Which species will decrease the solubility of caf2. select all that apply baf2 ca(no3)2 feco3 agl lifornia
Answers
The species that will decrease the solubility of CaF2 among the given options are:
BaF2
Ca(NO3)2
To determine which species will decrease the solubility of CaF2 (calcium fluoride), we need to identify the potential common ions that could cause a decrease in solubility. Common ions are ions that are already present in the solution and can reduce the dissociation of a compound.
In the case of CaF2, the dissociation equation is:
CaF2(s) ⇌ Ca^(2+)(aq) + 2F^-(aq)
The common ions that could potentially decrease the solubility of CaF2 are those that contain either Ca^2+ or F^- ions.
Among the given options, the species that contain these ions are:
BaF2 (barium fluoride): It contains the F^- ion. Since it has the same anion as CaF2, it will decrease the solubility of CaF2.
Ca(NO3)2 (calcium nitrate): It contains the Ca^2+ ion. Since it has the same cation as CaF2, it may decrease the solubility of CaF2 (but to a lesser extent than compounds with the F^- ion).
AgL (silver iodide): It does not contain either Ca^2+ or F^- ions, so it will not affect the solubility of CaF2.
LiCl (lithium chloride): It does not contain either Ca^2+ or F^- ions, so it will not affect the solubility of CaF2.
FeCO3 (iron(II) carbonate): It does not contain either Ca^2+ or F^- ions, so it will not affect the solubility of CaF2.
Therefore, the species that will decrease the solubility of CaF2 among the given options are:
BaF2
Ca(NO3)2
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Related Questions
If 200 ml of 0.30 M propionic acid is added to 400 ml of water, what is the resulting pH of the solution
Answers
The resulting pH of the solution formed by adding 200 ml of 0.30 M formic acid to 400 ml of water, with a pKa of 3.75, is approximately 2.3.
To determine the resulting pH of the solution, we need to consider the dissociation of formic acid (HCOOH) in water. Formic acid is a weak acid that partially dissociates into hydrogen ions (H⁺) and formate ions (HCOO⁻). The dissociation constant of formic acid is represented by pKa, which is equal to -log(Ka), where Ka is the acid dissociation constant.
Given the pKa of formic acid as 3.75, we can use the Henderson-Hasselbalch equation to calculate the pH:
pH = pKa + log([A⁻]/[HA])
In this case, [A⁻] represents the concentration of the formate ions and [HA] represents the concentration of the undissociated formic acid. The total volume of the resulting solution is 200 ml + 400 ml = 600 ml.
Using the given concentration of 0.30 M formic acid, we can calculate the concentration of formate ions ([A⁻]) and undissociated formic acid ([HA]):
[HA] = concentration of formic acid = 0.30 M x (200 ml/600 ml) = 0.10 M
[A⁻] = concentration of formate ions = 0.30 M x (400 ml/600 ml) = 0.20 M
Substituting these values into the Henderson-Hasselbalch equation:
pH = 3.75 + log(0.20/0.10) = 2.3 (rounded to one decimal place)
Therefore, the resulting pH of the solution is approximately 2.3 when 200 ml of 0.30 M formic acid is added to 400 ml of water with a pKa of 3.75.
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Complete Question:
if 200ml of 0.30M formic acid is added to 400 ml of water, what is the resulting PH of the solution? round the answer to one decimal place Pka 3.75
10:38 Fri 9 Jul
ES
GCSE Science - Chemistry
2 of 15
Name the indicator that is red in acid and turns green when the solution becomes neutral.
|
Answers
Answer.
Universal indicator
Explanation.
Universal indicator has many different colour changes, from red for strongly acidic solutions to dark purple for strongly alkaline solutions. In the middle, neutral pH 7 is indicated by green.
What health benefits can you get from consuming fiber? (select all that apply.)
soluble fiber can be absorbed into your skin to increase skin cells.
fiber helps digestion and can prevent constipation.
fiber can help create red blood cells.
soluble fiber helps lower cholesterol, which may prevent heart disease.
Answers
Answer:
Above all are correct answer.
some other benefits are like, Dietary fiber increases the weight and size of your stool and softens
Answer:
I Think its fiber helps digestion and can prevent constipation.and soluble fiber helps lower cholesterol, which may prevent heart disease.
Explanation:
A balloon has a pressure of 3.1 atm at a volume of 155 ml. if the temperature is held constant, what is the volume (ml) if the pressure is increased to 10.5 atm?
