why fe2o3 is called ferric oxide​

Answer:

vapor pressure of methanol at 12.0C = 75.09 torr

Explanation:

Using Clausius Clapeyron equation

, we have that

ln (P2/P1)= (ΔHvap /R) (1/T1 - 1/T2)

Given

At Normal boiling point,

Temperature T1= 64.6°C = 64.6 + 273 = 337.6 K, Pressure,P1 = 1 atm

Heat of vaporization  = 35.2 kJ/mol

Changing to  J/mol

=35.2 x 1000= 35200 J/mol

Temperature , T2 = 12.0oC = 12 + 273 = 285 K

Using gas constant, R = 8.314 J/mol.K

ln (P2/P1)= -(ΔHvap /R) (1/T1 - 1/T2)

ln (P2/ 1 atm) = (35200 J/mol/ (8.314 J/mol.K) X( 1/337.6 - 1/285)

ln (P2/ 1 atm) =4,233.822 X (0.00296-0.003508)

ln (P2/ 1 atm)  = 4,233.822468  x-0.0005466866

ln (P2/ 1 atm)=  -2.31457

P2 = e^⁻2.31457 x 1 atm

P2=0.098808atm

= 0.098808atm  x760 = 75.09 torr

Answer:

It should contain 32 hydrogen.

Answer:

See explanation

Explanation:

Nucleosynthesis is the process that creates new atomic nuclei from pre-existing ones via nuclear reactions.

A nuclear reaction involves the nucleus of atoms. It means the transformation of one element to another.

In the image attached i have shown the equations representing the nucleosynthesis of O, Ne, Na and Mg.

The nucleosynthesis of O involves the bombardment of C-12 with alpha particles, gamma rays are produced.

The nucleosynthesis of Ne involves the bombardment of O-16 with alpha particles, gamma rays are produced.

The nucleosynthesis of Na involves the bombardment of Ne-20 with alpha particles, protons are produced.

The nucleosynthesis of Mg involves the bombardment of Ne-20 with alpha particles, gamma rays are produced.

Answer:

λ = 0.029×10² m

f = 0.57×10¹⁷ s⁻¹

Explanation:

Given data:

Wavelength of wave = ?

Frequency of wave = 102.7×10⁶ s⁻¹

Solution:

Formula:

Speed of wave = Wavelength  × Frequency

speed of wave = 3×10⁸ m/s

by putting values,

3×10⁸ m/s = λ × 102.7×10⁶ s⁻¹

λ = 3×10⁸ m/s /  102.7×10⁶ s⁻¹

λ = 0.029×10² m

2nd)

Given data:

Wavelength of wave = 5.267 nm (5.267×10⁻⁹ m)

Frequency of wave =  ?

Solution:

Formula:

Speed of wave = Wavelength  × Frequency

speed of wave = 3×10⁸ m/s

by putting values,

3×10⁸ m/s = 5.267×10⁻⁹ m × f

f = 3×10⁸ m/s /  5.267×10⁻⁹ m

f = 0.57×10¹⁷ s⁻¹

Explanation:

A chemical change is a change in which a new kind of substance is produced. Such changes are always accompanied by energy changes.

They are mostly reversible.

Some examples of such reactions are combustion, rusting of iron, precipitation, rancidity of butter, souring of milk.

Answer: The Avagadro constant = 6.022 x 10²³ denotes the no of molecules in one mole of the substance

Explanation:

The theoretical yield (in kilograms) of water produced from this reaction : 0.285 kg

Reaction

2C₁₂H₂₄O₁₁ + 25O₂ → 24CO₂ + 24H₂O

mass of C₁₂H₂₄O₁₁ - isomaltitol = 454 g

mol C₁₂H₂₄O₁₁(MW=344.31 g/mol) :

[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{454}{344.31 g/mol}\\\\mol=1.319[/tex]

mol H₂O based on C₁₂H₂₄O₁₁ as limiting reactant(O₂-oxygen as an excess)

