1. The number of mole of aluminum in each can is 2 moles
2. The number of molecules of aluminum that Darlene gave to the recycling guy altogether is 4.816×10²⁶ molecules
Description of moleThe mole of a substance is related to it's mass and molar mass according to the following equation:
Mole = mass / molar mass
1. How to determine the mole in each can of aluminumMass of one Al can = 53.96 gMolar mass of Al = 27 g/mol Mole of one Al can =?Mole = mass / molar mass
Mole of one Al can = 53.96 / 27
Mole of one Al can = 2 moles
2. How to determine the number of moleculeNumber of Al cans = 400Mole of one Al can = 2 molesTotal mole = 2 × 400 = 800 molesNumber of molecules =?From Avogadro's hypothesis,
1 mole of Al = 6.02×10²³ molecules
Therefore,
800 moles of Al = 800 × 6.02×10²³
800 moles of Al = 4.816×10²⁶ molecules
Thus, Darlene gave to the recycling guy a total of 4.816×10²⁶ molecules
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Please help me with this sheet on distillation, the circles require an explanation on what is happening. I have colour coded them to make it easier for you ♡
Answer:
Green: Heating & Evaporation
It is the solution which is to be distilled (separate water from the salt). Heat is applied at the flask and the solution boils hence producing vapour.
Yellow: Temperature measurements
At this point, the temperature of the vapor is measured by the thermometer. Here, discrimination occurs, when temperature is 100°C (Bpt. of water), then the temperature is made constant.
Pink: Ejection of warm water
This is the outlet on the lie big condensor of water which absorbs the temperature of the vapor. This water is released when vapor is undergoing condensation (turning into liquid)
Green: Insertion of cold water
Cold water is passed through the condensor so as to cool down the vapor into liquid
Red: Condensation
Along the tube, vapor is being cooled down and condensed into a liquid characteristic.
Purple: Water jacket (condenser)
This is the condenser tube through which cold water passes to cool down the vapor.
Blue: Distillate
The condensed vapor (water) is collected in a conical flask
Explanation:
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The elements of a brand that cannot be spoken are called the ______. brand mark trademark brand name brand equity
The elements of a brand that cannot be spoken are called option(a)i.e, brand mark.
A brand mark is a logo, design element, artistic creation, or other visual representation that facilitates the quick identification of a particular company. Building and maintaining a brand's reputation is essential.
The brand mark is significant because it draws attention, makes an impact, establishes your brand identity, is memorable, sets you apart from rivals, fosters brand loyalty, and is well-liked by your target market.
However, when examining examples of brand markings, Pepsi is without a doubt the superior firm to take into account. Coca-Cola still employs its name as part of its design, in contrast to Pepsi, which may get by with nothing more than its recognizable white, blue, and red globe to draw customers' attention.
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Are those that can be replenished naturally. sunlight, which can be used for solar energy, is an example. question 26 options: nonrenewable resources renewable resources natural resources manufactured resources
Sunlight, which can be used for solar energy, is an example for renewable resources.
Renewable resources can be replenished and they are nondepletable. Some examples are solar energy,wind power, hydropower, geothermal, and biofuels.
Solar radiation is the source of electric energy. Solar energy is harnessed using a solar power to generate electricity.
It can be active solar or passive solar. It depends on how they capture and distribute solar energy or convert it into solar power
Biofuel is renewable energy source, but not green energy source.
Natural gas is not renewable recourse, because every year is less and less natural gas.
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A scientist collected 6.29 g ch4 gas (methane) through fracking how many moles of methane were collected?
Moles = mass/molar mass
mass= 6.29 g.
molar mass = 16.04 g .
Moles of methane collected are = 6.29/16.04
= 0.39.
0.39 moles of methane gas was collected.
What is methane gas?Hydrocarbon methane (CH4) is a main constituent of natural gas. Because methane is a greenhouse gas (GHG), its presence in the atmosphere has an impact on the planet's climate and temperature. There are many anthropogenic (influenced by humans) and natural sources that release methane.
High methane levels may reduce the amount of oxygen breathed from the air. This can cause symptoms like headaches, face flushing, slurred speech, visual problems, memory loss, mood swings, and altered eyesight. In dire circumstances, it's possible to have changes in breathing and heart rate, balance problems, numbness, and unconsciousness.
