All of the nitrogen in the N2H4 molecule hybridizes to Sp3.
How does hybridization work?The combining of two atomic orbitals to create a whole new class of hybridized orbitals is the notion of hybridization in chemistry. Hybrid orbitals with completely distinct energies are often the outcome of this mixing. In hybridization, the same-energy level atomic orbitals are crucial. However, as long as they have an equivalent amount of energy, both fully and partially filled orbitals can participate in this process.
All of the nitrogen in the N2H4 molecule hybridizes to Sp3. N2H4 has a dipole moment of 1.85 D and is polar in nature. The nitrogen atoms in N2H4 have no formal charge. The N2H4 molecule has a trigonal molecular geometry (shape).
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The light-gathering ability of a reflecting telescope depends on its _____
a. length
b. mirrors
c. lenses
d. materials
Answer:Mirrors
Explanation:
Calculate the frequency of wave that had a wavelength of 425 nm
The frequency of the wave is found to be 7.05×10¹⁴hertz.
The relation between speed of light, frequency and wavelength is given by,
C= fλ
f=c/λ
f= 3×10⁸/425×10⁻⁹
f=7.05×10¹⁴.
Thus, the frequency of the wave is found to be 7.05×10¹⁴ hertz.
The number of waves that pass a specific place in a given period of time is known as the wave frequency. The hertz (Hz) is the SI unit for wave frequency, and 1 hertz is equivalent to 1 wave crossing a fixed point in 1 second. A wave with a higher frequency has more energy than a wave with a lower frequency of the same amplitude.
A wave’s wavelength is the separation between two adjacent waves’ corresponding points. The Greek letter lambda () is typically used to represent a wave’s length. Wavelength is defined as the product of a wave train’s frequency (f) and speed (v) in a medium.
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in the laboratory, a quantity of i2 was reacted with excess h2 to give 0.590 moles of hi. it is also known that the percent yield of this reaction was 74.0%. how many moles of i2 reacted
Using the balanced reaction equation, we can calculate that 0.399 moles of iodine reacted.
To solve this, we need to write the balanced reaction equation first:
H₂ + I₂ → 2HI
Now we can use the actual yield and the percent yield to calculate the theoretical yield:
0.590 mol / 0.740 = 0.797 mol of HI
From the reaction equation, we can see that 1 mole of iodine produces two moles HI. Using that information, we can set up the following proportion:
1 mol of I₂ : 2 mol of HI = X : 0.797 mol of HI
X = 1 mol of I₂ * 0.797 mol of HI / 2 mol of HI
X = 0.399 mol of I₂
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What is the value of the gas constant, r, in units of l ⋅ atm mol ⋅ k ? report the value with at least three significant figures.
If you choose the first value of R, which is 0.082057 L atm mol-1K-1, then your units for pressure, volume, and temperature must all be in atm, liters, and Kelvin respectively.
What is gas constant?
The physical constant known as the gas constant (abbreviated R) is measured in terms of units of energy per degree increase in temperature per mole. Other names for it include the universal gas constant, the ideal gas constant, and the molar gas constant.
The gas constant is the same as the Boltzmann constant in terms of value, but it is stated as the pressure-volume product rather than energy per particle per degree of temperature increase.
Hence, the value of gas constant is 0.082057 L atm mol-1K-1,.
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How many total atoms does C6H₁2O6 contain?
Answer:
So, total number of atoms = 6 + 12 + 6 = 24.
Explanation:
Each item describes an example of thermal energy transfer. Identify each item according to the method of thermal energy transfer described in the scenario. There are two examples of heat transfer for each type below.
1. Someone places a hand on metal table and the hand feels cooler (conduction, convection, or radiation?)
2. Storm clouds from when warm air moves upwards in the atmosphere (conduction, convection, or radiation?)
3. A person turns on a lamp and feels it warmth on their hands (conduction, convection, or radiation?)
4. The heat from a space heater rises to the top of a room and is replaced by cooler air (conduction, convection, or radiation?)
5. Energy from the sun travels to the Surface of the Earth (conduction, convection, or radiation?)
6. Heat from a stove warms a pot of soup (conduction, convection, or radiation?)
Conduction is the process through which heat is transferred from an object's hotter end to its cooler end. A hotter body naturally transfers heat to a cooler body.
