Mercury(II) oxide (HgO) decomposes to form mercury (Hg) and oxygen (O2). The balanced chemical equation is shown below. 2HgO Right arrow. 2Hg O2 The molar mass of HgO is 216. 59 g/mol. The molar mass of O2 is 32. 00 g/mol. How many moles of HgO are needed to produce 250. 0 g of O2? 3. 906 7. 813 15. 63 73. 87.

Answer:

KNO lower case 2

Explanation:

The concentration of the KOH solution is 0.100 M. To calculate the concentration of the KOH solution, we can use the formula:

Molarity (M) = (moles of solute) / (volume of solution in liters)

Given:

Mass of KHP (potassium hydrogen phthalate) = 3.458 g

Molar mass of KHP = 204.22 g/mol

Volume of KOH solution = 45.71 mL = 0.04571 L

First, we need to calculate the moles of KHP:

moles of KHP = (mass of KHP) / (molar mass of KHP)

moles of KHP = 3.458 g / 204.22 g/mol ≈ 0.01693 mol

Next, we can calculate the concentration of the KOH solution:

Molarity of KOH solution = (moles of KOH) / (volume of solution)

Molarity of KOH solution = 0.01693 mol / 0.04571 L ≈ 0.370 M

Converting the concentration to scientific notation, we have:

Molarity of KOH solution ≈ 3.70 x 10^-1 M

Therefore, the concentration of the KOH solution is approximately 0.100 M.

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Acetals can be hydrolyzed using catalytic acid to produce a carbonyl compound and alcohol. If the acid concentration is increased, acetal can be hydrolyzed back to its initial aldehyde or ketone form.

This mechanism occurs in the opposite direction of the acetal formation mechanism. The hydrolysis of each acetal generates a carbonyl compound and an alcohol.What are Acetals?Acetals are organic compounds that are formed by the reaction of an aldehyde or ketone with two molecules of alcohol, and they have the following general structure: R1R2C(OR')2.Acetals can be regarded as derived from hemiacetals, which are formed by the reaction of an aldehyde or ketone with one molecule of alcohol.The carbonyl carbon in an acetal is bonded to two alkoxide (OR) groups, while the carbonyl carbon in a hemiacetal is bonded to only one. As a result, acetals are more stable than hemiacetals. Acetals are widely used in organic synthesis, including as protecting groups for carbonyl groups in reactions that would otherwise destroy them.Example:Acetal hydrolysis occurs when an acid catalyst is used to cleave the two ether bonds in the molecule. When an acetal is hydrolyzed with an acid catalyst such as H2SO4, a carbonyl compound and an alcohol are formed.Example:H2SO4 is added to the acetal, which hydrolyzes it, producing an aldehyde or ketone and two alcohol molecules. For example, if dimethyl acetal is hydrolyzed, it will yield acetone and two methanol molecules.

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The carburizing time necessary to achieve a carbon concentration of 0.30 wt% at a position 4 mm into an iron-carbon alloy is 63.4 hours.

To determine the carburizing time necessary to achieve a carbon concentration of 0.30 wt% at a position 4 mm into an iron-carbon alloy, we can use Fick's second law of diffusion:

\(DC_{surface} / 2 = (C_{surface} - C_{4mm}) / erf(x / (2 * \sqrt{Dt} ))\\\)

where D is the diffusion coefficient, \(C{surface}\\\) is the surface carbon concentration (0.90 wt%), C_4mm is the carbon concentration at the position 4 mm into the alloy (0.10 wt%), x is the distance from the surface (4 mm), and t is the carburizing time we want to find.

We can use the diffusion coefficient for γ-Fe at 1100°C from Table 5.2, which is D = \(6.0 * 10^{-12} m^2/s.\)

Substituting the given values, we get:

\((6.0 * 10^{-12} m^2/s) * (0.90 - 0.30) / 2 = (0.90 - 0.10) / erf(4 mm / (2 * \sqrt{6.0 * 10^{-12} m^2/s} ))\)

Simplifying the left-hand side, we get:

\(1.8 * 10^{-12} m^2/s = (0.80) / erf(4 mm / (2 * \sqrt{(6.0 * 10^{-12} m^2/s) * t)})))\)

Taking the inverse error function of both sides, we get:

\(erf(4 mm / (2 * \sqrt{6.0 * 10^{-12} m^2/s) * t)} ) = 0.000346\)

Substituting this back into the previous equation, we get:

\(1.8 * 10^{-12} m^2/s = (0.80) / 0.000346\)

Solving for t, we get:

t = 63.4 hours

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A molecule is made up of two or more atoms held together by chemical bonds in a stable association. The atoms may or may not belong to the same element

Molecules refer to groups of two or more atoms that are held together by chemical bonds in a stable association. This bond is formed when the electrons that orbit the atoms' nucleus intermingle. As a result, the atoms' outermost shells fill up with electrons, providing stability to the molecule. The atoms in a molecule may belong to the same element or to different elements.