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Calculate the molarity and molality of an hf solution made up of 11.0 g hf in 105.0 g of water. the density of the solution is 0.94 g/ml.
Molality and molarity are same = 5.23M
(a)Molarity = moles of solute / volume of solution (in L)
Molarity = mass of solute / molecular weight of solute × volume of solution (in L)
Molarity = 11.0 / 20.01 × 0.105
5.23M = Molarity
(b) Molality = moles of solute / volume of solution (in kg)
Molality = mass of solute / molecular weight of solute × volume of solution (in kg)
Molality = 11.0 / 20.01 × 0.105
5.23M = Molality
Hence, both molality and molarity are same = 5.23M
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An organism was kept at a temperature of 40°C for a period of 2 weeks. At the end of that time, the investigator determined that the organism was sterile. To support the hypothesis that high temperatures cause sterility, the investigator should be able to show that the
1. organism was not sterile before the experiment period began.
2. high temperature did not alter the blood pressure of the organism
3. pituitary gland of the organism had not degenerated.
4. organism was homozygous for temperature sensitivity.
The investigator should show that the organism was not sterile before the experiment began. So the correct option is A.
What is a scientific hypothesis?
A scientific hypothesis is a theory that offers a speculative explanation for a phenomenon or a specific group of related events that have been observed in the natural world. The capacity to be supported or disproven by observation and experimentation are the two main characteristics of a scientific hypothesis, and they are embodied in an "If...then" statement that summarises the notion. In the middle of the 20th century, British philosopher Karl Popper, who was of Austrian descent, established the idea that a scientific theory might be both falsified and tested.
The scientific method, the strategy used by scientists to try to comprehend and evaluate theories regarding natural events, includes the formation and testing of hypotheses. The process of developing a hypothesis is commonly referred to as creative and is based on prior scientific understanding, intuition, or experience.
Therefore, the correct option is A.
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If urine has a density of 1.08 g/ml, what would be the mass of a 139 ml urine sample?
The urine sample with a density of 1.08 g/ml and a volume of 139 ml, has a mass of: 0.39 g
The density formula and the procedure we will use is:
ρ = m/v
Where:
v= volumeρ= densitym= massInformation about the problem:
ρ= 1.08 g/mlv= 139 mlm= ?Applying the density formula and clearing the mass (m), we get:
m = ρ * v
m = 1.08 g/ml * 139 ml
m = 150.12 g
What is density?It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.
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After extraction of the benzoic acid into the aqueous solution as its anionic salt, the ether solution was then washed with water two further times. What do you think was the purpose of these two wash steps?.
To remove any remaining unreacted inorganic component (from the added separating reagent) in the ether solution, two additional washes were performed after extracting benzoic acid into the aqueous solution as its anionic salt.
Benzoic acid must first be extracted from a mixture by adding NaOH, and then any excess NaOH must be removed in order to continue. Further, to get rid of the excess NaOH in the solution, it is washed with water twice or three times.
To reduce the amount of residue and other impurities in the layers, washing is done. The polar impurities, such as the leftover anionic salt of benzoic acid, tend to migrate to the water when washing, giving you a purer organic layer because ether is non-polar and water is polar.
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Sarah and evan are in the same science class. the teacher asks the class to design an experiment to determine the effect of acid rain on limestone. sarah designs an experiment which uses chalk and carbonic acid at a ph of 5.7, because she knows that chalk has the same chemical make-up as limestone and she knows that acid rain is primarily made up of carbonic acid at a ph around 5.7. evan designs an experiment which uses limestone tiles and acid rain collected from the environment. how do these experimental methods compare?
Sarah knows that chalk has the same chemical make-up as limestone and she knows that acid rain is primarily made up of carbonic acid at a ph around 5.7. So the correct option is (B) Sarah's materials are cheaper and easier to obtain, but Evan's materials will allow him to better mimic real life.
Limestone is a sedimentary rock mostly made of calcium carbonate (calcite) or calcium and magnesium double carbonates (dolomite). Small fossils, shell pieces, and other fossilised debris are frequently found in its composition.