From the equation above, mol ratio of C₁₂H₂₄O₁₁  : H₂O = 2 : 24, so mol H₂O:

[tex]\tt mol~H_2O=\dfrac{24}{2}\times 1.319=15.828[/tex]

then mass H₂O (MW=18 g/mol) :

[tex]\tt mass=mol\times MW\\\\mass=15.828\times 18=284.904~g=0.285~kg[/tex]

Answer:

Add Items to it

Explanation:

Lol I took the test. Sorry If I'm incorrect

Answer:

add items to the box to increase its mass on the self it is on

Explanation: :p

Answer:

A or C.... Any one. If i am wrong let me know!

Answer:

B) 6

Explanation:

Methylcyclopentane consist of 3 types of hydrogen which are 1° (primary), 2° (secondary) and 3° (tertiary) hydrogen atoms. In the chlorination of methylcyclopentane, there are four monochlorinated products possible and two stereoisomers.

Answer:

You are right, it is the Engineer

Explanation:

Answer:

uh A.)? [ZnCI2+H2]? /////////

Answer:

Distance of something it can be any type of distance

The mass of a single bromine molecule, Br₂ is 2.654 x 10⁻²² g.

Bromine is a diatomic element. It has a symbol Br and the atomic number is 35. Bromine is a naturally occurring element which is liquid at room temperature.

Molar mass of Br₂ is 159.808 g/mol. The molar mass of bromine is 79.904 g/mol. In Br₂, there are two bromine atoms.

To calculate the mass of a single bromine molecule -

In 1 mole of Br₂, there is Avogadro's number of molecules.

Avogadro's number = 6.022 x 10²³

Therefore, 1 mole = 6.022 x 10²³

1 mole of bromine has mass of 79.9 g/mol

So, it gives us -

1/6.022 x 10²³ = 1.66 x 10²³/79.9 = 2.654 x 10⁻²²g

For the mass of a single bromine molecule, Br₂ = 2.654 x 10⁻²² g

To learn more about bromine,

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Answer:

Polonium

Selenium

Sulfur

Oxygen

Explanation:

If you see in the Table S of the periodic Table there is a column that says First Ionization Energy (kJ/mol) and you can see the numbersof these elements so then you just put it in order

Polonium 812

Selenium 941

Sulfur 1000

Oxygen 1314

The number of moles of acetone is 4.1 moles.

Let us recall that specific gravity refers to the ratio of the density of a substance to the density of water. Also noting that the density of water has been set to 1 g/mL, the density of the acetone solution is 0.784 g/mL.

Density = mass/volume

mass = Density * volume

mass = 0.784 g/mL *  300.0 mL

= 235.2 g

Number of moles = mass/molar mass

Molar mass of acetone = 58 g/mol

Number of moles of acetone = 235.2 g/ 58 g/mol

= 4.1 moles

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Answer: selenium dichloride

Explanation:

Answer: 5000

Explanation:

Answer:

D. Each jar contains the same number of atoms

Explanation:

Each of jar containing 1 mole of the element has consisted of an equal number of atoms.

Each jar has been consisted of 1 mole of gas. The number of atoms in a mole of gas can be calculated with Avogadro's number.

Avogadro number has been the constant, that relates the particles and the sample constituents. The value of the Avogadro number has been [tex]\rm 6.023\;\times\;10^2^3[/tex] .

1 mole of gas = Avogadro's number molecules

Thus, each of them containing 1 mole of the element has consisted of an equal number of atoms.

For more information about atoms in a mole, refer to the link:

https://brainly.com/question/3982344

Answer:

A and B

Explanation:

Trust me I just did it on a p e x

Answer: he’s correct it’s d and b for me but it’s the same answers

Explanation:

Answer: D) 1.30 and 2.60

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

[tex]Molarity=\frac{n\times 1000}{V_s}[/tex]

where,

n = moles of solute

[tex]V_s[/tex] = volume of solution in ml

molarity  of [tex]MgCl_2[/tex] = [tex]\frac{0.325\times 1000}{250ml}=1.30 M[/tex]

[tex]MgCl_2\rightarrow Mg^{2+}+Cl^{-}[/tex]

As 1 mole of [tex]MgCl_2[/tex] dissociates to give one mole of [tex]Mg^{2+}[/tex] and two moles of  [tex]Cl^-[/tex] ions .

