Molar mass is the ratio of the mass to that amount of the substance. The mass of the barium nitrate in the formula unit is 23.0 grams.
What is mass?The mass of a substance is the product of the molar mass of the compound and the number of moles of the compound.
Given,
Molar mass of barium nitrate = 261.35 g/mol
If, [tex]6.022 \times 10^{23}[/tex] have a mass of 261.35 g/mol then, [tex]5.30 \times 10^{22}[/tex] formula units will have a mass of,
[tex]\begin{aligned}& = \dfrac{261.35 \times 5.30 \times 10^{22}}{6.022\times 10^{23}}\\\\&= 23.0\;\rm gm\end{aligned}[/tex]
Therefore, option C. 23.0 gm is the mass of barium nitrate.
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Answer:
CExplanation:
23.0g
Suggest the pH of the solution made when potassium oxide dissolves in water.
It gets basic
ie ph>7 for basic solutions
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A proton donor is a chemical that
a) protongenic
b) protophilic
c) amphoteric
d) amphiprotic
Answer:
Amphiprotic
Explanation:
These chemicals are too independentThey can either donate or accept a lone pair of protons .So they can act as base and acidhow many elements are in c17h19no3
Answer:
Morphine contains total 40 atom(s); 19 Hydrogen atom(s), 17 Carbon atom(s), 1 Nitrogen atom(s) and 3 Oxygen atom(s).
Explanation:
Which statement describes the BEST example of animals avoiding competition?
A.
A bee pollinates a flower.
B.
Cheetahs and lions feed on the same prey.
C.
A bird finds a spot in a tree to put a nest.
D.
A family of deer leave a crowded area of forest.
Answer:
D
Explanation:
If the deer leave the forest then they are avoiding compotation
a total of 1.4 moles of sodium nitrate is dissolved in enough water to make 2.0 liters of an aqueous solution. the gram-formula mass of sodim notrate is 85 grams per mole. determine the molarity of the solution
Answer:
1.4 moles/ 2.0 L= 0.7 M
Explanation: Molarity= moles of solute/ Liters of solution
therefore just plug the numbers in and you'll find the molarity to equal. 0.7
what are the advantages and diadvantages of preparing a standard solution?
Answer:
advantages:
. The error due to weighing the solute can be minimised by using concentrated stock solution that requires large quantities of solute. 2. We can prepare working standards of different concentrations by diluting the stock solution which is more efficient since consistency is maintained
3. Some of the concentrated solutions are more stable and are less likely to support microbial growth than working standards used in the experiments.
60 points please help me i will appreciate it!
Answer:
[tex]\huge\boxed{\sf n = 7.36 \ mol}[/tex]
Explanation:
Given Data:
Volume = v = 42.19 L
Pressure = P = 428.792 kPa = 4.23 atm
Temperature = 27.871 °C + 273 = 300.871 K
R = the gas constant = 0.08206 L atm K⁻¹mol⁻¹
Required:
No. of moles = n = ?
Formula:
nRT = Pv
Solution:
Rearranging formula
[tex]\displaystyle n = \frac{Pv}{RT} \\\\n = \frac{(4.23)(42.19)}{(0.08206)(300.871)} \\\\n = \frac{181.467}{24.69} \\\\n = 7.36 \ mol\\\\\rule[225]{225}{2}[/tex]
Which of the following statements about minerals and ores is true?
Answer:
please give a photo I can't now to help u
Answer:
they have a crystalline structure is the correct answer <3
Explanation:
60 points! please help me! i will appreciate it
Answer:
[tex]\huge\boxed{\sf v = 0.017 \ L}[/tex]
Explanation:
Given Data:
Mass = m = 0.08 g
Molar mass of C₂H₂F₄ = (12×2) + (1×2) + (19×4)
= 24 + 2 + 76 = 102 g/mol
Pressure = P = 1.14 atm
Temperature = T = 19.1 °C + 273 = 292.1 K
Gas Constant = R = 0.08206 L atm K⁻¹ mol⁻¹
Required:
Volume = v = ?
Formula:
Pv = nRT
Solution:
Firstly, finding moles (n)
[tex]\displaystyle n = \frac{mass}{molar \ mass} \\\\n = \frac{0.08 }{102} \\\\n =0.0008 \ mol[/tex]
Now, Finding volume (v)
Rearranging formula
[tex]\displaystyle v = \frac{nRT}{P} \\\\v = \frac{(0.0008)(0.08206)(292.1)}{1.14} \\\\v = \frac{0.019}{1.14} \\\\v = 0.017 \ L\\\\\rule[225]{225}{2}[/tex]
the [-oh) in a sample of egg whites is 6.3 x 10-7 m. what is the [h3o+] in these
egg whites?