Answers
Answer:
45.8 mL
Explanation:
If all variables are held constant, the new volume can be found using the Boyle's Law equation. The equation looks like this:
P₁V₁ = P₂V₂
In this equation, "P₁" and "V₁" represent the initial pressure and volume. "P₂" and "V₂" represent the final pressure and volume. You can find the new volume by plugging the given values into the equation and simplifying.
P₁ = 3.1 atm P₂ = 10.5 atm
V₁ = 155 mL V₂ = ? mL
P₁V₁ = P₂V₂ <----- Boyle's Law equation
(3.1 atm)(155 mL) = (10.5 atm)V₂ <----- Insert values
480.5 = (10.5 atm)V₂ <----- Multiply 3.1 and 155
45.8 = V₂ <----- Divide both sides by 10.5
How does the chemistry of the ocean change in response to high levels of CO2 in the atmosphere?
Answers
PLEASE HELP ASAP
magnesium has a density of 1.74 g/cm3. if you have a sphere of solid magnesium that has a volume of 290 cm 3 what is its mass in grams
Answers
The mass of magnesium, which has a density of 1.74 g/cm is 504.6 g.
What is mass?Mass is the quantity of matter. Mass can be calculated by multiplying density by volume.
Magnesium is a chemical element with the atomic number 12. It is needed in the body in trace amounts. It can cause malnutrition in the body.
Mass = Density x volume
We know the density and the volume of magnesium.
Density = 1.74
Volume = 290
Density x volume
Putting the value in the equation
1.74 x 290 = 504.6 g
Thus, the mass of magnesium is 504.6 g.
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5. Which statements correctly describe the strength of an acid or base? Select all that apply.
Answers
Answer:
(Because the given was unclear, I do not know the statements that was provided. I will give you what I can)
The strength of an acid or base is the extent to which it ionizes when dissolved in water. A strong acid or base ionizes completely, while a weak acid or base ionizes partially.The strength of an acid or base is quantified by its ionization constant, K a or K b , which represents the equilibrium concentration of the ions produced by the acid or base ionization reaction. A high K a or K b value indicates a strong acid or base, while a low K a or K b value indicates a weak acid or base.The strength of an acid or base is measured by its pH, which is the negative logarithm of the hydronium ion concentration in solution. A low pH indicates a high hydronium ion concentration and a strong acid, while a high pH indicates a low hydronium ion concentration and a strong base. A neutral pH is 7, which corresponds to pure water..the formula of an ionic compound starts with a metal and that of a molecular compound starts with a nonmetal. the statement is
perfectly true
Somewhat true
Slightly true
Not true at all
Answers
There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, the given statement is Slightly true.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
An ionic compound is a metal and nonmetal combined compound. Ionic compound are very hard. They have high melting and boiling point because of strong ion bond.
The formula of an ionic compound starts with a metal and that of a molecular compound starts with a nonmetal. The statement is Slightly true.
Therefore, the given statement is Slightly true.
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LOT OF POINTS!!!! PLEASE HELP ASAP NEED. HELP ASAP NO ROCKY PLS RN I WILL GIVE BRAINLIEST
Identify one or more choices that best complete the statement or answer the question.
Formulas of pairs of compounds of nitrogen oxides are given below. Which pairs are consistent for a given mass of nitrogen such that the first compound contains twice the mass of oxygen as the second compound?
a. NO4:NO2
b. NO4:N2O
c. NO2:NO
d. NO:N2O
a., b., and d. only
a. and c. only
a., c., and d. only
c. and d. only
Answers
What is the temperature of a container with a volume of 10L and a pressure of 10 atm that containes 16 mol of O2
Answers
To determine the temperature of a gas using the ideal gas law, we need to rearrange the equation to solve for temperature (T). The ideal gas law is expressed as:
PV = nRT
Where:
P = pressure of the gas
V = volume of the gas
n = number of moles of the gas
R = ideal gas constant
T = temperature of the gas
We can rearrange the equation as follows:
T = PV / (nR)
Given:
P = 10 atm
V = 10 L
n = 16 mol
R = 0.0821 L·atm/(mol·K) (ideal gas constant)
Substituting the values into the equation, we have:
T = (10 atm * 10 L) / (16 mol * 0.0821 L·atm/(mol·K))
Calculating the expression:
T = 6.1 atm * L / (mol·K)
The units of atm and L cancel out, leaving the temperature in Kelvin (K):
T ≈ 371.58 K
Therefore, the temperature of the container with a volume of 10 L, a pressure of 10 atm, and containing 16 mol of O2 is approximately 371.58 K.
