How many moles of HNO3 are present in 697 grams of HNO3?

0.9541 grams of nickel (ii) hydroxide will be produced if 30.4 mL of 0.673 M KOH react completely and 1.3764 grams of nickel (ii) hydroxide will be produced if the 17.6 mL of 0.841 M NiCl₂ react completely.

According to the balanced chemical equation,

2KOH (aq) + NiCl₂ (aq) → 2 KCI (aq) + Ni(OH)₂ (S)

a. 2 Moles of KOH = one mole of Ni(OH).

As we know,

Molarity = moles/amount of solution(in liters)

For KOH,

0.675 = moles/0.0304

Moles of KOH = 0.02052.

Moles of Ni(OH) = 0.02052/2

Moles of Ni(OH) = 0.01026

We also know,

Moles = formed mass/molar mass

Molar mass of NiOH = 93 grams/mole

0.01026 = formed mass/93

Formed mass of NiOH = 0.9541 grams.

b. 1 Mole of NiCl₂ = one mole of Ni(OH).

As we know,

Molarity = moles/amount of solution(in liters)

For NiCl₂,

0.841 = moles/0.0176

Moles of NiCl₂ = 0.01480

Moles of Ni(OH) = 0.01480

We also know,

Moles = formed mass/molar mass

Molar mass of NiOH = 93 grams/mole

0.01480 = formed mass/93

Formed mass of NiOH = 1.3764 grams.

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Answer:

+ 1/2 and -1/2

Explanation:

if n=2 then l=n-1 i.e, l=1 and 0.

m=plus minus l

so, m= -1, 0, +1

nd spin quantum no. will be + 1/2 and -1/2

Answer:

+ 1/2 and -1/2

Explanation:n=2 then l=n-1 i.e, l=1 and 0.m=plus minus lso, m= -1, 0, +1

Answer: 0.85 hertz

Explanation: Calculator said so also 0.85 is decimal form for 85

Answer:

The balanced chemical equation for the reaction of copper oxide (CuO) with hydrogen gas (H2) to produce copper metal (Cu) and water (H2O) is:

CuO + H2 → Cu + H2O

The stoichiometry of this equation tells us that 1 mole of CuO reacts with 1 mole of H2 to produce 1 mole of Cu. Therefore, if 7.6 moles of CuO are produced, we would need 7.6 moles of H2 to produce the same amount of Cu.

So the answer is: 7.6 moles.

Based on the given reaction, the acid-base pairs in this reaction are:

An acid-base pair refers to a set of two chemical species that are related through the transfer of a proton (H+ ion) during a chemical reaction.

One species acts as an acid by donating a proton, while the other acts as a base by accepting that proton.

In the given reaction:

HCO₃⁻ (aq) + NH₃ (aq) → NH₄⁺ + CO₃²⁻

An acid-base pair can be identified as follows:

HCO₃⁻ (bicarbonate ion) can act as an acid by donating a proton (H⁺), becoming CO₃⁻.

NH₃ (ammonia) can act as a base by accepting a proton (H⁺), becoming NH₄⁺ (ammonium ion).

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Answer:

the answer is A

Explanation:

Answer:

To design a robot that propels itself across an ice rink using the same principles as rockets, I would start by considering the materials that would be suitable for use on ice. Some materials that might work well for this purpose include plastic, rubber, and certain types of metal, such as aluminum or stainless steel.

Explanation:

Answer:

Explanation:

Students learn about humankind’s search for life in outer space and how it connects to robotics and engineering. NASA is interested in sending exploratory missions to one of Jupiter’s moons, Europa, which requires a lot of preparatory research and development on Earth before it can happen. One robot currently being engineered as a proof of concept for a possible trip to explore Europa is the Icefin, which is an innovative robot that can explore under ice and in water, which are the believed conditions on Europa. This lesson provides students with intriguing information about far off (distance and time!) space missions and field robotics, and also sets up two associated robotics and arts integration activities to follow. The lesson can be used individually to provide new information to students, or as a precursor to the associated activities. A PowerPoint® presentation and worksheet are provided

Answer:

mark me as a branlist

Explanation:

determine the number of significant figures in a number use the following 3 rules: Non-zero digits are always significant. Any zeros between two significant digits are significant. A final zero or trailing zeros in the decimal portion ONLY are significant.

