The chemical equation below shows the burning of magnesium (Mg) with oxygen (O2) to form magnesium oxide (MgO). 2Mg O2 Right arrow. 2MgO The molar mass of O2 is 32. 0 g/mol. What mass, in grams, of O2 is required to react completely with 4. 00 mol of Mg? 2. 00 64. 0 128 256.

Answers

Answer 1

Answer:

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Answer 2

The mass of oxygen required for complete utilization of 4 mol of Mg has been 64 g. Thus, option B is correct.

The balanced equation for the reaction has been:

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

From the balanced chemical equation, for complete utilization of 2 moles of Mg, 1 moles of oxygen has been used.

The given moles of Mg has been 4 mol. The moles of oxygen required can be given as:

[tex]\rm 2\;mol\;Mg=1\;mol\;O_2\\4\;mol\;Mg=2\;mol\;O_2[/tex]

Thus, the moles of oxygen required has been 2 mol for complete utilization of 4 mol Mg.

The mass from moles can be calculated as:

[tex]\rm Mass=Moles\;\times\;molecular\;mass[/tex]

The molecular mass of oxygen has been 32 g/mol.

The mass of oxygen has been:

[tex]\rm Mass=2\;\times\;32\;g\\Mass=64\;g[/tex]

The mass of oxygen required for complete utilization of 4 mol of Mg has been 64 g. Thus, option B is correct.

For more information about the chemical equation,refer to the link:

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Related Questions

A 100 watt solar power panel usually costs $146 they are on sale for 0.75 of the regular price what is the sale price

Answers

Answer: $109.5
Multiply $146 (original price) by 0.75 (the percentage) and there’s your answer!

how do you find a mole (i need an example) i hate chem pls help

Answers

Answer:

I'm pretty sure its just the mass of the sample divided by the molar mass

for example if I had like 7g of carbon and wanted to find the moles, I would divide the mass I have (7g) by the molar mass (the atomic mass value on your periodic table, in this case for carbon it would be 14g)

moles = [tex]\frac{mass}{molarmass} = \frac{7}{14} = 0.5\ moles[/tex]

Hope this helped


c) A substance has a high melting point and conducts electricity. What type of structure does it have

Answers

Answer:

Metallic structure

Explanation:

They have a high melting point due to the strong forces of attraction between the positive ions (cations) and the delocalised electrons. Moreover, they conduct electricity due to the sea of delocalised electrons.

[Extra: It could be an ionic compound since they also have a high melting point, however they only conduct electricity in liquid or aqeouus state.]

Why does a light bulb turn in When you flip the switch to on?

Answers

Explanation:

Flipping a light switch to turn on a light means that the circuit with the light is being closed. When the switch is flipped the opposite way, to turn the light off, the circuit is being opened.

Answer:

You now have an open circuit

Explanation:

The circuit is closed when the switch is flipped the other way to turn off the light.

What eats a FawnsFoot Mussel?

Answers

Answer:

I have no Idea please give more context to your question.

Explanation:

Is sweat a chemical? I am curious to know! NO LINKS OR TROLLS

Answers

Answer:

no

Explanation:

stop troll hate

Please Help
Predict the nature of the indicated covalent
bond. Polar or Non polar

Answers

Answer:

Nonpolar

Explanation:

give me a answer!!!!!!!!!!!!!!!​

Answers

Answer: i did the ones i knew

1. thorns

2. smell

6. long roots

8. smell

9. thorns

Explanation:

How many total atoms does 3Na2S2O3 have

Answers

Answer:

21

Explanation:

Let us count the number of individual atoms for Na2S2O3 (the compound name):

Na: 2

S: 2

O: 3

This brings us to a total of 7 atoms for one molecule of sodium thiosulfate. For three of these compounds, we get 3*7=21

The material used as a biological sensor is one dimension of 20 mm, the other Are in nanometers ​

Answers

Answer: 20 , 40

I want know the answer now !

which is the best reason given to explain why metals make good electrical conductors?

Answers

Answer: Metals are an excellent conductor of electricity and heat because the atoms in the metals form a matrix through which outer electrons can move freely.

