How many moles of zinc, Zn, are in 1.31×1024 Zn atoms?

Answers

Answer 1

Answer:

=7.89013× 10^47 moles of zinc

Explanation:

1 atom contains 6.023×10^23 moles.

1.31×10^24 atoms of zinc contain6.023×10^24×1.31×10^.24


Related Questions

Identify the branch of chemistry being described.
a. _______________ study of the behavior and changes in matter including energy transfers, reaction mechanisms, and reaction rates.
b. _______________ study of compounds and chemicals containing carbon, which include pharmaceuticals, drugs, and plastics.
c. _______________ study of the components and composition of matter, including food nutrients, and quality control.
d. _______________ study of matter and processes that occur in biological organisms, including metabolism and fermentation.

Answers

Answer:

a. Physical Chemistry

b.Organic Chemistry

c.Food analysis, a very important branch of analytical chemistry

d. Biochemistry

Explanation:

Which of the following methods correctly describes the preparation of 1.00 L of an aqueous solution of 0.500 M NaOH?

Answers

Answer:

Place 20.0 g NaOH(s) in a flask and dilute to 1.00 L with water.

Explanation:

what is the new concentration of A if 7.7 ml of a .10 M solution of A is mixed with 18.3 mL of .20 M solution B and an additional 11.7 ml water?

Answers

Answer:

0.12 M

Explanation:

To find the new concentration, you need to (1) find the moles of Solution A (via the molarity equation), then (2) find the moles of Solution B, then (3) combine all of the moles and volumes, and then (4) calculate the new molarity. The final answer should have 2 sig figs to reflect the lowest amount of sig figs in the given values.

Solution A:

7.7 mL / 1,000 = 0.0077 L

Molarity = moles / volume

0.10 M = moles / 0.0077 L

0.00077 = moles

Solution B:

18.3 mL / 1,000 = 0.0183 L

Molarity = moles / volume

0.20 M = moles / 0.0183 L

0.00366 = moles

New Solution:

11.7 mL / 1,000 = 0.0117 L

New Volume = 0.0077 L + 0.0183 L + 0.0117 L

New Volume = 0.0377 L

New Moles = 0.00077 moles + 0.00366 moles

New Moles = 0.00443 moles

Molarity = moles / volume

Molarity = 0.0043 moles / 0.0377 L

Molarity = 0.1175 M = 0.12 M

number 3 pls and thank u

Answers

The statement which is not true is as follows:

The repulsive force between electrons on different atoms does not matter at all.

Thus, the correct option is C.

What is Equilibrium?

An equilibrium may be defined as the condition in which both the reactants and products are present in concentrations that have no additional propensity to alter with time so that there is no noticeable transformation in the possessions of the system.

The causation of repulsive force was thought to be made by the overlap of atomic orbitals and in between the electrons of diverse atoms, it matters a lot.

The equilibrium distance between nuclei of two covalently bonded atoms is called the bond length of that atom. It is the atomic separation at equilibrium.

Equilibrium occurs when the attractive and repulsive forces neglected the effect of each other in a specific state.

Therefore, it is well described above.

To learn more about Covalent bonds, refer to the link:

https://brainly.com/question/11651796

#SPJ1

Which buffer can be suitable to prepare a solution that needs to be buffered at pH 4? Explain your
choice.
A. Formic acid/Formiate buffer
B. Carbonic acid/Bicarbonate buffer
C. Ammonia/Ammonium buffer
D. Any buffer will work.
E. None of the buffers will be suitable.
34 Which of the following will form a buffer when mixed together? Explain

Answers

.

Which buffer can be suitable to prepare a solution that needs to be buffered at pH 4? Explain your

choice.

A. Formic acid/Formiate buffer

B. Carbonic acid/Bicarbonate buffer

C. Ammonia/Ammonium buffer

D. Any buffer will work.

E. None of the buffers will be suitable.

34 Which of the following will form a buffer when mixed together? Explain a weak acid/base and its conjugate base/acid in the form of salt

What type of reaction is represented by the following equation?

