you weigh out 43.9 g of potassium (K). How many moles of potassium did you weigh? How many atoms?

Answers

Answer 1

Answer:

1.12 moles of potassium

6.76x10²³ atoms of potassium

Explanation:

In order to convert g of potassium to moles, we need to use its molar mass (which we can find via the periodic table):

Molar Mass of K = 39.09 g/mol43.9 g K ÷ 39.09 g/mol = 1.12 mol K

Then, to convert moles into atoms, we use Avogadro's number (6.023x10²³ atoms per mole):

1.12 mol K * 6.023x10²³[tex]\frac{atoms}{mol}[/tex] = 6.76x10²³ K atoms

Related Questions

How are the three intermolecular forces related?

Answers

Explanation:

Intermolecular forces are electrostatic in nature and include van der Waals forces and hydrogen bonds. ... The three major types of intermolecular interactions are dipole–dipole interactions, London dispersion forces (these two are often referred to collectively as van der Waals forces), and hydrogen bonds.May 20, 2018

which event would most likely lead to a thunderstorm giving brainliest

Answers

Answer:

A

Explanation:

Took at test on this and my teacher said it was right, hopefully I remembered right, also I answered ur other question like this I think lol

can someone help me with my chemistry on my page/account?

Answers

Answer:

Yes

Explanation:

Text me on here

How many moles are in 3.4 x 10-7 grams of Silicon dioxide, SiO2?

Answers

Answer:

Number of moles = 0.057 × 10⁻⁷  mol

Explanation:

Given data:

Mass of SiO₂ = 3.4 × 10⁻⁷ g

Number of moles = ?

Solution:

Number of moles = mass/molar mass

Molar mass of SiO₂ = 60 g/mol

by putting values,

Number of moles =  3.4 × 10⁻⁷ g / 60 g/mol

Number of moles = 0.057 × 10⁻⁷  mol

Name one way that the scientific community has honored Mendeleev’s contribution to science.

Answers

Answer:

Mendeleev's greatest contribution to science is certainly the Periodic Table of Elements, which says the properties of basic elements repeat periodically when they are arranged by their atomic number. He made the discovery in 1869 during his work on the award-winning textbook on chemistry basics.

Inventions: Periodic table, Pyrocollodion

Explanation:

*Hope this helps*

Answer:

Mendeleev's greatest contribution to science is certainly the Periodic Table of Elements, which says the properties of basic elements repeat periodically when they are arranged by their atomic number. He made the discovery in 1869 during his work on the award-winning textbook on chemistry basics.

Inventions: Periodic table, Pyrocollodion

Explanation:

Which pair of elements will form a covalent bond? A. Aluminium and Chlorine B. Carbon and Sulfur C. Lithium and Oxygen D. Potassium and Chlorine

Answers

Explanation:

Aluminum and chlorine form covalent bond.

Therefore,

Option A is correct✔

Which phrase describes one type of freshwater wetland?
2
acidic areas found in northern climates
reservoirs created by dams at the end of rivers
areas of high elevation that feed into river systems
small streams that flow into larger streams and wetlands

Answers

Answer:

The correct answer is D

Explanation:

Wetlands are environments that are either submerged under water or are frequently wet. Marshes, swamps, bogs, and fens are examples of freshwater wetlands. Here small streams flow into larger streams and wetlands. The correct option is D.

Ecosystems in freshwater wetlands are impacted by transient or ongoing flooding. They are essential habitats for fauna (including migratory species), play a significant role in the regulation of water flow and water quality to entire catchments, and offer shelter for fauna during droughts.

In tropical and subtropical areas, mangrove swamps are coastal wetlands. In brackish to saline tidal waters, they are distinguished by halophytic (salt-loving) trees, shrubs, and other plants.

Thus the correct option is D.

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Which statement is true about copper and salt?

Answers

Well there aren’t any statements but, Salt and Copper are pure substances they aren't a part of a mixture on their own I hope this helps

Which electron dot diagram represents H2?

