when 70.0 g of li3n(s) reacts with excess h2(g), 8.0 g of linh2 (s) is produced. The percent yield is closest to 17%
How to calculate the percentage yield
The reaction between Li3N(s) and LiH(s) is given as:
Li3N+3H2 = 3LiH + NH3
Calculate the moles of Li3N
Moles = Mass/Molar mass
Moles = 70/35
Moles = 2 moles
From the reaction you can see that 1 mole of Li3N produce 3 moles of LiH, hence the moles of LiH is 6 moles
Determine the mass of LiH (theoretical yield)
Mass of LiH = 6 * 7.95
Mass of LiH = 47.7g
%yield = actual/theoretical * 100
%yield = 8/47.7 * 100
%yiels = 16.77%
Hence the percent yield is closest to 17%
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What should you do every time you are setting up glassware for a vacuum filtration?
Select one or more:
1. Check that there are no cracks or defects in the glassware.
2. Ensure that the glassware is designed for use with a vacuum.
3. Dry the outside of all the glassware.
4. Inspect the tubing for any holes.
According to the statement you do every time you are setting up glassware for a vacuum filtration are:
1. Check that there are no cracks or defects in the glassware.
2. Ensure that the glassware is designed for use with a vacuum.
3. Inspect the tubing for any holes.
What is the purpose of vacuum filtration?By removing the air beneath the filter paper, vacuum filtration maintains a pressure differential across the filter media. Filtration under a vacuum accelerates the process and exerts a force on the mixture in addition to gravity.
What situations call for vacuum filtration?The collection of a particle (bacteria, precipitate, etc.) from with a liquid suspension typically involves vacuum filtration in microbiological and laboratory operations.
What distinguishes vacuum filtration from gravity filtration?Vacuum and gravity filtering differ primarily in their efficiency and mode of operation. The filtration is powered by one technique, which employs a vacuum source, and by the other, which uses gravity. Vacuum filtering becomes quicker and more practical as a result. However, it doesn't apply to all experiments.
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what is the net ionic equation for the complete neutralization reaction between the strong acid hno3 (aq) and the strong base ba(oh)2 (aq)? what is the driving force for the reaction?
The balanced chemical reaction for the complete neutralization between HNO₃ and Ba(OH)₂ is given as,
2 HNO₃ (aq) + Ba(OH)₂ (aq) → Ba(NO₃)₂ + 2 H₂O
Balanced equations
In order to balance the equation, the component atoms in the reactants and products must be the same in terms of number and mass.
Thus, in the above chemical equation, the number atoms of H, N, O, and Ba in the reactants and the products must be equal.
Therefore, the overall equation for the chemical reaction is,
2 HNO₃ (aq) + Ba(OH)₂ (aq) → Ba(NO₃)₂ + 2 H₂O
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Double Replacement Worksheet
If an aqueous solution of lead(II) nitrate (Pb(NO3)2) is mixed with an aqueous solution of potassium chloride (KCl) the precipitate is?
1. K(NO3)2.
2. KNO3.
3. No precipitate is formed.
4. PbCl.
5. PbCl2.
If an aqueous solution of lead ( II ) nitrate ( Pb ( NO₃ )₂ ) is mixed with an aqueous solution of potassium chloride ( KCl ) the precipitate is PbCl₂. Therefore, option 5 is correct.
What is potassium chloride ?A metal halide salt made of potassium and chlorine is known as potassium chloride (KCl, or potassium salt). It looks like a white or colorless vitreous crystal and has no smell. The material easily dissolves in water, and its solutions taste salty.
Potassium nitrate and lead chloride are produced when aqueous KCl and lead nitrate ( Pb ( NO₃ )₂ ) combine. Because PbCl₂ is soluble in water but precipitates out, the metathesis reaction has taken place.
As a result, option 5 is correct.
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click and drag to indicate whether each electrolyte is intracellular or extracellular and whether each is positively charged or negatively charged.
Potassium is positively charged inside the cell, sodium is positively charged outside the cell, phosphate is negatively charged inside the cell, and chloride is negatively charged outside the cell.
What transpires if your body is deficient in electrolytes?Blood clotting, muscular movements, acid equilibrium, and fluid control can all be affected when your body is low on electrolytes. Electrolytes aid in the regulation of your heartbeat because your heartbeat is a muscle.
