At a particular temperature, the solubility of He in water is 0.060 M when the partial pressure is 0.90 atm. 2.27 atm is the partial pressure of Kr would give a solubility of 0.150 M.
What is Henry's Law ?According to Henry's law, the weight of a gas dissolved by a liquid is proportional to the pressure of the gas onto the liquid.With very few exceptions, a solute molecule in an extremely diluted solution will only have solvent molecules as its close neighbors. This means that the likelihood that a specific solute molecule will escape into the gas phase is predicted to be independent of the total concentration of solute molecules.Solution:
The solubility of gas is directly proportional to partial pressure. It is expressed as:
S = [tex]K_ h \times P _g_a_s[/tex]
where, S = Solubility of gas
[tex]K_h[/tex] = Henry's Law constant
[tex]P_g_a_s[/tex] = Partial pressure of gas
Now, put the values in above expression we get
0.060M = [tex]K_h[/tex] × 0.9 atm
[tex]K_h[/tex] = = 0.066 M/atm
Now we have to find the partial pressure of He
0.150 M = 0.066 M/atm × [tex]P_g_a_s[/tex]
[tex]P_g_a_s[/tex] = 2.27 atm
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The emission spectrum of sodium is shown below. What do the two bright
yellow vertical lines in the spectrum show about sodium atoms?
The two lines show that these are the only two lines that do not cause energy transition in the sodium atom. Option D
What are the two lines in the spectrum of sodium atom?The spectrum of the sodium atom appears as a doublet. This implies that there are two lines in the spectrum and they appear as bright yellow lines that are not spaced apart in the spectrum.
The two bright yellow vertical lines in the spectrum shows that these are the only two lines that do not cause energy transition in the sodium atom.
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What is the bonding requirement for carbon atoms?
Answer:
carbon atoms tend to make four bonds, each carbon atom will have the number of hydrogen atoms that are required for four bonds. This compound contains 16 hydrogen atoms for a molecular formula of C 8 H 16.
Explanation:
All light is the same, whether it comes from the sun, a light bulb, or anywhere else.
All light being the same whether it comes from the sun a light bulb or
anywhere is False.
What is Light energy?This is a type of kinetic energy which makes light to be visible to the eyes.
There are different sources of light which include:
Sun• Electric bulb
Candle etc.Light from bulbs and Sun involve photons being emitted at different intensities which is why the light from both sources are different.
The Sun has more intensity and a different
intensities which is why the light from both sources are different.
The Sun has more intensity and a different source than the Light bulb.
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Lead crystallizes in the face-centered cubic lattice. What is the coordination number for pb?.
The coordination number for pb will be 12
Four atoms make up each unit cell of the face-centered cubic (fcc), which has a coordination number of 12. Two atoms make up each unit cell of the body-centered cubic (bcc), which has a coordination number of eight.
What is Coordination number ?The number of atoms, ions, or molecules that a central atom or ion in a complex, coordination compound, or crystal holds as its closest neighbours.
The number of nearby atoms or ions that surround an atom or ion is known as the coordination number. The coordination number for FCC and HCP systems is 12.Tetracarbonylnickel, Ni(CO)4, for instance, has a coordination number of 4 due to the four CO ligands that are bonded to the Ni atom.Learn more about Coordination number here:
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In the reclassify transactions screen, which 3 elements of a transaction can be reclassified?
The 3 elements of a transaction that can be reclassified are:
Account, Location ClassOn an account transaction screen, one can see there are different elements that exist and some of them are:
invoices, sales receipts, checks, or bills, etcWhat is a Transaction?This refers to the proof that exists that a person has bought a good or service and can also stand as an agreement.
Hence, we can see that On an account transaction screen, one can see there are different elements that exist and some of them are:
invoices, sales receipts, checks, or bills, etcHowever, there are only 3 elements that can be reclassified on the reclassify transactions screen and they are:
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when gas evolution becomes very slow, heat the solution gently in the hood, then allow it to cool. What gas is formed in this reaction
Nitrogen gas is formed in this reaction.