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To determine the temperature of a gas using the ideal gas law, we need to rearrange the equation to solve for temperature (T). The ideal gas law is expressed as:
PV = nRT
Where:
P = pressure of the gas
V = volume of the gas
n = number of moles of the gas
R = ideal gas constant
T = temperature of the gas
We can rearrange the equation as follows:
T = PV / (nR)
Given:
P = 10 atm
V = 10 L
n = 16 mol
R = 0.0821 L·atm/(mol·K) (ideal gas constant)
Substituting the values into the equation, we have:
T = (10 atm * 10 L) / (16 mol * 0.0821 L·atm/(mol·K))
Calculating the expression:
T = 6.1 atm * L / (mol·K)
The units of atm and L cancel out, leaving the temperature in Kelvin (K):
T ≈ 371.58 K
Therefore, the temperature of the container with a volume of 10 L, a pressure of 10 atm, and containing 16 mol of O2 is approximately 371.58 K.
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what is the heating curve on the horizontal line
Answers
Answer:
The plateaus or horizontal lines on the graph represent the transition between states of the sample. The first plateau represents the melting (or transition from solid to liquid) and the second plateau represents boiling (or transition from liquid to gas).
Explanation:
The specific heat of water is 4.2 J/g C. If a one gram sample of water absorbs 50 Joules of energy, how much will its temperature rise?
Answers
Answer: 12 g
Explanation:
ΔS = q(reverse)/T, where q(reverse) is equal to the heat that would be transferred if the process were reversable and T is the absolute temperature in Kelvin (constant). this eqn can calculate ΔS for ANY isothermal process between states, not just the reversible one
Answers
Sure, I'd be happy to help! The equation you provided, ΔS = q(reverse)/T, is known as the Clausius inequality and is a statement of the second law of thermodynamics. This equation tells us that for any isothermal process between two states, the change in entropy (ΔS) is equal to the heat transferred (q) in a reversible process divided by the absolute temperature (T). Note that q(reverse) represents the maximum amount of heat that could be transferred in a reversible process between the same two states. In practice, it may not be possible to carry out a reversible process, so we may need to estimate the heat transferred using other methods. It's important to keep in mind that this equation only applies to isothermal processes, where the temperature remains constant throughout the process. Additionally, while this equation can be used to calculate the entropy change for any isothermal process, it is only equal to the actual entropy change for reversible processes. For irreversible processes, the actual entropy change will be greater than the value calculated using this equation.
About EquationAn equation is a mathematical statement in the form of a symbol that states that two things are exactly the same. Equations are written with an equal sign, as follows: x + 3 = 5, which states that the value x = 2. 2x + 3 = 5, which states that the value x = 1. The statement above is an equation. Thermodynamics is a branch of physics that deals with the conversion of heat energy into other forms of energy. The first law of thermodynamics and the second law of thermodynamics become a reference in discussing energy changes. In thermodynamics, an isothermal process is a type of thermodynamic process in which the temperature T of a system remains constant: T = 0.
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Crystal shield (CuSO4 . 5H2O) dissolves in water in the large tank.
CuSO4′5H2O(s) → CuSO4 (aq) + 5H2O(l)
Calculate the flux of CuSO4 and the transfer rate per unit area from the crystal surface to the bulk solution.
Data:
- There is a film layer around the crystal with a thickness of 0.01 mm and diffusion occurs in molecular form.
- The inner surface of the film layer is saturated with CuSO4 and the outer film layer is saturated with water vapor.
- 24.3 g crystal/100 g water at 275 K, density 1140 kg/m3
- Diffusion of CuSO4 in dilute aqueous solution 3.6x10-10 m2/s at 275 K
- Concentration can be taken at an average of 55.93 kmol/m3, water density 1000 kg/m3
Answers
Given:
Crystal shield (CuSO4 . 5H2O) dissolves in water in the large tank.CuSO4′5H2O(s) → CuSO4 (aq) + 5H2O(l)0.01 mm = thickness of film layer24.3 g crystal/100 g water at 275 K, density 1140 kg/m3Diffusion of CuSO4 in dilute aqueous solution 3.6x10-10 m2/s at 275 K
Concentration can be taken at an average of 55.93 kmol/m3, water density 1000 kg/m3The mass of CuSO4 that dissolves per unit area per unit time is called flux.The transfer rate per unit area from the crystal surface to the bulk solution is given by;\(\frac{dn}{dt} = D.