How can electrolytes be replenished most effectively?Drinks like isotonic drinks, milk, apple juice, other juice drinks can all help with electrolyte balance and hydration. For the majority of people, maintaining electrolyte levels only necessitates a well-balanced diet and enough water to drink.
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Fill in the [?]: 6.50 m = [?] cm
Answer:
650cm
Explanation:
1m = 100cm
6.50m = 650cm
ingeborg is taking a benzodiazepine for gad. which description is least likely to apply to ingeborg's reaction?
Benzodiazepine is taken for GAD. The least likely description would likely to apply to Ingeborg’s reaction is: C. Therapeutic effects may be no stronger than those obtained with a placebo.
Which is better, benzodiazepine or placebo?Both benzodiazepine and placebo could help in treating GAD and other panic disorders in adults. Their therapeutic effects include anxiety reduction, maintenance of sleep, seizure prevention, and muscle relaxation. However, many authors and researchers agree that benzodiazepines are more effective and have a stronger effect than placebo. Therefore, the correct answer is C.
This question seems incomplete. The complete options of the query are as follows:
“Ingeborg is taking a benzodiazepine for GAD. Which description is least likely to apply to Ingerborg’s reaction?
a. GAD symptoms will begin to subside about 6 hours after beginning the drag.b. Side effects such as drowsiness and physical dependence will occur.c. Therapeutic effects may be no stronger than those obtained with a placebo.d. Lasting reductions in chronic worry will not be obtained.”Learn more about benzodiazepines here https://brainly.com/question/29734512
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to answer this question, you may reference the metabolic map . a fatty acid composed of 16 carbon atoms undergoes β‑oxidation. how many acetyl coa, fadh2, and nadh does β‑oxidation of this fatty acid generate?
8 acetyl-CoA molecule, 7 NADH molecules, with 7 FADH2 molecules are produced as a result of this.
What uses does carbon serve?Coal, gasses, and hydrocarbons are all utilized as fuels. It is used to create a variety of products, including plastic and steel alloys (a combination of carbon and iron). Even black ink for computers and painting is produced with it.
Who or what makes up carbon?The nucleus of a carbon atom is made up of six protons and six neutrons, and it is encased in six electrons. According to quantum physics, the first excited elements must occupy the innermost atomic orbit, while the wavefunctions of the following four electrons only partially fill the ii standard and 2 minute primary orbitals.
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Water and Air Masses
Air mass classification involves three letters. The first letter describes its moisture properties: continental air masses (c) and maritime air masses (m). The second letter is its source region: tropical (T), polar (P), arctic or Antarctic (A), monsoon (M), Equatorial (E), and superior (S) air. For instance, an air mass originating over the desert southwest of the United States in summer may be designated "cT"and an air mass originating over northern Siberia in winter may be indicated as "cA." The stability of an air mass may be shown using a third letter, either "k" (air mass colder than the surface below it) or "w" (air mass warmer than the surface below it).
PART A:In meteorology, an air mass is a volume of air defined by its temperature and water vapor content. Air masses cover many hundreds or thousands of miles, and adapt to the characteristics of the surface below them. Which statement INCORRECTLY describes air masses?
Responses
A Tropical air masses form near the equator and the air is warm.Tropical air masses form near the equator and the air is warm.
B Maritime air masses form over water and become dry as they lose water vapor to the water below it.Maritime air masses form over water and become dry as they lose water vapor to the water below it.
C Polar air masses form far from the equator where air becomes cool as it loses energy to the cold land or water.Polar air masses form far from the equator where air becomes cool as it loses energy to the cold land or water.
D Continental air masses form over land and are dry as it loses its moisture to the dry land below it.
PART B:When an air mass moves to a new region, it carries along its characteristic moisture and temperature. As the air moves over Earth’s surface, the characteristics of the surface begin to change the air mass. When a new air mass moves over an area, you can expect the weather to change. A front is a boundary between air masses. How would the weather change if a cold front moves into your area? All BUT ONE may apply.
Responses
A Weather changes rapidly.Weather changes rapidly.
B Temperatures drop.Temperatures drop.
C Rain is unlikely.Rain is unlikely.
D Wind becomes gusty.
In part A, the statement that incorrectly describes air masses is option C, Polar air masses form far from the equator where air becomes cool as it loses energy to the cold land or water.
Part B, the option that does not apply to the weather change if a cold front moves into an area at a front is option C, Rain is unlikely.