Convection is single- or multiphase fluid flow that develops on its own as a result of the interaction between a fluid's body forces—most frequently gravity and density—and material property heterogeneity.
Thermal radiation is electromagnetic energy released when matter particles move thermally. When heat from the movement of charges in the material is converted to electromagnetic radiation, thermal radiation is produced. Thermal radiation is emitted by all matter that has a temperature higher than absolute zero.
Someone places a hand on metal table and the hand feels cooler - conductionStorm clouds from when warm air moves upwards in the atmosphere -convectionA person turns on a lamp and feels it warmth on their hands -conductionThe heat from a space heater rises to the top of a room and is replaced by cooler air - convectionEnergy from the sun travels to the Surface of the Earth - radiationHeat from a stove warms a pot of soup - conductionTo know more about thermal energy transfer, click on the link below:
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1. A mixture consists of liquid A (boiling point = 45°C) and liquid B (boiling point = 86°C).
Which separation technique would you use to separate the mixture of the two liquids?
Explain how this technique would be carried out to separate the components of this mixture.
Distillation would be used to separate the mixture of two liquids having boiling points of 45°C and 86°C.
What is distillation?Separating the component substances from a liquid mixture by evaporation and condensation is called as distillation. It is one of the most common techniques for the purification and identification of organic liquids.
Distillation is used for separating a mixture of miscible liquids into its components and when the difference in the boiling points of the liquid is more than 20-25 degree Celsius. It is a physical process as it involves phase change from liquid to gas.
Following are the steps involved in distillation:
1. Converting desired liquid from a mixture into vapor.
2. Condensing the liquid that is purified.
3. Finally, collecting the condensed liquid
There are four types of distillation namely, Fractional, simple, Vacuum and Steam Distillation.
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you can increase thermal energy of a substance by heating it. hen you apply heat, you are ________ energy from the _____ source to the ________
You can increase the thermal energy of a substance by heating it. When you apply heat, you are transferring energy from one source to another.
The state of matter of a substance is an extrinsic property, which means that its surroundings can alter it. The state of matter is influenced by physical factors like pressure and temperature. A substance’s temperature rises when thermal energy is applied, changing the substance’s state from solid to liquid (melting), liquid to gas (vaporization), or solid to gas (sublimation).
Sublimation is defined as the property of a substance when it directly converts to a gaseous state from a solid state. Condensation can occur when a substance is subjected to increasing pressure. It may evaporate as a result of a decrease in pressure. Decreased pressure can also cause some forms of rock to melt.
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Find the odd one out: Give reasons why
1. Helium, argon, hydrogen. krypton
2. Lithium, nitrogen, oxygen, carbon
The odd one in the first group is hydrogen because all other elements are noble gases. The odd one in the second group is lithium since other elements are gases.
What is groups in periodic table?Groups are vertical columns containing elements of similar properties and same valency. The first two groups are metals and most of the p-block elements such as nitrogen, oxygen etc. are gases.
In the first series, except hydrogen all other elements are noble gases and belongs to the same group and in the second series except lithium all other element are gases.
Hence the odd one in first series is hydrogen and in the second series is lithium.
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How are all of Earth's water reservoirs connected to the ocean?
All of th Earth's water reservoirs connected to the ocean by the processes of evaporation and precipitation.
Evaporation and precipitation processes link the ocean to all of the earth's water reservoirs, making it a crucial component of the water cycle.
Due to the fact that all significant watersheds on Earth drain to the ocean, the ocean is linked to significant lakes, watersheds, and streams. From watersheds to estuaries and the ocean, rivers and streams carry nutrients, salts, sediments, and pollutants.
Evaporation refers to the process in which liquid is converted into gaseous state or vapours. Precipitation is the process in which gaseous vapours are turned into liquid state and are shed down on the Earth.
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How would this model be like after being separated chemically? Please help!!
A separation process is a method that divides a mixture or solution of chemical compounds into two or more different product mixtures. It is a scientific approach of separating two or more substances in order to achieve purity.
How are chemical brews divided?
Mixtures can be separated using a variety of techniques. Chromatography on a solid medium necessitates solvent separation. Distillation involves the use of several boiling points. Evaporation removes a liquid from a solution, leaving a solid behind.
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You have a solution that contains 100 ml of 1. 5 m potassium carbonate and another 100 ml solution that contains 1. 0 m fecl2 and 2. 0 m nabr. When you mix the two solutions together to form a precipitate. What is the precipitate and how much is formed assuming the insoluble product precipitates completely?.
