review on edge
Answer:
A.
Explanation:
Draw the Lewis electron dot
structure for COCI2.
What is the VSEPR shape of this
particle? PLS HELP
Answers
Answer:
Idon't know if this helps but I think it is a linear structure and if I am wrong I am so sorry
Based on the activity series you created in part C, predict whether there would be a chemical
reaction or no reaction when the listed pairs of substances are combined.
BI U X
X Х.
Font Sizes
А -
А
EEE 를 들 들
Substances
Reaction or No
Reaction
I
magnesium and copper(1)
sulfate
iron and magnesium sulfate
copper and iron(III) nitrate
magnesium and hydrochloric
acid
Answers
Answer:
first one is no reaction and the rest are reaction
Explanation:
Consider the following reaction at 298K.
I2 (s) + 2 Cr2+ (aq) 2 I- (aq) + 2 Cr3+ (aq)
Which of the following statements are correct?
Choose all that apply.
n = 4 mol electrons
Eo cell < 0
delta G^o < 0
The reaction is reactant-favored.
K > 1
Answers
The true statements are;
ΔG < 0K > 1What are the correct statements?Now we can see that the reaction here is a redox reaction. Thus;
Eocell = cell potential = 0.54 - (-0.41) = 0.95 V
K = equilibrium constant = ?
n = number of moles of electrons = 2
ΔG = change in free energy = ?
Hence;
Eocell = 0.0592/n log K
0.95 = 0.0592/2 log K
K = 0.95 * 2/0.0592
K = 1.2 * 10^32
Now
ΔG = -nFEcell
ΔG = - (2 * 96500 * 0.95)
ΔG = -183.3kJ
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Sodium gives up the single electron in its outer shell in a reaction leaving it with 11 protons and 10 electrons
True or false?
Answers
A certain compound is 66.7% carbon, 3.74% hydrogen, and 29.6% oxygen. Find the empirical formula.
Answers
Answer: C3H2O
Explanation: To find the empirical formula of the compound, we need to determine the simplest whole number ratio of atoms in the compound.
Assuming we have 100 g of the compound, we can convert the percentages to masses of each element:
Carbon: 66.7 g
Hydrogen: 3.74 g
Oxygen: 29.6 g
Next, we need to convert these masses to moles using the atomic masses:
Carbon: 66.7 g / 12.01 g/mol = 5.55 mol
Hydrogen: 3.74 g / 1.01 g/mol = 3.70 mol
Oxygen: 29.6 g / 16.00 g/mol = 1.85 mol
Now we need to divide each of these mole values by the smallest of the three:
Carbon: 5.55 mol / 1.85 mol = 3.00
Hydrogen: 3.70 mol / 1.85 mol = 2.00
Oxygen: 1.85 mol / 1.85 mol = 1.00
These ratios give us the empirical formula:
C3H2O
However, we can simplify this formula by dividing each subscript by 2:
C1.5H1O0.5
Finally, we can multiply through by 2 to get rid of the decimals:
C3H2O