3. How many moles are in 1.49 x 1023 molecules of iodine?

Answers

Answer 1

Answer:

The answer is 0.25 moles

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\ [/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{1.49 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{1.49}{6.02} \\ = 0.247508305...[/tex]

We have the final answer as

0.25 moles

Hope this helps you


Related Questions

Explain why there is a difference in the thickness of the crust between the side of the moon facing the Earth and the side that faces away from the Earth?

Answers

Answer:

the lack of maria; the thicker crust means it was harder for giant impacts to pierce the crust and get darker basaltic lava bubbling up.

Explanation:

What does chemical weathering do to the original minerals (THIS IS SCIENCE BUT I COULDN'T FIND SCIENCE CATAGOREY)

Answers

Answer:

Chemical weathering changes the composition of the original minerals.

Explanation:

What is the half life of an atom that goes from 16000 g to 125 g in 163.24 days.

Answers

Answer:

[tex]23.32\ \text{days}[/tex]

Explanation:

N = Final mass of atom = 125 g

[tex]N_0[/tex] = Initial mass of atom = 16000 g

t = Time taken = 163.24 days

[tex]t_{1/2}[/tex] = Half life

We have the relation

[tex]N=N_0\dfrac{1}{2}^{\dfrac{t}{t_{1/2}}}\\\Rightarrow 125=16000\times \dfrac{1}{2}^{\dfrac{163.24}{t_{1/2}}}\\\Rightarrow \dfrac{125}{16000}=\dfrac{1}{2}^{\dfrac{163.24}{t_{1/2}}}\\\Rightarrow \ln0.0078125=\dfrac{163.24}{t_{1/2}}\ln0.5\\\Rightarrow t_{1/2}=\dfrac{163.24\times\ln0.5}{\ln0.0078125}\\\Rightarrow t_{1/2}=23.32\ \text{days}[/tex]

The half life of the atom is [tex]23.32\ \text{days}[/tex].

PLEASE HELP!!!!! NEED HELP ASAP!!!!!

Directions: Name the ionic compound created.
EXAMPLE- Sodium and chloride OR NaCl= Sodium chloride

Barium and sulfur =
Magnesium and bromine =
Al2O3 =
KCl =

Answers

Answer:

1.BaCO3 2.MgBr2 3.aluminum and oxygen 4.Potassium chloride

Explanation:

Compare a mixture and a compound. How are they alike?
Contrast a mixture and a compound. How are they different

Answers

Answer:

1.Difference.

Mixtures are physically combined and can be separated by physical means while compounds are chemically combined and are separated by chemical means.

2.Mixtures do not have mixed boiling and melting points while compounds have mixed boiling and melting points.

2.Similarity.

Both mixtures and compounds are composed of two or more substances or elements combined.

Both can be separated.

Similarity between Mixture and Compound.

Mixtures and compounds are alike in the following ways:

1. Both mixture and compound contains two or more substances.

2. Both mixture and compound can be separated.

3. Both mixture and compound have physical properties.

Differences between mixture and compound:

Mixtures and compounds are different in the following ways:

1. A mixture contains two or more substances that are not chemically combined together while a compound contains two or more substances chemically combined together.

2. A mixture can be separated by physical methods while a compound can only be separated by chemical methods.

3. Mixtures can not be represented using a chemical formula. Compounds can be represented by chemical formula.

4. Examples of mixtures include: milk, kerosene in water etc. Examples of compounds include water, sodium chloride etc

Learn more: https://brainly.com/question/184321

True or False:Excessive thermal energy will result in the removal of salt from the oceans.

Answers

Answer:

false

Explanation:

the excessive heat would cause the water to evaporate so it wouldn't remove the salt it would remove the water. what you would get would be an ocean bed with tons of salt at the bottom.

What is the overall charge of the compound, NaF?

+2

-2

-1

0

Answers

Answer: -1

Explanation: It is neutral because the Na and F atoms are transferring their valence electrons in order to become stable. This results in an overall stable atom. If we were to identify the individual charges of verbalized atoms, Na would have a positive charge, and F a negative charge - both of 1.

It's not -1.

the answer is (0), hope this helped

whats a proton? answer

Answers

Answer:

a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.

Explanation:

can i get brainliest

Answer:

a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.

Explanation:

Calculate the average atomic mass of antimony
Antimony-121 has a mass of 120.904 amu and a natural % abundance 57.21
Antimony-123 has a mass of 122.904 amu and a natural % abundance of 42.79
can you give the work aswell trying to understand how to do it

Answers

Answer:

Wow, now this one is a hard one, took me quite a while to figure it out but here it is

The abundances of the two isotopes is:

Antimony-121 = 57.2%

Antimony-123 = 42.8%

Explanation:

CAN SOMEONE PLEASE HELP ME WITH THIS

Answers

Answer:276ml

Explanation:

1. Give the similarity (or similarities) between Cl and CI^(-1).

Answers

Answer:

1) atomic number is the same. Both, chlorine atom and anion, have atomic number 17. They have 17 protons in nucleus of an atom.