The precipitate is iron(II) carbonate based on the solubility of all possible cation and anion combinations and based on its molar mass, 11.6g of it will precipitate.
All the potassium salts and sodium salts except sodium bicarbonate are soluble in water, therefore the precipitate is the iron(II) salt. Iron(II) bromide is soluble in water, on the other hand, iron(II) carbonate is not water-soluble. Therefore iron(II) carbonate will precipitate.
According to the given data, we have;
0.100 L × 1.5 M = 0.15 moles of carbonate ions
0.100 L × 10. M = 0.1 moles of iron(II) ions
As they react in a 1:1 ratio, there is an excess of the carbonate ions and 0.1 moles of Iron(II) will precipitate.
Now by using the molar mass, the mass of the precipitate can be calculated as follows;
M = (56 + 12 + 3 × 16) g/mol
M = 116 g/mol
n = m ÷ M
m = M × n
m = 116 g/mol × 0.1 mole
m = 11.6 g
Therefore, iron(II) carbonate is the precipitate and the mass of this insoluble product is calculated to be 11.6 g.
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PLEASE HELP, AWARDING BRAINLIEST!
The wavelength for transition in hydrogen atom is 397 nm.
1/wavelength = RH[(1/n12 )-(1/n22)]
Here RH= Rydberg constant = 109,677 cm-1
n1= 2
n2= 7
Substituting these values in the Rydberg formula we get
1/wavelength = 109,677cm-1[(1/2^2)-(1/7^2)]
1/wavelength = 109,677cm-1[(1/4)-(1/49)]
1/wavelength= 109,677cm-1[(49-4)/(49*4)]
Wavelength=( 49*4)/(45*109677) cm
Wavelength = 3.97*10^-5 cm
Wavelength= 397*10^-9 m
Wavelength= 397 nm.
Solve for the electron energy in the n = 7 plane of the hydrogen atom. So the soul you have is E equal to 13.6 divided by N square hoops. Here's an E.V that ends with a 7. All lines with a final energy level of n = 2 form a Balmer series. Going from n=5 to n=2 gives the third row of the Balmer series.
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PLEASE HELP, AWARDING BRAINLIEST!
The maximum kinetic energy of an ejected electron is 5.08 e⁻²⁰.
Total energy = threshold energy + kinetic energy.
Kinetic energy = Total energy - threshold energy
= hc/λ - hc/λ₀
= 6.64 × 10⁻³⁴ × 3 × 10⁸( 1/312 - 1/339) × 10⁹ J
= 0.00508 × 10⁻¹⁷ J
Into three significant figures = 5.08 × 10⁻²⁰
or 5.08 e⁻²⁰.
The threshold wavelength is the most wavelength that the incident radiation should have so that the photoelectric effect takes region. The painting's characteristic is defined as the minimal electricity had to take away an electron from the strong to a degree in vacuum immediately outdoors the surface of the stable.
The threshold frequency is defined because the minimum frequency of incident radiation underneath which the photoelectric emission is not feasible absolutely. regardless of the depth of incident radiation.
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Examine the electron configurations of oxygen, phosphorus and gallium. According to valence bond theory, how many bonds could each of these atoms form?.
Oxygen forms two bonds and the configuration is 1s₂ 2s₂ 2p₄, Phosphorus forms three bonds and the configuration is [Ne]3s₂ 3p₃, and Galium forms four bonds and the configuration is [Ar] 3d₁₀ 4s₂ 4p₁
What is valence bond theory?Chemical bonding is described by this idea. According to VBT, an atomic bond between two atoms is created when incompletely filled atomic orbitals overlap.Upon sharing the unpaired electrons, a hybrid orbital is created.Valence bond theory states that the metal atom or ion can employ its (n-1)d, ns, np, and nd orbitals for hybridization under the effect of ligands to produce a set of equivalent orbitals with specific geometry, such as octahedral, tetrahedral, square planar, etc.Bonding is explained in terms of hybridised orbitals of the electron in the valence bond (VB) theory, which was developed in major part by the American scientists Linus Pauling and John C. Slater.The Lewis notion of the electron-pair bond serves as the cornerstone of VB theory.Therefore,
Oxygen forms two bonds and the configuration is 1s₂ 2s₂ 2p₄
Phosphorus forms three bonds and the configuration is [Ne]3s₂ 3p₃
Galium forms four bonds and the configuration is [Ar] 3d₁₀ 4s₂ 4p₁
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HURRY PLEASE DUE IN HOUR? Determine the mass, in grams, of 0.425 moles of Co (1 mol of Co has a mass of 58.93 g).