Mg(OH)2 (aq) + 2 HCl (aq) --> MgCl2 (aq) + 2 H2O (l)

Answers

Answer: Double replacement reaction

Explanation:

What can help engineers develop ways to prevent rusting?
OA. Understanding the solubility of metal ions
B. Understanding double-displacement reactions
C. Understanding oxidation-reduction reactions
D. Understanding the phase changes of metals

Answers

Answer: Understanding oxidation-reduction reactions

Explanation:

Rusting occurs when electrons are exchanged between iron and oxygen.

How many valence electrons does Rb (rubidium) have?

Answers

Answer:

The total number of electrons in a valence shell is called valence electrons. The electron configuration of rubidium shows that the last shell of rubidium has an electron. Therefore, the valence electrons of rubidium(Rb) are one.


What types of bonds and atoms are in the molecule shown below?
H₂C
C=C
H
CH₂-CH3
H
O A. Double bonds, triple bonds, carbon atoms, and hydrogen atoms
O B. Double bonds, triple bonds, carbon atoms, and helium atoms
OC. Single bonds, double bonds, carbon atoms, and hydrogen atoms
OD. Single bonds, double bonds, carbon atoms, and helium atoms

Answers

The types of bonds and atoms in the molecule shown below are C. Single bonds, double bonds, carbon atoms, and hydrogen atoms.

How many bonds can carbon form?

Carbon can only form a bond with a maximum of 4 other molecules.

We have been given a molecule

H₂C               CH₂-CH3

       C=C

H                H

In the given figure we can see that the molecule includes one double bond and other are single bonds.

Thus, The types of bonds and atoms in the molecule shown below are C. Single bonds, double bonds, carbon atoms, and hydrogen atoms.

Learn more about bonds;

https://brainly.com/question/17930825

#SPJ1

Identify if the following substances (a-h) are elements or compounds. ​

Answers

Answer:

Boron, Hydrogen, Helium, Lithium, Beryllium, Carbon, Nitrogen, Oxygen, etc.

Explanation:

These are all elements, not all of them.

1. For CCl4, upload a photo including the following: (1) work arriving at total # valence electrons
(2) hand drawn Lewis structure (3) molecular model (4) signature(s) and (5) date.

Answers

Work arriving at total valence electrons are 24

The valence electron is an electron in the outer shell associated with an atom, and that can participate in the formation of a chemical bond

For a main-group element, a valence electron can exist only in the outermost electron shell; for a transition metal, a valence electron can also be in an inner shell.

Lewis structures, also known as Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures (LEDS), are diagrams that show the bonding between atoms of a molecule, as well as the lone pairs of electrons that may exist in the molecule.

Calculating the work arrival at total valence electrons

We know 1 bond contains

2 valence electrons

Here CCl4 contains 4 bonds that is 8 valence electrons

Therefore ,

Total valence electrons are 32

Now valence electrons remain after bond formation =

32 - 8

=24 valence electrons

A molecular model is a physical model of an atomistic system that represents molecules and their processes

Molecular image and lewis hand drawn structure is as shown below

Learn more about lewis structure here

https://brainly.com/question/6224949

#SPJ10

why is it important to convert currency units from one type to another chemistry

Answers

easy to compare

easy in calculation

adjust to units commonly used in certain places

Hey there.
Explain JJ Thomson's model.​

Answers

Thomson discovered the electron, the first subatomic particle. In 1904, Thomson proposed atomic model where electrons are embedded within spherically distributed, positive charge (so-called "plum pudding" model).

♨ANSWER♥

J.J. Thomson's experiments with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons. Thomson proposed the plum pudding model of the atom, which had negatively-charged electrons embedded within a positively-charged "soup."

...hope this helps...

_♡_mashi_♡_

Look at the question marks between zinc (Zn) and arsenic (As) . At the time no elements were known with atomic weights between 65.2 and 75

Answers

Mendeleev positioned elements in the periodic table in increasing order of their atomic numbers, such that elements having identical chemical properties and characteristics plunge into the same group.

What is Mendeleev's periodic table?

Mendeleev's periodic table may be defined as a collection of elements in an increasing atomic mass hierarchy in a table arrangement, such that it reminisces resemblances and manias according to their chemical properties and characteristics.

