Calculate the number of atoms in a 3.31 x 10 g sample of lithium.
g

Answers

Answer 1

Explanation:

atomic mass of Li = 7 amu

so we know that there are about (33.1)/7 = 0.47 mol

Multiply this by 6.02 * 10^23 particles per mol, and we get about 2.83 * 10^23 particles


Related Questions

Carbon substances can have very different properties because...
O A. carbon is almost never found as an element
O B. carbon atoms are very unstable
O c. carbon atoms can be arranged in different ways
O D. carbon atoms are not attracted to each other

Answers

Answer:

Calculate the volume (in mL) of the 1.356 M stock NaOH solution needed to prepare 250.0 mL ... Glucose (molar mass=180.16 g/mol) is a simple, soluble sugar ... g of glucose in enough water to make 500.0 mL of solution. • Step 2: Transfer 18.6 mL of the

Explanation:

If a 100. -g sample of a hydrated compound contains 37.07-g sodium, 48.39-g carbonate and 14.54-g water, find the empirical formula

Answers

he required empirical formula based on the data provided is Na2CO3.H2O.

What is empirical formula?

The term empirical formula refers to the formula of a compound which shows the ratio of each specie present.

We have the following;

Mass of sodium = 37.07-g

Mass of carbonate = 48.39 g

Mass of water = 14.54-g

Number of moles of sodium = 37.07-g/23 g/mol = 2 moles

Number of moles of carbonate = 48.39 g/61 g/mol = 1 mole

Number of moles of water = 14.54/18 g/mol = 1 mole

The mole ratio is 2 : 1: 1

Hence, the required empirical formula is Na2CO3.H2O

Learn more about empirical formula : https://brainly.com/question/11588623


What is the relationship between temperature and kinetic energy?

Answers

Answer:

substance is related to the average kinetic energy of the particles of that substance

Explanation:

Answer:

As stated in the kinetic-molecular theory, the temperature of a substance is related to the average kinetic energy of the particles of that substance. When a substance is heated, some of the absorbed energy is stored within the particles, while some of the energy increases the motion of the particles.

Explanation:

hope it will help you have a great day bye and Mark brainlist if the answer is correct

[tex]kai6417[/tex]

#carry on learning

How many miles of mgs2o3 are in 199g

Answers

Answer:

1.83 moles

Explanation:

1.83 moles

hi everyone, I am getting stuck in this question can you tell me it please ,what are the property's of a metal and a non-metal​

Answers

Answer:

Explanation:

Properties of Metal

1. Metals are ductile. ...

2. Metals are a good conductor of heat and electricity.

3. Metals have high tensile strength. .

4. Metals are sonorous.
5. Metals are hard.


Properties of non metal

1. High ionization energies.

2. High electronegativities.

3. Poor thermal conductors.

4. Poor electrical conductors.

5. Brittle solids—not malleable or ductile.

6. Little or no metallic luster.

7. Gain electrons easily.

Given that for Fe2O3 (s) the standard enthalpy of formation is −824.2 kJ/mol and the enthalpy of reaction is −851.5 kJ/mol, what is the enthalpy of formation for Al2O3 (s)?

Answers

This problem is providing us with the enthalpy of formation of Fe2O3 (s) and the enthalpy of reaction when it reacts with Al to form Al2O3 (s) and Fe. Thus, the enthalpy of formation of Al2O3 (s) is required and found to be -1675.7 kJ/mol as follows.

Enthalpy of reaction.

In chemistry, the heat involved in a chemical process can be quantified via the difference in the overall enthalpy of products minus that of reactants:

[tex]\Delta H_r=\Delta H_{products}-\Delta H_{reactants}[/tex]

Now, with the given reaction:

[tex]Fe_2O_3 (s) + 2 Al (s) \rightarrow 2 Fe (s) + Al_2O_3 (s)[/tex]

One can see both Al and Fe have zero as their enthalpies of formation for they are elements. In such a way, one can rearrange the previous formula as:

[tex]\Delta H_r=\Delta H_{Al_2O_3}-\Delta H_{Fe_2O_3}[/tex]

And hence plug in the given energies in order to find the required:

[tex]-851.5kJ/mol=\Delta H_{Al_2O_3}-(-824.2kJ/mol)\\\\\Delta H_{Al_2O_3}=-851.5kJ/mol+(-824.2kJ/mol)\\\\\Delta H_{Al_2O_3}=-1675.7kJ/mol[/tex]

Learn more about enthalpy of reaction: https://brainly.com/question/8055290

It is a full moon on Jan 15th. How many days will it be until the next full moon?