The significant figures that are reported in the mean are The decimal place where the standard deviation starts.

Significant figures (or significant digits) are the number of digits in a given value or a measurement, necessary to decide the accuracy and precision of measurement.

They are important in scientific or technical measurements.

Rules for writing significant figures-

1. Non zero digits are significant.

2. Zeros in between non zero digits are significant

3. Zeros on the right of a decimal point and before (or to the left of) the first non-zero digit are not significant.

4. Zeros present on the right of decimal point are significant.

5. Zeros on the right of the last non-zero digit after a decimal point are significant.

Therefore, The significant figures that are reported in the mean are The decimal place where the standard deviation starts.

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The true statements about catalysts are the statement 1,2 and 3.

1. Catalysts increase the rate of reaction: Catalysts facilitate chemical reactions by providing an alternative reaction pathway with lower activation energy. They enhance the rate of the reaction without being consumed in the process.

2. Catalysts behave as reactants in the reaction mixture: Catalysts participate in the reaction by interacting with the reactants. They form temporary bonds with the reactant molecules, leading to the formation of an intermediate complex that ultimately results in the desired products.

3. Catalysts decrease the activation energy of a reaction: Catalysts lower the energy barrier required for a reaction to occur by providing an alternative pathway with a lower activation energy. This enables the reactants to overcome the energy barrier more easily, thus increasing the reaction rate.

4. Catalysts show no physical change at the end of the reaction: Catalysts are not consumed or permanently altered in the reaction. They remain chemically unchanged and are available to participate in subsequent reaction cycles.

The statement "Catalysts are required in large concentrations in a reaction" is false. Catalysts work effectively even in small concentrations, as their role is to facilitate the reaction rather than being directly involved in the stoichiometry of the reaction.

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Explanation:

1 miole of Fe2O is 6.22 × 10^-23

5mole of Fe2O = 5×6.22×10^-23

=31.1×10^-23

Mass of 5 moles  of \(Fe_2O\) is 636 g.

Formula for the calculation of mass is as follows:-

\(Number\ of\ mole=Mass/Molar mass\).......(1)

The molar mass of \(Fe_2O\)is \(2\times55.6\ g+16\ g=127.2 \g\)

So ,the mass of 5 moles  of \(Fe_2O\)is as follows:-

\(5\ mol=Mass/127.2\ g/mol\\5\ mol/times127.2\ g/mol=Mass\\636\ g=Mass\)

Hence, the mass of 5 moles  of \(Fe_2O\) is 636 g.

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Answer:

The southern hemisphere is currently experiencing "Summer"

Explanation:

The Southern hemisphere is experiencing summer because it is closer to the sun than the Northern Hemisphere and also, direct light is more hotter than indirect light.

So, first, let's try an EXPERIMENT!

Take a VERY bright flashlight or a very small laser that can't harm you or just burn a paper in 1 second.

Then, take a piece of paper, or maybe just your skin, (like your hand) and place it under the light or laser, (for the laser, you should probably take the paper), and place the light source right above your skin, then, after some time, when it gets hot, measure the temperature. (around like 30 seconds later),

Note down the temperature...

Now, do the same thing, accept, do it in a very weird angle, face it towards your paper or hand, but, do it in an angle. More than like 30 degrees. Then, after some time, note down the temperature.

You probably, noticed, that the direct light (the one with the straight light facing your paper or skin, was hotter). Look at the image below, and you can understand better.

So, the same thing applies to the earth. The southern hemisphere in this picture is facing more directly to the sun than the northern hemisphere. That is why your answer is

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Remember to have fun, and a nice day!

