how many atoms are in a sample of uranium with a mass of 789 g.

Answers

Answer 1

Number of atoms : 1.996 x 10²⁴

Further explanation  

The mole is the number of particles(molecules, atoms, ions) contained in a substance  

1 mol = 6.02.10²³ particles

Can be formulated

N=n x No

N = number of particles

n = mol

No = Avogadro's = 6.02.10²³

mol of Uranium with mass=789 g (Ar U=238,02891 u) :

[tex]\tt mol=\dfrac{mass}{Ar}\\\\mol=\dfrac{789}{238,02891 u}\\\\mol=3.315[/tex]

Number of atoms :

[tex]\tt N=3.315\times 6.02\times 10^{23}\\\\N=1.996\times 10^{24}~atoms[/tex]


Related Questions


How are the functions of the mouth and stomach similar to each other

Answers

Answer:

they both break down food

Explanation:

Students are copying their homework assignment from the whiteboard in their dimly lit classroom Some students are wearing eyeglasses, some are not wearing anything over their eyes, and
one student is wearing dark sunglasses. Which material allows the least light to pass through it so that the smallest amount of light reaches the student's eyes?
Eyeglasses
Sunglasses
Air

Answers

Answer:

sunglasses

Explanation:

What is it called when a rock is broken down into smaller pieces by ice, glacier or water ? Chemical weathering, physical weathering, deposition, pollution

Answers

Answer:

deposition I hope this helps!!

Explanation:

Answer:physical weathering

Explanation:

Where do elements in the human body tend to be located on the PERIODIC TABLE? (NOT PERCENTAGES PLEASE)​

Answers

Answer:

Oxygen, Carbon, Hydrogern, Nitrogen, Sulfur, and Chlorine are all non-metals

Calcium, Potassium, Sodium, and Magnesium are all metals

Explanation:

The human body is made of elements at the most simple level. Oxygen in group 16, carbon in group 14, hydrogen located in group 1, and nitrogen and phosphorus in group 15.

What are the elements of the body?

The body is composed of elements and atoms at the most preliminary level of organization. The elements are placed in a periodic table based on the atomic number that is characteristic of their properties. The elements are arranged into 18 families and groups.

oxygen is located in group 16, carbon in group 14hydrogen in group 1nitrogen in group 15calcium in group 2potassium in group 1sulfur in group 16sodium in group 1chlorine in group 17magnesium in group 2

Therefore, elements are classified as alkali metals, alkaline metals, nonmetals, noble gases, halogens, and transition metals.

Learn more about elements, here:

https://brainly.com/question/13604973

#SPJ2

How is it determined the highest energy level an atom has
A. By the group number
B. By the period number
C. By the atomic number
D. By the mass number

Answers

Answer:

C. Atomic mass

Explanation:

i just did the quiz and got 100 :) i hope I get brainiest answer

The movement of electrons is what type of energy?

Answers

Answer:

Electrical energy

Explanation: Kinetic energy is motion, it is the motion of waves, electrons, atoms, molecules, substances, and objects. Electrical energy is the movement of electrons.

Answer: Electrical Energy

Explanation: The movement of electrons is Electrical Energy, because Educere says so :)

atoms are so small that approximately _________ of them can fit on the head of a needle?

Answers

Answer:

5 million

Explanation:

_Se2 → _Se3
A.2,2
B.1,2
C.3,2
D.2,3

Answers

Answer:

C. 3,2

Explanation:

these coefficients balance out the equation.

Balance: Na2SO4 + Cacl2 → CaSO4 + NaCl

10 points.

Answers

Explanation:

1Na2SO4 + Cacl2 → CaSO4 +2NaCl

Which phrase accurately describes the location of Africa? O mostly in the eastern hemisphere mostly south of the Tropic of Capricorn O borders the Pacific Ocean O lies north of Europe​

Answers

Answer:

mostly in the eastern hemisphere mostly south of the Tropic of Capricorn

Explanation:

The statement which best describes the location of Africa is that it is found

mostly in the eastern hemisphere.

Africa is a continent which comprises of countries such as Nigeria, Ghana,

Kenya etc. It is bounded on the north by the tropic of cancer and towards

the south of the tropic of capricorn.

Africa also lies in the eastern hemisphere and is found to the south of the

European continent.