When they belong to different elements, the molecule formed is called a compound molecule. For example, carbon dioxide (CO₂) is a compound molecule that consists of one carbon atom and two oxygen atoms. The bond between these atoms is formed because the carbon atom requires two more electrons to fill its outer shell while the oxygen atoms require two electrons each to fill their outer shells, resulting in a stable molecule.

Therefore, a molecule is made up of two or more atoms held together by chemical bonds in a stable association. The atoms may or may not belong to the same element.

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Answer:

\(V_{2} = 29.28\,L\)

Explanation:

Let assume that gas behaves ideally and experiments an isobaric and isothermal processes. The following relationship is applied to determined the final volume:

\(\frac{V_{1}}{n_{1}} = \frac{V_{2}}{n_{2}}\)

\(V_{2} = V_{1} \cdot \left(\frac{n_{2}}{n_{1}} \right)\)

\(V_{2} = (12.2\,L)\cdot \left(\frac{16.8\,moles}{7\,moles} \right)\)

\(V_{2} = 29.28\,L\)

Answer:

increase

Explanation:

dont known reason burr answer is correct

Answer:

When temperature increases ,gas increases ,because of the rise in temperature evaporation will take place.

Explanation:

When you boil water to make coffee/tea the kettle/boiler releases the evaporation caused by the rise in temperature.

Answer:

KOH + H2SO4 --> K2SO4 + H2O

Answer:

122 grams of NH3 will be produced when 22 grams of H2 react completely.

Explanation:

First, we need to calculate the number of moles of H2 present in 22g of the substance:

Number of moles of H2 = Mass of H2 / Molar mass of H2

Number of moles of H2 = 22g / 2 g/mol = 11 mol

According to the balanced chemical equation, the reaction between H2 and N2 produces NH3 in a 3:2 ratio. This means that for every 3 moles of H2, 2 moles of NH3 are produced. We can use this ratio to calculate the number of moles of NH3 produced:

Number of moles of NH3 = (2/3) x Number of moles of H2

Number of moles of NH3 = (2/3) x 11 mol = 22/3 mol

Finally, we can use the molar mass of NH3 to convert the number of moles of NH3 to grams:

Mass of NH3 = Number of moles of NH3 x Molar mass of NH3

Mass of NH3 = (22/3) mol x 17 g/mol = 122 g (rounded to three significant figures)

Answer:

2. Distillation Flask

3. Fractionating column

4. Thermometer

5. Condenser

6. cold water in

7. cold water out

8. Recieving flask

13. Electric heater

The statement is true. A molecule with polar bonds can either be polar or nonpolar depending on the arrangement of the polar bonds. Polar bonds are formed when two atoms with different electronegativities bond, resulting in an unequal sharing of electrons.

The more electronegative atom attracts the electrons towards itself, creating a partial negative charge while the other atom has a partial positive charge.

If the polar bonds in a molecule are arranged symmetrically, such that the partial charges on each atom cancel out, then the molecule is nonpolar.

However, if the polar bonds are arranged asymmetrically, such that the partial charges do not cancel out, then the molecule is polar.

For example, carbon dioxide (CO2) has two polar bonds between the carbon and oxygen atoms, but the molecule itself is nonpolar because the bonds are arranged symmetrically around the carbon atom, canceling out the partial charges.

On the other hand, water (H2O) also has polar bonds between the hydrogen and oxygen atoms, but the molecule is polar because the bonds are arranged asymmetrically, resulting in a partial negative charge on the oxygen atom and a partial positive charge on the hydrogen atoms.

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The pile of firewood  does not immediately release the energy in its chemical bonds because activation energy is higher in case of solids where forces of attraction is maximum.

Forces of attraction  is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different  states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases  as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

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The amount of water vapor in the atmosphere is measured as absolute humidity, whereas relative humidity is the ratio of the amount of water vapor to the maximum amount of water vapor that can be held by an air mass.

The amount of water vapor in the atmosphere is measured as specific humidity, whereas relative humidity is the ratio of the amount of water vapor to the maximum amount of water vapor that can be held by an air mass.

Therefore, the unit used to measure specific humidity is grams of water vapor per kilogram of air (g/kg), while the unit used to measure relative humidity is a percentage (%).

Specific humidity is an absolute measure of the amount of water vapor present in the air, while relative humidity is a relative measure that compares the actual amount of water vapor to the maximum amount that can be held at a given temperature.

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Answer:

Mass number is 24 and the element is sodium (Na)

The mass of water needed to absorb 456 J is 1.44 g

We'll begin by calculating the change in the temperature of the water.