Answers

Answer:

29.5 days

Explanation:

How often does a full Moon occur? A full Moon happens roughly every 29.5 days. This is the length of time it takes for the Moon to go through one whole lunar phase cycle.

Calculate the mass of aluminium oxide which contains double the number of oxygen atoms in 192 g of oxygen gas.​

Answers

Answer:

648

Explanation:

what you're going to do your first is to convert the 192g to number of atoms

firstly you are going to convert 192 to moles using the formula reacting mass all over molar mass, into it that you're going to get 12 as your answer, you Dey multiply the 12 to avocados constant

in doing that you have I've gotten the number of atoms present in 192 g of oxygen

In the reaction A+B - C+D, if element B is in excess, then-

Answers

Answer:

Explanation:

Determining the Limiting Reagent

One reactant (A) is chosen, and the balanced chemical equation is used to determine the amount of the other reactant (B) necessary to react with A. If the amount of B actually present exceeds the amount required, then B is in excess, and A is the limiting reagent.

An engine cylinder contains 175 mL of gas at a pressure of 1.0 atm. As the engine runs, it compresses the cylinder, reducing the volume of the gas to 15 mL. What is the new pressure of the gas at this volume?

Answers

This problem is providing the initial volume and pressure of a gas in an engine cylinder and asks for the final pressure once the volume of the gas has decreased due to a compression. At the end, the result turns out to be 11.7 atm.

Boyle's law

In chemistry, gas laws allow us to calculate pressure, volume, temperature or moles depending on a specified change and based on the concept and equation of the ideal gas, which derives the well-known gas laws; Boyle's, Charles', Gay-Lussac's and Avogadro's.

Thus, since this problem provides initial and final volume and initial pressure for us to calculate the final pressure, we understand we need to apply the Boyle's law as a directly proportional relationship between these two:

[tex]P_1V_1=P_2V_2[/tex]

Thus, we solve for the final pressure, P2, to get:

[tex]P_2=\frac{P_1V_1}{V_2}=\frac{1.0atm*175mL}{15mL}\\ \\ P_2=11.7atm[/tex]

Learn more about ideal gases: brainly.com/question/8711877

i’m trying to figure out how to convert 6 moles KCL to particles.

Answers

Answer:

How many moles KCl in 1 grams? The answer is 0.013413582325

1 mole is equal to 1 moles KCl, or 74.5513 grams.

447.3078 is the answer

Explanation:

~Cornasha_Weeb

can you please help me out with this​

Answers

Answer:

Explanation:uum i cant see anything but yeah I think its c

What’s (CH3)2CHCCCH3.

Answers

Answer:

4-methly-2-pentyne

Explanation:

What is the mass of 750 atoms of Nitrogen?

Answers

Answer:

53.545803079954496

Explanation:

Brainliest pls

Add the phrase that completes the thought in the underline sentence. Lin never forget how it felt.

Answers

Lin never forgot how it felt to be left out

Answer:

to be left out

Explanation:

Lin never forgot how it felt to be left out.

In the paragraph given, we see Lin being left out of a play. She wanted to be Dorthy but was told she couldn't. This led to feelings of being left out.

Have a nice day!

     I hope this is what you are looking for, but if not - comment! I will edit and update my answer accordingly.

- Heather

How would I Determine the number of moles in 3.51 x 10^23 formula units of CaCl2

Answers

Answer:

by using this formula you will get it

Explanation:

number of mole = number of particles÷ Avogadro's number

n=3.51×10^23÷ 6.02×10^23

n = 0.58 moles

scientific notation mean

Answers

PLS GIVE ME A THANKS OR STAR I REALLY NEED POINTS SO THAT I CAN ASK A QUESTION i hope my answer helped you

Scientific notation is a way of writing very large or very small numbers.

a widely used floating-point system in which numbers are expressed as products consisting of a number between 1 and 10 multiplied by an appropriate power of 10 (as in 1.591 × 10−20)

How many iron atoms are in 7.890 g of iron?

Answers

Answer:

mole = reactingmass = 7.890= 0.142 mol

molarmass 55.8

atoms = mol × alvagadro constant

0.142 × 6.02 × 10^23

=8.5484 × 10^22 Atoms

Fill in the reaction type and predicted products for:

Fe3O4 (s) → ??