The hydrogen ion concentration [H3O+] in an egg white containing 6.3 × 10-⁷M of [OH-] is 1.5 × 10-⁸M.
How to calculate [H3O+]?The hydrogen ion concentration of a solution can be calculated as follows:
pOH = - log [OH-]
pOH = - log [6.3 × 10-⁷M]
pOH = - [-6.2]
pOH = 6.2
Since pOH + pH = 14
pH = 14 - 6.2
pH = 7.8
pH = - log [H3O+]
7.8 = - log [H3O+]
[H3O+] = 10-⁷:⁸
[H3O+] = 1.5 × 10-⁸M
Therefore, the hydrogen ion concentration [H3O+] in an egg white containing 6.3 × 10-⁷M of [OH-] is 1.5 × 10-⁸M.
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Two groups of students tested to compare their speed working math problems. Each group was given the same problems. One group used calculators and the other group computed without calculators.
Independent variable:
dependent variable:
controlled variable:
Answer:
The independent variable is the calculator
The dependent variable is the speed of solving the problem.
The constant variable is the same set of problems that were assigned to two groups of students.
The dependent variable is the one that is being tested by experimentation. The dependent variable depends on the independent variable.
The independent variable can b changed by the experimenter whereas the constant variable remains unchanged throughout the experiment.
Answer:
Controlled Variable: The same math problems
Dependent Variable: The amount of time taken to answer
Independent Variable: One group using calculators and the other group not using calculators.
Explanation:
The dependent variable is the variable being tested and the independent variable is what is being changed. The controlled is what is staying the same.
You’re sitting at a car race and the cars sound differently when they approach as opposed to when they are moving away. Why might this be true? Explain in detail.
Answer:
I have no clue this qestion is kinda stumping but it a really good question it got me thinking but i don't know if there is a right answer
Explanation:
I don't know
What is the role of meteorites in the formation of life?
Answer:
Meteorites are consensually considered to be involved in the origin of life on this Planet for several functions and at different levels: (i) as providers of impact energy during their passage through the atmosphere; (ii) as agents of geodynamics, intended both as starters of the Earth’s tectonics and as activators of local hydrothermal systems upon their fall; (iii) as sources of organic materials, at varying levels of limited complexity; and (iv) as catalysts.
Explanation:
what is the best "determiner" for identifying if it is a metal?
I need the answer please
Answer:
determiner is a word that introduces a noun or provides information about the quantity of a noun.
Explanation:
The metal cans are recyclable. (determiner before the adjective describing a plural noun to specify which cans)
Metal cans are recyclable. (no determiner because it's optional for plural nouns and noun phrases)
How many moles of oxygen are required to burn in one mole of C4H8 completely?
Answer:
6 moles of oxygen is required to burn 1 mole of C4H8 completely
Explanation:
reaction is C4H8 + (6)O2 ------ (4)CO2+ (4)H2O
i need help from the problem below
Answer:
I won't say I'm confident with this because I'm not sure if the second one is even correct, but I hope I helped you and didn't make things worse lol.
Do you think that parents should be able to design their babies using gene technology such as CRISPR?
Make sure you have 4 or 5 sentences for your answer.
Answer:
When Chinese researchers first edited the genes of a human embryo in a lab dish in 2015, it sparked global outcry and pleas from scientists not to make a baby using the technology, at least for the present.
When Chinese researchers first edited the genes of a human embryo in a lab dish in 2015, it sparked global outcry and pleas from scientists not to make a baby using the technology, at least for the present.It was the invention of a powerful gene-editing tool, CRISPR, which is cheap and easy to deploy, that made the birth of humans genetically modified in an in vitro fertilization (IVF) center a theoretical possibility
Explanation:
Now, it appears it may already be happening.
According to Chinese medical documents posted online this month (here and here), a team at the Southern University of Science and Technology, in Shenzhen, has been recruiting couples in an effort to create the first gene-edited babies. They planned to eliminate a gene called CCR5 in hopes of rendering the offspring resistant to HIV, smallpox, and cholera.
Distinguish between the law of conservation of mass and the law of constant proportion
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Ignition temperature is the lowest temperature at which a substance catches fire. Identify the correct option regarding the ignition temperature of a good fuel.