Nitrogen gasAtomic number 7 and the letter N designate nitrogen as the chemical element. Group 15 of the periodic table, often known as the pnictogens, contains nitrogen as the lightest nonmetal element. It ranks eighth in overall abundance in the Milky Way and the Solar System, making it a common element in the cosmos. Two of the element's atoms combine to create the colorless and odorless diatomic gas N2 at standard temperature and pressure. The most common element that isn't mixed, N2 makes up around 78 percent of the Earth's atmosphere. All living things contain nitrogen, which is mostly found in amino acids (and thus proteins), nucleic acids (DNA and RNA), and the energy-transfer molecule adenosine triphosphate.
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According to the modern periodic law the properties of elements are periodic function of their
Two balloons, one containing 1.54 L hydrogen gas and the other containing 0.72 L of
helium gas, are at the same pressure and temperature conditions. If the second balloon
contains 0.100 mol of helium, then the mass of hydrogen gas in the first balloon is:
A. 0.43 g
B. 0.22 g
C. 0.094 g
D. 0.047 g
Answer:
A.) 0.43 g
Explanation:
Before you can calculate the mass, you need to find the moles. You can do this by using Avogadro's Law:
V₁ / n₁ = V₂ / n₂
In this equation, "V₁" and "n₁" represent the first balloon's volume and mole value. "V₂" and "n₂" represent the second balloon's volume and mole value. Since you are searching for the first balloon's mole value, you can plug the other values into the equation and simplify to find n₁.
V₁ = 1.54 L V₂ = 0.72 L
n₁ = ? moles n₂ = 0.100 moles
V₁ / n₁ = V₂ / n₂ <----- Avogadro's Law
1.54 L / n₁ = 0.72 L / 0.100 moles <----- Insert values
1.54 L / n₁ = 7.2 <----- Simplify right side
1.54 L = 7.2 x n₁ <----- Multiply both sides by n₁
0.214 = n₁ <----- Divide both sides by 7.2
Now, you can find the mass using the molar mass of the gas. Remember, hydrogen exists as a diatomic molecule.
Atomic Mass (H₂): 2(1.008 g/mol)
Molar Mass (H₂): 2.016 g/mol
0.214 moles He 2.016 g
-------------------------- x ----------------- = 0.43 g H₂
1 mole
An iron bar at 200°c is placed in thermal contact with an identical iron bar at 120°c in an isolated system. after 30 minutes, both iron bars are at 160°c. if the iron bars were placed in thermal contact in an open system instead of an isolated system, how would the results be different? assume that the room temperature is 25°c.
When exothermic reactions occur, ______________.
i. heat energy is absorbed.
ii. water is produced.
iii. heat energy is released.
iv. oxygen is produced.
Answer:
heat energy is released into the surrounding
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Answer:
What is your question?
Explanation:
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Answer:
Stan TXT
Explanation:
because they are amazing
Why do we need to clamp the rubber tube when we are transferring the flask from the boiling water to the cool water
The flask assembly will heat up in hot water, pressure will build up inside the flask and it could explode.
The fingertip is kept in place throughout the transfer to prevent the seepage of the trapped air from the flask. Inside the tank, the flask is constantly upside down. The flask can be tipped at an angle to allow the air to escape.The entire contents of the pint will erupt out if only the bottom of the container is heated.Rubber stoppers are ideal for plugging joints or holes in laboratory glassware and creating a liquid-tight seal.What is the proper method for inserting glass tubing into a rubber stopper?
Lubricate the end of the glass tubing with a few drops of water, washing-up liquid, glycerol, or vegetable oil.Hold the glass tubing close to where it enters the hole in the rubber stopper.Ease the tubing into the hole with a gentle twisting motion.Learn more about rubber stopper
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chemical change grade 10 mind map
Chemical change: A chemical reaction is the change of one chemical substance into another chemical substance. For instance: The rusting of iron, the curdling of milk, the digestion of food, breathing, etc.
What is a chemical reaction?