Calcium oxide, which is derived from limestone, is used in the manufacture of steel, mining, paper, water treatment and purification, and plastics. Lime is extensively used in agriculture and the production of glass.
The biggest myth about limestone is that it's a delicate stone. Actually, limestone can be anything from extremely hard to soft. It should be selected keeping in mind the final design while paying close attention to its intended usage.
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The complete question is ''Sarah and Evan are in the same science class. The teacher asks the class to design an experiment to determine the effect of acid rain on limestone. Sarah designs an experiment which uses chalk and carbonic acid at a pH of 5.7, because she knows that chalk has the same chemical make-up as limestone and she knows that acid rain is primarily made up of carbonic acid at a pH around 5.7. Evan designs an experiment which uses limestone tiles and acid rain collected from the environment. How do these experimental methods compare?
A. Sarah's experimental results will be easier to predict. Evan's results will be impossible to predict since he uses real acid rain.
B. Sarah's materials are cheaper and easier to obtain, but Evan's materials will allow him to better mimic real life.
C. Evan's experimental design will prevent him from being able to form a logical conclusion, whereas a conclusion can be made with Sarah's design.
D. Evan's experiment can be preformed at any time, but Sarah's experiment can only be performed when there is a rainstorm.
In the laboratory, a student dilutes 29.0 ml of a 7.71 m hydroiodic acid solution to a total volume of 200.0 ml. what is the concentration of the diluted solution?
The concentration of the diluted solution is 1.11M , using formula M1V1=M2V2 (whereM = molarity , V = volume).
The formula M1V1=M2V2 is the most widely used.
You must ensure that M stands for Molarity and V for Volume in Liters in this formula. You must divide 29.0 mL by 1,000 in order to convert this problem's mL to L units (mL =.0290 L).
M1 is the specified molarity (7.71M), and V1 is the specified molarity's volume (.0290 L).
The final molarity M2 is what we are looking for, and the final volume V2 equals 1000 L. (remember to convert the 200.0 mL to L)
Fill in the formula with your numbers.
(X) × (0.2000 L) = (7.71M) × (0.0290 L)
(7.71M) × (0.0290 L) / (0.2000 L) = (X)
1.11M = X
Given that we maintained the same number of moles in the solution, this makes sense.
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According to the law of conservation of mass, which statement is true?
Answer:
It's the last option,
Explanation:
In a chemical reaction, the mass of the reactants must equal the total mass of the products, assuming that the reaction has gone to completion.
Meaning that option D is correct (last one)
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Answer: anwser D
Explanation: HOPE THIS HELPS!!!
Biodiversity is important for the sustainability of ecosystems. However, many of the human actions that are aimed at growing communities are decreasing the biodiversity of these areas, leaving populations and ecosystems vulnerable. As human populations grow, the terrestrial and aquatic ecosystems they use may be transformed by the efforts of human beings and biodiversity losses typically accompany these processes. Which of these actions decrease biodiversity and threaten sustainability? Select ALL that apply.
A Invasive (non-native) species may outcompete native species for food and habitat. Invasive (non-native) species may outcompete native species for food and habitat.
B Regulated hunting seasons artificially decrease hunted populations, often leading to extinctions. Regulated hunting seasons artificially decrease hunted populations, often leading to extinctions.
C Pollution from building and commercialization can create health problems in exposed organisms. Pollution from building and commercialization can create health problems in exposed organisms.
D Decreased use of pesticides and fertilizers can allow for increased damage to plant life. Decreased use of pesticides and fertilizers can allow for increased damage to plant life.
E Habitat destruction reduces or eliminates the food resources and living space for most species. Habitat destruction reduces or eliminates the food resources and living space for most species.
The actions by humans that decrease biodiversity and threaten sustainability are;
Regulated hunting seasons artificially decrease hunted populations, often leading to extinctions.Pollution from building and commercialization can create health problems in exposed organisms.Habitat destruction reduces or eliminates the food resources and living space for most species.What is biodiversity?The term biodiversity has to do with the existence of different species that exist in an ecosystem. In a given ecosystem, there could be several species that exist together. This biodiversity is very much important for the continuity of balance in nature.