Mendeleev found that two elements existed between atomic weights 65.2 and 75 because he comprehended especially pleasingly that the possessions of the elements were more comparable and closer to this degree.

He also anticipated having other elements that would have their possessions comparable to these other elements.

Therefore, he departed a void for these two elements in the periodic table until they were ultimately found in their real existence.

The complete question is as follows:

Look at the two question marks between zinc (Zn) and arsenic (As). At the time, no elements were known with atomic weights between 65.2 and 75. But Mendeleev predicted that two elements must exist with atomic weights in this range. What led Mendeleev to predict that two undiscovered elements existed in that range?

Therefore, it is well described above.

To learn more about Mendeleev's periodic table, refer to the link:

https://brainly.com/question/13991055

#SPJ1

When 50.0 g iron(III) oxide reacts with carbon monoxide, 32.5 g iron is produced. What is the percent yield of the reaction?
Fe2O3(s)+3CO(g)→2Fe(s)+3CO2(g)

Answers

Answer:

92.9%

Explanation:

You have been given the actual yield of the reaction. First, you need to find the theoretical yield of the reaction. To do this, you need to (1) convert grams Fe₂O₃ to moles Fe₂O₃ (via molar mass from periodic table values), then (2) convert moles Fe₂O₃ to moles Fe (via mole-to-mole ratio from reaction coefficients), and then (3) convert moles Fe to grams Fe (via molar mass).

Once you have found the theoretical yield, you need to use the percent yield equation to calculate the final answer. This number should have 3 sig figs to match the given values.

(Step 1)

Molar Mass (Fe₂O₃): 2(55.845 g/mol) + 3(15.998 g/mol)

Molar Mass (FeO₃): 159.684 g/mol

1 Fe₂O₃(s) + 3 CO(g) ---> 2 Fe(s) + 3 CO₂(g)


Molar Mass (Fe):
55.845 g/mol

50.0 g Fe₂O₃           1 mole              2 moles Fe           55.845 g
--------------------  x  ------------------  x  ---------------------  x  ----------------  = 35.0 g Fe
                               159.684 g         1 mole Fe₂O₃          1 mole

(Step 2)

                                 Actual Yield
Percent Yield  =  ---------------------------  x  100%
                             Theoretical Yield

                                32.5 g Fe
Percent Yield  =  ----------------------  x  100%  =  92.9%
                                35.0 g Fe

Which of the following is non polar covalent bond?

electronegativities:

C = 2.5, H = 2.1, P = 2.1, Cl = 3.0, N = 3.0, O = 3.5


N -O

N-Cl

P-O

H-Cl

Answers

Answer:

N-Cl

Explanation:

Look at the chart below. Since N-Cl bond has a electronegativity difference of (3.0-3.0) zero, they are non-polar.

0.160g of Mg is equal to how many moles Mg

Answers

The 0.160 grams of Mg is equal to 0.00658 moles of Magnesium (Mg).

Given,

Mass of Mg, m=0.160g

The atomic mass of Mg is 24.31 g.

The number of moles can be represented as the ratio of the given mass of the atom/molecule to the Atomic/Molar mass of the atom/molecule.

Atomic mass can be defined as the mass of the one mole of an atom and Similarily, molecular mass can be defined as the mass of one mole of a molecule.

Number of moles, n=Given mass/Molar mass

n=0.160g/(24.31g/mol)=0.00658 moles

Hence, the 0.160 grams of Magnesium (Mg) is equal to 0.00658 moles of Magnesium (Mg).

Learn more about Atomic mass here:

https://brainly.com/question/3187640

#SPJ10

Compared to infrared radiation, an electromagnetic wave that has a lower frequency will also have a ________.

longer wavelength and lower speed
longer wavelength and equal speed
shorter wavelength and lower speed
shorter wavelength and equal speed

Answers

Compared to infrared radiation, an electromagnetic wave that has a lower frequency will also have a longer wavelength and equal speed

What is Electromagnetic wave ?

Electromagnetic waves or EM waves are waves that are created as a result of vibrations between an electric field and a magnetic field.

It can be also defined as waves are composed of oscillating magnetic and electric fields.