A chemical reaction results in a chemical change because a new material has entirely different properties from the original substance. In a chemical reaction, atoms rearrange themselves.Reactants are the chemicals that participate in a chemical reaction.Products are the new compounds created as a result of a chemical process. An illustration of a chemical reaction is burning magnesium in the air to produce magnesium oxide.2Mg(s) + O2(g) △→ 2MgO(s)The magnesium ribbon is cleaned with sandpaper before being burned in the air. This cleans the magnesium ribbon's surface of the basic magnesium carbonate protecting coating.Reactant: Materials that participate in a chemical reaction are referred to as reactants. Mg and O2, as an example.A product is a newly created substance that results from a chemical reaction. Example: MgO.A chemical reaction is the change of one chemical substance into another chemical substance.
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Chemical change is the change chemical substance is transformed into another chemical substance.It is irreversible in nature , for example Reaction of medicine in body , milk to curd etc.
What is the difference between chemical and Physical change?1)Physical change temporary or reversible in nature but chemical change is irreversible in nature
2)In physical change there no new product is formed but in chemical change there formation of new product takes .
3) Physical change is change sin shape ,size or state for example freezing of water , melting of wax , and example of Chemical change are Burning of coal, digestion of food
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93.4 g of a metal is heated to 85.0 C in a hot water bath, then dropped into a calorimeter containing 342 ml of water
The specific heat capacity of the metal is determined as 0.76 J/g⁰C.
Mass of the watermass = density x volume
mass = 342 ml x 1 g/ml = 342 g
Specific heat capacity of the metalApply the law of conservation of energy;
Heat lost by the metal = Heat gained by the calorimeter + heat gained by water
(93.4)(85 - 29.3)c = (8.29)(29.3) + (342)(4.186)(29.3 - 26.7)
5,202.38c = 3,965.088
c = 3,965.088/5,202.38
c = 0.76 J/g⁰C
Thus, the specific heat capacity of the metal is determined as 0.76 J/g⁰C.
The complete question is below;
93.4 g of a metal is heated to 85.0 C in a hot water bath, then dropped into a calorimeter containing 342 ml of water (d 1.00 g/mL) at 26.7 . The equilibrium temperature was found to be 29.3 C. Calculate the specific heat of the metal with proper units. (C.cal 8.29 J/c)
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an iron weighing 50 grams absorbs 256.0 J of heat and warms by 11.4C What is the specific heat of the iron can
The specific heat of the iron can is determined as 0.449 J/g⁰C.
Specific heat of the iron can
The specific heat of the iron can is calculated as follows;
Q = mcΔθ
c = Q/mΔθ
where;
Q is quantity of heatΔθ is change in temperaturem is massc = 256/(50 x 11.4)
c = 0.449 J/g⁰C
Thus, the specific heat of the iron can is determined as 0.449 J/g⁰C.
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H. If you had 64 amu of ch4, how many molecules would this be? i. If you had 64 g of ch4, how many moles would this be?
The number of molecules and number of moles of [tex]CH_{4}[/tex] is 4 moles and 24.088×[tex]10^{23}[/tex] molecules.
Calculation,
Atomic mass of carbon is 12 u and H is 1 u
So, molar mass of [tex]CH_{4}[/tex] = 12 + 1×4 = 16 u = 16 g/mole
Number of moles = given mass / molar mass = 64 g/ 16 g/mol = 4 moles
1 moles of substance contains 6 .022 ×[tex]10^{23}[/tex] molecules.
So, number of molecules in 3 moles of methane = 4×6.022 ×[tex]10^{23}[/tex]
number of molecules in 3 moles of methane = 24.088×[tex]10^{23}[/tex] molecules.
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You have a 150mL sample of an aqueous solution at 25C. It contains 15.2mg of an unknown nonelectrolyte compound. If the solution has an osmotic pressure of 8.44 torr, what is the molar mass of the compound
The molar mass of the compound:
If the solution has an osmotic pressure of 8.44 torr, then the molar mass of the unknown non-electrolyte is 223.14 g.
What is osmosis?