What happens when cold fronts move to a new region?When boundaries between air masses or cold fronts moves they cause changes to the weather, wind becomes gusty, heavy rain that sometimes come with hails and thunder as well as drop in temperature occurs.
Polar air masses are known to form only in areas with high latitudes and near the equator.
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What are the conditions that cause hail to fall?
unstable air that move water droplets through layers of warm and freezing air repeatedly
stable moist air and layers of freezing air causing water drops to fall repeatedly through the layers
warm moist air circulating over a cold front, mixing water droplets with freezing air
a cold front moving over a freezing layer of air that causes droplets to freeze repeatedly
The conditions that cause hail to fall are unstable air that move water droplets through layers of warm and freezing air repeatedly. Therefore, option A is correct.
What is droplet ?The temperature determines whether water vapor will condense into droplets. The dew point is the temperature at which droplets begin to form. The atmospheric water vapor condenses to create tiny droplets on the surface when the temperature of the surface falls until it eventually reaches the dew point.
When a water droplet is lifted by an updraft from a thunderstorm over the freezing point of the atmosphere, hail is created. The super-cooled water or water vapor that the frozen water droplet accretes later freezes when it comes into contact with it. A hailstone grows as a result of this process.
Thus, option A is correct.
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Answer:
Explanation:
unstable air that move water droplets through layers of warm and freezing air repeatedly
3. A sample of water has the following concentration of ions (and the pH is near neutral): (a) (1 pt) Calculation all concentration in mg/L as CaCO3 Cations (b) (0.5 pt) What is the total hardness (TH)? Ca2+ (c) (0.5 pt) What is the carbonate hardness (CH)? Mg2+ (d) (0.5 pt) What is the noncarbonate hardness (NCH)? (e) (0.5 pt) What is the total dissolved solids concentration? (f) (2 pt) Draw an ion concentration bar graph. mg/L 95.0 26.0 15.0 Anions HCO3 SOX Cl- mg/L 160.0 135.0 73.0 Na +
The carbonic hardness is 131.1475 mg/L, non carbonic hardness is 243.442 mg/L and total hardness is 345.833 mg/L.
Anions - they're shaped when non-metal profits the electrons. They benefit one or a couple of electron. consequently, they own a net poor price. a few examples of anions are Iodide (I–), chloride (Cl–), hydroxide (OH–).
Calculation:-
Total hardness - is sue to multivalent cations.
The multivalent cations in the given questions are Ca²+ and Mg ²+.
= 237.5 + 108.33
= 345.833 mg/L of CaCo3.
Carbonceous hardness - is due to HCO3-
Therefore carbonaceous = 160/60/1 (100/2) as CaCO3
= 131.1475 mg/L
Non carbonaceous hardness - is due ti cl- and SO4- anions.
= 135/96/2 × 100/2
= 243.442 mg/L as CaCo3.
Carbonate is a polyatomic anion with the components CO2−3 and has a trigonal planar molecular shape which includes a carbon atom surrounded via 3 oxygen atoms. The carbonate ion is a reasonably sturdy base, so through definition of a Lewis base, it draws protons in aqueous solutions.
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Double Replacement Worksheet
Aqueous solutions of sodium sulfate (Na2SO4) and barium chloride is mixed. What is the precipitate?
1. No precipitate will form.
2. NaCl
3. Na2SO4
4. BaSO4
5. BaCl2
Aqueous solutions of sodium sulfate ( Na₂SO₄ ) and barium chloride are mixed, then the precipitate formed is barium sulphate ( BaSO₄ ). Therefore, option 4 is correct.
What is barium sulphate ?The inorganic substance having the chemical formula BaSO4 is called barium sulfate. It is a tasteless, crystalline white substance that is insoluble in water. The main commercial source of barium and the materials made from it is the mineral barite, which is where it naturally occurs.
Barium sulfate and sodium chloride are created when barium chloride (BaCl2) and sodium sulfate (Na2SO4) react. The above-mentioned reaction produces a white precipitate as a result of the creation of barium sulphate.
Thus, option 4 is correct,
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most of the substances we use for fuel are hydrocarbons that burn easily in the presence of oxygen.which two elements are found in these substances?responseshydrogen and carbonhydrogen and carboncarbon and oxygencarbon and oxygenhydrogen and oxygen
We use for fuel are hydrocarbons that burn easily in the presence of oxygen, Hydrogen and Carbon elements are found in these substances. These fossil fuels are found in the Earth’s crust and contain carbon and hydrogen, which can be burned for energy.