One important feature fo electromagnetic radiation is that all have the same speed in vacuum, c, in vacuum, which is the speed of light.

Since, the speed, wavelength and frequency of the waves are related you can infere any of them when the other two are known.

The equation is:

speed = frequency × wavelength

   s     =          ν        ×      λ

   c     =          ν        ×      λ      . . . for the specific case of electromagnetic radiation

That inverse relation between frequency and wavelength, where the speed is the constant, shows that the lower the frequency the longer the wavelength.

Therefore,  the correct statment is that an an electromagnetic wave that has a lower frequency will also have a longer wavelength and equal speed (option B).

Learn more about Electromagnetic wave here ;

https://brainly.com/question/3101711

#SPJ1

Calculate the theoretical yield in , grams AlI₃, aluminum iodide, from the complete reaction of 113 grams I₂ according to the following balanced chemical equation: 2Al(s) + 3I₂(s) → 2AlI₃(s)

Answers

121 g [tex]AlI_{3}[/tex] aluminum iodide, from the complete reaction of 113 grams I₂ according to the following balanced chemical equation:

2Al(s) + 3I₂(s) → 2[tex]AlI_{3}[/tex]

As per the given balanced equation,

3 moles of [tex]I_{2}[/tex] are used to give 2 moles of [tex]AlI_{3}[/tex].

Atomic weight of iodine is 127 gm/ mole

So, molecular weight of iodine molecule = 254 gm/ mole

There for , we can say that 1 mole o iodine molecule contain 254 g

So ,Given 113 gm iodine contains how many moles?

  Moles of iodine = 113/254 = 0.44 moles

from the equation we can say that 3 moles of iodine used to give 2 moles of aluminum iodide.

So, 0.44 moles of iodine gives how many moles of aluminum iodide ?

   Moles of aluminum iodide = 0.44 × 2 ÷  3

                                             = 0.2965 moles

Molecular weight of one mole of aluminum iodide = atomic weight of Al + 3( atomic weight of iodine )

      = 408 gm

∴ 1 mole of aluminum iodide = 408 gm

so, 0.2965 moles of aluminum iodide = ?

            = 0.2964 × 408

            = 121 gm  Aluminum iodide formed.

Learn more about moles here...

https://brainly.com/question/1427235

#SPJ10

Three students are given a 200g object to weigh on a balance and record the following masses: 150g, 151g 150g. What can be said about the accuracy and precision of the balance?

Answers

The balance is precise but not accurate

explain hyaluronic acid




Answers

Answer:

Explanation:Hyaluronic acid is a natural substance found in the fluids in the eyes and joints. It acts as a cushion and lubricant in the joints and other tissues.

Different forms of hyaluronic acid are used for cosmetic purposes. Hyaluronic acid might also affect the way the body responds to injury and help to decrease swelling.

Hyaluronic acid injections are US FDA-approved for several conditions, including cataracts, osteoarthritis, and as an injectable gel filler (Juvedérm) for facial wrinkles. People also commonly take hyaluronic acid by mouth and apply it to the skin for UTIs, acid reflux, dry eyes, wound healing, aging skin, and many other conditions, but there is no good scientific evidence to support most of these other uses.

How does it work ?

Uses & Effectiveness ?

Likely Effective for

Cataracts. Injecting hyaluronic acid into the eye is effective when used during cataract surgery by an eye surgeon.

Swelling (inflammation) and sores inside the mouth (oral mucositis). Applying an FDA-approved hyaluronic acid gel is effective for treating mouth sores. It's not clear if other products help.

Answer:

Explanation:

Hyaluronic acid is a natural substance found in the fluids in the eyes and joints. It acts as a cushion and lubricant in the joints and other tissues. Different forms of hyaluronic acid are used for cosmetic purposes. Hyaluronic acid might also affect the way the body responds to injury and help to decrease swelling.


(❛◡❛✿)!

elemental phosphorus occurs as tetratomic molecules, p4. What mass in grams of chlorine gas is need to react completely with 455g of phosphorus to form phosphorus pentachloride?