Answer:   summer

Explanation:

The change in enthalpy when 90.6 g of steam at 100◦C is converted to liquid water at the same temperature and pressure is 204.7 KJ

First, we shall obtain the number of mole water converted to steam. details below:

Mole = mass / molar mass

Mole of water = 90.6 / 18

Mole of water = 5.03 moles

Finally, we shall determine the change in enthalpy. Details below:

ΔH = n × ΔHv

ΔH = 5.03 × 40.7

ΔH = 204.7 KJ

Thus,  we can conclude that the change in enthalpy is 204.7 KJ

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Potential energy is stored energy that is affected by the relative location of different components of a system. When a spring is squeezed or expanded, its potential energy increases.

Potential energy is the energy retained by an object as a result of its location relative to other objects, internal stresses, electric charge, or other variables.  Although it has ties to the ancient Greek scholar Aristotle's idea of potentiality, the word potential energy was coined by the 19th-century Scottish engineer and physicist William Rankine.

The gravitational potential energy of an object, the elastic potential energy of a stretched spring, and the electric potential energy of an electric charge in an electric field are all examples of common kinds of potential energy. The joule, denoted by the sign J, is the measure of energy in the International System of Units (SI).

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We can combine the 2000 ml of 30% alcohol with the 800 ml of distilled water to get 750 ml of 50% alcohol. To get the appropriate 50% alcohol concentration, we'll need to figure out how much of the 30% alcohol and

All living things require the colourless, flavourless, and odourless liquid known as water. It is a versatile solvent that can dissolve a wide range of compounds, which makes it an essential component of numerous chemical and biological processes. Water circulates constantly through the environment through processes including evaporation, precipitation, and transpiration and is found in oceans, rivers, lakes, and underground reservoirs. It can be used for a variety of things, such as drinking, washing, and industrial procedures. Human health depends on having access to clean water, hence efforts are being undertaken to conserve and manage this limited resource wisely

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Conjugate acid-base pair is the combination of two compounds which can accept and donate hydrogen ions.

The compounds are HCI, H₂SO₄, HPO, Acetic acid, Formic Acid, HF, carbonic acid, ammonium ion, water, nitric acid.

a.

Conjugate bases of HCl is Cl⁻.

Conjugate bases of H₂SO₄ is HSO₄⁻.

Conjugate bases of HPO₄²⁻ is PO₄³⁻.

Conjugate bases of CH₃COOH is CH₃COO⁻.

Conjugate bases of formic acid is formate ion.

Conjugate bases of HF is F⁻.

Conjugate bases of carbonic acid is the bicarbonate.

Conjugate bases of ammonium ion ammonia.

Conjugate bases of water is H₃O⁺.

Conjugate bases of HNO₃ is NO₃⁻.

b.

HCl ⇄ H⁺ + Cl⁻

H₂SO₄ ⇄ 2H⁺ + SO₄²⁻

H₃PO₄ ⇄ H⁺ + PO₄³

CH₃COOH ⇄ H⁺ + CH₃COO⁻

HCOOH ⇄ H⁺ + HCOO⁻

HF ⇄ H⁺ + F⁻

H₂CO₃ + H₂O ⇄ HCO₃⁻ + H₃O⁺

Ammonia does not ionizes in water.

H₂O ⇄ H₃O⁺ + OH⁻

HNO₃ ⇄ H⁺ + NO₃⁻

c.

Strong acids: HCl, H₂SO₄, HNO₃,

Weak acids: H₃PO₄, CH₃COOH, HCOOH, HF, H₂CO₃, ammonium ion

Water is both weak and strong acid.

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114.5 g is the total mass of the beaker .

Total mass of beaker=53.10g+5.348g+ 56.1g

Total mass=114.5 g

Mass is used in physics to specific inertia, a fundamental function of all remember. basically, it's far a mass of rely's resistance to changing its course or pace in response to the software of a force.