Answers

Answer:

H:H

Explanation:

Based on the chemical equation, use the drop-down menu to choose the coefficients that will balance the chemical equation:

(
)BaO2 + (
)H2SO4 → (
)H2O2 + (
)BaSO4

Answers

Answer:

1

1

1

1

Explanation:

the equation is balancing

why is it important to prepare for disaster? what are the things you need to prepare?​

Answers

Explanation:

The reason why it is important to prepare for an disaster is because Being prepared can reduce fear, anxiety, and losses that accompany disasters. People also can reduce the impact of disasters (flood proofing, elevating a home or moving a home out of one's harm's way, and securing items that could shake loose in an earthquake) and sometimes avoid the danger completely.

The things you need to prepare for an disaster is

WaterFoodClothing Money if neededFlash lightBatteriesFirst aid kitYou can even need an radio( to keep updated).

Spheres of Earth Assignment Active Analyzing Sphere Interactions Explain how Earth's spheres may be affected by the droughts brought on by El Niño. Sometimes, the surface of the Pacific Ocean warms up, causing changes in the weather in some areas. This phenomenon is called El Niño. El Niño causes the amount of rainfall in some parts of the United States and South America to increase. It also causes droughts to occur in Southeast Asia and Australia. Droughts occur when an area receives less rain than it normally does over a certain period.


help me on this question please. it is 7th grade science​

Answers


During El Niño, changes in wind and ocean current patterns result in warm waters stretching across the whole Pacific Ocean. This extra heating causes changes in wind patterns, which causes atmosphere to react and change all the way from the ground to the edge of space around Earth.

A typical home instant pot has an internal volume of 6.5 Liters. If the steam inside an instant pot with an internal pressure of 191.0 kPa and a temperature of 750.0 K was released into the atmosphere at 101.3 kPa and 298K, what volume with the steam occupy in the atmosphere?

Answers

Answer: V2 = 4.8696 L is the volume occupied by the steam in the atmosphere

We can use the combined gas law to solve this problem.

Combined gas law: P1 V1 / T1 = P2 V2 / T2

(191.0 kPa)(6.5 L) / (750.0 K) = (101.3 kPa)(V2) / (298 K)

Now we solve for V2;

1241.5 / 750 = 101.3 / 298

Now we cross-multiply;

369967 = 75975x

Divide by 75975 on each side;

369967 / 75975 = 75975x / 75975

Round our answer to sig figs;

x (aka V2) = 4.8696 L is the volume occupied by the steam in the atmosphere

1) How many moles are in 4.0x10^24 atoms?

Answers

Answer:

6.64 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{4 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 6.644518...[/tex]

We have the final answer as

6.64 moles

Hope this helps you

How many moles are present in 2.126 g of H2O2 ?

Answers

Answer:

molecular weight of H2O2 or grams. This compound is also known as Hydrogen Peroxide. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles H2O2, or 34.01468 grams.

1 grams H2O2 is equal to 0.029399071224542 mole.

1 grams H2O2 to mol = 0.0294 mol

10 grams H2O2 to mol = 0.29399 mol

20 grams H2O2 to mol = 0.58798 mol

30 grams H2O2 to mol = 0.88197 mol

40 grams H2O2 to mol = 1.17596 mol

50 grams H2O2 to mol = 1.46995 mol

100 grams H2O2 to mol = 2.93991 mol

200 grams H2O2 to mol = 5.87981 mol

There are 0.0625mol in 2.126 g of H2O2.

HOW TO CALCULATE MOLES:

The number of moles of a substance can be calculated by dividing the mass of the substance by its molar mass. That is;

no. of moles (mol) = mass (g) ÷ molar mass (g/mol)

According to this question, 2.126 g of H2O2 were given. The number of moles of H2O2 can be calculated as follows:

Molar mass of H2O2 = 1(2) + 16(2)

= 2 + 32

= 34g/mol

no. of moles = 2.126g ÷ 34g/mol

no. of moles = 0.0625mol

Therefore, there are 0.0625mol in 2.126 g of H2O2..