Osmosis is defined as the flow of solvent molecules through semi-permeable membrane.Osmotic pressure is the pressure applied to stop the flow of solvent molecules.It is a colligative property that means osmotic pressure depends on the number of solute particles .Therefore,
π[tex]V=inRT[/tex] ( for electrolytes)
Where, π= Osmotic pressure
i = Van 't Hoff factor
n= moles
R= Gaseous constant = 62.363577 L torr [tex]mol^{-1}K^{-1}[/tex]
T= Temperature
V= Volume of solution
Given:
T= 298K
V= 150 mL= 0.150 L
Given mass of unknown electrolyte= 15.2 mg = 15.2 x [tex]10^{-3}[/tex] g
Osmotic pressure= 8.44 torr
Molar mass= ?
For non-electrolytes:
πV = n RT
πV=[tex]\frac{m}{M}[/tex]RT
Calculations:
Putting the given values in the formula:
8.44 x 0.150 =15.2 x [tex]10^{-3}[/tex]/ M x 62.36 x 298
1.266 = 282.5/M
M = 282.5/1.266
M = 223.14 g
Therefore,
The molar mass of the unknown non-electrolyte is 223.14g.
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Suppose you prepare 500 ml of a 0.10 Msolution of some salt and then spill some of it. What happens to the concentration of the solution left in the container
The concentration of the solution left in the container will remain same.
What is concentration?The quantity of a chemical in a mixture is expressed by the substance's concentration. Concentration can be expressed in numerous ways. Chemists refer to the substance as a solute, and the substance that contains the solvent dissolves the solute is referred to as a solution.
Importance of concentration -
Because it controls how frequently particles collide in solution and, in turn, indirectly determines the speeds of reaction and the circumstances at equilibrium, the concentration of a solvent is crucial for understanding chemical reactions.The amount of a solute present in a specific quantity of a solvent or solution is known as the concentration of the solution. In chemistry. Determining the stoichiometry of reagents for solution reactions requires knowledge of the solute concentration.The calculation of concentration is done by various methods; some are given below,
Molarity (M) - moles of solute/liters of solution.Mass Concentration (kg/m³ or g/L) - mass of solute/volume of solutionNormality (N) - grams active solute/liters of solutionMolality (m) - moles of solute/mass of solvent (not mass of solution!)Mass Percent (%) - mass solute/mass solution x 100% (mass unit is same for both solute and solution)Volume Concentration (no unit) - volume of solute/volume of mixture (same units of volume for each)To know more about concentration of a solution, here
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What is the name of the molecule below?
G
O A. Ethyne
O B. Ethene
C. Methene
OD. Methyne
H-C=C-H
The name of the molecule above is Ethene
What are organic compounds?Organic compounds can be defined as compounds containing carbon and hydrogen.
Some classes of organic compounds are:
AlkanesAlkenesAlkanolsAlkanalsAlkynesSo therefore, he name of the molecule above is Ethene
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What is the molality of a solution prepared by dissolving 2.00 ml of bromine (d = 3.105 g/ml) in 125 ml of acetic acid, hc2h3o2 (d = 1.05 g/ml) (ans. 0.30 m)?
The molality of a solution is 0.304g
Calculation,
Given data,
Volume of bromine = 2 mldensity of bromine = 3.105 g/ml Volume of acetic acid = 125 mldensity of of acetic acid = 1.05 g/mlDensity of bromine = 3.105 g/ml = mass / volume = mass / 2 ml
Mass of bromine = 3.105 g/ml × 2 ml = 6.206 g
Density of acetic acid = 1.05 g/ml = mass / volume = mass / 125 ml
Mass of bromine = 1.05 g/ml × 125 ml = 127.5 g
Molality = mass of solute in gram/molar mass of solute × 1000/mass of solvent in gram
Molality = 6.206 g/159.88 g/mol × 1000/127.5 g = 0.304 g
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In a closed container, nitrogen gas and hydrogen gas react to produce ammonia.
N2(g) + 3H₂(g)2NH3(g)
Which statement describes the graph of concentration versus time for ammonia as the system approaches dynamic equilibrium?
It curves down and levels out.
It curves up and levels out.
It steadily decreases to zero.
It steadily increases to a maximum.