Explanation:

What is the wavelength of the above wave?

Answers

Answer:

well what above wave?? do you have a picture

Explanation:

OSSIBLES2
Mulchem with what would happen we have
Langs
Besi
III
Sko
Het
* Vedhere very little proteson against uyiri, Senal amage, ara pathogens the viruses are busers
35 Wd be able to be one to our body and remove carbon diote on our biker
45 Wd be able to gicky react to save ourselves from daneous stations
3 Wed he wable to crostate and deliver orygen ad carbon dioxide throughout our body
1
2
2
4
5
Next >

Answers

i’m not sure i’m very sorry

If the pressure, volume, and temperature of a gas are known, which can most likely be found by using the ideal gas law?
the molar amount of the gas
the partial pressure of the gas
the standard temperature and pressure
the molar mass

Answers

the correct answer should be: the molar amount of the gas.

Answer:

the molar amount of the gas.

Explanation:

Research the future of energy production. What improvements to (or new methods of) electrical energy production are scientists currently developing? How will they improve on present methods of energy production (what makes these new methods better than the old)? What are the cons of these improvements?

Answers

Answer:

Fossil fuels like coal, oil and natural gas supply 80 percent of the world’s energy to warm homes, charge devices and power transportation. They are also the primary human source of greenhouse gas emissions. Stanford scientists broadly agree that curtailing our use of fossil fuels would have significant benefits like improving health and reducing the number and severity of natural disasters, but it’s not yet clear what can replace them.

Explanation:

How many molecules are in 1.3 moles of water?​

Answers

Answer:

7.8286e+23

Explanation:

Use Avogadro's number

which of the following atom could reside in the same group? Explain your answer

Answers

Can you send a picture? or explain further? Atoms of elements that are in the same group have the same number of Valence Electrons.

the valence electrons of metals jump easily to a higher energy orbital when light shines on them then they all fall emiting the excess energy as light which property of metals is explained by this?​

Answers

Answer:

Lustrous

Explanation:

Metals are lustrous which gives them a property of having Shiny surfaces

The valence electrons of metals jump easily to a higher energy orbital when light shines on them then they all fall emitting the excess energy as light show lustrous  property of metals.

What are valence electrons?

Valence electrons are defined as a negatively charged particle that can be shared or transmitted between atoms that is found in the outermost shell of an atom. Valence electrons have a crucial role in determining how an atom will behave. The electrical configurations of elements can be used to find valence electrons. The total number of valence electrons in that element is then determined by counting the number of electrons in the outermost shell.

When newly treated, polished, or broken, a material takes on a bright look and conducts electricity and heat reasonably well. Metals are typically ductile and malleable. These traits are the result of the metallic bond that connects the atoms or molecules of the metal.

Thus, the valence electrons of metals jump easily to a higher energy orbital when light shines on them then they all fall emitting the excess energy as light show lustrous  property of metals.

To learn more about valence electrons, refer to the link below:

https://brainly.com/question/13993867

#SPJ2

the tree is 18 meters long is an example of

Answers

This question is describing a thoroughly opened statement about the length of a three as 18 meters, which in the context of science can be referred to:

- A hypothesis or a result in the scientific method, if one is measuring the length of given objects.

- A measurement, if one is measuring the length of a three or any other object.

In both cases, we can note that the measurement has the following basic structure:

1. A number, defining how large or small the measurement is.

2. A unit, defining the system in which the measurement is reported to the scientific community.

Learn more:

https://brainly.com/question/13501946https://brainly.com/question/733946

What is x?





a
28
b
44
c
224
d
136

Answers

Answer:

Hope answer is right, d=136

A tank of syngas produced by coal gasification contains 60.0% carbon monoxide, 30.0% hydrogen, and 10.0% carbon dioxide. What is the mass of hydrogen (in g) in 1.00 cubic meter of this syngas mixture at 1.00 atm and 25.0 °C? (1 m³ = 1000 L)

Answers

Considering the ideal gas law, the mass of hydrogen is 24.552 grams.

An ideal gas is a theoretical gas that is considered to be composed of randomly moving point particles that do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.