What is fossil fuel?
Fossil fuel is a hydrocarbon-containing substance formed naturally in the Earth's scab from the escapes of dead plants and animals that is liquid and burned as fuel. The major fossil fuels are coal, oil, and natural gas.
What is energy?
Energy is the quantitative possession that is changed to a body or to a physical system, identifiable in the performance of work and in the form of heat and light.
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What’s the answer to this ?
Carbon Dioxide
Force: London
Sublime: -78.5 C
Hydrogen Fluoride
Force: dipole-dipole
Sublime: 19 C
Calcium Chloride
Force: ionic
Sublime: cannot sublime
Naphthalene
Force: London
Sublime: 80 C
Water
Force: hydrogen bond
Sublime: 0
chemist carries out this reaction and obtains 11.4 g of tungsten. if the percent yield is 89.4%, what mass of wo3 was used?
16.1g mass of WO3 was used.
What is mass?
The quantity of matter in an object is expressed in terms of mass. Grams (g) or kilograms are commonly used to measure mass (kg). Regardless of the object's position in the universe or the gravitational field acting on it, mass measures the amount of matter present.
Weight and mass are frequently conflated terms. Although they measure various things, they are closely related. Weight measures the force of gravity acting on an object, as opposed to mass, which measures how much matter is there in an object.
An object's gravitational pull is determined by its mass as well as the gravitational field's strength. An object's mass and weight are exactly related if the force of gravity is held constant (which it is everywhere on Earth). Therefore, an object with a higher mass will likewise weigh more.
The mass of tungsten obtained (11.4 g) is 89.4% of the theoretical yield. Therefore, to calculate the mass of WO3 used, we need to divide 11.4 g by 0.894 to find the theoretical yield and then multiply it by 1.00 to find the mass of WO3 used.
Therefore, the mass of WO3 used = (11.4 g / 0.894) x 1.00 = 16.1 g
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draw the product formed when the following alkene is treated with either [1] hbr alone and [2] hbr in the presence of peroxides.'
Alkyl bromides are created when an alkene and HBr interact in the presence of factors such as heat, sunshine, or peroxides. A radical intermediate is used in this reaction to progress.
What is Alkene?
Alkenes, and ethene in particular, play a crucial role in the chemical industry. They are created during the cracking of the alkanes but are not present in significant amounts in crude oil. Like all hydrocarbons, alkenes burn in the presence of air to produce carbon dioxide and water. Ethene reacts violently in oxygen, making it ineffective as a fuel. Additionally, the alkenes are too useful for the production of plastics and many other compounds to be used as fuels in the chemical industry.
Compound A reacts with HBr to produce 2-bromohexane as a byproduct. 1-Bromohexane is created when component an interacts with HBr and peroxide.
In the absence of light, the carbocation intermediate is used to add HBr. In the presence of light, the radical intermediate is used to add HBr.
The result of component B reacting with HBr is 1-bromo-1-methylcyclohexane. 1-Bromo-2-methylcyclohexane is produced via the reaction of component b with HBr and peroxide.
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at 25 °c, only 0.0220 mol of the generic salt ab3 is soluble in 1.00 l of water.what is the Ksp of the salt at 25 °c?ab3(s)↽−−⇀a3 (aq) 3b−(aq)
According to the given statement The solubility product Ksp of the salt at 25 °c is 6.31 x 10–6 .
What does "solubility product" mean?The equilibrium characteristic for the dissolution of a solid into an aqueous solution is known as the solubility product constant, abbreviated KSP or the Product In a particular. It is represented by Ksp. The solubility product, a sort of equilibrium variable, varies in value with temperature.
Briefing:Since 1.0 mol of the solid salt creates 1.0 mol of A+3 ion (cation) after dissolving in water, 0.022 mols of the salt will result in 0.022 mols of A+3 (direct proportion). [A+3] = 0.022 mols/liter, or 0.022 M, follows.
On the other hand, 3 mols of the B- anion will be produced from 1 mol of the solid salt. As a result, also by direct proportion, 3 x 0.022 = 0.066 mol of B- will be produced from 0.022 mols of the solid salt. Consequently, [B-] = 0.066 M
The Solubility Product, Ksp will finally be:
Ksp = [A+] [B– ]^3 = [0.022] [0.066]^3
So, Ksp = 6.31 x 10–6
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From the given lewis structure and what you know about vsepr theory, identify the shape of the molecule.