2) both are the same element.

Explanation:

If a neutral compound is composed of carbon and hydrogen and you know that it has exactly 2 carbons connected by a double bond, how many hydrogens will the compound have?

Answers

Answer: 4 hydrogens

Explanation:

This is what the structure will look like C=C. Remember that it's important that all structures have a complete octet. As it looks right now each carbon is sharing 4 valence electrons so each needs 2 more bonds to hydrogen complete its octet.

Answer: 4 hydrogens

Explanation:

Which procedure is an attempt to correct a genetic disorder by replacing a mutated gene with a normal allele?

selective breeding
cloning
artificial selection
gene therapy

Answers

artificial selection

Answer:

Hi, the answer is C. Artificial Selection

I know this becasue I just finished my test

Explanation:

Which option will increase the rate of reaction?


A) removal of one of the reactants
B) decrease the volume of container
C) lower the temperature of reaction
D) reduce the pressure in the container ​

Answers

Answer:

B

Explanation:

when  you increase the pressure of a closed container , its volume decreased.

in general  when pressure is increased, rate of reaction is increased.

Which of the following is a component of natural gas? A)gasohol B)methane C)gasoline D)kerosene

Answers

Answer:

Methane

Explanation:

It is methane because, it comes from natural sources.

Which of the following is true with respect to energy in a closed system?
A.
Energy can be destroyed, but cannot be created.
.
Energy can be created, but cannot be destroyed.
B.
OOOO
C. The system's kinetic energy must equal its potential energy.
D.
The total amount of energy in the system always stays the same.

Answers

Answer:

D. The total amount of energy in the system always stays the same

Explanation:

In the closed system, the total amount of energy in the system always stays the same.

What is closed system?

Closed system is a arrangement in which exchange of energy or any material is restricted.

If any reaction is carried out in a closed system then energy of the system may convert from internal energy to potential or from potential to kinetic energy. But the total energy of the closed system is always remain same as before and after the reaction.

Hence option (D) is correct.

To know more about closed system, visit the below link:

https://brainly.com/question/1523500

A person is pushing a box with a mass of 25 kg. If it accelerates at 0.3 m/s2, what is the force being applied to the cart?

Answers

2.45 correct me if I’m wrong please

Answer:

The answer would be 80kg

Explanation:

Have a good day.

With a force of 5 newtons, Amanda pushes the stack of books to the right. At the same time, Jeremy, her little brother, pushes the stack of books to the left with a force of 10 newtons.

Answers

Answer:

A.  5 N to the left

Note: The question is incomplete. The complete question is given below:

With a force of 5 newtons, Amanda pushes the stack of books to the right. At the same time, Jeremy, her little brother, pushes the stack of books to the left with a force of 10 newtons.

What is the direction and magnitude of the resulting force?

A.  5 N to the left

B.  5 N to the right

C.  10 N to the right

D.  10 N to the left

Explanation:

Forces are vector quantities.

Vector quantities are quantities that can be represented both in magnitude and direction.

Forces have both magnitude and direction. Forces can be directed positively or negatively.

For example, in the question above, if forces acting to the right are considered to be in the positive direction, forces acting to the left are considered to be acting in a negative direction.

In the addition of forces, both their magnitude and direction are taken into consideration.

In the example above, taking forces acting to the right as positive and to the left as negative, the sum of the forces is:

Resultant force, F = (5 N) + (-10N)

F = -5 N

Therefore, the net force is 5 N and is directed towards the left

Answer:

5 N to the left

An object has a mass of 60 ounces and a volume of 30 cups. What is the density? _______ oz/cup (your answer should *only* be a number, round to one decimal place if needed) *

Answers

Answer:

2.0

Explanation:

Given data:

Mass of object = 60 ounce

Volume of object = 30 cups

Density = ?

Solution:

d = mass/ volume

d = 60 ounce/ 30 cup

d = 2.0 oz/cup

Thus, density of object is 2.0 oz/cup.

In the future, what would you expect to happen to the distances between galaxies?

Answers

The distances between galaxies are expected to increase.

This is due to the endless expansion of the universe, proposed by cosmological inflation.

Describe the role of the ocean in the water cycle?

Answers

Answer:

Don't get me wrong the seas are, by distant, the biggest store of water on soil, over 96% of all of Earth's water exists within the seas. Not as it were do the seas give dissipated water to the water cycle, they moreover permit water to move all around the globe as sea streams. I mean, that's all i know man, give me a break.

Explanation:

First of all, going off of the water cycle: evaporation, condensation, precipitation and collection
What would make the most sense that the ocean would have a role of? Well it would be evaporation in the water cycle because the ocean is 97.5% of all water and is the main source for condensation, precipitation and collection. But it’s main role is collection of water to be evaporated into the cycle.