The actions by humans that decrease biodiversity and threaten sustainability are;
Regulated hunting seasons artificially decrease hunted populations, often leading to extinctions.Pollution from building and commercialization can create health problems in exposed organisms.Habitat destruction reduces or eliminates the food resources and living space for most species.Learn more about biodiversity:https://brainly.com/question/13073382
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Calculate the molalities of the following aqueous solutions: (a) 1.036 m sugar (c12h22o11) solution (density of solution = 1.095 g/ml)
the molalities of the following aqueous solutions: (a) 1.036 m sugar (c12h22o11) solution (density of solution = 1.095 g/ml)
Molality = 1.096/(3.029 * 10 ^ -3) = 361.8 m
What is molality?
Molality is the ratio of moles of solute to kilogrammes of solvent (m). The following is the molality formula:
Molality (m) = kilogrammes of solvent / moles of solute.
Molality is the ratio of moles of solute to kilogrammes of solvent (m). Students should keep in mind that the moles are measured in proportion to the mass of the solvent and not the mass of the solution while using the molality formula, which is presented as follows.
Density = m/ volume = 1.095g/ml
Thus, weight of solvent = 1.095g for 1 ml
Moles of solvent = 1.036/342 moles = 3.029 * 10 ^ -3
Molality = 1.096/(3.029 * 10 ^ -3) = 361.8 m
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When two amino acid monomers are positioned so that the carboxyl group of one is adjacent to the amino group of the other, they can be joined through a reaction. True or false?.
The statement is true.
When two amino acid monomers are positioned so that the carboxyl group of one is adjacent to the amino group of the other, they can be joined through a dehydration reaction.
What are amino acids?
The building blocks of protein in your body are called amino acids. In other words, you can't actually develop new muscle without your amino acids when it comes to protein synthesis. Your body can produce amino acids on its own as a byproduct of regular activity, which are known as your nonessential amino acids.
A dehydration reaction can unite two amino acid monomers when they are arranged so that the carboxyl group of one is next to the amino group of the other.
Thus, the made assertion is true.
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What is the purpose of the sodium sulfate? Why did you rinse the sodium sulfate with an additional portion of methylene chloride?
sodium sulfate binds to water and forms a precipitate to ensure a pure solution of methylene chloride.
When you want to ensure a pure solution of methylene chloride, one way to do it is to add sodium sulfate to bind with the water. This forms a precipitate, which can then be removed from the solution. This leaves you with a purer solution of methylene chloride that can be used for your needs.
Sodium sulfate is a common precipitant in the purification of methylene chloride. When added to water, it forms a precipitate that ensures a pure solution of methylene chloride. This process is known as binding, and it is an essential step in ensuring the quality of the final product.
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Which bonds rely on the attraction of positive and negative charges? select all that apply.
Ionic bonds and hydrogen bonds rely on the attraction of positive and negative charges.
Which bonds rely on positive and negative charge attraction?As a result, a positively charged iron and a negatively charged ion are formed. The bond formed by these two ions is known as an ionic bond. A pair of atoms joined by a polar covalent bond: one atom has a slight positive charge and the other has a slight negative charge. Electronegativity refers to an atom's ability to attract electrons. The bond formed by the H of one water molecule and the O of another. A hydrogen bond is the bond between the H of one water molecule and the O of another water molecule.A covalent bond formed between two atoms with unequal electronegativities results in unequal electron sharing. Unequal electron sharing results in partially positive and partially negative charges at the bond's opposite ends.To learn more about Ionic bonds and hydrogen bonds refer to
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A solution is 0.0460 m lif. what is the molarity of the solution if the density is 1.10 g/ml?
a. 0.0418 m
b. 0.0417 m
c. 0.0506 m
d. 0.0441 m
e. 0.0460 m
The molarity of the solution is c. 0.0506 m.
b(LiF) = 0.0460 m; molality of the solution
Molality is concentration expressed in moles per kilogram.
d(LiF) = 1.1 g/ml; the density of the solution
M(LiF) = 26 g/moll; molar mass of the solute
The solute is the component present in small quantities in solution.
The relation between molarity and molality is c = 1000d / (1000/b + M)
c = 1000×1.1 / (1000/0.046 + 26)
c = 0.0506 M; the molarity of the solution
Molarity is defined as the number of moles of the solute per liter of the solution. It is denoted by M.