Read more on https://brainly.com/question/24201145

A sample of gas occupies a volume of 598.9 mL and has a pressure of 675.6 torr. What will the pressure of the sample of gas be if the volume is decreased to 235 mL? Be sure to include units with your answer.

Answers

Answer:

1721.77 torr

Explanation:

The new pressure can be found by using the formula for Boyle's law which is

[tex]P_1V_1 = P_2V_2[/tex]

Since we are finding the new pressure

[tex]P_2 = \frac{P_1V_1}{V_2} \\[/tex]

From the question we have

[tex]P_2 = \frac{598.9 \times 675.6}{235} = \frac{404616.84}{235} \\ = 1721.773787...[/tex]

We have the final answer as

1721.77 torr

Hope this helps you

The illustration below shows the human skeletal system. Use the illustration to any questions at follow
Skull
Facial Cranium
bones
Clavice
Scapula
Humerus
Vertebral
column
Sternum
Una
Ribs
Radius
Sacrum
Carpals
Metacarpals
Phalanges
Tarsels
-Femur
-Patella
-Tibia
Fibia
Metatarsels
Phalanges
Using the illustration, which function do the bones of the skull mainly perfom?
A. They allow movement
B. They produce proteins
C. They protect tissues and organs
D. They connect muscles to tissues

Answers

im pretty sure its C, if im right please give me brainlist

The function where the bones of the skull mainly perfom should be that they protected the tissue and organs.

What is tissue and organs?

Here the tissue and organs should be considered as the basic structural units with respect to the bodies.

Here the tissues should be comprise of the cell collections that have the same kind of function while on the other hand, the organ should be the tissue collections.

Therefore, it protected the tissue and organs.

learn more about tissue here: https://brainly.com/question/19031918

How many grams are there in 2.34x10^23 atoms of Cu?

Answers

Answer 1


Explanation

Because it’s 1

The mass of the 2.34 × 10²³ atoms of copper is equal to 24.68 grams.

What is Avogadro's number?

The Avogadro constant can be defined as the proportionality factor that the number of constituent particles in a sample with the amount of substance.

Avogadro’s number can be described as a dimensionless number that represents the number of entities in one mole of any substance. These elementary entities can be molecules, atoms, ions, electrons, or protons, etc.

Avogadro’s constant has a value approximately equal to 6.022 × 10²³ mol⁻¹.

Given, the number of atoms of copper = 2.34 × 10²³

The atomic mass of Cu Copper = 63.5 g/mol

So 6.022 × 10²³ atoms of Cu have mass = 63.5 g

Then 2.34 × 10²³  Cu atoms will have mass = [tex]\frac{63.5 \times 2.34 \times 10^{23}}{6.02 \times 10^{23}}[/tex] = 24.68 g

Therefore, 24.68 grams of Cu are there in 2.34 × 10²³ atoms of Cu.

Learn more about Avogadro's number, here:

brainly.com/question/11907018

#SPJ2

The chemical formula for zinc sulfate

Answers

Answer:

ZnSO4

Explanation:

There

true or false, vaporization that occurs at the surface of a liquid is called evaporation

Answers

Answer:

True

Explanation:

Vaporization that happens below the surface is boiling, above the surface is evaporation :)

Answer:

True

Explanation:

it evaporates because of the temperature difference

what type of weather forecasting can forecast from 3-7 days? I NEED ANSWERS FAST!!!

Answers

Answer:

WPC medium range forecasting

Explanation:

What structures are found in
plant cells that are not found in animal cells?

Answers

Answer:

Plant cells have a cell wall, chloroplasts and other specialized plastids, and a large central vacuole, which are not found within animal cells. The cell wall is a rigid covering that protects the cell, provides structural support, and gives shape to the cell.

Explanation:

MOST BRAINLIEST

if you drop soap on the floor is the soap dirty or is the floor clean?

Answers

Answer:

hahahaha the soappp is dirty and the floor gets clean

You’ve been waiting for the bus and your hands become cold. When you get onto the bus and sit down, you put your hands under your legs to warm up. After a while your hands feel warmer but your legs feel colder. Explain this with regards to what you know about thermal energy transfer.