Initial temperature of water (T₁) = 22.7 °C

Final temperature (T₂) = 98.3 °C

ΔT = T₂ – T₁

ΔT = 98.3 – 22.7

Heat absorbed (Q) = 456 J

Change in temperature (ΔT) = 75.6 °C

Specific heat capacity of water (C) = 4.184 J/gºC

Q = MCΔT

456 = M × 4.184 × 75.6

456 = M × 316.3104

Divide both side by 316.3104

M = 456 / 316.3104

Therefore, the mass of the water is 1.44 g

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Answer:

Explanation:

It is a physical change. The reason is that when a straight piece of wire is coiled to form a spring, its chemical properties do not change. Only the physical property ( shape ) of the wire changes.

Hope this helps

plz mark as brainliest!!!!!!

Answer:

See below

Explanation:

If a piece of wire is coiled to form a spring, it is a physical change. This is because there is no change in it's bonds rather there is a change in its shape and figure. Also, Physical change is reversible such that the coiled piece of wire can be changed back to a straight piece of wire. But, A chemical change is irreversible.

So, This is a physical change.

Answer:

df

Explanation:

fawfe

Answer:

yes it is

hope it helps you

Explanation:

There is a limit to different things we encounter around the universe due to a lot of reasons.

To overcome these barriers, some catalysts that are not readily available are needed. This reduces the combination of some atoms in nature.

This and many more reasons limits the combination of chemical substances.

There is a limit to different things we encounter around the universe due to a lot of reasons:

So, for a chemical reaction to occur there are certain parameters that need to taken into consideration for a chemical reaction to actually takes place.

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The molecule that contains 6 atoms comprising a single functional group is Hexanol, under the condition that the given molecule is that of an alcohol.

Its molecules contain 6 carbon atoms. The finishing -ol states an alcohol (the OH functional group), and the hex- stem presents  that there are six carbon atoms in the LCC. The OH group is assembled to the second carbon atom.
Functional groups are considered as specified groups of atoms within molecules that are the reason for characteristic chemical reactions of those molecules . Some examples of functional groups include alcohols, aldehydes, ketones, carboxylic acids, esters, ethers, halogens, amines and amides.
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The complete question
Name a molecule that contains 6 carbon atoms with a single functional group that is an alcohol

After 24.3 days, 3 half-lives of iodine-131 have passed. Therefore, the amount remaining can be found by multiplying the original amount of 75.0 mg by \((1/2)^3\), which equals 9.38 mg. Option B is correct.

The decay of radioactive isotopes can be modeled using the concept of half-life. Half-life is the amount of time it takes for half of the original sample of the isotope to decay.

In this problem, we are given that the half-life of iodine-131 is 8.1 days. This means that after 8.1 days, half of the original sample will remain, and after another 8.1 days, half of that remaining sample will decay, and so on.

We can use this information to find how much of a 75.0 mg sample of iodine-131 will remain after 24.3 days.

First, we need to determine the number of half-lives that have elapsed. To do this, we divide the elapsed time by the half-life:

24.3 days / 8.1 days per half-life = 3 half-lives

So, after 3 half-lives, the amount of iodine-131 remaining can be found by multiplying the original amount (75.0 mg) by \((1/2)^3\) (since 3 half-lives have passed):

Amount remaining = 75.0 mg * \((1/2)^3\)

= 75.0 mg * 0.125

= 9.38 mg

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Complete question:

The half-life of iodine-131 is 8.1 days. how much of a 75.0 mg sample will remain after 24.3 days? group of answer choices

A - 75.0 mg

B - 9.38 mg

C - 4.68 mg

D - 18.8 mg

E - 37.5 mg

A diprotic weak acid is an acid that has two replaceable hydrogen atoms. The acid will then undergo two dissociations to produce two hydrogen ions. As a result, the acid's reaction with bases is more complex, and it is dependent on the concentration of acid and pH.

A diprotic weak acid is an acid that has two replaceable hydrogen atoms. The acid will then undergo two dissociations to produce two hydrogen ions. As a result, the acid's reaction with bases is more complex, and it is dependent on the concentration of acid and pH. When titrated, the following data must be considered: the concentration of the acid, the concentration of the base, and the pKa values of the acid. The equivalent point is the point in titration where the number of moles of acid is equal to the number of moles of base added to it. In a titration curve, the first equivalence point is determined by the point where the initial amount of diprotic acid is neutralized. It's the point where the base added to the acid neutralizes all the H+ present in the solution.

The amount of strong base required to reach the first equivalence point can be calculated as follows: As per the equation, 1 mole of diprotic acid releases two moles of hydrogen ions, which means that to neutralize one mole of acid, you will require two moles of strong base. Therefore, you would require two moles of strong base to reach the first equivalence point in a titration curve. The pKa of the second titratable hydrogen would be equal to the pH at the halfway point between the two equivalent points. As a result, the amount of strong base required to reach the pH equivalent to the pKa of the second titratable hydrogen is also equal to the amount required to achieve the halfway point between the two equivalence points.

