how many moles are represented by 3.01x10^23 helium atoms

a. 1 mole

b. 0.50 moles

c. 0.75 moles

d. 5 moles

Answers

Answer 1

Answer:

b. 0.50 moles

Explanation:

To solve this problem we use Avogadro's number (6.023x10²³ atoms/mol).

By dividing the number of atoms (or molecules) by that number, we can calculate how many moles they represent.

3.01x10²³ atoms ÷ 6.023x10²³ atoms/mol = 0.50 moles

So the answer is option b. 0.50 moles.


Related Questions

4. How many moles in 2.0 x 1023 atoms of H2O?
here.

Answers

Answer:

0.33 moles

Explanation:

to find the number of moles,

moles = number of atoms / avogadro's number ie 6.02 x [tex]10^{23}[/tex]

moles = 2.0 x [tex]10^{23}[/tex] / 6.02 x [tex]10^{23}[/tex]

moles = 0.33 mol

The element fluorine has an atomic number of
a. 10
b. 9
c. 19
d. 28

Answers

Answer:

B.9

Explanation:

It has a atomic number of 9

A pile of wind blown sand is called a A. Delta B. Groin C. Meander D. Dune

Answers

Answer:

I am pretty sure its called a sand dune

Explanation:

Help me please O w O

Answers

Answer:

42 km/h

Explanation:

MULTIPLE CHOICE QUESTION

Electrons fill in energy levels in which of the
following ways?

1.Lowest energy level first, so it fills in the inside
rings first

2.Lowest energy level first, so it fills in the
outside rings first

3.Highest energy level first, so it fills in the inside
rings first

4.Highest energy level first, so it fills in the outside
rings first

Answers

Answer:

I think the answer is 3. Highest energy level first, so it fills in the inside rings first

Electrons occupy the lower-energy orbitals first, then go on to fill the next higher-energy orbital until all of the electrons contain been placed.

Which energy levels do electrons fill first?

Most of the time, electrons occupy the lower-energy orbitals first, then go on to fill the next higher-energy orbital until all of the electrons have been positioned.

The lowest energy level is always added to initially until it has as many electrons as it can have. The following higher energy level is then filled with electrons, and so on.

The lowest energy level is always filled up with additional electrons first, up to the point where that level can hold no more, and then further electrons are added to the next higher energy level, and so on. A level's total number of orbitals determines how many electrons can be present at that energy.

Therefore, the correct answer is option 3. Highest energy level first, so it fills in the inside rings first.

To learn more about Electrons refer to:

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Pls predict and balance the following Chemical equations 30points (5 per question)
Will mark Brainliest

1. Na2(SO4) (aq) + Ba(NO3)2(aq) -->

2. Na(NO3)(aq) + NH4Cl(aq) -->

4. ZnCl2 (aq) + K (SO4) (aq) -->

5. ZnCl2 (aq) + Na2S (aq) -->

6. Na(C2H3O2) (aq) + Ag(NO3) (aq) -->

Answers

Answer:

1. Na2SO4 + Ba(NO3)2 → NaNO3 + BaSO4

2. NaNO3 + NH4Cl → NaCl + NH4NO3

4. Sorry, I don't know

5. Refer to the attachment..

6. NaC2H3O2(aq) + AgNO3(aq) = NaNO3(aq) + AgC2H3O2

Hope it can help you and please mark me as a brainlist...

[tex] \huge{\blue{Thank \: you}}[/tex]


1. Na2(SO4) (aq) + Ba(NO3)2(aq) -->
Answer: NaNO3 + BaSO4 - Chemical Equation Balancer.

2. Na(NO3)(aq) + NH4Cl(aq) -->
Answer: NaNO3 + NH4Cl → NaCl + NH4NO3 - Balanced equation

4. ZnCl2 (aq) + K (SO4) (aq) -->
Answer: (This is an impossible reaction)

5. ZnCl2 (aq) + Na2S (aq) -->
Answer: no reaction occurs

6. Na(C2H3O2) (aq) + Ag(NO3) (aq) -->
Answer: NaC2H3O2(aq) + AgNO3(aq) = NaNO3(aq) + AgC2H3O2

(I’m not sure if all are right, I’m sorry but this is the best I could do. Hope it helps you.)