Answers

Explanation:

The First Law of Thermodynamics states that energy cannot be created or destroyed in an isolated system. In other words, energy can be converted from one form into another, but it cannot be created nor destroyed.

Conduction is the transfer of energy from one molecule to another by direct contact. This transfer occurs when molecules hit against each other, which can take place in solids, liquids, and gases.

When you put your cold hands under your legs to warm your hands up, the heat energy from your legs is being transferred to your hands through conduction. However, since energy cannot be created, there is no extra heat energy that can instantaneously replace the heat created by your legs.

Every metabolic process involves energy transfer. Since as the total energy is conserved and thus no loss or gain of energy will be there in a system and to maintain this equilibrium energy transfer from lower energy spot to higher energy spot.

What is thermal energy?

Thermal energy is the energy in the form of heat and which can transfer from one part to the other as any other energy form.

As energy is conserved in a system there will be no net gain or loss of energy overall. Thus energy lost from one part travels to the other parts. Any energy forms transfer from a low intense area to high intense area.

When our hand cools down we may warm them up by rubbing on legs. Where heat energy is transferred from our legs to hands to warm it up. Thus here temperature is given to a colder part from a hot part.

This is an example of heat transfer hence, our legs cools down because some of its temperature is lost to hands still the overall temperature of the body remains balanced.

To find more about heat transfer, refer the link below:

https://brainly.com/question/13433948

#SPJ5

What is true of both galvanic and electrolytic cells?
A. Reduction happens at the cathode.
B. They are spontaneous. .
C. They are nonspontaneous.
D. Oxidation happens at the cathode.​

Answers

Answer:

reduction happens at the cathode

Explanation:

Just took the test.

Reduction happens at the cathode. Hence, option A is correct.

What is an electrolytic cell?

An electrolytic cell converts electrical energy into chemical energy or vice versa.

Oxidation-reduction reactions are balanced by two half overall chemical equations into an oxidation equation and a reduction equation.

Hence, reduction happens at the cathode in both galvanic and electrolytic cells.

Learn more about electrolytic cells here:

brainly.com/question/4030224

#SPJ2

23) The function of an organelle is related to its
A. system.
B. structure.
C. blood cell.
D. job.
Help plzzz

Answers

Answer:

Well, it could be B or D but I would say B.

Explanation:

The structure of an organelle is usually fit to its function so it is most likely B.

Hope this helps!

The answer is (B) Structure

which material allowed house to have highest average internal Temperature? explain your answer

A.Fiberglass
B.Brick
C.Soil ​

Answers

Answer: Brick


Brick retains the most heat out of all the choices.

why does no one love me? when will i feel appreciated?

Answers

Answer:

I appreciate you- owo... and people do love you. uwu. even tho I am a stranger I love you :D. ❤

You're the best person anyone could ever ask for. Trust me you're enough <3

An oxide of arsenic contains 3.26 g of arsenic and 1.04 g of oxygen. What is the empirical formula for this oxide?

Answers

The empirical formula for this oxide : As₂O₃

Further explanation:

Given

mass of Arsenic=3.26 g

mass of Oxygen = 1.04 g

Required

The empirical formula

Analysis

find mole of elementsdetermine the ratio of each element

Solution

mol of Arsenic(MW=74,9216 u) :

[tex]\tt mol=\dfrac{3.26}{74,9216}=0.0435[/tex]

mol of Oxygen(MW=15.999 u) :

[tex]\tt mol=\dfrac{1.04}{15.999}=0.065[/tex].

The ratio for each element (divide by smaller mol⇒Arsenic)

Arsenic : Oxygen :

[tex]\tt \dfrac{0.0435}{0.0435}\div \dfrac{0.065}{0.0435}=1\div 1.5\rightarrow 2\div 3[/tex]

The empirical formula : As₂O₃

two or more atoms joined together form a _______

Answers

Answer:

When two atoms join together they make compounds

Explanation:

A molecule is formed when two or more atoms join together chemically. If atoms combine that are of two or more different elements, we call that a compound. All compounds are molecules, but not all molecules are compounds.

When hydrogen reacts with active metals, it
shares electrons
gains one electron
loses one electron
O loses two electrons

Answers

Atomic hydrogen is very reactive. It combines with most elements to form hydrides (e.g., sodium hydride, NaH), and it reduces metallic oxides, a reaction that produces the metal in its elemental state. ... Almost all metals and nonmetals react with hydrogen at high temperatures.

