NaCl has a lattice energy of -787 kJ/mol . Consider a hypothetical salt XY. X3+ has the same radius of Na+ and Y3− has the same radius as Cl−.
Esitmate the lattice energy of XY.
Answers
The lattice energy of XY can be estimated using the reaction equation: ΔH = k * (q1 * q2) / d, where q1 and q2 are the charges on the ions, d is the distance between the ions, and k is a constant.
Given that the lattice energy of NaCl is -787 kJ/mol, we can estimate the lattice energy of XY using the Born-Haber cycle, which relates the lattice energy to other thermodynamic quantities. The Born-Haber cycle for XY is given as follows:ΔHf (XY) + IE(X) + 3/2 EA(Y) + D (XY) - ΔH (lattice) = 0Here, ΔHf (XY) is the enthalpy of formation of XY, IE(X) is the ionization energy of X, EA(Y) is the electron affinity of Y, D(XY) is the dissociation energy of XY, and ΔH (lattice) is the lattice energy of XY.
The lattice energy of a compound can be calculated using the Born-Haber cycle, which relates the lattice energy to other thermodynamic quantities. In this case, we can use the Born-Haber cycle to estimate the lattice energy of the hypothetical salt XY. Since XY is a hypothetical salt, we can assume that the enthalpy of formation and dissociation energy are both zero. We can also assume that the ionization energy and electron affinity of X and Y, respectively, are equal to those of Na and Cl, since X3+ has the same radius as Na+ and Y3- has the same radius as Cl-.Using experimental data for the ionization energy and electron affinity of Na and Cl, we can estimate the lattice energy of XY to be 147 kJ/mol.
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Related Questions
the synthesis of biodiesel can be classified under what type of organic reaction?
Answers
1. Specific Heat Capacity.
A. Heat on concrete
The specific heat capacity of concrete is 0.880 J/g °C
Calculate the heat added to 3 g of concrete if the temperature increased by 0.64 °C
Use the equation q=mcat
B. Hot water
The specific heat capacity of water is 4.186J/g °C
Calculate the temperature change when 8000 J of heat is added to 3g of water,
Use the equation q=mcat
Answers
Answer:
B.
Solution given:
specific heat capacity of water [c]4.186 J/g °C
temperature[∆T]=?
mass[m]=3g
heat[Q]=8000J
we have
Q=mc∆T
8000=3*4.186*∆T
∆T=8000/12.558
∆T=637.04°C.
the temperature change is 637.04°C.
If a piece of aluminum that is 3.90 g and at 99.3°C is dropped into 10.0 g of water at 22.6°C, the final temperature is 28.6°C. What is the specific heat capacity of aluminum?
Answers
To solve for the specific heat capacity of aluminum, we can use the formula:
q = m × c × ΔT, Where q is the heat transferred, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature.
First, we need to calculate the heat transferred from the aluminum to the water:
q = mAl × cAl × ΔTAl
q = (3.90 g) × cAl × (28.6°C - 99.3°C)
q = -978 J
Note that we get a negative value for q because heat is transferred from the aluminum to the water, so the aluminum loses heat.
Next, we can calculate the heat gained by the water:
q = mwater × cwater × ΔTwater
q = (10.0 g) × cw × (28.6°C - 22.6°C)
q = 240 J
Setting these two equations equal to each other, we can solve for the specific heat capacity of aluminum:
mAl × cAl × ΔTAl = mwater × cwater × ΔTwater
cAl = (mwater × cw × ΔTwater) / (mAl × ΔTAl)
cAl = (10.0 g) × (4.184 J/g·°C) × (28.6°C - 22.6°C) / [(3.90 g) × (99.3°C - 28.6°C)]
cAl = 0.900 J/g·°C
Therefore, the specific heat capacity of aluminum is 0.900 J/g·°C.
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10
Which type of species can respond better to changes in the environment?
A generalized species
B specialized species
Cendangered species
D extinct species
Answers
Answer:
Endangered species .............................
Of a 4 M solution of HCl, 1 L is diluted to 2M. What is the volume of the diluted solution?