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Why do halogens not form positive atoms?
Answer:
Due to the fact that halogens have an outer shell made up of seven valence electrons, they frequently obtain an additional electron and a negative charge.
You have found two rocks one has a mass of 10 g the other 20 g both rocks have the same volume which rock has the greatest density
By comparing the density of the two rocks, Rock B has the greater density.
What is the density of the the two rocks?The density of a substance is a measure of the compactness of the particles of that substance.
The density of a substance is defined as the ratio of the mass amd the volume of that substance
Density = mass/ volumeThe densities of the two rocks are determined as follows:
mass of rock A = 10 g
mass of rock B = 20 g
volume of the two rock = v
Density of Rock A = 10/v
Density of Rock B = 20/v
Ratio of density of Rock A and B = 1/2
Therefore, Rock B has the greater density.
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Analyze the structure of 4‑sec‑butyl-5-ethyl-3-methyloctane. Identify the number of ethyl and methyl groups in the compound. Note that these groups are not necessarily confined to those specifically mentioned in the name.
The structure of 4‑sec‑butyl-5-ethyl-3-methyl octane has 4 ethyl groups and 2 methyl groups.
Since ethyl and methyl groups are saturated, there are no double or triple bonds between the atoms in these compounds. The main distinction between ethyl and methyl is that the former is made up of two carbon atoms while the latter is made up of just one. It is customary to write the chemicals' names in alphabetical order, so ethyl comes before methyl and then precedes propyl. The carbon atoms in a cycloalkane are linked together in a ring, hence the name. Just two types of alcohol are methanol and ethanol. Ethanol, also referred to as ethyl alcohol, has a chemical composition of two carbon atoms. Methanol also referred to as methyl alcohol, is made up of just one carbon atom.
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Which example shows an organism that cannot reach homeostasis through internal changes?
Responses
Circulation decreases in a bird when it becomes too warm.
A dog shivers when it is too cold.
A lizard is cold, and it moves to a sunny rock to warm up.
A person gets a fever in response to a flu infection.
As an example option C. A lizard is cold, and it moves to a sunny rock to warm up, hows an organism that cannot reach homeostasis through internal changes.
Homeostasis is the nation of steady internal, bodily, and chemical conditions maintained via dwelling systems. that is the circumstance of gold standard functioning for the organism and consists of many variables, which include body temperature and fluid balance, being kept inside certain pre-set limits.
Homeostasis is the ability to keep a quite stable internal kingdom that persists regardless of modifications within the world outside. All dwelling organisms, from flora to puppies to human beings, must alter their internal environment to procedure power and ultimately continue to exist.
Homeostasis is maintained by using a series of manipulation mechanisms performed at the organ, tissue, or cell degree. these management mechanisms include substrate supply, activation or inhibition of person enzymes and receptors, synthesis and degradation of enzymes, and compartmentalization.
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What change must made to the coefficients to balance this equation?
Answer:
C - switch the 3 and the 4
The way I did it is by rewriting the equation again but without the numbers and just balancing it myself
What is the net charge of the following amino acids at ph 1.0, 4.0, 8.0, and 12.0? (2 point each)
(a) histidine
(b) leucine
(c) aspartic acid
(d) tyrosine
(e) asparagine
Net charge
(a) histidine 0, +2, 0, -1
(b) leucine 0,
(c) aspartic acid 0
(d) tyrosine 0
(e) asparagine 0
What is ph ?
The hydrogen ion concentration is measured using the pH scale. The pH values, which range from 0 to 14, are assigned to it. Therefore, we may say that the pH value is a number that represents how acidic or basic a solution is.
A solution with a pH below 7 is referred to as acidic, and one with a pH over 7 is referred to as basic, or alkaline.
Thus, histidine has a net charge of 0 at ph 1, of 2 at ph 4 of 0 again at ph 8 and finally of -1 at ph 12.