A. Ignition temperature below room temperature
B. Ignition temperature above room temperature
C. Ignition temperature equal to 100∘C
D. Ignition temperature equal to room temperature
B is your answer
If the ignition temperature of a fuel is lower than the room temperature, then it can catch fire very easily.
Therefore for an ideal fuel, the ignition temperature should be higher than the room temperature.
let's observe one by one
#1
If ignition temperature is below room temperature the fuel can catch fire at once.
No#2
Ignition temperature above room temperature is applicable as the fuel won't catch fire easily
True#3
It's boiling point of water not fuels
False#4
Equal to room temperature is same as first one can cause damage
NoWhat is the energy required to remove the electron from a hydrogen atom in the n = 11 state?
Based on the data given, the energy required to remove an electron from a hydrogen atom in the n = 11 state is -0.112 eV
What is ionization energy?Ionization energy is the energy requiredto remove an electron from a neutral atom or a cation in its gaseous state.
To calculate the energy required to remove the electron from a hydrogen atom in the n = 11 state, the formula below is used:
[tex]E_n = \frac{E_0 × Z^{2}}{n^{2}}[/tex]where
[tex]E_0 \: is \: ground \: state \: energy \: of \: hydrogen \: atom \: = -13.6 eV \\ [/tex]
Z = 1n = 11substituting the values:
[tex]E_n = \frac{ - 13.6 × 1^{2}}{11^{2}} \: = - 0.112 \: eV[/tex]
Therefore, the energy required to remove an electron from a hydrogen atom in the n = 11 state is -0.112 eV
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Carbon dioxide emissions have been linked to increased air pollution. The following table lists some possible public policies aimed at reducing the amount of carbon dioxide in the air
Some possible public policies aimed at reducing the amount of carbon dioxide in the air is that companies should make use of new emissions technology to avoid air pollution.
What is air pollution?What is air pollution?Air pollution is the release of substance that are dangerous or harmful to human health into the environment.
Excessive release of carbon dioxide into the atmosphere causes pollution and deplete our ozone layer.
One of the policy government have out in check is that all companies should purchase or make use of new emissions technology to avoid polluting the environment and causing harm to human health.
Therefore, some possible public policies aimed at reducing the amount of carbon dioxide in the air is that companies should make use of new emissions technology to avoid air pollution.
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Many policies are established to control air pollution like Tradable Permit System, Corrective Tax, Command-and-Control Policy, and Corrective Subsidy.
What are air pollution control policies?A corrective subsidy is a policy that encourages people to plant trees. Command-and-Control Policy or the regulation policy limits the emission of the particles that affect and harms the air and mandates the use of emissions-reducing technology.
Corrective Tax policy discourages negative effect behavior and imposes Pigovian tax that helps in achieving optimal pollutants. Tradable Permit System allows the figuring of the individual pollution emission.
Therefore, public policies are aimed to reduce air pollution through various means.
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How much hcl must be added to a liter of buffer that is 1. 5 m in acetic acid and 0. 70 m in sodium acetate to result in a buffer ph of 4. 01?]
For a liter of a buffer that is 1. 5 m in acetic acid and 0. 70 m in sodium acetate, and with a result in a buffer pH of 4.01, the moles of HCl required is mathematically given as x=0.313mol
What is the result in a buffer ph of 4. 01?Generally, the equation for the pH is mathematically given as
pH=pKa+logsalt/acid
Generally, the equation for the Chemical Reaction is mathematically given as
HCl+CH3CooNa---->NaCl+CH3OOH
Therefore
4.01=4.74+log\frac{0.8-x}{1.3+x}
-0.52=log\frac{0.8-x}{1.3+x}
x=0.313mol
In conclusion, The moles of HCl required is
x=0.313mol
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Buffer is a solution that prevents pH variation in a solution when base or acid is added. In a liter of buffer 0.313 mol of hydrochloric acid must be added.
What is pH?pH is the potential of hydrogen and is given as,
[tex]\rm pH =\rm pKa + log \dfrac{salt}{acid}[/tex]
The chemical reaction is given as,
[tex]\rm HCl+CH_{3}COONa \rightarrow NaCl+CH_{3}OOH[/tex]
Given,
pH =4.01
pKa = 4.74
Concentration of salt = 0.8 - x
Concentration of acid = 1.3 + x
Substituting values in the pH formula:
[tex]\begin{aligned} 4.01 &= 4.74 + \rm log \dfrac{(0.8 - x)}{ (1.3 + x)}\\\\-0.52 &= \rm log \dfrac{(0.8 - x)}{ (1.3 + x)}\\\\&= 0.313 \;\rm mol\end{aligned}[/tex]
Therefore, 0.313 moles of HCl are needed.