A. 2L
B. 0. 5L
C. 8L
D. 4L
Answers
Answer:
D because i say so and i am just here to get awnsers
Why did you test the reaction mixture with starch/iodide paper before starting the separatory funnel steps
Answers
Answer:
This paper is impregnated with iodide ions and starch and will turn black if treated with an oxidizing agent (e.g. HOCl) which oxidizes the iodide ions
Explanation: hope this helps :)
Which statement is true about molarity and percent by mass? (3 points)
Question 4 options:
1)
Both are ratios of the amount of solute over the amount of solution.
2)
They are ratios of the dilution over the concentration.
3)
They are inversely related.
4)
Both measure dilution.
Answers
Answer:
The correct answer is - Both are ratios of the amount of solute over the amount of solution.
Explanation:
Molarity is the number of moles of a substance in 1 liter of the solution. Another unit of the concentration, weight percentage, refers to the ratio of the mass of the solute (a dissolved substance) to the mass of the solution.
Molarity is to divide moles by liters, but the convention in mass percent is to divide grams by milliliters. If you prefer to think only in terms of liters (not milliliters), then simply consider mass percent as kilograms divided by liters.
Answer:
A. Both are ratios of the amount of solute over the amount of solution.
Hope this helps! :D
Explanation:
Not enough food to eat is _____
A: Abiotic
B: Biotic
Answers
Not enough food to eat is A: Abiotic
The Haber process can be used to produce ammonia (NH3) from hydrogen gas (H2) and nitrogen gas (N2). The balanced equation for this process is shown below. 3H2 N2 Right arrow. 2NH3 The molar mass of NH3 is 17. 03 g/mol. The molar mass of H2 is 2. 0158 g/mol. In a particular reaction, 0. 575 g of NH3 forms. What is the mass, in grams, of H2 that must have reacted, to the correct number of significant figures? 0. 1 0. 102 0. 10209 0. 1021.
Answers
Answer:
B
Explanation:
We are given that ammonia can be produced from hydrogen gas and nitrogen gas according to the equation:
\(\displaystyle 3\text{H$_2$} + \text{N$_2$} \longrightarrow 2\text{NH$_3$}\)
We want to determine the mass of hydrogen gas that must have reacted if 0.575 g of NH₃ was produced.
To do so, we can convert from grams of NH₃ to moles of NH₃, moles of NH₃ to moles of H₂, and moles of H₂ to grams of H₂.
We are given that the molar masses of NH₃ and H₂ are 17.03 g/mol and 2.0158 g/mol, respectively.
From the equation, we can see that two moles of NH₃ is produced from every three moles of H₂.
With the initial value, perform dimensional analysis:
\(\displaystyle \begin{aligned} 0.575\text{ g NH$_3$}& \cdot \frac{1\text{ mol NH$_3$}}{17.03\text{ g NH$_3$}} \cdot\frac{3\text{ mol H$_2$}}{2\text{ mol NH$_3$}} \cdot \frac{2.0158\text{ g H$_2$}}{1\text{ mol H$_2$}} \\ \\ & = 0.102\text{ g H$_2$}\end{aligned}\)
*Assuming 100% efficiency.
Our final answer should have three significant figures. (The first term has three, the second term has four (the one is exact), the third term is exact, and the fourth term has five. Hence, the product should have only three.)
In conclusion, our answer is B.
how many moles of no₂ would be produced from 4.5 mol of o₂ in the reaction below assuming the reaction has a 57.0% yield? 2 no (g) o₂ (g) → 2 no₂ (g)
Answers
5.13 moles of NO₂ is produced from 4.5 moles of O₂, assuming the reaction has a 57% yield.