Molarity of [tex]Mg^{2+}[/tex] = 1.30 M

Molarity of [tex]Cl^{-}[/tex] = [tex]1.3 M\times 2=2.60M[/tex]

Answer:

f = 0.084 s⁻¹

Explanation:

Given data:

Frequency of light = ?

Wavelength = 35.6 m

Solution:

Formula:

Speed of light = wavelength × frequency

Speed of light = 3× 10⁸ m/s

by putting values,

3× 10⁸ m/s = 35.6 m ×  f

f = 3× 10⁸ m/s / 35.6 m

f = 0.084 s⁻¹

Answer:

d. all of the above are levels of organization

Explanation:

The followings are the levels of the organization in an ecosystem

1. Individual

2. Population

3. Community

4. Ecosystem

5. Biome

6. Biosphere

So as per the given situation, it involved all three levels that are mentioned in the question

hence, the correct option is d.

Therefore the same is to be considered

The given option are all consisting in the level of organization of ecosystem. Thus, option D is correct.

The ecosystem has been the geographical representation comprising plants, animals, and other biotic and abiotic components.

The ecosystem has been organized in the levels for the understanding of the working and the activity of the ecosystem. The levels of the ecosystem has been:

The organizational levels of the ecosystem have been comprised of community, population, and ecosystem. Thus all the given are level or organizations in the question. Thus, option D is correct.

For more information about the ecosystem, refer to the link:

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Answer:

In first shell only 2 electrons are present in hydrogen only one electron is present in valence shell. To complete its duplet hydrogen can share lose or gain only one electron to form chemical bond.

Hydrogen can form only one bond.

Explanation:

Answer:

C. A technological society has both a positive and negative impact on the environment

Explanation:

It is correct to suggest and to acclaim that a technological society has both a positive and negative impact on the environment.

The environment is the region of space where living organisms and non-living components can be found.

We see that technology has both negative and positive effects on the environment.

Answer:

Ram Ranch

Explanation:

Answer: FLEXUP by lil yacthy and future and playboi carti one of the best songs right now

Explanation:

This question is incomplete, the complete question is;

In a typical calorimetry experiment (similar to what you did with the combustion of cheese balls), a small bag of Skittles (10.0 g) was combusted and the temperature of the water (1.00 kg) increased by 40.0 °C.

a) How much energy (in calories and Food calories) was released by the combustion of the Skittles

b) How many small bags of skittles would a 140 lb person have to eat in order to equal the amount of food calories burned by walking a marathon?

Marathon = 26.2 miles, average person burns 0.453 food calories/mile pound)

Answer:

a)

Number of calories = 40000 Cal

Number of food calorie = 40 KCal

b)

41.54 bags of skittles are required

Explanation:

Given that;

mass of water = 1kg = 1000g

change in Temp ΔT = 40°C

specific heat of H₂O = 4.84 = 1 Cal

Now

heat absorbed by the water = MSΔT

= 1000gm × 1 cal × 40°C = 40000 Cal

so

Number of calories = 40000 Cal

(since food calories = 1000 small calories)

so

Number of food calorie = 40 KCal

Next

number of mile lb , if the man runs in the marathon will be;

26.2 × 140

= 3668 mile lb  

0.453 food calorie is burned for 1 mile pound.

So, amount of food calorie required if the man runs in the marathon will be

0.435 × 3668 mile lb

= 1661.60 food calires.

now

40KCal food calorie is released by 10gm.

So, 1661.60 cal will be released from

⇒ (10gm × 1661.60) / 40 = 415.4 gm

now

1 bag = 10gm,

therefore 415.4 gm = 41.54 bags

∴ 41.54 bags of skittles are required