Answer:26.2 grams
Explanation:We have 58.93 grams per mole cover so from here we'll be able to cancel moles of coat, and the remaining unit in the numerator will be gram which is our desired unit and then multiplying these 2 numbers 0.445 multiplied by 58.93. We should get 26.2 grams.
plant cells can use energy from the sun to make food. animal cells cannot. which organelle is responsible for this difference between plant and animal cells? HELP PLEASE
Answer:
Chlorophyll.
Explanation:
Chlorophyll is also why plants are green.
Pls mark brainliest with the crown
Chloroplasts are the food producers of the cell. The organelles are only found in plant cells and some protists such as algae. Animal cells do not have chloroplasts. Chloroplasts work to convert light energy of the Sun into sugars that can be used by cells.
:)
How do ionization energies provide evidence for the quantization of the energies of electrons?.
Ionization energies provide evidence for the quantization of the energies of electrons by taking a specific amount of energy to remove exactly one electron from an atom.
Quantization of energy:
An electron can radiate or absorb energy as radiations only in limited amounts or bundles called quanta. This is known as quantization energy
The formula for quantization of energy:
E = hf
E = energy
f frequency
h = plank's constant
As we know the motion of the electron in the hydrogen atom is not free. The electron is bound to the atom by the attractive force of the nucleus and consequently, quantum mechanics predicts that the total energy of the electron is quantized. There is an approximate amount of energy that is needed to overcome the attractive force between the electrons and the nucleus.
If less than the required ionization energy then the electrons can not be removed.
Therefore Ionization energies provide evidence for the quantization of the energies of electrons by taking a specific amount of energy to remove exactly one electron from an atom.
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Balance the chemical reaction
using an atom inventory.
What is the coefficient for
aluminum?
[?]AI + [ ?]Cl₂ →→ [?]AICI3
Answer:
reactants. product
Al(1) Al(1)
Cl(2) Cl(3)
2Al+3Cl2 ---> 2AlCl3
reactants. product
Al(2) Al(2)
Cl(6) Cl(6)
In a balanced chemical equation, the mass and the charge are both equal. Here the balanced equation is 2Al+3Cl₂ → 2AlCl₃. Here the number of Al and Cl on both sides of the equation are equal.
A balanced chemical equation, in which the masses of the reactants and products are equal, contains the same amount of atoms of each element on both sides of the equation. In other words, both sides of the reaction have an equal balance of mass and charge.
Making both sides of the reaction, the reactants and the products, equal in the number of atoms per element is the ultimate goal of balancing chemical equations.
In order to balance the equation, Al+Cl₂ → AlCl₃, multiply 'Al' and 'AlCl₃' by 2 and Cl₂ by 3. So that the number of 'Al' atoms becomes 2 and 'Cl' atoms becomes 6.
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consider the given balanced equation. n 2 3 h 2 ⟶ 2 n h 3 how many moles of ammonia are formed when 4 moles of nitrogen react? select one: 8 4 2 1
From the balanced equation, 8 moles of ammonia are formed when 4 moles of nitrogen react.
N₂ + 3H₂ ⇒ 2NH₃
That's the balanced equation in the question. A mole in a chemical equation is usually denoted by the coefficient of each substance. From the equation, one mole of Nitrogen reacted with three moles of hydrogen to produce 2 moles of ammonia. Using this information, we can produce a mole ratio. A mole ratio is the ratio of the number of moles of one reactant required to completely react with another reactant or the ratio of the number of moles of one product produced to another product.
The mole ratio in the above equation is
1 : 3 : 2
To easily find how many moles of ammonia are formed when 4 moles of nitrogen react:
1 mole of Nitrogen = 2 moles of ammonia
4 moles of nitrogen = x moles of ammonia
Therefore, x = 4 x 2/1 = 8 moles of ammonia.
Thus, 8 moles of ammonia are formed when 4 moles of nitrogen react.
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in nuclear reactions, information about the nuclei that take place in the reaction and the nuclei that are produced can be written out in an equation form. when looking at equations like this, how can you identify a reaction as a fission reaction?