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Answer:

Burning Paper

Explanation:

Burning Paper is an example of a chemical change because;

-  A new substance called  ''Ash'' is formed.

- It is an irreversible reaction.

Answer:

Presence of an Electrolyte

Metal Surface

Oxygen or Other Oxidizing Agent

Difference in Potential

Electrochemical Pathway

Explanation:

Answer:

The heat required to vaporize 102.3 grams of H₂O(l) is 231198 J.

Explanation:

The heat required to vaporize 102.3 g of H₂O(l) can be calculated as follows:

\( q = m*\Delta H_{v} \)

Where:

q: is the heat  

ΔHv: is the heat of vaporization of water = 2260 J/g

m: is the mass = 102.3

\(q = m*\Delta H_{v} = 102.3 g*2260 J/g = 231198 J\)

Therefore, the heat required to vaporize 102.3 grams of H₂O(l) is 231198 J.

I hope it helps you!

The heat required to vaporize 102.3 grams of H₂O(l) is 231198 J.

The heat required to vaporize 102.3 g of H₂O(l) can be calculated as follows:

\(q=m\times H_v\).....(1)

Here,  q is the heat  

\(H_{v}\): is the heat of vaporization of water = 2260 J/g

m: is the mass = 102.3 g

Substitute the value in equation (1) as follows:-

\(q=102.3\ g\times2260\ J/g\\\\=231198\ J\)

Therefore, the heat required to vaporize 102.3 grams of H₂O(l) is 231198 J.

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Mono addition of HBr to conjugated dienes leads to multiple products, and a given addition product can arise from more than one conjugated diene. The pair of dienes which can serve as precursors for both of the addition products are diene 1 and diene 2. Diene 1 can give rise to the allylic bromide product A as well as product B.

Diene 2 can give rise to the allylic bromide product C as well as product B.
The other three dienes cannot give rise to either of the two given allylic bromide products.
The given pairs of dienes are:
(a) H2C=CHCH=CH2 and H2C=CHCH2CH=CH2
(b) H2C=CHCH=CH2 and H2C=CHCH=CHCH3
(c) H2C=CHCH=CHCH3 and H2C=CHCH2CH=CH2
(d) H2C=CHCH=CHCH3 and H2C=CH2CH=CHCH3
(e) H2C=CHCH=CHCH3 and H2C=CH=CHCH2CH3 The given allylic bromide products are 1,2-dibromobutane and 2-bromo-2-butene respectively. Hence, the correct pair of dienes is (b) H2C=CHCH=CH2 and H2C=CHCH=CHCH3, since both of these dienes can act as precursors for both of the allylic bromide products.

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Answer:

v = 1.5 m/s

Explanation:

Given that,

Distance covered by a person, d = 105 m

Time taken, t = 70 s

We need to find the average speed of the person. We know that the average speed is given by :

\(v=\dfrac{d}{t}\\\\v=\dfrac{105\ m}{70\ s}\\\\v=1.5\ m/s\)

So, the average speed of the person is equal to 1.5 m/s.

Nuclear energy is harmful because it releases of harmful ionizing radiation and has been employed in the production of atomic bombs and hydrogen bombs.

Nuclear energy is beneficial in that it produces vast amount of energy for domestic and industrial purposes.

Nuclear energy refers to the energy which is produced as a result of the changes that occur in the nucleus of atoms of elements.

Nuclear energy produces the largest amount of energy when compared to other forms of energy sources.

Nuclear energy is produced by two types of nuclear reactions:

Nuclear energy is harmful in that it results in the release of harmful ionizing radiation which damages cells and tissues of living organisms.

Nuclear energy is also harmful because nuclear energy has been employed in the production of atomic bombs and hydrogen bombs.

On the other hand, nuclear energy is beneficial in that it produces vast amount of energy which can be used for domestic and industrial purposes. It also produces fewer wastes that damage the environment compared to fossil fuels.

In conclusion, nuclear energy is both beneficial and harmful.

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Pascal and one atmosphere pressure are equivalent at 1atm=101325Pa.

Additionally, we are aware that 1 Pascal equals 105 dynes per cubic centimetre. These two values must be multiplied in order to translate the value of one atmosphere into the Z value of Pascal. As a result, 1 atm (atmospheric pressure) equals 1.01325105Nm2, or 101325.

(Pressure in atm) x (1.01325 x 105 Pa/1 atm) equals pressure in Pa.

Pressure in Pa = 1.0045 x 107 P

One atmosphere, or one atm, is about similar to the average atmospheric pressure at sea level on Earth.

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