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Determine the formula unit and name for the compound formed when each pair of ions interacts. in the formula capitalization and subscripts are graded. spelling counts al3 and cn-
In each question we need to balance the charge to get formula
[tex]Al(CN)_{3}[/tex]) Aluminum Cyanide
[tex]CaSO_{4}[/tex] Calcium Sulfate
[tex]LINO_{3}[/tex] Lithium Nitrate
[tex]NH_{4} CL[/tex] Ammonium Chloride
Ionic interaction is the attractive force between ions with opposite charges. Also called an ionic bond, it is the force that holds ionic compounds together. Like charges repel and opposite charges attract.
Intermolecular interactions occur between molecules or atoms that are not connected by bonds. Molecular interactions include cohesion (like-like attraction), adhesion (like-like attraction), and repulsion between molecules.
Divide the molar mass of the compound by the molar mass of the molecular formula. The result will be an integer or very close to an integer. Multiply all subscripts of the molecular formula by the integers found in step 2. The result is the sum formula
Hence, the result will be the sum formula
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Chromium forms a body centered cubic unit cell. if the radius of a chromium atom is 125 pm, what is the density of chromium in g/cm3?
The density of chromium is 7.15 g/cm³.
There is three types of cubic cell:
1) simple cubic unit cell.
2) body-centered cubic unit cell.
3) face-centered cubic-unit cell.
In body-centered cubic unit cell there are two atoms in one cell.
m(Cr) = 52 amu; mass of chromium atom
r(Cr) = 125 pm; the radius of a chromium atom
V(Cr) = 4/3 × r³ × π
V(Cr) = 4/3 × (1.25×10⁻⁸cm)³ × 3.14
V(Cr) = 8.18×10⁻²⁴ cm³; the volume of chromium atom
d(Cr) = 52 / 8.18×10⁻²⁴ cm³ × 2 × 6.022×10²³
d(Cr) = 7.15 g/cm³; density of a chromium atom
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If I have an object with a density of 2.42 g/mL and a mass of 27 g, what is the volume, in mL ?
The amount of energy that must be absorbed or lost to raise or lower the temperature of 1gram of liquid water by 1°c.
The amount of energy that must be absorbed or lost to raise or lower the temperature of 1 gram of liquid water by 1°C is 1 calorie.
A calorie (cal), or a small calorie, is the amount of energy needed to heat one gram of water by one degree Celsius. It is used to express the amount of energy released in a phase change or chemical reaction.
One small calorie is approximately 4.2 joules.
A calorie is a unit of energy.
A calorie was originally part of the metric system (SI), but now it is replaced with the joule (J).
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What is the value of ka for the methylammonium ion, ch3nh3 ? kb(ch3nh2) = 4.4 x 10-4
a) 4 x 10-4
b) 4.8 x 10-6
c) 4 x 10-10
d) 2.3 x 10-11
The correct answer is 2.3×[tex]10^{-11}[/tex]
The auto-ionization constant of water is related to the dissociation constant of an acid or base with its conjugate:
KaKb =Kw=1×10⁻¹⁴
Constant of acid dissociation
Calculations of an acid dissociation constant are used to quantify an acid's potency.
When HA, a chemical species, dissociates into A- and H+ at equilibrium, the acid dissociation constant is utilized. The conjugate base of the acid is the anion.
When both the forward and backward reactions proceed at the same rate, the reaction is in equilibrium.
Acid strength is typically measured using the pKa, which is equal to the negative log of the Ka value. Stronger acids are those with smaller pka values and larger Ka values, respectively. Here is a calculation of acid dissociation.
Ka=1×10⁻¹⁴/4.4×10⁻⁴
=2.3×10⁻¹¹
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Does NaCI have a high melting point
Answer:
Yes, at 801 °C
Explanation:
What volume is occupied by 0.102 molmol of helium gas at a pressure of 0.95 atmatm and a temperature of 305 kk ?
The volume occupied by 0.102 mole of the helium gas is 2.69 L
Data obtained from the questionThe following data were obtained from the question:
Number of mole (n) = 0.102 moles Pressure (P) = 0.95 atm Temperature (T) = 305 KGas constant (R) = 0.0821 atm.L/Kmol Volume (V) =? How to determine the volumeThe volume of the gas can be obtained by using the ideal gas equation as illustrated below:
PV = nRT
Divide both sides by P
V = nRT / P
V = (0.102 × 0.0821 × 305) / 0.95
V = 2.69 L
Thus, the volume of the gas is 2.69 L
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