What happens when the compound Mgo is formed? (5 points)
Oxygen transfers two electrons to magnesium.
Oxygen receives two electrons from magnesium.
Magnesium forms an ion with -1 charge; oxygen forms an ion with +1 charge.
Magnesium forms an ion with +1 charge; oxygen forms an ion with -1 charge.

Answers

Answer:

Oxygen receives two electrons from magnesium.

Explanation:

Hello!

In this case, considering the chemical reaction by which magnesium oxide is produced:

[tex]2Mg+O_2\rightarrow 2MgO[/tex]

In that case, if we show up the oxidation states, we have:

[tex]2Mg^0+O_2\rightarrow 2Mg^{2+}O^{2-}[/tex]

In such a way, since metals, like magnesium, have the capacity to lose electrons, rather than receive them, we infer why it turns out with +2 rather than -2; thus, we the correct answer is "oxygen receives two electrons from magnesium." because it results with -2 in MgO.

Best regards!

Answer:

Oxygen receives two electrons from magnesium.

Explanation:


The electron domain and molecular geometry of FO2 is?
A.tetrahedral,trigonal planar
B.tetrahedral, bent
C.trigonal pyramidal, linear
D.trigonal pyramidal, seesaw

Answers

Answer:

C.

Explanation:

Apollo 11 made a ______ landing.

Answers

Answer:

Apollo 11 made a capsule landing

Explanation:

Answer: i don’t know what type of landing you mean

Explanation:

They did a lunar landing then reentry and then capsule landing.

IF YOU COME THEN YOU WILL GET BRAINLIEST HURRY!!!!
Describe how wind, water, ice and gravity move soil through erosion below.

Answers

Answer:

It's big brain time

Explanation:

Weathering is the process of breaking rocks into sediment while erosion is the process that wears away this sediment and other materials and moves them from one location to another.  Agents of erosion include gravity, glaciers, wind, and water.  Erosion only occurs when these agents have enough energy.  The moment agents of erosion lose their energy and momentum they deposit their load.  This process is known as deposition.  The load is what the agent is carrying.  As agents of weathering lose their energy, the heavier sediment is dropped.  As the energy is lost, gravel, then sand, then silt, and then clay are deposited, due to their respective masses.

Mass movement, sometimes referred to as mass wasting, is what we call the movement of surface material due to gravity, water, wind, and ice.  There are five main types of mass movements: falls, creep, flows, slides, and slump.

The number of valence electrons in lithium is 2.
TRUE
FALSE

Answers

Answer:

False

Explanation:

Ok then what im bored

what is the difference between polar and non-polar

Answers

Answer:

Polar molecules occur when there is an electronegativity difference between the bonded atoms. Nonpolar molecules occur when electrons are shared equal between atoms of a diatomic molecule or when polar bonds in a larger molecule cancel each other out.

Explanation:

Polar molecules occur when there is an electronegativity difference between the bonded atoms. Nonpolar molecules occur when electrons are shared equal between atoms of a diatomic molecule or when polar bonds in a larger molecule cancel each other out.

The diagram shows a parent hydra with an offsprinly.
Offspring
Which statement best explains why the offspring has no genetic variation
from the parent?
A. It received genes for producing traits different from the parent's.
B. It received a mix of genes from two different parents.
O C. It received genes that are exactly the same as the parent's genes.
O D. It received chromosomes with many different genes.

Answers

Answer:

C. It received genes that are exactly the same as the parent's genes

In asexual reproduction in hydra,offspring has no genetic variation from the parent because it received genes that are exactly the same as the parent's genes.

What is asexual reproduction?

Asexual reproduction is a type of reproduction where the offsprings are  not produced by the combination of genetic material of two individuals which are of different sexes rather they are produced by a single parent.

It is the  not the dominant form of reproduction in living beings.Here, the offsprings are identical to their parents as there is no recombination of genetic material.It is observed in both unicellular or multicellular organisms.

There is no fertilization or gamete formation taking place.Types of asexual reproduction include budding, binary fission,fragmentation,etc.