Given reaction:
2NO (g) + O₂ (g) → 2NO₂(g)
2mole 1 mole 2mole
Here,
1 mole of O₂ produces= 2 moles of NO₂
Therefore,
4.5 moles of O₂ will produce
= 2 × 4.5 moles
= 9 moles of NO₂
For 100 % yield, 9 moles of NO₂ is produced from 4.5 moles of O₂
Assuming the reaction has a 57% yield, number of moles of NO₂ produced is calculated as:
% yield= \(\frac{ actual yield}{ theoretical yield}\) × 100%
57 = \(\frac{actual yield}{ 9 mole}\) × 100%
actual yield = 9 moles × 57 /100
actual yield= 5.13 moles
Thus, 5.13 moles of NO₂ is produced from 4.5 moles of O₂
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Which best describes this compound
Answers
Answer:
There is nothing to see
Explanation:
You didnt add the image
If a piece of matter changes shape, how does its mass change?
A.It increases.
B.It decreases.
C.It changes randomly.
D.It remains the same.
PLEASE HELP!!
Answers
The law of conservation of mass states that matter cannot be created nor destroyed the answer would be D. It remains the same
When an organism dies it is exposed to many different types of biotic and abiotic factors biotic factors include?
Answers
Answer:
the organisms themselves,other organisms,interactions between living organisms, and even their waste.
Select 3
Which of these changes are Physical changes?
1.using electrolysis to break the substance down into simpler substances.
2.burning a substance in oxygen.
3.increasing the mass of a substance.
4.cutting a substance into smaller pieces.
5.boiling a substance.
Answers
PLEASE HELP ILL GIVE BRAINLIEST
Answers
How many manganese atoms are in each formula unit of potassium permanganate?
Answers
16.
Magnesium reacts with hydrochloric acid according to the equation below.
Magnesium bertindak balas dengan asid hidroklorik mengikut persamaan berikut.
Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)
What is the volume of hydrogen gas produced at room condition if 0.6 g of
magnesium is added to the excess of sulphuric acid?
[Relative atomic mass : Mg = 24 : molar volume = 24 dmº mol' at room condition]
Berapakah isipadu gas hidrogen yang dihasilkan pada keadaan bilik jika 0.6 g
magnesium ditambahkan kepada asid hidroklorik berlebihan."
[Jisim atom relative:Mg = 24 : isipadu molar = 24 dm mol! pada keadaan bilik]
A 0.6 cm
B 6.0 cm
C 60.0 cm
D 600 cm
Answers
which of the following involves a change in the physical properties of original substance?
Answers
The answer is D (Both A and C)
Ketamine, sometimes used as an adjuvant Two general anesthesia, it’s available as a 10.0% (w/v) solution. Calculate the mass of ketamine in 1.50 mL of this solution. Be sure your answer has a unit symbol and is rounded to the correct number of significant digits.
Answers
Answer:
\(0.15g\text{ of ketaime}\)Explanation:
Here, we want to calculate the mass of ketamine in 1.50 mL of the solution
A 10% w/v means there are 10 g iof ketamine n 100 ml of solution
Thus, if we have 10 g in 100 ml, there will be x g in 1.5 ml
10g in 100 ml
xg in 1.5 ml
By cross multiplication, we have:
\(\begin{gathered} 10\text{ }\times\text{ 1.5 = x}\times\text{ 100} \\ x\text{ = }\frac{15}{100} \\ x\text{ = 0.15g} \end{gathered}\)How is it possible for helium to have 8 spectral lines when it only has 2 electrons?
Answers
It has more lines in it compared to hydrogen emission spectrum. It is mainly because the helium atom has more electrons than a hydrogen atom. Therefore, more electrons get excited when we pass a white light beam through a helium sample, and it causes the emission of more spectral lines
Which statement describes the VSEPR theory?
A.
Electron pairs in the valence shell of an atom have a tendency to attract other nearby electron pairs.
B.
Electrons in the valence shell of an atom exert a repulsive force on other atoms while forming a chemical bond.
C.
Electron pairs in the valence shell of an atom exert a repulsive force on all other electron pairs in the valence shell of the atom.
D.
Electrons in the valence shell exert a repulsive force while completing their octet during the formation of chemical bond.
Answers
Answer:
A.
Electron pairs in the valence shell of an atom have a tendency to attract other nearby electron pairs.
Hope it helps you.The number of molecules in 1 mole of NaCl?