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17. What is the correct empirical formula for H4C408?
A
H2C204
B HCO2
C
HCO4
D
H2C202

Answers

Answer:

B

Explanation:

by simlfying it you get HCO2

Molecular orbital diagram for Fe.

Answers

ANSWER;

1s22s22p63s23p63d64s2

EXPLANATION;

Molecular orbital diagram for Fe.

In writing the electron configuration for Iron the first two electrons will go in the 1s orbital. Since 1s can only hold two electrons the next 2 electrons for Iron go in the 2s orbital. The next six electrons will go in the 2p orbital. The p orbital can hold up to six electrons. We'll put six in the 2p orbital and then put the next two electrons in the 3s. Since the 3s if now full we'll move to the 3p where we'll place the next six electrons. We now shift to the 4s orbital where we place the remaining two electrons. After the 4s is full we put the remaining six electrons in the 3d orbital and end with 3d6.

Therefore the Iron electron configuration will be 1s22s22p63s23p64s23d6.

Note that when writing the electron configuration for an atom like Fe, the 3d is usually written before the 4s. Both of the configurations have the correct numbers of electrons in each orbital, it is just a matter of how the electronic configuration notation is written

Therefore we have 1s22s22p63s23p63d64s2

How is the kinetic energy of the particles of a substance affected during a phase change?
A.) Kinetic energy increases during exothermic changes and decreases during endothermic changes.
B.) Kinetic energy decreases during exothermic changes and increases during endothermic changes.
C.) Kinetic energy does not change, but the potential energy does.
D.) Kinetic energy changes in the opposite way that the potential energy changes.

Answers

Answer: A. Kinetic energy increases during exothermic changes and decreases during endothermic changes

Explanation: During an exothermic change potential energy is converted to kinetic energy. I hope this is correct. :)

Answer:

C

Explanation:

The balanced equation for the syntheis of Iron (I) oxide is below:

If 5.4 moles of Fe react with 4.7 moles of O2, what is the maximum amount of Fe2O3 (in moles) that can be produced? What is the limiting reactant?

a
3.1 moles of Fe2O3 is the maximum amount that can be produced. Oxygen is the limiting reactant.

b
2.7 moles of Fe2O3 is the maximum amount that can be produced. Iron is the limiting reactant.

c
7.1 moles of Fe2O3 is the maximum amount that can be produced. Oxygen is the limiting reactant.

d
10.8 moles of Fe2O3 is the maximum amount that can be produced. Iron is the limiting reactant.

Answers

Answer:

Option B. 2.7 moles of Fe2O3 is the maximum amount that can be produced. Iron is the limiting reactant.

Explanation:

The balanced equation for the reaction is given below:

4Fe + 3O2 —> 2Fe2O3

From the balanced equation above,

4 moles of Fe reacted with 3 moles of O2 to produce 2 moles of Fe2O3.

Next, we shall determine the limiting reactant. This can be obtained as follow:

From the balanced equation above,

4 moles of Fe reacted with 3 moles of O2.

Therefore, 5.4 moles of Fe will react with = (5.4 × 3)/4 = 4.05 moles of O2.

Thus, we can see that only 4.05 moles out of 4.7 moles of O2 given is needed to react completely with 5.4 moles Fe. Therefore, Fe is the limiting reactant and O2 is the excess reactant.

Finally, we shall determine the maximum amount of Fe2O3 produced from the reaction.

In this case, the limiting reactant will be use because it will produce the maximum amount of Fe2O3 as all of it is used up in the reaction.

The limiting reactant is Fe and the maximum amount of Fe2O3 produced can be obtained as follow:

From the balanced equation above,

4 moles of Fe reacted to produce 2 moles of Fe2O3.

Therefore, 5.4 moles of Fe will react to produce = (5.4 × 2)/4 = 2.7 moles of Fe2O3.

Summary:

Limiting reactant => iron (Fe)

Maximum amount of Fe2O3 produce = 2.7 moles

find the number of hydrogen atoms of an alkyl group with 2 carbon atoms if n=2​

Answers

Answer:

5

Explanation:

An alkyl group is a functional group that contains only hydrogen and carbon atoms. It has the general formula: CnH2n+1.