According to VSEPR theory the shape of the molecule is trigonal bipyramidal.
What is the VSEPR theory?The VSEPR theory postulates that the shape of a molecule can be predicted by the electron pairs that surround the central atoms of the molecule. The valence shell electron pair repulsion (VSEPR) uses 3-D molecular geometry.
The VSEPR is a geometry that minimizes repulsion between electrons. The shape of the molecule is "trigonal bipyramidal" because of the presence of 2 single bonds in the X atom atom attached to the Y atom. The 5 main shapes of VSEPR are linear, trigonal planar, tetrahedral, trigonal bipyramidal and octahedral.
The full question is:
A Lewis structure is a two-dimensional representation of a molecule that does not necessarily show what shape that molecule would take in three dimensions. From the given Lewis structure and what you know about VSEPR theory, identify the shape of the molecule. A molecule with atom Y single bonded with 2 X substituents. The Y atom has two lone pairs.
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glacial acetic acid is a minimum of 96% acetic acid by mass. calculate the molarity of a 97.62 (m/m) % acetic acid solution given that the solution density is 1.05 g/ml.
The molarity of a 97.62 (m/m) % acetic acid solution given that the solution density is 1.05 g/ml is 17.5M.
Reason:
Glacial acetic acid is 100% acetic acid. The MW of acetic acid is 60. The density of acetic acid (100%) is 1.05. So in 1 L we have 1.05 Kg. The number of moles of acetic acid is then 1050 g divided by 60 = 17.5 mol. So the molarity is 17.5 mold/L or 17.5 M.
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what is the pressure in a region of outer space where there is 2 molecule/cm3 and the temperature is 5 k ?
When the temperature is 5 k and there are 2 molecules per cm3, the pressure is 1.38*1016 Nm2.
What degree of heat is too much for people?
People frequently cite a 2010 study that concluded that the highest limit of safety, above which the human body can no longer cool itself by draining sweat from the body's surface, would be a wet-bulb temperature of 35 C, or 95 F at 100% humidity or 115 F at 50% humidity.
Where on earth is it the hottest?
The world's hottest air temperature was recorded at Death Valley: Temperatures in the California desert's aptly called Furnace Creek region peaked on July 10th, 1913, at
Briefing:
P = nKT/V
= 2*1.38*10⁻²³*5/10⁻⁶
= 1.38*10⁻¹⁶ Nm⁻²
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draw the correct lewis structure for hcn (1.5 points) describe the steps involved (1.5 points), and give its vsepr geometry (1 point).
lewis structure for Hydrogen cyanide (hcn)is H-C≡N: is based electrons present in molecule
Step 1: Determine the total number of valence electrons. Step 2: Write the skeleton structure of the molecule. Step 3: Use two valence electrons to form each bond in the skeleton structure. Step 4: Try to satisfy the octets of the atoms by distributing the remaining valence electrons as nonbonding electrons. Hydrogen cyanide has linear molecular geometry with bond angles of 180 degrees. As hydrogen and nitrogen tend to be far from each other, hydrogen cyanide HCN forms a linear shape.A colorless, quickly lethal vapor or liquid with the odor of bitter almonds, hydrogen cyanide is very deadly.production are a few notable applications.The atom's negatively charged particles are called electrons.
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choose the molecule or compound that exhibits dispersion forces as its strongest intermolecular force. a) cl2 b) co c) hbr d) nacl
In addition to the London Dispersion Force, which is Cl2, the molecule or compounds CO, HF, and NaCl also possess additional intermolecular forces of attraction.
What are examples and compounds?a material created through the chemical bonding of two or more distinct components. Compounds include things like water, which is a combination of oxygen and hydrogen and salt, which is a combination of sodium and chloride. Table salt, water, and carbon dioxide are a few examples of compounds.
Which four sorts of compounds are there?Covalent bonds hold together molecules, ionic bonds hold together ions, metallic bonds hold together intermetallic compounds, and coordinate covalent bonds hold coordination complexes together. Compounds that are not stoichiometric represent a contentious edge case.
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a compound is composed of carbon and hydrogen and has an empirical formula of ch. the molar mass of the compound is experimentally determined to be 78.12 g/mol. what is the molecular formula for the compound?a compound is composed of carbon and hydrogen and has an empirical formula of ch. the molar mass of the compound is experimentally determined to be 78.12 g/mol. what is the molecular formula for the compound
Molecular formula=n×(empirical formula)
We take the given empirical formula, work out its mass, and then solve for n.