The exchange that an applied force produces is smaller the extra mass a body has. The kilogram, the unit of mass within the international machine of gadgets, corresponds to 6.62607015 1034 joule seconds using Planck's consistent (SI). One joule is produced by way of multiplying one kilogram by means of one rectangular meter per 2d.

The kilogram is decided by genuine measurements of Planck's regular on account that the second one and the meter have formerly been described in phrases of other bodily constants.

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Answer:

A. High electrical conductivity

Explanation:

solid silver isn't brittle, it has a high melting point, and its not a good insulator.

Although, a part of your question is missing, you might be referring to this full question "How does crushing a candy to smaller pieces affect its digestion?"

Crushing the candy into smaller pieces increases the surface area of the solvent which will result in the reduction of digestion or dissolution.

Digestion is the process in which food taken is broken down into smaller components that can be absorbed into the bloodstream. Digestion helps in converting food into molecules, like glucose so that the body can utilize that energy for its growth and development.

While Crushing the candy into smaller pieces, we are increasing the surface area of the solvent which will result in the reduction of digestion or dissolution of the candy. Thus, the larger the size of the pieces, the slower will be the process of digestion. This physical process in which large pieces of food are cut and crushed into smaller pieces is known as mechanical digestion.

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Answer:

hdbdjsjsj

Explanation:

hdhshshe

The number of moles of AgCl formed during the reaction is 0.0125 mol.

Given the reaction:2AgNO3(aq) + MgCl2(aq) → 2Ag Cl(s) + Mg (NO3)2(aq)We are supposed to determine the moles of solid AgCl formed when 50.0 ml of 0.250 M AgNO3 reacts with excess MgCl2 and in the previous step, we found that 0.0125 mol of AgNO3 reacts.

We can use the stoichiometry method to find the moles of AgCl formed.

To do so, we will have to balance the given chemical equation and find out the number of moles of AgCl formed from the given reactants.

The balanced chemical equation is:2AgNO3(aq) + MgCl2(aq) → 2Ag Cl(s) + Mg (NO3)2(aq)From the equation, we can say that 2 moles of AgCl form from 2 moles of AgNO3 reacted.

In the previous step, we have found the number of moles of AgNO3 reacted, which is 0.0125 mol.

As per the balanced chemical equation, 2 moles of AgCl form from 2 moles of AgNO3 reacted.

Therefore, the number of moles of AgCl formed = (0.0125 mol AgNO3 reacted × 2 moles AgCl / 2 moles AgNO3) = 0.0125 mol AgCl.

The number of moles of AgCl formed during the reaction is 0.0125 mol.

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The second time David build a neutron gun he used radium and thorium instead of aluminum.

David was a young boy who decided to build a neutron gun. His story is described in the text "The Radioactive Boy Scout".

David had in mind the idea of building a neutron gun for this he needed radioactive elements such as radium and thorium, which he obtained by deceiving the officials of the Nuclear Regulatory Commission. This was a very dangerous experiment as radioactive elements are a great danger for health.

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Answer:

no

Explanation:

this answer is because there is no oxygen on the moob

Answer:

Well one good main reason i can think of  is money cause our nation is in a decent amount of economy debt.

Explanation:

Gas law: Combined law, P1 value: 1.82 atm, P2 value: 2.35 atm, T1 value: 293 K, T2 value: 380 K, Kelvin temperature when pressure is increased: 380 K.

The combined gas law is a gas law that combines Boyle's law, Charles's law, and Gay-Lussac's law into one equation. It relates the pressure, volume, and temperature of a fixed amount of gas.

To solve this problem, we will use the combined gas law:

(P1 * V1)/T1 = (P2 * V2)/T2

where P1 is the initial pressure, V1 is the initial volume (constant), T1 is the initial temperature, P2 is the final pressure, V2 is the final volume (constant), and T2 is the final temperature (what we need to find).

The value for V1 and V2 are constant and are not given in the problem statement, but we can assume they are the same since the amount of gas and volume are constant.