[tex]\frac{1}{2} N_{2} (g)+\frac{3}{2} H_{2} (g)[/tex]⇌[tex]NH_{3} (g)[/tex]
It curves up and levels out.
What type of reaction are nitrogen and hydrogen form ammonia?Three hydrogen atoms and one nitrogen atom combine to form ammonia. It has a tetrahedral structure. Ammonia is a fertilizer and a cleaning agent and is used in the manufacturing of nitric acid. NH3 is typically found as a gas and is corrosive and dangerous when inhaled over time.Chemical equations express chemical reactions in the form of chemical formulas with an arrow pointing from reactant to product. A balanced chemical equation has the same amount of atoms of each element on both sides of the equation.Here, the balancing of a chemical equation is governed by the law of conservation of mass.The chemical reaction is Nitrogen gas and hydrogen gas mixed to generate ammonia.The statement describes the graph of concentration versus time for ammonia as the system approaches dynamic equilibrium: It curves up and levels out.
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As the system approches to dynamic equilibrium
It curves up and levels out.
What is Haber's Process?
Haber's process is used to produce Ammonia in industries.
In Haber's process , the Nitrogen reacts with Hydrogen and product formed is Ammonia.
N2+3H²→2NH3
The reactants which are used in this Process are :
1)Iron is used as catalyst
2) Air which supplies the nitrogen
3) Pressure is 200atm
4) Temperature used is 400-45°C .
Ammonia is used for :
*Agriculture uses as Fertilizer
* In Refrigeration
* Used in production of medicine
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How many molecules of zinc oxide are there in a 2 kg (2,000 g) sample?
Answer:
1.48 x 10²⁵ molecules ZnO
Explanation:
To find the amount of molecules, you need to (1) convert grams to moles (via molar mass) and then (2) convert moles to molecules (via Avogadro's Number). It is important to arrange the conversions/ratios in a way that allows for the cancellation of units.
Molar Mass (ZnO): 65.380 g/mol + 15.998 g/mol
Molar Mass (ZnO): 81.378 g/mol
Avogadro's Number:
6.022 x 10²³ molecules = 1 mole
2,000 g ZnO 1 mole 6.022 x 10²³ molecules
--------------------- x ----------------- x --------------------------------------- =
81.378 g 1 mole
= 1.48 x 10²⁵ molecules ZnO
In the redox reaction below, which is the reducing agent?
MnO2(s) + 4H+(aq) + 2Cl–(aq) Right arrow. Mn2+(aq) + 2H2O(l) + Cl2(g)
CI–
CI2
Mn2+
MnO2
In the following redox reaction, the reducing agent is MnO2 (option D). Details about reducing agent can be found below.
What is a reducing agent?A reducing agent in a redox reaction is any substance that reduces, or donates electrons to another, hence, it becomes oxidized.
According to this question, a redox reaction is given as follows: MnO2(s) + 4H+(aq) + 2Cl–(aq) = Mn2+(aq) + 2H2O(l) + Cl2(g)
As shown in the equation, MnO2 is oxidized into Mn2+, therefore, it is the reducing agent.
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15. What is the mass of mercury in a 250 g fish if the ppm was measured to be 0.23?
Answer: The mass of mercury will be 57.5 micrograms.
The given question deals with Analytical Chemistry where Concentration is asked here.
Concentration: Generally concentration is defined as amount of the substance per unit volume. Concentration is also expressed in parts per million(ppm) when it is a small quantity as in case of mercury content in fish.
Explanation: Given mass of the fish = 250 g,
ppm = 0.23
Now mass of mercury = 0.23 ppm × 250 g
= 0.23/1,000,000 × 250g
=0.23×250/1,000,000 g
= 0.0000575 g
=57.5 micrograms
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Compare how fast the rate of CO2 increase is in the last few hundred years with the rate of increase (or decrease, for that matter) in the preceding 400,000 years. What are the primary factors driving this change (that weren't present before
The rate of CO2 increase is in the last few hundred years is 10 times more with the rate of increase (or decrease, for that matter) in the preceding 400,000 years.