Type in the IUPAC name or formula for each product.
Write subscripts as normal numbers.
If there is no second product, type "nothing".
The reaction type is
Question Blank 1 of 3

.
The correct products are:
Question Blank 2 of 3

and
Question Blank 3 of 3

Answers

Needs more explaining

ONE MINUTE PLSSSS!!! WILL GIVE BRAINLIEST
Carbon has an atomic number of 6 and an atomic mass of 12. If it is a neutral atom then it has 6 protons, ______ neutrons, and _____ electrons.

13 neutrons and 6 electrons
6 neutrons and 6 electrons
7 neutrons and 7 electrons
12 neutrons and 12 electrons

100 POINTS!!!!!!! <3

Answers

Answer:

6 neutrons and 6 electrons

Explanation:

I got it right ;) good luck

What is the mass in grams of 3.01 X 1023 atoms of the element chlorine, Cl? (Please show step by step)!

Answers

Answer: the mass of 3.01 atoms of chlorine is 35.46/2 = 17.73 g.

Explanation: hope its correct

step by step: molar mass: (2 x 35.46) g/mol = 70.92 g/mol

1 mole chlorine = 6.02 x 10^23 molecules of chlorine.

Mass of 6.02 x 10^23 molecules chlorine = 70.92 g

Mass of 3.01 x 10^23 molecules chlorine = 70.92 x(3.01 x 10^23)/(6.02 x 10^23)g

= 35.46 g

Which chemicals are only present at point “x”?

Answers

Is 5 check my pin to view

There are 3 reactions of Calcium Carbonate, CaCO₃, that can be formed in this particular problem:

Reaction 1: Calculate the ΔH₁
Reaction 2: ΔH₂ = -635.1 kJ
Reaction 3: ΔH₃ = 178.3 kJ

Answers

ΔH₁ = ΔH₂ - ΔH₃

ΔH₁ = -635.1-(178.3) KJ

ΔH₁ = -813.4 KJ

what is the conversion factor for in^3 to cm^3

Answers

You multiply by 16.3871

An atom has atomic number 5 and mass number 11. How many neutrons does the atom have?
A- 5
B- 6
C- 10
D- 11

Answers

Answer:

B

Explanation:

neutrons + atomic number/proton/electron for a neutral atom = mass number

e.g

mass number of Chlorine 35.5

proton number 17

neutron number will be 35.5-17 = 18.5

Therefore.....

your question deduced says

atomic number is 5

mass number is 11

neutron number is however mass number minus atomic number 11-5 =6

Fill in the reaction type and predicted products for:

H2SO3 (aq) + Mg(OH)2 (aq) → ??

Type in the IUPAC name or formula for each product.
Write subscripts as normal numbers.
If there is no second product, type "nothing".
The reaction type is
Question Blank 1 of 3

.
The correct products are:
Question Blank 2 of 3

and
Question Blank 3 of 3

Answers

IUPAC = no answer sorry but subscribe are not

A radioactive isotope that can be followed through a chemical reaction or industrial process is called a/an what? (needs answer asap!!!!!)

Answers

a radioactive isotope that can be followed through a chemical reaction or industrial process is called a radiotracer

Identify the following reactions as combination, decomposition, or combustion reactions


C7H8 + 9O2 → 7CO2 + 4H2O ______________

2NaHCO3 → Na2CO3 + H2O + CO2 ___________

CH4 → C + 2H2O ________________

P4O10 + 6H2O → 4H3PO4 ______________

FeSO4 → FeO + SO3 _______________

CaCO3(s) → CO2(g) + CaO(s) _________________

Answers

Answer:

1. combustion

2. decomposition

3. decomposition

4. combination

5. decomposition

6. decomposition

Explanation:

combination of a reaction is when 2 more or elements/ compounds combine to form a compound. example: (A+B→AB)

decomposition of a reaction is when a chemical breakdown. example: (AB→A+B)

a combustion reaction is when an element/ compound reacts with oxygen to form the product of water and carbon dioxide.

example: ( [tex]C_{x}[/tex] [tex]H_{y}[/tex] + [tex]O_{2}[/tex] → [tex]H_{2}[/tex]O + [tex]CO_{2}[/tex] )

It took Lily 7 seconds to ride her bike 35 m to the end of the block what was her speed

Answers

Answer:

5

35 divided by 7 = 5

Explanation:

Hope this helps!!

Liyah

the inner part of the ovary that contains an egg is the ovule
true or false

Answers

Answer:

The answer is true

Explanation:

the ovary is a tubular structure and contains ovules

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