Since n=2, plug it into the formula.

C2H2(2)+1

=

C₂H₅

Hope that helps.

fill in the blank please

amino acids as _____ are to words

Answers

Answer:

Sentences are where there is a beginning and an end of a section of a paragraph. Letters are individual parts of sentences.

The answer that would make the MOST sense would be SENTENCES

A saturated hydrocarbon having molecular formula CnH2n+2 diffuses through a porous membrane twice as fast as sulphur dioxide. Calculate the volume occupied by the hydrocarbon at27°C and 2atm ?
Help me fast !​

Answers

Answer:

12.3 L

Explanation:

Now we have that the rate of diffusion of the saturated hydrocarbon is R1

Rate of diffusion of sulphur dioxide is R2

Molar mass of hydrocarbon is M1

Molar mass of sulphur dioxide is 64 gmol-1

From Graham's law;

R1/R2 = √64/M1

2/1 =√64/M1

(2/1)^2 = (√64/M1)^2

4/1 = 64/M1

4M1 =64

M1 = 16

To obtain the number of moles of the gas;

(n*12) + (2n + 2) 1 = 16

12n + 2n + 2 = 16

14n + 2 = 16

14n = 16 - 2

n = 14/14

n = 1

Hence the hydrocarbon is CH4

Volume occupied by CH4 at STP = 22.4 L

Hence;

P1 = 1 atm

T1 = 273 K

V1 = 22.4 L

T2 = 300 K

P2 = 2 atm

V2 = ?

P1V1/T1 = P2V2/T2

P1V1T2 = P2V2T1

V2 = P1V1T2/P2T1

V2 = 1 * 22.4 * 300/2 * 273

V2 = 12.3 L

The volume occupied by the hydrocarbon at 27 °C and 2 atm is 12.31 L

Let the hydrocarbon be initially at standard temperature and pressure (STP)

Thus, we can obtain the new volume of the hydrocarbon by using the combined gas equation as illustrated below:

Initial volume (V₁) = STP = 22.4 L Initial pressure (P₁) = STP = 1 atmInitial temperature (T₁) = STP = 273 KFinal temperature (T₂) = 27 °C = 27 + 273 = 300 KFinal pressure (P₂) = 2 atmFinal volume (V₂) =?

P₁V₁ / T₁ = P₂V₂ / T₂

(1 × 22.4) / 273 = (2 × V₂) / 300

22.4 / 273 = (2 × V₂) / 300

Cross multiply

273 × 2 × V₂ = 22.4 × 300

546 × V₂ = 6720

Divide both side by 546

V₂ = 6720 / 546

V₂ = 12.31 L

Thus, the volume occupied by the hydrocarbon at 27 °C and 2 atm is 12.31 L

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Which of these sentences probably comes from a work of classic literature?) PLEASE HELP ILL GIVE YOU BRAINLEIST!


A. The greedy man was harsh as winter, and had never done a generous deed in his long life; he was a hermit.
B. The man who refused to share with those in need had never felt the warmth that comes from giving.
C. The most selfish man in town was one who lived alone and never had visitors of any sort, except maybe lawyers.
D. The miser was hard and sharp as flint, from which no steel had ever struck out generous fire; he was as solitary as an oyster.

Answers

The sentences that probably comes from a work of classic literature are:

The most selfish man in town was one who lived alone and never had visitors of any sort, except maybe lawyers. The miser was hard and sharp as flint, from which no steel had ever struck out generous fire; he was as solitary as an oyster.

What types of books are regarded as classics?

The great literary works of Greek, Roman, and other prehistoric civilizations are referred to as classical literature. Classical literature includes the writings of Homer, Ovid, and Sophocles. The phrase isn't just applicable to books. It can also incorporate other types of writing, such as epic, lyric, tragedy, comedy, and pastoral.

Classical literature enables us to take a profound plunge into the lives, worldviews, and mindsets of individuals we have never met, to travel to unfamiliar settings, and to comprehend eras we will never be able to experience ourselves.

Therefore, option C and D are correct.