And thus the molecular formula ≡ (CH)6 or C6H6.
What is a chemical compound?
A chemical compound is a substance made of numerous similar molecules (or molecular entities) joined by chemical bonds and comprising atoms from various chemical elements. Therefore, a molecule made up of only one type of atom is not a compound.Chemical reactions, which may entail interactions with other molecules, can change a compound into a distinct substance. Atomic bonds may be shattered or new ones created during this process.Compounds can be divided into four main categories based on the bonds that hold their individual atoms together. Covalent bonds hold together molecules, ionic bonds hold together ions, metallic bonds hold together intermetallic compounds, and coordinate covalent bonds hold coordination complexes together.To know more about chemical compounds, click the link given below:
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na and k both use to passively diffuse across the plasma membrane. leak channels voltage-gated channels facilitated diffusion exocytosis carrier-mediated transport
Both Na and K use passive diffusion across the plasma membrane to leak channels.
The plasma membrane, also known as the cell membrane, is the membrane that separates the interior of a cell from its external environment. It may be found in all types of cells. A cell wall connects the plasma membrane to the outside of both bacterial and plant cells. The plasma membrane protects the cell from its surroundings while simultaneously controlling cellular mobility and sending signals. The plasma membrane, according to the fluid mosaic model, is a patchwork of phospholipids. Non-gated ion channels are ones that are always open. Because they simply allow ions to pass through the channel without causing any damage.
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18. 7 l n2 at 25oc and 125 kpa and 41. 9 l o2 at 25oc and 125kpa were transferred to a tank with a volume of 7. 00 l. What is the total pressure (in kpa) at 65oc?.
Its pressure distribution (in kpa) for 65 °C is P=13.32atm after 18.7 l n2 with 41. 9 l o2 and 25 °C and 125 kpa was transported to a container with such a capacity of 7. 00 l.
What is pressure and its types?A physical force applied to an object is known to as pressure. For unit area, a perpendicular force is delivered to a surface of the objects. T r is the fundamental formula for pressure. Phases of project are a unit of pressure (Pa). Absolute, ambient, differential, and gauge pressures are different types of pressure.
Briefing:That number of molecules of N2 is now determined,
P₁.V₁=n₁.R.T₁
1.233×18. 7=n₁×0.0821×298
n₁=0.822 mol
In a similar manner, we determine the quantity of O2 moles.
P₂.V₂=n₂.R.T₂
1.233×41. 9=n₁×0.0821×298
n₂=1.628mol
The total number of moles of gas that must be pumped into the vessel with the dimensions of V = 4.50 L and T = 298 K equals
n=n₁+n₂
=0.822+1.628mol
=2.45mol
Let P represent the gas's final pressure,
PV=nRT
P×4.50=2.45×0.0821×298
P=13.32atm
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yet, despite the similarity in their appeareance, these two substances differ greatly in their porperties, since one is a molecular solid and the other is an ionic solid. how do the properties differ and why?
Molecular solid is a covalent bond and Ionic solid is an electronic bond.
We employ the octet rule, which states that all atoms in a compound are expected to comply by, to confirm the accuracy of any chemical structure. Every atom in the carbon IV oxide model precisely complies with the octet rule. The valence shell of each atom in the molecule is surrounded by eight electrons. We can therefore conclude that this structure is accurate given the total number of bonds and electrons, as well as the fact that CO2 has sixteen valence electrons.
Its negative charge, which is 1.602176634 coulombs, the basic unit of electric charge, is comparable to its own negative charge. The rest mass of an electron is 9.1093837015 10-31 kg, or 1/1,836 the mass of a proton.
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john weighs 85 pounds. jeff weighs 105 pounds. jake weighs 115 pounds. two of them standing together on the same scale could weigh 200 pounds.
it false john weighs 85 pounds. jeff weighs 105 pounds. jake weighs 115 pounds. two of them standing together on the same scale could weigh 200 pounds.
A pounds is defined as 16 ounces, 7,000 grains (or 0.45359237 kg) of avoirdupois weight and 12 ounces, 5,760 grains (or 0.37324171216 kg) of troy and apothecaries' weight. The letter lb comes from the Roman libra, which was the forerunner of the modern pound. The pound, also known as pound-mass, is a unit of mass that is used in both the British imperial and American customary measurement systems.