By looking at a nuclear reaction, a fission reaction can be easily identified as it shows the breakdown of a larger atom into two or more smaller nuclei.
What is nuclear reaction?it is the formation of one or more new nuclides by the collision of two nuclei or external subatomic particles. Nuclear reactions are of two types:
Nuclear fission reaction Nuclear fusion reactionIn nuclear fission reaction, a heavier nucleus splits into several smaller lighter nuclei fragments and two or more neutrons. These fragments, or fission products, are either equal to or half of the original mass of the atom The reaction proceeds with a very high emission of energy.
[tex]238_{92}[/tex]U → [tex]234_{90}[/tex]Th + [tex]4_{2}[/tex][tex]\alpha[/tex]
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WORTH 100 POINTS !!!
What does it mean when a reaction reaches equilibrium?
Explanation:
A reaction at equilibrium essentially means that the number of reactants and products is constant (but not necessarily equal) and continue to be constant until a change is imposed on the system.
List these drinks in order of kinetic energy, starting with
the drink whose particles have the highest kinetic
energy.
Drink
Hot Chocolate
Milk
Juice
Water
Intro
Temperature
(in °C)
50
35
40
15
O hot chocolate, water, juice, milk
hot chocolate, juice, milk, water
Owater, milk, juice, hot chocolate
O water, hot chocolate, juice, milk
The correct order for the kinetic energy of the drinks is hot chocolate, juice, milk, and water at their respective temperature ie. option b.
What is kinetic energy?
The energy that a body has because it is moving is called kinetic energy.
The kinetic energy is directly related to the temperature. Therefore, the temperature means more kinetic energy.
Since the hot chocolate has the highest temperature followed by juice and then milk and water.
Hence, the correct answer is option b
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3. Comparing and Contrasting The compound
in blood that carries oxygen to cells throughout
the body contains iron. Iron has an atomic number
of 26. Iron-59 is used to diagnose disorders in the
blood. How is iron-59 different from all other
isotopes of iron? How is it the same?
HELPP ASAP
Its is different because Iron-59 contains 33 neutrons. We also call it the same because it has 26 protons.
Due to its 33 neutrons, iron-59 differs from other iron isotopes. Due to the fact that all isotopes have 26 protons, they are all the same.
What are Isotopes?
Isotopes two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.
Hence, Iron-59 is different form other isotopes of iron because it contains 33 neutrons. It is the same as other isotopes because they all contain 26 protons.
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what is the ratio of constants at 25 c for two reactions a and bif the standard free energy of activiation of reaction a is 28 kj/mol less than that of reaction b
The ratio of the constants for the two reactions is found to be 7.10 by using the Arrhenius equation.
The Arrhenius equation is [tex]k = A e^\frac{-Ea}{RT}[/tex], where A is the frequency or pre-exponential factor and [tex]e^\frac{-Ea}{RT}[/tex] is the proportion of collisions at temperature T that have enough energy to overcome the activation barrier (i.e., have energy higher than or equal to the activation energy Ea).
The exponential part in the Arrhenius equation means that when the activation energy diminishes, the rate constant of a reaction grows exponentially. Because the rate of a reaction is exactly proportional to its rate constant, the rate also grows exponentially. Because a reaction with a low activation energy requires less energy to reach the transition state, it should occur more quickly than a reaction with a higher activation energy.
Given:
T = 25℃ = 25 + 273 = 298K
[tex]Ea^B - Ea^A[/tex] = 28kJ/mol = 28000J/mol
R = 8.314J
To find:
kA / kB = ?
Formula:
[tex]k = A e^\frac{-Ea}{RT}[/tex]
Calculations:
From Arrhenius equation,
kA = [tex]A e^\frac{-Ea^A}{RT}[/tex]
kB = [tex]A e^\frac{-Ea^B}{RT}[/tex]
kA / kB = [tex]e^\frac{Ea^B - Ea^A}{RT}[/tex]
kA / kB = [tex]e^\frac{28000}{8.314 * 298}[/tex]
kA / kB = 7.10
Result:
The ratio of the constants is found to be 7.10
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is it possible for rocks to keep growing and spread if not broken down
Answer:
The rock helps smother unwanted plant growth, but some stubborn weeds find a way to thrive. Weed prevention starts before you put the rocks down and continues with regular maintenance to stop a large-scale weed invasion.