A\frac{dc}{dx}\)Where, D is diffusion coefficient A is the area of the interfacec is the concentration of the diffusing species in the filmx is the direction of diffusion
From the given data, crystal density can be calculated as;\(\frac{24.3}{100+24.3}=0.1955\)
Now, we can calculate the mass transfer flux from the given data;\(\frac{55.93}{159.61}=\frac{C_{CuSO_4}}{1140}\)\(C_{CuSO_4}=39.76 kmol/m^3\)\(J = -D\frac{dc}{dx}\)
Since the inner film is saturated, \(c_0 = 39.76 kmol/m^3\)
At the outer surface, there is no CuSO4 present and the concentration gradient is;\(\frac{39.76-0}{0.01*10^{-3}}= 3.976*10^6 kmol/m^4\)\(J = -3.6*10^{-10}*3.976*10^6\)\(= -1.43456*10^{-3} kmol/m^2s\)
Thus, the mass transfer flux is -1.43456 * 10^-3 kmol/m^2s.
The transfer rate per unit area from the crystal surface to the bulk solution is -1.43456 * 10^-3 kmol/m^2s.
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What makes plants the beginning of the food chain?
please answer my question aswell as my last one!
Answers
Answer: A
Explanation:
i just took the quiz and it was right!
write the oxidation number of the oxygen atoms in h2o2 and the oxidation number of the oxygen atoms in o2
Answers
the oxidation number of the oxygen atoms in h2o2 and the oxidation number of the oxygen atoms in o2 is -1 and 0
An atom's oxidation number (also known as oxidation state) in a chemical is an amount that represents the amount of electron density gained or lost by the atom during in the formation of the compound. In general, the oxidising number of an element in a compound can be determined using the following rules: n element's oxidising number is null whenever it is unrestricted (uncombined). The oxidation number of a polyatomic ion is equivalent towards the ion's charge. We can use these rules to calculate the oxidation number of the oxygen atoms in H2O2 and O2: In H2O2, the oxidation number of the oxygen atoms is -1. This is because the compound is neutral and the hydrogen atoms have an oxidation number of +1, so the oxygen atoms must have an oxidation number of -1 in order for the sum of all the oxidation numbers to be zero. In O2, the oxidation number of the oxygen atoms is 0. This is because the compound is a diatomic molecule and the oxidation number of the free element oxygen is 0.
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Question 11
Which formula represents a hydrocarbon?
C₂H6
C₂H5OH
C₂H5Cl
C₂H6O
Answers
Answer:
C₂H6
Explanation:
Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). Option A
A hydrocarbon is a compound that consists of only carbon and hydrogen atoms. It is important to identify the formula that represents a hydrocarbon among the given options:
A) C₂H6: This formula represents ethane, which is a hydrocarbon. Ethane consists of two carbon atoms bonded together with single bonds and six hydrogen atoms.
B) C₂H5OH: This formula represents ethanol, which is not a hydrocarbon. Ethanol contains a hydroxyl group (-OH), indicating the presence of oxygen in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.
C) C₂H5Cl: This formula represents ethyl chloride, which is not a hydrocarbon. Ethyl chloride contains a chlorine atom (Cl) in addition to carbon and hydrogen atoms. It is a haloalkane, not a hydrocarbon.
D) C₂H6O: This formula represents ethanol, which, as mentioned before, is not a hydrocarbon. Ethanol contains an oxygen atom (O) in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.
Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). It consists only of carbon and hydrogen atoms, making it a suitable representation of a hydrocarbon.
In summary, the formula C₂H6 (option A) represents a hydrocarbon, while the other options contain additional elements (oxygen or chlorine) that make them non-hydrocarbon compounds. Option A
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which of these is the smallest particle
Answers
Answer:
atom
Explanation:
A compound is atoms combined (or something combined) and a speck of dust is visible unlike the other two
Answer:
Atom
Explanation:
It would be the atom
3. Why is it important for other variables in an experiment to be controlled?
Answers
To derive precise results, it is important for other variables in an experiment to be controlled. Accuracy and precision are the key factors of every practical experiment carried out.
During the course of experiments, special emphasis is laid on the objective of the experiment. Procedures and precautions are highly objective-oriented. There are possibilities of errors as the surrounding becomes an integral part of the system in practicals.
Certain physical and chemical quantities are ignored in theoretical assessment, but they affect the practical work. Impurities and uncontrolled reactions can be barriers. Optimum conditions are sought before conducting experiments.