Balance Analytical These are most frequently discovered in laboratories or other locations where weighing items requires a high level of sensitivity. In analytical balances, mass is measured. Chemical analysis is always based on mass, so the results are never based on localized gravity, which would have an impact on the weight.
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what is the density, in grams per liter, of a gas with a molar mass of 28.011gmol at 281 k and 1.90 atm? .
The density of a gas with a molar mass of 28.011gmol at 281 k and 1.90 atm is 2.30 g/l or grams per liter.
The formula for the ideal gas constant is PV= nRT
[tex]\frac{P}{RT}= \frac{n}{V}[/tex] = molarity
[tex]\frac{n}{V}[/tex] = molarity
Using M = molar mass to multiply both sides, we obtain
[tex]\frac{PM}{RT} = \frac{nM}{V}[/tex]
We can write [tex]\frac{PM}{RT}[/tex]= ρ.......equation (i)
since density, ρ = [tex]\frac{mass}{volume}[/tex] and
density, ρ= [tex]molarity*molar mass (\frac{nM}{V})[/tex]
After plugging in all the numbers in equation (i), we get
ρ= [tex]\frac{ 1.90*28.011}{281*0.082}[/tex]
ρ= [tex]\frac{522090}{2304200}[/tex]
ρ= 2.30 g/l.
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Why is shampoo not harmful to hair but soap is?.
It is acidic shampoo. Not basic, but in between acidic and neutral. Because basic shampoo would be harmful in this situation. The basic ph of soap is incorrect.
Shampoo or hair soap, which is worse for hair?Once or twice will not harm your hair when you wash it with soap, but frequent washings with bar soap can lead to serious issues including roughness and severe tangles. Choose a shampoo instead to clean your hair. Dry shampoo is an excellent option for your hair if you wish to forgo shampoo.
Does soap damage hair?You can wash your hair with soap, but if you're used to using liquid shampoo, the results will probably not be satisfactory.
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what is the change in the internal energy, in joules, of the system assuming there are no other changes (such as in temperature or by the addition of fuel)?
Assuming there are no other changes to the system, the change in internal energy is 0 joules.
This is because the internal energy of a system is a measure of the total amount of energy stored within the system. If there are no changes to the system, then the amount of energy stored in the system remains the same and thus the change in internal energy is 0 joules.
The Change in Internal Energy in a Closed SystemIs a unit of measurement used to determine the total amount of energy stored within a system. This amount of energy varies depending on the work done in the system, as well as the transferred between the system and its environment. When dealing with a closed system, i.e., a system that is not affected by any external change, the change in internal energy is zero.
This is because in a closed system, there is no work done and no heat transferred to the system. This means that the total amount of energy stored within the system does not change, so the change in internal energy is zero.
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this question has multiple parts. work all the parts to get the most points. question content area when 4-dimethylaminopyridine (dmap) is added in catalytic amounts to acetic anhydride and an alcohol, it significantly increases the rate of ester formation. the process begins with a reaction between acetic anhydride and dmap to form a highly reactive acetylpyridinium intermediate that is more reactive than acetic anhydride itself. for the reaction below:
4-Dimethylaminopyridine is the extended form of DMAP in chemistry. It boils at a temperature of roughly 162 degrees Celsius. A very little over 122 g/mol is the molecular weight.
What is nucleophilic substitution reaction?
When an electron-rich nucleophile replaces a leaving group by coming into touch with a positively charged electrophile, the process is known as a nucleophilic substitution reaction.
Explanation:
Step 1: DMAP and acetic anhydride initially react in a state of pre-equilibrium.
Acetate and acetyl pyridinium ion pair are produced in the first step of the reaction. They both have high resonance stabilization.
Highly electronegative oxygen delocalizes in a structure with equal resonance energy.
Step 2:
DMAP is removed in the second stage when the alcohol that is present combines with the acyl carbon of the acetyl pyridinium to form the ester.
Acetate acts as a base to remove the proton from the alcohol by nucleophilically adding to the activated acyl pyridinium. The catalyst and the ester are produced as a result of the acetyl group's break with the catalyst. The resulting acetic acid will subsequently protonate the DMAP.
Step 3:
In the final stage of the catalytic cycle, the auxiliary base (unusual triethylamine Et N:or pyridine) deprotonated the protonate DMAP, reforming catalysis. The idea of a DMAP-dependent reaction rate is defined by catalepsies.
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