Answers

P₄ + 10Cl₂ → 4PCl₅

mol P₄ = 455 : 123.895 g/mol = 3.672

mol Cl₂ = 10  x 3.672 = 36.72

mass Cl₂ = 36.72 x 71 g/mol = 2607.12 g

Which of the following is a covalent compound?

NF3
KBr
CuO
FeCI3

Answers

The 4 questions is a covalent compound

Chemistry: Please make sure to answer each question. Thank you in advance.


Create a diagram of your electroplating apparatus (an electrolytic cell). Then submit your drawing with the following terms labeled correctly. Or, beginning with the positive terminal of the battery and ending with the negative terminal of the battery, describe the path that the electricity takes and where each of the following occurs:

anode
cathode
copper strip
battery
positive terminal
negative terminal
place where oxidation occurs
place where reduction occurs
electrolyte solution
coin (or nail)
direction of electron flow

Answer:

(Score for Question 2: ___ of 7 points)

Describe the results of your procedure with the coin.

Answer:

(Score for Question 1: ___ of 6 points)

Write the two half-reactions that occur in this electroplating process. Be sure to include the states of the elements or ions.

Answer:

Answers

The electroplating process of the coin results in the coating of the coin with copper metal.

What is electroplating?

Electroplating is the process of using coating the surface of a metal with another one electrolytic cell.

The electroplating of the coin is done using copper as the anode and the coin as the cathode. The electrolyte is copper sulfate solution.

Oxidation occurs at the anode with the copper metal being converted to copper (ii) ions.

Reduction occurred at the cathode as the copper (ii) ions in the solution accept electrons to become copper metal and the coin being coated with copper.

The half-reactions are shown below:

At the anode:

[tex]Cu(s) \rightarrow Cu^{2+}(aq) + 2e^{-}[/tex]

At the cathode:

[tex]Cu^{2+}(aq) + 2e{-} \rightarrow Cu(s)[/tex]

Therefore, the electroplating process of the coin results in the coating of the coin with copper metal.

Learn more about electroplating at: https://brainly.com/question/3913850

#SPJ1

7. Name the representative particle (atom, molecule, ion or formula unit) of Radon

Answers

Answer: A representative particle can be an atom, and an ion. a molecule, or a formula unit.

Explanation:

A representative particle is the smallest unit in which a substance naturally exists. For the majority of elements, the representative particle is the atom. Iron, carbon, and helium consist of iron atoms, carbon atoms, and helium atom, respectively.

Radon is a naturally occurring radioactive gas that is odorless and tasteless.


Atoms-the smallest particle of an element

Ions-atoms with positive or negative charges.

Molecules- two or more covalently bonded atoms.

Formula units- the simplest ratio of ions that make up an ionic compound.

Select the correct answer from each drop-down menu. At chemical equilibrium, the amount of because .

Answers

A chemical equilibrium when the amounts of reactants or products no longer change.

Explanation:

Chemical equilibrium is a dynamic process, meaning the rate of formation of products by the forward reaction is equal to the rate at which the products re-form reactants by the reverse reaction.

How many moles are in a gas with a temperature of 21°C, pressure of 1,351 mmHg and a volume of 2,000 mL

Answers

Answer:

.147 moles

Explanation:

PV = n RT        choose the correct "R"   to be 62.364  L torr /(K-mol)

   T  needs to be in K  (so add 273.15)

1351 torr  * 2 L  = n  * 62.364 * (21 + 273.15 )

solve for n = .147 moles

How many moles are in 24 g of carbon

Answers

Answer:

[tex]\fbox {2 moles}[/tex]

Explanation:

Relation between grams of Carbon and moles :

[tex]\fbox {12 g Carbon = 1 mole}[/tex]

Multiply both sides by 2 :

⇒ 1 x 2 moles = 12 x 2 g

2 moles = 24 g

If it requires 45.8 cal to melt 8.4 g of a substance, what is the heat of
fusion of the substance?

Answers

Answer:

5.452  cal/g

Explanation:

45.8 cal / 8.4 g =   5.4523  cal/g

384.72 J is the heat of fusion of the substance.

What is the heat of fusion?

It is the change in the value of the enthalpy by providing energy i.e. heat, for a specific quantity of the substance.