Which of the following are soluble in water? Select all that apply.
K2SO4
CaCl2
LiOH

Answers

I think it is

K2SO4?

Answer:

1 And 2 are soluble in water

PLEASE HELP

How many electrons can be held in a sublevel n=4?

Answers

it can hold 32 electrons

A gas is allowed to expand from a volume of 400 ml to 2000 ml at a constant temperature. If the the initial pressure is 3 atm, calculate the final pressure exerted by the gas

Answers

Answer:

[tex] P_{2}) = 0.6 \; atm [/tex]

Explanation:

Given the following data;

Initial volume = 400 mL

Final volume = 2000 mL

Initial pressure = 3 atm

To find the final pressure P2, we would use Boyles' law.

Boyles states that when the temperature of an ideal gas is kept constant, the pressure of the gas is inversely proportional to the volume occupied by the gas.

Mathematically, Boyles law is given by;

[tex] PV = K[/tex]

[tex] P_{1}V_{1} = P_{2}V_{2} [/tex]

Substituting into the equation, we have;

[tex] 3 * 400 = P_{2}* 2000[/tex]

[tex] 1200 = 2000P_{2}[/tex]

[tex] P_{2}) = \frac {1200}{2000}[/tex]

[tex] P_{2}) = 0.6 \; atm [/tex]

What is the "mass number"? What does the mass number tell you?

Answers

Total number of protons and neutrons in the atomic nucleus. When you see a periodic table the order is usually the atomic number, the element symbol, the name, and then the atomic mass.
Other Questions
El banco ______ la universidad An equation is shown below: 4c + 2(x-3) = 4x + 2x - 11 Part A: solve the equation and write the number of solutions. Show all the steps. Part B: Name one property you used to solve this equation. what is the glue that holds together our solar system plzzzz some one help I want step by step I'm confused What's 56 of 300 How much power will it take to move a 10 kg mass at an acceleration of 2 m/s a distance of 10 meters in 5 seconds? solve cos^30- sin^30 I NEED HELP!!!! I AM TERRIBLE AT ENGLISH AND DONT KNOW WHICH ONE IT IS. DF bisects EDG. Find FG. The diagram is not to scale. Help ASAP plz and thx u By building green and reducing electricity consumption, what potential environmental, economic, and social benefits could be gained? Please help me this is due less then 30 mins. If you are good with Spanish please help me and look at the picture and use usted and ellos and also the second picture looks like the lady packing a suitcase. Read the excerpt from the Declaration of Sentiments.He has made her, morally, an irresponsible being, as she can commit many crimes with impunity, provided they be done in the presence of her husband. In the covenant of marriage, she is compelled to promise obedience to her husband, he becoming, to all intents and purposes, her masterthe law giving him power to deprive her of her liberty, and to administer chastisement.Which statement best describes the relationship between Stantons diction and her purpose?Stanton uses words with positive connotations to encourage women to discover their voices.Stanton uses words with negative connotations to emphasize the persecution of women.Stanton uses words with positive connotations to highlight womens road toward social progress.Stanton uses words with negative connotations to criticize women for their apathy.: Which equation demonstrates the distributive property? A = 7(1+6)=7(6+1) B = (7x1) x 6 = 7(1x6) C = (7x1) x 6 = 7(6x1) D = 7(1+6) = (7x1) + (7x6) HELP END OF SEMSSTER Help usatestprep need answer Pls explain how to solve this problem pls ASAP if you know it pls! Im sorry yall Im a bit slow but I need this answered ASAP its due tmr . What was one of the weaknesses of the United States government under the Articles of Confederation?1-Small states did not have independence2-The large states had also done it. many votes3-The Supreme Court has too much power4-Congress cannot collect taxes can some one help me plz 4j + 4 =Next, subtract 4 from both sides.4j Two kinds of tickets to an outdoor concert were sold: lawn tickets and seat tickets. Less than 400 tickets in total were sold. Lawn tickets cost $30 each and seat tickets cost $50 each. The organizers want to make at least $14,000 from ticket sales.Write a system of inequalities to represent the situation. Be sure to define your variables.