Learn more about asexual reproduction,here:

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A certain atom has 50 protons and 69 neutrons. Which statement(s) below are true about this atom? Choose ALL that apply.
this atom is an atom of thulium (Tm)
m this atom has a mass of 69 amu
this atom is an isotope of tin-120
m this atom has an atomic number of 50

Answers

Answer:

D.) This atom has an atomic number of 50

Explanation:

A is wrong because we determine the type of atom by their number of protons, not the number of neutrons. This makes the atom Tin (Sn).

B is wrong because both protons and neutrons contribute to the weight of an atom, not just neutrons

C is wrong because the correct name for this isotope would be tin-119, which is calculated by adding the protons and neutrons

D is correct because isotopes of the same element always share the same atomic number

WILL GIVE BRAINLIEST TO PERSON WHO ANSWERS FASTEST AND CORRECT BUT ANY ANSWERS TO JUST GET POINTS WILL GET REPORTED AND DELETED
Which process in the water cycle returns water from the atmosphere back to Earth? *
5 points
A) evaporation
B) precipitation
C) collection
D) ground water

Answers

Answer:

B

Explanation:

When water is at the surface of the ground, it evaporates and goes back to the clouds for which causes it to rain therefore returning water back.

Here is a model that shows key information about Earth
and the Sun
Direction of
Earth's rotation
Axis
Which statement best explains the pattern of daytime and nighttime on
Earth?
A. The Sun must revolve around Earth once every 24 hours
B. Earth's axis of rotation must tilt back and forth every 12 hours.
C. Earth must complete one rotation on its axis every 24 hours.
D. The Sun's energy must come from a different direction every 12
hours

Answers

The statement information about earth and the sun direction of earth's rotation axis best explains the pattern of daytime and night-time on earth is " earth must complete one rotation on its axis every 24 hours".

What is sun?

The sun was composed of incredibly hot gases, as well as then it heats as well as illuminates the entire solar system.

What is earth?

The earth was referred to as a "one-of-a-kind" planet since that is the only one on the planet with ideal circumstances for life.

Day though night are caused by the Earth's diurnal revolution. From west to east, the earth rotates on its axis for around 24 hours. As a result, the sun appears to rotate from east to west, resulting in sunset and sunrise. except for polar is, which remains stationary in the north polar sky along the earth's axis, all those other stars move from east to west.

Therefore, the correct answer will be C.

To know more about earth and sun.

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Answer:

THE ANSWER IS (C.)

Explanation:

Why do molecules with dipole-dipole force have higher melting and boiling points than molecules
that only exhibit London Dispersion force?

Answers

Answer:

Because dipole - dipole force is stronger than london dispersion force

Explanation:

Intermolecular forces determines a wide range of physical properties of matter of which melting point is one of them.

Both london dispersion forces and dipole- dipole forces are vanderwaals force.

But diople - dipole forces exists between polar molecules which are molecules with permanent dipoles.

In london dispersion forces the dipole is temporary

What are the products of the combustion of a hydrocarbon?
carbon and oxygen
carbon dioxide and water
carbon and hydrogen
carbon dioxide and hydrogen

Answers

Answer:

I think carbon and hydrogen

Answer:

Its carbon and hydrogyen

Explanation:

got it right on edge

Calcium is a metal that is part of bone. it has several naturally-occurring
isotopes. Calculate the average atomic mass. Ca-40 39.96amu 96.941%,
Ca-42, 41.96 amu 0.647%, Ca-43 42.96amu 0.135% Ca-44 43.96 amu
2.086%, Ca-48 47.95amu 0.187% *
pls help

Answers

The average atomic mass of Ca : 43.943 amu

Further explanation

Given

Isotopes of Ca

Required

The average atomic mass

Solution

Isotopes are elements that have the same Atomic Number (Proton)

Atomic mass is the average atomic mass of all its isotopes

Avg atomic mass = m1.%m1 + m2.%m2....mn.%mn

m1 = isotope 1

m2 = isotope 2

% = abundance of the elements in nature

Input the value :

avg atomic mass = 39.96 x 0.96941 + 41.96 x 0.0647+42.96 x 0.0135 + 43.96 x 0.02086 + 47.95 x 0.0187

avg atomic mass =43.943 amu

1.which electromagnetic wave has the; longest wavelength, lowest speed, highest frequency, and greatest energy ?