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10
The reaction in which ammonia is formed is N2(g) + 3H2(g) + 2NH3(). At equilibrium, a
1-L flask contains 0.15 mol H. 0.25 mol N, and 0.10 mol NH. Calculate K., for the reaction.
11.85
23.8
25.0
16

Answers

The equilibrium constant (K) : 11.85

Further explanation

Given

Reaction

N₂(g) + 3H₂(g) ⇒ 2NH₃(g)

Required

K(equilibrium constant)

Solution

The equilibrium constant (K) is the value of the concentration product in the equilibrium

The equilibrium constant based on concentration (K) in a reaction  

pA + qB -----> mC + nD  

[tex]\tt K=\dfrac{[C]^m[D]^n}{[A]^p[B]^q}[/tex]

For the reaction above :

[tex]\tt K=\dfrac{[NH_3]^2}{[N_2][H_2]^3}\\\\K=\dfrac{0.1^2}{0.25\times 0.15^3}\\\\K=11.85[/tex]

Which of the following are examples of QUALITATIVE data? (seiect all that apply)

None these is qualitative data

The sound of a person's voice

The weight of person

The hair color of a person

The body temperature of a person

Answers

Answer:

The hair color of a person

Explanation:

The correct answer would be the hair color of a person.

Qualitative data are data that cannot be measured with any instrument but can only be used to characterize. Unlike quantitative data, these kinds of data can only be observed and recorded but cannot be assigned numerical values, except if coded.

The sound of a person's voice can be quantitative on one hand and qualitative on the other. The intensity of a sound can be measured using a decibel meter and quantitatively assigned a figure, whereas, the quality of the sound can only be characterized and not measured.

Both the weight and the body temperature of a person can be measured using a weighing balance and a thermometer respectively and hence, are considered to be quantitative data when collected.

The color of the hair of a person cannot be measured but can only be observed and characterized. Hence, hair color data constitute qualitative data.

Answer:

hair color

Explanation:

about how much of the visible side of the moon is lit up during a full moon?
A. Three fourths
B. One fourth
C. None of it
D. All of it

Answers

Answer:

D

Explanation:

i learned this in elementary

If 35.0 g of aluminum changes temperature by 84.0℃, how much heat was absorbed? specific heat of Al = 0.910 J/g℃

Answers

40567⁰ kkkkkkkkkkkkkkkkkkkkkkmeow

Explanation:

cuz I got a 100

you have a friend who is using a recipe for flat from american cookbook you notice that he set your over temperature at 175F° what you advise him to do?​

Answers

Answer:

I will give them advice, that do the power of flame low....

Explanation:

thanks.

4.which is a product of the process shown above?
a. carbon dioxide
b. sugar
c. sunlight
d. water

5.where does the energy that drives this process come from?
a. oxygen
b. sugar
c. sunlight
d. water

Answers

Answer:

4. b 5.C

Explanation:

Photosynthesis makes sugar for plants and sunlight is the energy used to convert CO2 and water into glucose

The product of the process of photosynthesis is sugar and the energy to dive the process of photosynthesis comes from sunlight.

What is photosynthesis?

Photosynthesis is defined as a process by which plants and other photosynthetic organisms convert the light energy in to chemical energy  through the process of cellular respiration.

Some of the energy which is converted  is stored in molecules of carbohydrates like sugar and starches  which are made up of from carbon dioxide and water . Photosynthetic organisms which can perform photosynthesis  are algae and cyanobacteria. Photosynthesis is largely responsible for producing and maintaining the content of oxygen in earth's atmosphere.

The process begins with proteins absorbing light energy  which are called reaction centers and contain a green pigment which is called chlorophyll . In plants ,these pigments are present inside organelles called chloroplasts while in bacteria they are present in plasma membrane.

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In the reaction C + O2 → CO2, 18 g of carbon react with oxygen to produce 72 g of carbon dioxide. What mass of oxygen would be needed in the reaction?

18 g
54 g
72 g
90 g

Answers

Answer:

54g of O2 reacted in the reaction

Answer:

54g

Explanation:

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