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Which plants have a fibrous root system? (Select all that apply.) grass dandelion carrot corn
The plants which have a fibrous root system are
GrassCornWhat is a fibrous root?A fibrous root system is a root system which consists of large mass of roots of nearly equal size
Some few examples of plants with fibrous roots system are as follows:
Rice plantsSugarcane plantsOnionsPinesAsparagusMaizeIn conclusion; the plants which have a fibrous root system are grasses and corns.
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_____is the rate of change of displacement
Answer:
Velocity
Explanation:
The rate of change of displacement is velocity.
Answer:
Velocity
Explanation:
The rate of change of displacement with time is called velocity.
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Determine the ka of the weak acid ha whose conjugate base has kb 2. 9 × 10−8
Answer: [tex]3.45*10^{-7}[/tex]
Explanation:
we can use the equation Ka * Kb = Kw
Kw is the equilibrium constant and always equals to [tex]1*10^{-14}[/tex]
we plug the given numbers into the equation, [tex]Ka * (2.9*10^{-8} )=(1*10^{-14} )[/tex]
now we just solve for Ka, [tex]Ka=\frac{1*10^{-14} }{2.9*10^{-8} }[/tex]
which gives us the value, [tex]Ka=3.45*10^{-7}[/tex]
hope this helped! ♡
The ka of the weak acid ha, whose conjugate base has kb 2. 9 × 10⁻⁸ is 3.45 × 10⁻⁷.
What is ka value?Ka value is the equilibrium constant found by the dissociation of acid.
By the equation
[tex]\rm ka \times kb = kw[/tex]
where kb = [tex]2.9 \times 10^-^8[/tex]
kw = [tex]1 \times 10^-^4[/tex]
Now, putting the values in the equation
[tex]1 \times 10^-^1^4 = ka \times 2.9 \times 10^-^8\\\\ka = \dfrac{1 \times 10^-^1^4}{2.9 \times 10^-^8} \\\\ka = 3.45 \times 10^-^7[/tex]
Thus, the ka of the weak acid ha, whose conjugate base has kb 2. 9 × 10⁻⁸ is 3.45 × 10⁻⁷.
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Which of the following compounds would be expected to have the strongest ionic bonds?
the compound that has the largest ions with the greatest charge
the compound that has the largest ions with the least charge
the compound that has the smallest ions with the greatest charge
the compound that has the smallest ions with the least charge
Answer:
the compound that has the smallest ions with the greatest charge
The compound that has the smallest ions with the greatest charge will have the strongest ionic bonds. Therefore, option C is correct.
What are ionic compounds?Ionic compounds can be defined as solids formed by closely packed ions of opposite charge. An Ionic compound is commonly formed when metal combines with non-metal.
In ionic compounds, the ions are held together by ionic bonds. The ions are created by accepting or losing electrons in order to get their nearest noble gas configuration. In a reaction, the metals have a tendency to lose electrons to complete their octet while non-metals will gain electrons to fill their octet.
An ionic bond or electrovalent bond is a type of linkage generated from the electrostatic attraction between oppositely charged ions. Such a bond produces when the valence electrons of one atom are transferred permanently to another.
The more the charge on the ions and the smaller the ions stronger the ionic bond will be formed.
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What units are appropriate to express specific heat?.
Answer:
joules per gram per degree (J/goC) or calories per gram per degree (cal/goC).
Explanation:
Answer:
Joules, Kelvin, or calories
Explanation:
The video uses visual representations to show the generation and travel of radio waves. What did you learn about radio waves from these representations?
Answer: I learned that almost every technology has radio waves that spread out from their sources.
Explanation:
Why are xrays used to probe the crystal structure of a material
Answer:
Because X-rays have wavelengths similar to the size of atoms
X rays are used to probe the crystal structure of a material because this have same wavelength as atoms of crystal have.
What are x rays?X rays are the type of electromagnetic radiations and it is produced when the fast moving electron collide with the target anode and sudden deceleration takes place.
X rays have the high energy so that it easily penetrate in any crystal molecule as they also have same wavelength as atoms of the crystals have.
Hence due to high energy and same wavelength was of atoms of crystal it is used to probe the crystal.
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are frosted flakes healthier than fruit loops?
No
Frosted flakes are rich in carbohydratesCarbohydrates are good for energy but they are life risky and can cause diabetes.Where as fruit loops are rich in several minerals and vitamins So fruit loops are healthier