1.
In the modem periodic table, periods with heavier elements are longer than periods with lighter elements. This difference in period length exists because -
A the nuclei of lighter elements are more stable than those of heavier elements.
B. Othere are many more heavy elements than light elements.
CO Mendeleev originally designed the periodic table this way.
D.
D. heavier elements have more electron sub-shells than lighter elements
Answers
Answer:
c
Explanation:
In the modern periodic table, periods with heavier elements are longer than periods with lighter elements. This difference in period length exists because there are many more heavy elements than light elements.
The periodic table is arrangement of elements in groups and periods. Elements in the same group of the periodic table have the same number of valence electrons while elements in the same period have the same number of shells.
Period 1 contains the lightest elements, hydrogen and helium. However, in the periodic table, we notice that periods with heavier elements are longer than periods with lighter elements. This is because there are many more heavy elements than light elements.
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PLEASE HELPPP ME IN CHEMISTRYYY! What does the hump in the middle of each energy diagram represent?
(endothermic and exothermic diagrams)
Answers
Answer:Activation Energy
Explanation:
The thermal decomposition of ammonium chloride follows the equilibrium: NH_4 Cl (s) NH_3 (g) + HCl (g) Given the In K_p versus temperature plot and the best fit equation, determine delta H degree. (Assume delta H degree and delta S degree_rxn do not change significantly with temperature.) kJ/mol Determine delta S degree of the reaction at 240.0 K. J/(mol K) Determine delta G_rxn of the reaction at 240.0 K. kJ/mol
Answers
To determine ΔH°, ΔS°, and ΔG° for the thermal decomposition of ammonium chloride at 240.0 K, we would need the given In K_p versus temperature plot and the best fit equation. Without that specific information, I won't be able to calculate the values you're requesting.
The general equations to calculate ΔH°, ΔS°, and ΔG° using the Van't Hoff equation:
ln(K2/K1) = (-ΔH°/R) * (1/T2 - 1/T1)where:
K1 and K2 are the equilibrium constants at temperatures T1 and T2, respectively,ΔH° is the standard enthalpy change,R is the gas constant (8.314 J/(mol K)),T1 and T2 are the temperatures in Kelvin.ΔS° can be calculated using the equation:ΔS° = ΔH° / TΔG° can be calculated using the equation:ΔG° = ΔH° - TΔS°Please provide the specific data from the In K_p versus temperature plot and the best fit equation, so I can assist you in calculating ΔH°, ΔS°, and ΔG° at 240.0 K.
About TemperaturesTemperature shows the degree or size of the heat of an object. Simply put, the higher the temperature of an object, the hotter it is. Microscopically, temperature shows the energy possessed by an object. Temperature is a term that expresses the hotness and coldness of a substance, object, or air. When we hold an object or enter a room we can directly feel its temperature. While temperature is a quantity that states the level or degree of heat of an object or substance being measured.
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If 400cm³ of Q was collected at 250°c and 1.20×10³nm², calculate the volume it would occupy at STP
Answers
Answer:
2.481cm³
Explanation:
this is general has equation so the formula is
P1V1/T1 = P2V2/T2
At STP, pressure is 1.01*10⁵ and temperature is 273K
((1.20*10³)400)/(250+273) = ((1.01*10⁵)V2/(273)
V2 = 2.481cm³
what is the forumla for pentoxygen dichloride
Answers
Answer: O5Cl2
Explanation:
Write a formula for the compound that forms between lithium and each polyatomic ion:O CarbonateO PhosphateO Hydrogen PhosphateO Acetate
Answers
The formula for the compound that forms between lithium and each polyatomic ion is \(Li_{2}CO_{3}\), \(Li_{3}PO_{4}\), \(Li_{2} HPO_{4}\) and \(CH_{3}COOLi\).
A substance made up of two or more different chemical elements together in a certain ratio is known as a compound in chemistry. When the elements interact with one another, chemical bonds are formed that are difficult to break.
Only a few of the elements on the periodic table have a second letter that is lowercase after their initial capital letter. Therefore, you can tell an ion is polyatomic if it contains two capital letters together.
So, from the question
The compound that lithium will form with carbonate is \(Li_{2}CO_{3}\)
The compound that lithium will form with phosphate is \(Li_{3}PO_{4}\)
The compound that lithium will form with hydrogen phosphate is \(Li_{2} HPO_{4}\)
The compound that lithium will form with acetate is \(CH_{3}COOLi\)
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Determine the energy of a photon whose frequency is 5.55 × 1017 Hz.