There are many possible reasons for this cause , some primary factors are listed below:
Increase in populationincreased emission of green house gases, as we all know auto mobile industry is growing rapidly and this vehicles releases harmful gases like CO2, CO ,etc. and increases carbon % , this CO2 is a main gas component in green house effect.Deforestation, as the amount of plant decreases the CO2 present in atmosphere increases, plants uses CO2 and sun lite to make their food via photosynthesis.Increased emission of Industrial flue gases, etc.Learn more about green house effect here...
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Which of the following are exact
numbers? Select all that apply.
Answer:
I believe it would be 30, 100, and 1. You count them, and they're significant figures. The decimals are an estimate and cannot be measure exactly. That is what I've learned, not sure what you're learning but hopefully it helps...
Explanation:
Basic explanation is when you count, that's an exact count. You're not estimating. That's real. But for measuring something, you wouldn't have a precise answer because it could go on forever (like Pi)... this is just what i'm assuming.
In 1869, mendeleev created a periodic table in which elements were ordered by weight and placed in groups based on their chemical properties. mendeleev's decision to design the periodic table in this way allowed immediate advances in chemistry by.?
a.) providing an explanation for the reactive properties of the alkali metals
b.) providing a framework for models of electron configurations
c.) predicting the existence of a group of undiscovered inert gases
d.) predicting the properties of undiscovered elements in specific atomic weight ranges.
please explain
Answer:
D
Explanation:
Mendeleev periodic table predicted the properties of undiscovered element like the eka-aluminium.
Which is the site of gaseous exchange in the lungs?
Write the relationship between displacement, velocity and time?
Explanation:
1. The gaseous exchange in the lungs occurs in the alveoli. They are tiny air sacs at the end of the bronchioles (tiny branches of air tubes in the lungs). The alveoli are where the lungs and the blood exchange oxygen and carbon dioxide during the process of breathing in and breathing out.
If you remove two protons and two neutrons from a gold atom (au), what new element is formed (if any)?
Answer: Iridium
Explanation:
The atomic number of Iridium is 77.
The element we obtain if we remove two protons and two neutrons from the gold is iridium. The atomic number of gold is 79 and that of iridium is 77.
What is iridium?Iridium is the 77th element in the periodic table. It is a transition metal like gold, silver, platinum etc. Iridium is a d-block metal and have its valence electrons in d-orbital.
Gold is 79th element and it is also a transition metal. Gold is a precious metal used in making ornaments and its having high cost.
The atomic number of gold is 79 and it have 79 electrons and 79 protons. The atomic number of an element is the number of its protons and the mass number of the element is the sum of number of electrons and number of protons.
If we remove two protons from the 79 protons of gold the proton number becomes 77 and thus the atomic number. The elements with the atomic number 77 is iridium.
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Which one of the following has little bearing on whether profitable opportunity exists to install additional new or refurbished production equipment in the upcoming decision round
The option that has little bearing on whether profitable opportunity exists is option c) How many companies in the industry have expanded their plant capacity since Year 10 because it is not detailed enough.
What is Decision Making:Decision making is known to be a term that connote the method or act that is based on making the right and best decision among the numbers of alternative available.
Note that It includes the act of classifying and knowing the best on the use of preference, belief, and others.
Therefore, the option that has little bearing on whether profitable opportunity exists is option c) How many companies in the industry have expanded their plant capacity since Year 10 because it is not detailed enough.
See full question below
Which one of the following has little bearing on whether profitable opportunity exists to build additional plant capacity in the upcoming decision round?
a) Whether data in the most recent FIR indicates that unsold inventories of branded footwear were so disturbingly high that many of these unsold pairs were cleared from company inventories at money-losing prices.
b) Whether the most recent year's FIR shows that ample production capacity already exists to supply the combined demand for branded footwear and private-label footwear three years from now.
c) How many companies in the industry have expanded their plant capacity since Year 10.
d) How potential global supply of footwear in the upcoming year compares with expected global demand
e) Whether the branded pairs available for sale in the most recent year (as reported in FIR)
exceeded global branded demand and, if so, by how much.
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