Therefore, we can simplify the equation as:

P1/T1 = P2/T2

To find the value of T2, we can rearrange the equation as:

T2 = (P2 * T1)/P1

Now, let's plug in the given values:

P1 = 1.82 atm

T1 = 293 K

P2 = 2.35 atm

T2 = (2.35 * 293)/1.82

T2 = 380 K

Therefore, the gas in the tire will have a temperature of 380 K when the pressure is increased to 2.35 atm.

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The temperature increase from 20 °C to 46 °C indicates that the reaction between zinc and copper sulfate solution is exothermic, with heat being released into the surroundings.

In the given reaction between zinc and copper sulfate solution, the temperature change can provide insights into the type of heat change occurring during the reaction. Based on the provided information, the initial temperature of the copper sulfate solution was 20 °C, and the final temperature of the mixture after the reaction was 46 °C.

The temperature increase observed in this reaction indicates an exothermic heat change. An exothermic reaction releases heat energy into the surroundings, resulting in a temperature rise. In this case, the reaction between zinc and copper sulfate solution is exothermic because the final temperature is higher than the initial temperature.

During the reaction, zinc displaces copper from copper sulfate to form zinc sulfate and copper metal. This displacement reaction is known as a single displacement or redox reaction. Zinc is more reactive than copper and therefore replaces copper in the compound.

The formation of new chemical bonds during the reaction releases energy in the form of heat. This energy is transferred to the surroundings, leading to an increase in temperature. The heat released is greater than the heat absorbed, resulting in a net increase in temperature.

The exothermic nature of this reaction can be explained by the difference in bond energies between the reactants and products. The breaking of bonds in the reactants requires energy input, while the formation of new bonds in the products releases energy.

In this case, the energy released during the formation of zinc sulfate and copper metal is greater than the energy required to break the bonds in copper sulfate and zinc.

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Answer:

\( \huge{ \boxed{111.30 \: \: \text{moles}}}\)

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\( \bold{n = \frac{N}{L} \\ }\)

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.

N = 6.7 × 10²⁵ \( \: H_2SO_4 \: \) molecules

\(n = \frac{6.7 \times {10}^{25} }{6.02 \times {10}^{23} } \\ = 111.2956...\)

We have the final answer as.

Answer:

E = 1.47

Explanation:

To do this, you need to apply the Nerst equation which is the following:

E = E° - RT/nF lnQ (1)

Where:

E: cell voltage

E°: Standard potential reduction

R: universal constant

T: temperature of the system

n: number of electrons transfered during the reaction

F: Faraday constant.

Q: Equilibrium constant

However, as the reaction is taking place at 25 °C, and R and F have constant values, we can reduce the above expression to the following:

E = E° - 0.05916/n lnQ  (2)

We can get the value of Q because it has to do with the reaction which is the following:

2IO₃⁻(aq) + 12H⁺(aq) + 5Co(s) ----------> I₂(s) + 5Co²⁺(aq) + 6H₂O(l)

Now, using only the aqueous state the expression of Q will be:

Q = [Co²⁺]⁵ / [H⁺]¹² [IO₃⁻]²

Replacing the values we have:

Q = (7.82)⁵ / (1.54)¹² * (6.64)²

Q = 3.728

Knowing this, all we need to know now is the standard potential reduction of the reaction. To do so, we need to write the two semi equations of reduction and oxidation:

2IO₃⁻ + 12H⁺ + 10e⁻ ---------> I₂ + 6H₂O       E₁° = 1.20 V

5Co ---------> 5Co²⁺ + 10e⁻                          E₂° = 0.28 V

E° = 1.2 + 0.28 = 1.48 V

Now that we have all the values (n = 10) we can write now the nernst equation to calculate the cell voltage:

E = 1.48 - 0.05916/10 ln (3.728)

E = 1.48 - 0.005916 (1.315872)

E = 1.47 V

This will be the cell voltage

H2O2

\( \mathtt \red{Hope \: it \: helps}\)

Answer:

Explanation:

The pH of 0.02 M hydrochloric acid is approximately 1.7.

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