Answer in units of J.
Answers
Espero que esos ejercicios y esas fórmulas te ayuden
ou would expect benzoic acid to be quite multiple choice soluble in water. soluble in aqueous base. soluble in aqueous acid. insoluble in any aqueous solution.
Answers
Benzoic acid is soluble in base. It is soluble in benzene, carbon tetrachloride, acetone, and alcohols and it's reactions occur at the carboxyl group or even at the aromatic ring.
What are benzoic acid?Benzoic acid is a monobasic aromatic acid, moderately strong, white and crystalline powder.
Benzoic acid becomes soluble in alkaline medium, . The abundant OH- ions will react with benzoic acid in acid-base reaction to give water and benzoate ion, which is now soluble in water due to strong ion-dipole forces of attraction.
Benzoic acid becomes insoluble in acidic medium. Increase in concentration of H+ ions shifts the position of equilibrium of dissociation of benzoic acid to left causing benzoic acid to be hardly soluble in acidic medium.
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the enthalpy of vaporization of substance is 25 kj/mol and its normal boiling point is 88 c . calculate the vapor pressure of at -93 c.
Answers
The vapor pressure of the substance at -93°C can be calculated using the Clausius-Clapeyron equation.
The Clausius-Clapeyron equation relates the vapor pressure of a substance at one temperature to its vapor pressure at another temperature. It is given by:
ln(P₂/P₁) = (ΔH_vap/R) * (1/T₁ - 1/T₂)
Where:
P₁ and P₂ are the vapor pressures at temperatures T₁ and T₂, respectively.
ΔH_vap is the enthalpy of vaporization.
R is the ideal gas constant.
In this case, we know that the enthalpy of vaporization (ΔH_vap) is 25 kJ/mol. The normal boiling point corresponds to the temperature at which the vapor pressure is equal to the atmospheric pressure, which is 88°C. We are asked to calculate the vapor pressure at -93°C.
To solve the equation, we need to convert the temperatures to Kelvin. The boiling point of 88°C is equal to 361 K, and -93°C is equal to 180 K. Plugging these values into the equation, along with the known enthalpy of vaporization, we can solve for the vapor pressure at -93°C.
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the word halogen comes from the greek meaning salt former t/f
Answers
Halogens, derived from Greek, are non-metallic elements in Group 17 of the periodic table, known for their highly reactive properties and use in halogen lamps and organic chemistry. Given statement is True
True. The word halogen comes from the Greek meaning salt-former. A halogen is a non-metallic element present in Group 17 of the periodic table of elements, such as fluorine, chlorine, iodine, bromine, and astatine. These five elements are known as halogens. Because they combine with metals to form halides, the term "halogen" comes from the Greek word meaning "salt-former." They have similar chemical properties, and they are highly reactive. They can be discovered in various states, including gas, liquid, and solid.
The term halogen refers to elements that are used in the production of halogen lamps, among other things, and are widely used in organic chemistry.
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Find the molar enthalpy of formation for paraffin wax (C2H526)) given the following reaction
C2H526) + 38 026) ► → 25 CO26) + 26 H,O)
A H = -14 800 kJ
Answers
Answer: The molar enthalpy of formation for paraffin wax is -2460.5 kJ
Explanation:
The balanced chemical reaction is,
\(C_{25}H_{52}(g)+38O_2(g)\rightarrow 25CO_2(g)+26H_2O(g)\)
The expression for enthalpy change is,
\(\Delta H=\sum [n\times \Delta H_f(product)]-\sum [n\times \Delta H_f(reactant)]\)
\(\Delta H=[(n_{CO_2}\times \Delta H_{CO_2})+(n_{H_2O}\times \Delta H_{H_2O})]-[(n_{O_2}\times \Delta H_{O_2})+(n_{C_{25}H_{52}}\times \Delta H_{C_{25}H_{52}})]\)
where,
n = number of moles
\(\Delta H_{O_2}=0\) (as heat of formation of substances in their standard state is zero
Now put all the given values in this expression, we get
\(-14800=[(25\times -393.5)+(26\times -285.5)]-[(38\times 0)+(1\times \Delta H_{C_{25}H_{52}})]\)
\(\Delta H_{C_{25}H_{52}}=-2460.5kJ/mol\)
Therefore, the molar enthalpy of formation for paraffin wax is -2460.5 kJ