Answers
Answer:
6.022 x 10^23 molecules
Explanation:
the ratio of effusion of an unknown diatomic gas to oxygen is 0.50:1. what is molar mass of the unknown gas?
Answers
The molar mass of the unknown gas is 8.05 g/mol.
The ratio of effusion of an unknown gas to oxygen is 0.50:1, which means that the effusion rate of the unknown gas is half that of oxygen. Effusion is the process by which a gas escapes through a tiny hole into a vacuum, and the rate of effusion is directly proportional to the square root of the gas' molar mass. So, we can use this relationship to calculate the molar mass of the unknown gas.
Let's assume that the molar mass of oxygen is 32 g/mol. Then, the square root of the molar mass of oxygen is √32 = 5.66. If the effusion rate of the unknown gas is half that of oxygen, then the square root of its molar mass is 0.5 * 5.66 = 2.83. Taking the square of 2.83 gives us 8.05, which is the molar mass of the unknown gas.
Therefore, the molar mass of the unknown gas is 8.05 g/mol.
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Need help for school
Answers
Answer: The answer is C
Which best describes nitrogen fixation?
Answers
Answer:
Nitrogen fixation is the process of converting nitrogen to a usable form.
Un vehículo inicia su recorrido desde el reposo, al cabo de 30 segundos tiene una velocidad de 120 m/s. ¿Cuál es la aceleración que trae dicho vehículo?
Answers
Explanation:
KTLDÖDUÖOQO5SKDXBBCMCNXYLZD
Calculate the mass of an object that is pushed with a force of 13 N and accelerates at 2.5 m/s2
a.5.2m/s2
b.5.2n
c.5.2kg
d.10kg
Answers
Force = mass x acceleration
To get the mass you have to manipulate the formula equal -
Mass= force divided by acceleration
13N divided by 2.5m/s^2 = 5.2kg.
Which of the following gives the correct phases for the products of reaction I-1?3CaCl2(aq) + 2Na3PO4--> 6NaCl + Ca3(PO4)3A. 6NaCl(aq) + Ca3(PO4)2 (aq)B. 6NaCl(s) + Ca3(PO4)2 (aq)C. 6NaCl(aq) + Ca3(PO4)2 (s)D. NaCl(s) + Ca3(PO4)2 (s)
Answers
The resulting reaction products are an ionic salt (NaCl) and an oxysalt (Ca3(PO4)2.
When NaCl is in contact with water, it dissolves and the water molecules separate their ions, therefore it will be in the aqueous phase.
In contrast, Ca3(PO4)2 is not soluble in water, therefore the molecule will settle out of solution as solid crystals.
So the answer will be C. 3NaCL(aq)+Ca3(PO4)2
What is enthalpy change and volume change of mixing of two components forming an ideal solution?
Answers
Enthalpy change of mixing refers to the energy change during the formation of an ideal solution. Volume change of mixing relates to the change in volume resulting from the mixing process.
What is enthalpy ?Enthalpy is a thermodynamic property that represents the total heat content of a system at constant pressure. It encompasses both the internal energy of the system and the work done by or on the system. Enthalpy is denoted by the symbol "H" and is typically measured in units of energy, such as joules (J) or calories (cal). Enthalpy accounts for the energy transferred as heat during chemical reactions or phase changes. Enthalpy is crucial in studying and analyzing various phenomena, including chemical reactions, phase transitions, and energy transfers in thermodynamic systems.
Volume change of mixing, on the other hand, relates to the change in volume resulting from the mixing process. It accounts for the variation in molecular interactions and the resulting effects on the overall volume of the mixture compared to the volumes of the individual components.
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I would believe that a colored ink is a mixture if I see...
Answers
Answer:
it in a chromatography paper.
Explanation:
Water-based Ink is comprised of various colors, red, black, orange, blue, etc. The ink in the Fountain pen is a good example of it. There's a combination of water and specific color pigment to create the various colors. Some pigments dissolve faster in water and are drawn further up the chromatography paper with the was while the others are becoming more tied to the paper and going slower.