2. Which visible light wave has the; longest wavelength, lowest speed, highest frequency, and greatest energy?

(Please Help I would gladly appreciate it 100 points will be given)

Answers

Radio waves infrared rays, visible light, ultraviolet rays, X-rays, and gamma rays are all types of electromagnetic radiation. Radio waves have the longest wavelength, and gamma rays have the shortest wavelength.

And this one please thank you.

Answers

Answer:

E

Explanation:

Look at bottom numbers.

90 → 88 + x

it means,

90=88+x

hence x = 2

it is also valid for top numbers.

230=226+y

y = 4

2. Explain how conduction, convection and radiation all contribute to heating the Earth's
surface and atmosphere.

Answers

Answer: Conduction, radiation and convection all play a role in moving heat between Earth's surface and the atmosphere. Since air is a poor conductor, most energy transfer by conduction occurs right near Earth's surface. ... During the day, sunlight heats the ground, which in turn heats the air directly above it via conduction.

HOPE THIS HELPS

Carbon dioxide is used by plants for ___?​

Answers

Answer:

photosynthesis

Explanation:

that's the way plants feed themselves

Answer:

photosynthesis

Explanation:

I hope i helped

pls help me i dont understand this question

Answers

Answer:

Explanation:

I'm not sure, don't hate me if i'm wrong but i think the third one is the answer.

Answer:

The question is asking what does not have anything to do with the bond formation.

How many grams of zinc chloride will be produced from 55. grams of zinc assuming hydrochloric acid is available in excess

Answers

Answer:

Mass = 114.5 g

Explanation:

Given data:

Mass of zinc = 55 g

Mass of ZnCl₂ produced = ?

Solution:

Chemical equation:

Zn + 2HCl     →      ZnCl₂ + H₂

Number of moles of Zn:

Number of moles = mass/molar mass

Molar mass of Zn = 65.4 g/mol

Number of moles = 55 g/  65.4 g/mol

Number of moles = 0.84 mol

Now we will compare the moles of Zn and zinc chloride,

               Zn           :          ZnCl₂

                1             :           1

              0.84        :          0.84

Mass of ZnCl₂:

Mass = number of moles × molar mass

Molar mass of ZnCl₂= 136.3 g/mol

Mass =  0.84 mol × 136.3 g/mol

Mass = 114.5 g

which part of this chemical process requires energy WILL GIVE BRAINLIEST

Answers

Answer:

Its c hope this helps ;)

Explanation:

Answer:

Answer is D

Explanation:

Am smort

The concentration of KIO3 in solution A is 0.04 M. Calculate the number of moles of potassium iodate in 1 mL of this solution.

Answers

Answer:

Number of moles of KIO₃ =  4.0×10⁻⁵ mol

Explanation:

Given data:

Concentration of solution = 0.04 M

Volume of solution = 1 mL

Number of moles of KIO₃ = ?

Solution:

Molarity = concentration

Molarity = number of moles / volume in L

We will convert the volume into L.

1 mL×1 L /1000 mL

0.001 L

Now we will put the values in formula,

0.04 M = number of moles / 0.001 L

Number of moles = 0.04 M ×0.001 L

Number of moles = 4.0×10⁻⁵ mol

what volume (in L) of ethane (C2H6) will be required to produce 42.5 L of carbon dioxide in the reaction below?

2C2H6(g)+7O2(g)->4CO2(g)+6H2O(g)

Answers

Answer:

21.25

Explanation:

Much of the light that a black cloth absorbs is changed to heat. True or false​

Answers

Answer:

True

Explanation:

Hope this helps you complete the quiz :)

1pt Twins raised in different families still exhibit similar mannerisms, indicating that at least some behavior is
O A. genetis
OB. environmental
O C. instinctual
OD. learned

Answers

The answer is A, genetic.


Twins reared apart help identify genetic and environmental influences on behavioral development, this allowed direct estimates of genetic effects on behavior and health, because they share all their genes, but differ in their environments.
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