How many moles are in 8.63 x 103 atoms of Li?

Answers

Answer 1
Answer:

1.43 × 10⁻²⁰ mol Li

General Formulas and Concepts:

Math

Pre-Algebra

Order of Operations: BPEMDAS

Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to Right

Chemistry

Atomic Structure

Using Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:

Step 1: Define

8.63 × 10³ atoms Li

Step 2: Identify Conversions

Avogadro's Number

Step 3: Convert

Set up:                              [tex]\displaystyle 8.63 \cdot 10^3 \ atoms \ Li(\frac{1 \ mol \ Li}{6.022 \cdot 10^{23} \ atoms \ Li})[/tex]Multiply/Divide:                [tex]\displaystyle 1.43355 \cdot 10^{-20} \ moles \ Li[/tex]

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

1.43355 × 10⁻²⁰ mol Li ≈ 1.43 × 10⁻²⁰ mol Li


Related Questions

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.

15.
Copper (II) carbonate dissociate when heated strongly according to the
chemical equation.
Kuprum (II) karbonat terurai apabila di panaskan mengikut persamaan kimia
berikut.
CuCO
CuO + CO2
What is the mass of copper(II)oxide formed when 12.4g of copper(11) carbonate
dissociate completely?
[Relative atomic mass: Cu = 64, 0 = 16, C = 12]
Berapakah jisim kuprum(II)oksida yang terbentuk apabila 12.4g kuprum(11)
karbonat terurai selengkapnya.?
[Jisim atom relatif. Cu = 64, 0 = 16, C = 12]
A
8.0 g
B
16.0 g
C
24.8 g
D
160 g​

Answers

I’ll say the answer is d 160 g

Chemistry 1 - Types of Radioactive Decay

Answers

Answer:

Explanation:

The reaction expression is given as:

           ⁴⁰₁₈ Ar   →   X  +  ⁰₁B  

To solve this problem, we must bear in mind that both mass number and atomic number must be conserved.

 So;

For the mass number:

               40  = A + 0

                 A  = 40

For atomic number:

                 18  = Z + 1

                  Z = 18 - 1  = 17

An atom is identifiable by the atomic number. Since the atomic number of X is 17 then it is Cl, chlorine


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:

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.

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.

How do you calculate the percent composition of an element in a compound

Answers

Answer:

Percent composition is calculated from a molecular formula by dividing the mass of a single element in one mole of a compound by the mass of one mole of the entire compound. This value is presented as a percentage.

Explanation:

Can someone help me please :)

Answers

I think it’s the third option but I’m not entirely sure
I’m sure it’s the third one!

What is the function of the vacuole?
to make proteins
for storage
to transport materials
to control all cell functions

Answers

Explanation:

In animal cells, vacuoles are small and help sequester waste products. In plant cells, vacuoles help maintain water balance. Therefore the answer should be B. For Storage

Hope this helps!

Please mark brainliest!

On the acid side you can find things like.... *

Answers

Answer:

jolly ranchers

Explanation: yes

How would you find the average speed of a marathon runner throughout an entire race? A Divide the total distance the runner travelled by the total time they took to travel that distance B Divide the total time the runner it took the runner to travel that distance by the the total distance they travelled C Multiply the total distance the runner travelled by the total time they took to travel that distance D Multiply the total time the runner it took the runner to travel that distance by the the total distnace they travelled

Answers

Answer:

distance divided by time so A

Explanation:

The element oxygen, represented by the symbol O, is classified as
A. a compound.
В. a mixture.
C. a solution.
D. a pure substance.


Please help soon! :))

Answers

D pure substance :)

If you have 8.5 moles of water (H2O), how many grams of water do you have?

Answers

Answer: i think it is 144.16

Explanation:

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.

I am listing the order starting with new moon.
New Moon
Waxing Crescent
first quarter
waxing gibbous
full moon
waning gibbous
last quarter
waning crescent
and new moon again.

Answers

Answer:

new Moon.

waxing crescent Moon.

first quarter Moon.

waxing gibbous Moon.

full Moon.

waning gibbous Moon.

last quarter Moon.

waning crescent Moon.