Hope this helps :)

what happens to molecules when the temperature drops or lowers

A the molecules stop moving

B the molecules get closer together

C the molecules start moving faster

D the molecules become smaller

Answers

The answer for this one is A.

Identify the following examples as either physical or chemical change.
(Ill give brainliest if right)

Answers

Answer:

7. Chemical

8. Chemical

9. Physical

10. Physical

11. Physical

12. Physical

Explanation:

Based on the diagram, which statement explains how energy is conserved during this chemical reaction? (A) is also gained by the surroundings. B. The potential energy changes indicated by C and B involve energy lost by the surroundings. C. The potential energy lost by the reaction system (C) is also lost by the surroundings. D. The potential energy lost by the reaction system (B) is gained by the surroundinas​

Answers

Based on the diagram, the statement explains how energy is conserved during this chemical reaction is the potential energy lost by the reaction suystem (B) is gained by the surroundings.

What is exothermic reactions?

Those reactions in which eneregy is released during the whole process, because energy of product is less than the energy of reactants.

In the given diagram it is given that energy of the reactants are more as compare to the products, so the reaction is exothermic in reaction means heat is released during this reaction. This released energy will absorb by the surrounding of the reaction system to maintain the law of conservation of energy.

Hence, option (D) is correct.

To know more about exothermic reaction, visit the below link:

https://brainly.com/question/6357350

The statement that explains how energy is conserved during this chemical reaction is the potential energy lost by the reaction system (B) is gained by the surroundings.

What is conservation of energy?

The law of conservation of energy says that the energy of an isolated system never changed.

The energy neither be created nor destroyed.

Thus, the correct option is D. the potential energy lost by the reaction system (B) is gained by the surroundings.

Learn more about conservation of energy

https://brainly.com/question/13949051

#SPJ5

8 words of environmental problems​

Answers

Air Pollution.
Waste Management.
Ozone Layer Depletion.
Oceans
Fisheries.
Deforestation.
air pollution
deforestation
The carbon cycle, biohazard, carbon footprint, climate change, deforestation, biodiversity, pollution, and water pollution.

Determine a skier's velocity in km/h, if it takes her 1.7 min to ski down a
1.67 km slope.

Answers

Answer:

103

Explanation:

do not listen to the haters

Which belief is the basis of Ptolemy's geocentric model of the solar system?

Answers

Answer:

"Earth-centered," or "geocentric" Ptolemy thought that all celestial objects — including the planets, Sun, Moon, and stars — orbited Earth. Earth, in the center of the universe, did not move at all.

Explanation:

Answer:

Geocentric

Explanation:

Its the belief that earth was the center of the solar system instead of the sun

What is the temperature of someone with a fever? Select the better estimate.
40°F
40°C

Answers

Answer:

40°C

Explanation:

THIS S VERY HIGH FEVER

AS    40°C  =  104°F

A beaker contains 318 mL
m
L
of a 5.75 M
M
HCl(aq)
H
C
l
(
a
q
)
solution. Determine the new concentration of the solution after it is diluted by adding 143 mL
m
L
of water to the beaker.

Answers

Answer:

3.97 M

Explanation:

Given data:

Initial volume V₁  = 318 mL

Initial molarity M₁ = 5.75 M

New volume V₂=  461 mL

New concentration M₂= ?

Solution:

New volume V₂= 143 mL+ 318 mL

New volume V₂= 461 mL

Formula:

M₁V₁  = M₂V₂

M₂ = M₁V₁ / V₂

M₂ = 5.75 M × 318 mL / 461 mL

M₂ = 1828.5 M. mL/ 461 mL

M₂ = 3.97 M

help please it’s due today

Answers

The answer is 10 N left

Answer: I would say it would move 70 N right

Explanation: Well lets say its mass is heavy from the looks of the picture its a big box, anyways the girl with have all of her 30 newtons into it making it easier to move for the boy with 40 newtons plus 10 newtons left doesnt make sense neither does the 70 N left but why would it only move 10 to the right is 70 newtons are being used

on it?

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After how many years will Franciscos account reach $10,0004. If Francisco wanted to double his money in 12 years, what Interest rate would his account have to earn? Please help timed:) 30 pointsWhat is the overall message that the author is conveying in the story "I'm Not Going to Die"?"I light the cigarette and gladly inhale the bitter smoke. I sit inside the chalk house the girl drew. With the crumpled paper in my hand, I wait for the girl."(Asatryan 5)Think about the message of the story and answer the following questions:What is the symbol in this passage? What is the author trying to tell us? In other words, what is the abstract idea behind the use of that symbol? Alone, Brenda can dig a ditch in 5 hours. If Jack helps her, the two of them can dig the ditch in 3 hours. How long would it take Jack to dig the ditch himself?Brainliest if answered first Use the following information for the questionThe average travel time to work for a person living in kokomo is 17 minutes. 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