An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of the gases:

P× V = n× R× T

In this case, you know:

P= 1 atmV= 1 m³= 1000 Ln= ?R= 0.082[tex]\frac{atmL}{molK}[/tex]T= 25 °C= 298 °K

Replacing in the ideal gas law:

1 atm× 1000 L = n× 0.082[tex]\frac{atmL}{molK}[/tex]× 298 K

Solving:

[tex]n=\frac{1 atmx1000 L}{0.082 \frac{atmL}{molK}x298 K}[/tex]

n= 40.92 mol

The mol of syngas mixture is 40.92 mol.

Syngas mixture contains 30.0% hydrogen. So, there is a mol fraction of [tex]x_{hydrogen} =[/tex]0.3 . Thus, the mols of hydrogen in syngas mixture is calculated as:

40.92 moles of syngas mixture× 0.3= 12.276 moles of hydrogen

Finally, being the molar mass of hydrogen H₂ 2 [tex]\frac{g}{mole}[/tex], then the mass is:

[tex]12.276 molesx\frac{2 grams}{1 mole}[/tex]= 24.552 grams

In summary, the mass of hydrogen is 24.552 grams.

Learn more about ideal gas law:

https://brainly.com/question/4147359?referrer=searchResults

what is the magnitude of the acceleration that is produced when the brakes of a 2.4 x 10
cubed kg car apply a 3.2 x 10 cubed N force to stop the car

Answers

Answer:

b 1.3 m/s

Explanation:

newton's second law of motion

Which statement is correct about charges?
A.Opposite charges repel
B.Similar charges attract
C.Electrons are positively charged
D.Similar charges repel

Answers

Answer:

A.Opposite charges repel

[tex] \: \: \: \: [/tex]

D.Similar charges repel

correct me if I'm wrong

hope it helps

the boiling point of water at standard pressure is

Answers

Answer:

100 Celsius mostly because water boils at sea level

What type of weathering involves changes in the size or shape of the rock?

A: hydrolysis
B: physical weathering
C: pressure weathering
D: chemical weathering

Answers

Answer:

B

Explanation:

The rock is physically weathered down and decreases in size.

How many atoms are in 80.45g of magnesium

Answers

Answer:

see below

Explanation:

1. 1 mol Mg = 24.31 g = 6.02 *10^23 atoms

     calculate the number of atomsin 80.45g Mg

         Numberof atoms = 6.02*10^23 Mg atoms / 24.31 g * 80.45 g

                                    = 1.99*10^24 atoms

2.1 mol C-12 = 12.01g = 6.02 * 10^23 atoms

    calculate the mass using

                                       = 12.01 g C / 6.02*10^23 atoms * 100 atoms

                                       = 1.99 * 10^-21 g

Answer:

1.9926 * 10 ^24 

Explanation:

Molar Mass - Use Periodic table!

M ( Mg ) = 24.31 g / mole

n = 80.45 g : 24.31 g/mole = 3.31 moles

N a ( Avogadro`s constant ) = 6.02 * 10 ^23

N = Na * n = 6.02 * 10 ^24 * 3.31 = 19.926 * 10 ^23

All atoms of an element are______.

Points: 87

Answers

Answer:

Alike

Explanation:

Prokaryotic and Eukaryotic Cells Booklet

Answers

Answer:

Power Plant = Mitochondria (Mitochondria is the powerhouse of the cell)

City Limits = Cell Membrane (Outer layer of a cell)

City Hall = Nucleus (The nucleus is the control center in a cell)

City Food Processing Plant (Chloroplast process the cells food)

City Plans = Chromosomes (They contain the genetic information about the cell)

Community = Cytoplasm (Mainly process of elimination)

Explanation:

Explanations are in parenthesis

the ability to conduct electricity is a characteristic of metallic bonding. this characteristic is best explained by the presence of ________________.

Answers

Electric current but I’m not sure

What is an example of thermal energy

A) batteries moving a toy
B) riding a bicycle
C) plugging in a tv
D) using an oven to cook

Answers

D because your using heat I’m guessing
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