Explanation:
HOPE IT HELPS YOU
describe a shell model of a lithium atom (li), which has 3 protons. predict whether the majority of lithium atoms on earth are uncharged, positively charged, or negatively charged.
Majority of lithium atoms on earth are positively charged.
What is the charge of lithium?3 protons and 3 electrons respectively, make up a lithium atom. It might become an ion if one of its electrons is lost. It now has a net positive charge since there are more positive protons than negative electrons. It is a positive ion as a result.
What is lithium atom?An atom of the chemical element lithium is known as a lithium atom. Three electrons connected by the electromagnetic force to a nucleus with three protons and either three or four neutrons, depending on the isotope, are what make up stable lithium. The nucleus is held together by strong force.
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1. How do people in America remember their heroes? (1 point)
Oby eating birthday cake
Oby doing special dances
Oby celebrating special holidays
Oby traveling to different countries
2. What did Martin Luther King. I want for all peopl
calculate the volume of 0.2m naoh required to bring the ph of 20 ml of 5% acetic acid solution to 4.74, which is the pka of acetic acid.
Volume required is 41.625 ml of 0.20M NaOH must be added to the 20 ml of 5%. acetic acid solution to bring the pH to 4.74.
Solution -
Step 1: To calculate molarity of acetic acid in100 mL of solution
Molar mass of acetic acid = 60.0591 mol
No. of moles of acetic acid = mass of acetic acid ÷Molar mass of acetic acid
=5g÷60.05g/mol
moles of acetic acid 0.08326 mol
Molarity of acetic acid =moles of acetic acid/ Vol of sol" (in L)
=0.08326 mol/L÷0.1L
=0.8326mol/L
Molarity of 20 mL of 5% acetic acid solution = (20 mL) x 0.8326 mol /L
= 0.01665 mol/L
Step 2 :To calculate volume of 0.20 M NaOH required.
Let 'v' liters of 0.20 M NaOH was added to the acetic acid solution.
New Molarity of NaOH, x = (V x 0·20) M -equation (1)
Given: pH=4.74 ,pka=4.74
Henderson-Hasselbalch equation is:
[tex]pH = pK_a + log10([A^-] / [HA])[/tex]
[A⁻] = conjugate base
[HA] = acid
Acetic acid + NaOH → Sodium acetate + H2O
Initial 0.01665 M xM 0 M
change -x -x +x
Final 0.01665-x 0 xM
pH=pK a +log [Sodium acetate] [acetic acid]
4 * 74 = 4 * 74 + log(x/(0.01665 - x))
0 = log(x/(0.01665 - x))
Taking antilog both
[antilog (0) = 1]
1 = x / 0.016C5-x
0.01665 - x = x
x = 0.008325 M
New So, Molarity of NaOH = 0.008325 M
From equation (1).
New Molarity of NaOH = V ×0.20M
=0.008325 V × 0.20
V= 0.041625 L
V= 41.625 mL
Thus the volume will be V= 41.625 mL
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In a constant-pressure calorimeter of negligible heat capacity, 25 ml of 1. 00 m cacl2 is mixed with 25 ml of 2. 00 m kf, resulting in solid caf2 precipitating out of the solution. During this process, the temperature of the water rises from 25. 0°c to 26. 7°c. Assume the specific heat capacity of the solution is 4. 184 j/°c•g and the density of the solution is 1. 00 g/ml. Calculate the enthalpy of precipitation in kj per mole of caf2 precipitated.
Answer:
q = mC∆T
m = mass = 25 ml CaCl2 + 25 ml KF = 50 ml x 1.00 g/ml = 50 g
C = 4.184 J/g-deg
∆T = 1.7 deg
q = (50 g)(4.184 J/g-deg)(1.7 deg) = 355.6 J
Looking at the chemical reaction: CaCl2(aq) + 2KF(aq) ==> CaF2(s) + 2KCl(aq)
moles CaCl2 present = 0.025 L x 1.00 mol/L = 0.025 mol CaCl2
moles KF = 0.025 L x 2.00 mol/L = 0.05 mol KF
Neither reactant is limiting as they are both present in stoichiometric quantities. Thus, moles CaF2 formed will be 0.025 moles CaF2 formed.
∆Hppt = 355.6 J/0.025 moles = 14,224 J/mole = 14.2 kJ/mole