Given data:

Heat of fusion  =?

Mass of substance = 8.4 g

Unknown:

Amount of energy required to melt the given mass = 45.8 cal

Solution:

To solve this problem, the amount of energy required to melt the substance is given as;

H  = m L

m is the mass

L is the heat of fusion

Insert the given parameters and solve;

H  = 8.4 g  x 45.8 cal = 384.72 J

Hence, 384.72 J is the heat of fusion of the substance.

Learn more about heat of fusion here:

https://brainly.com/question/19531870

#SPJ2

A 2.49 g sample of aniline (C6H5NH2, molar mass = 93.13 g/mol) was combusted in a bomb calorimeter with a heat capacity of 4.25 kJ/°C. If the temperature rose from 29.5°C to 69.8°C, determine the value of ΔH°comb for aniline.

Answers

The value of delta H° for aniline = 6415 Kj/mol

calculation

Step 1: find heat

Q (heat)  =  C (specific heat capacity)  x ΔT (change in temperature)

C= 4.25 kj/c°

ΔT = 69.8-29.5  = 40.3 c°

Q= 4.25 kj/c  x  40.3 c = 171.28 kj

Step 2:  find the moles of aniline

moles  = mass/molar  mass

= 2.49 g/ 93.13 g/mol =0.0267 moles

Step 3:  find delta H

171.28 kj/0.0267 mol = 6415 kj/mol

since the reaction is  exothermic  delta H = 6415 Kj/mol

Answer:

-6.41x10^3

Explanation:

2.49 is 3 significant figures, so your answer should reflect that. Since heat is lost to the surroundings, the reaction is exothermic, and the answer should be negative.

Other Questions
its math help me out Which of the following correctly describes what happens to liquid and gas particles withmore thermal energy?Select one:O a. Liquid and gas particles with more thermal energy expand.O b. Liquid and gas particles with more thermal energy condense.O c.Liquid and gas particles with more thermal energy rise.O d. Liquid and gas particles with more thermal energy fall. In which century did Marco Polo leave Italy 8 1/2 - 3/8=? pls answer fast This is the full question With the development of air flight and mass transit, humans are able to move very rapidly around the world.Which of the following is a possible consequence of increased human travel?Choose 1 answer: A user wants to print a spreadsheet horizontally on a piece of paper instead of vertically to fit more columns on a single page. What setting should the user enable on the printer for this print job to achieve this result for patients with prediabetes, what strategies does the diabetes prevention program show are effective in reducing the risk of progressing to type 2 diabetes? Which of the following is true of Sundiata? A. His pilgrimage to Mecca boosted trade and wealth.B. He made Timbuktu a Christian religious center.C. He recaptured the gold-producing areas of West Africa.D. He rejected Islamic influence. Under what conditions was Germany reunified? If the proportion of the total disposable income spent on consumer goods and services is 93 percent and if consumers spend 85 percent of each additional dollar, what is a. the apc? b. the aps? c. the mpc? d. the mps? An elephant went 119 km moving 42 km/h how many hours did the journey take?2 1/62 1/22 5/6 DF=Help me please:)) What command will prevent all unencrypted passwords from displaying in plain text in a configuration file?. Find the midpoint of the line segment with end coordinates of:(-1,7) and (3,-2)Give coordinates as decimals where appropriate. A student begins a proof of the law of cosines. His work is shown.(image below)The student made an error in ___. To correct this error, he should ___.After correcting this error, the student can use the ___ to relate sides x, y, z, and angle ___.1st blank answers:a, step 1b, step 2c, step 32nd blank answersa, define side AY in terms of angle Xb, define side XY in terms of angle Xc, define side AX in terms of angle Y3rd blank answersa, tangent functionb, law of sinesc, Pythagorean theorem4th blank answersa, Zb, Xc, Y describe the effect of the transformation (x,y) to (x,y+4)A. vertical stretch without reflectionB. horizontal translation of 4 unitsC. vertical stretch with reflectionD. Vertical translation of 4 units How did balkan nationalism contribute to world war one How is the role of a cable news anchor similar to and different from that of a network news anchor? Absurd answer will be reported immediately! write the icon of full justification