New moon

Explanation:

Your answer is correct

URGENT! plz help me T-T
The compound MnO2 could either have a +4 or a +2 oxidation state on the manganese (Mn) atom. Explain how either scenario could occur.

Answers

Answer:

See explanation

Explanation:

Manganese is a transition element. All transition elements have incompletely filled d orbitals which ultimately makes them to exhibit a variable oxidation state.

Manganese has electronic configuration of [Ar]4s23d5. This means that two electrons could be lost from the s orbital to yield Mn^2+. Also, two electrons could be lost from both s and d orbitals to yield Mn^4+

84 pt =_____ qt

5.0 gal =_____ L​

Answers

Answer:

84 pt =__50.4399___ qt

5.0 gal =___18.9271__ L​

Explanation:

Have A Wonderful Day!!

Answer: 84 pints = 42 quarts

5.9 gallons = 1.89271

Explanation:

12. Describe an open system​

Answers

Answer:

An open system is a system that has external interactions. An open system is contrasted with the concept of an isolated system which exchanges neither energy, matter, nor information with its environment. An open system is also known as a flow system.

How does the number of tin atoms in the sample compare to the number of aluminum atoms in a 20 gram sample of each (Sn:Al)

Answers

The number of Al atoms is greater than the number of Sn atoms

Further explanation

Given

20 gram sample of Tin and Aluminum

Required

Number of atoms

Solution

1 mol = 6.02 x 10²³ particles (atoms, molecules, ions)

So the number of atoms of each element is determined by the number of moles. The greater the number of moles the greater the number of atoms

moles Sn-Tin(Ar = 118,71 u)

mol = mass : Ar

mol = 20 : 118,71 u

mol = 0.168

moles of Al-Aluminum(Ar=26.9815 u)

mol = 20 : 26.9815 u

mol = 0.741

So the number of Al atoms > number of Sn atoms

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:

An analog and a digital version of an audio signal were copied.
Analog wave
Digital wave
Original
Original
wmin TAILLAMOUNTAIN
Varan TO
Copy
Copy
Which conclusion is supported by the results shown in the table?
A. Digital waves can be copied without damaging the audio signal,
whereas analog waves cannot
B. Both digital and analog waves become damaged during the
copying process
C. Analog waves can be copied without damaging the audio signal,
whereas digital waves cannot
D. Noise is introduced when both digital and analog waves are
copied

Answers

Answer:

The answer is A.Digital waves can be copied without damaging the audio signal, whereas analog waves cannot

Explanation:

I took AP EX quiz.

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

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

PUN
Which of the following is an example of a Response to Change? (Read carefully, the other three are Adaptations)
(A)Thoms and Spikes as a protective mechanism
(B)Polar Bears transparent fur and black skin
(C)Plants turning toward the light
(D)Frogs webbed feet

Answers

I believe the answer would be: C) Plants turning toward the light.

Due to the lower pressure on top of Mt. Everest, water can
boil before the temperature gets to 100°C. If pure water
begins to boil at 70°C on Mt. Everest, what is this
temperature in kelvins?
Select one:

a.273 K

b.163 K

c.343 K

d.373 K

Answers

c. 343K
70 degrees C + 273 = 343

help asap plz will give brainliest !!!!!!

Answers

Answer:B and A

Explanation:

i think

they are both radiation. the toaster because the wires are heated, toasting the bread without touching it. the fire because, they’re heat waves, also like the toaster.

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.

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:

The compound F2O has two lone pairs on the central oxygen atom. What's the structure of an F2O molecule? Is this compound polar or non-polar? Question 1 options: A) Bent or angular, polar B) Trigonal planar, polar C) Bent or angular, non-polar D) Trigonal planar, non-polar

Answers

Answer:  A) Bent or angular, polar

Explanation:

The central atom oxygen has two lone pairs and two bond pairs in [tex]OF_2[/tex]. The number of electron pairs are 4,  that means the hybridization will be [tex]sp^3[/tex] and the electronic geometry of the molecule will be tetrahedral. But as there are two lone pair of atoms around the central oxygen atom, repulsion between lone and bond pair of electrons is more and hence the molecular geometry will be bent shape.

The compound [tex]OF_2[/tex] is polar as the net dipole moment of oxygen - fluoride bonds do not cancel each other out.

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:

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