An experiment requires 18.0 g of cyclohexane, which has a density of 0.7781 g/mL at 25°C. What volume of cyclohexane should be used?

Answer

%Yield = 87.2%

Explanation

Given:

mass of NH3 reacted = 73 g

mass of H2O produced = 101 g

We know:

molar mass of NH3 = 17,031 g/mol

molar mass of water = 18.01528 g/mol

Required: % Yield

Solution:

The formula used to calculate the percentage yield is:

%Yield = (actual yield/theoretical yield) x 100

The actual yield of H2O produced = 101 g

Now lets calculate the theoretical yield first.

First find the number of moles of NH3, and use stoichiometry to find the theoretical mass of water.

n = m/M n is the moles, m is the mass and M is the molar mass.

n = 73/17,031 g/mol

n = 4.29 mol

Using the stoichiometry, there molar ratio between NH3 and H2O is 4:6

Therefore the moles of H2O = 4.29 x (6/4)

n of H2O = 6.43 mol

The theoretical mass can then be calculated:

m = n x M

m = 6.43 mol x 18.01528 g/mol

m = 115.83 g

%Yield = (101 g/115.83)*100

%Yield = 87.2%

Answer: r=0

Explanation: I did it in my calculator hope this helps

Answer:

coal

Explanation:

Hope this helps please mark brainliest

The ability to exert a force that causes an item to move is what is meant by the definition of energy as the "power to accomplish work." Even though the definition is unclear, the meaning is clear: energy is simply the force that moves things. Potential energy and kinetic energy are the two categories of energy.

Renewable energy is frequently cited as the most important shift the world can make to fend off the worst consequences of global warming. This is due to the fact that renewable energy sources like solar and wind don't produce greenhouse gases like carbon dioxide, which contributes to global warming.

Wind, sunlight, bioenergy (organic matter burned as fuel), and hydroelectricity, including tidal energy, are a few examples of renewable energy sources.

The ability to exert a force that causes an object to move is what the definition of energy as "power to accomplish work" refers to. Despite the ambiguity of the definition, the meaning is clear: energy is simply the force that moves things. The two types of energy are potential energy and kinetic energy.

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Answer:

1. Svante Arrhenius

2. Johannes Nicolaus Brønsted and Thomas Martin Lowry

3. Gilbert N. Lewis

Explanation:

The scientist mentioned above researched and made their tested hypothesis available for further research to be built on them and they do these researches to help human understanding of the field and therefore improve knowledge.

Through their different definitions of acid which includes the ability of hydrogen ion (H+) to be produced when a substance is separated from water, the ability of acid to donate a proton (H +), It can be concluded that acids contain hydrogen and they have the ability to donate that  (H +) to other substance.

When ice is placed in a beaker and heated up slowly at a constant heat while being stirred thoroughly, it undergoes a phase change from solid to liquid, and the temperature remains constant during the melting process due to the energy being used to overcome intermolecular forces.

When ice is placed in a beaker and heated up slowly at a constant heat while being stirred thoroughly, it undergoes a phase change from solid to liquid. This process is known as melting and requires the absorption of energy, which is supplied by the heat source. As the ice melts, its temperature remains constant until all the ice has melted, after which the temperature of the water starts to increase.
The reason why the temperature of the melting ice remains constant during the phase change is due to the energy being used to overcome the intermolecular forces that hold the water molecules together in a solid crystal lattice. Once these forces are overcome, the energy supplied by the heat source can be used to increase the kinetic energy of the water molecules and raise their temperature.
It is important to heat the ice slowly and constantly while stirring thoroughly to ensure that the heat is evenly distributed throughout the beaker and that the ice melts uniformly. Rapid heating or uneven heating can cause the ice to melt unevenly, leading to the formation of water pockets and potential safety hazards.
In conclusion, when ice is placed in a beaker and heated up slowly at a constant heat while being stirred thoroughly, it undergoes a phase change from solid to liquid, and the temperature remains constant during the melting process due to the energy being used to overcome intermolecular forces.

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Given that the initial amount of a 20% salt solution is 500 grams, we need to determine the amount 'x' of a 5% salt solution to be added.

Using the formula for mixing solutions, "Initial amount of salt + Additional amount of salt = Final amount of salt," we can calculate 'x'.

The initial amount of salt in the 500 grams of 20% solution is 20% of 500g, which equals 100g.

The additional amount of salt can be determined by considering the concentration of salt in the 5% solution.

For every 100 milliliters (ml) of the 5% solution, there are 5 grams of salt.

Therefore, in 1 liter (1000 ml) or 1000 grams of the 5% solution, there are 5 grams of salt. Consequently, in 'x' grams of the 5% salt solution, the amount of salt present is (5/100) × x grams or x/20 grams.

Setting up the equation, the final amount of salt is given by 100g + x/20g, which should equal (3/20) × 500g (since the final amount is 75g).

Simplifying the equation, we have x/20 + 100 = 75, leading to x/20 = 75 - 100, x/20 = -25, and x = -25 × 20 = -500.

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Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question we have

force = 3000 × 2

We have the final answer as

Hope this helps you

Collisions multiply as temperature rises. A reactant's concentration affects how frequently it collides with other reactants.

The reactant molecules move more quickly on average as the temperature rises. The number of molecules that move quickly enough to react grows as more molecules move quickly, which causes products to form more quickly.

Particles move at a higher average velocity as the temperature rises. These particles' typical kinetic energies are likewise raised. As a result, the particles will clash more frequently as they move quicker and interact with one another encounter more reactant particle.

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Answer:

210 grams

Explanation:

just add them all up

Answer:

Combustion reactions must have oxygen as a reactant. Note that the water that is produced is in the gas rather than the liquid state because of the high temperatures that accompany a combustion reaction.

Explanation:

NOT MY WORK! HOPE THIS HELP!

Answer:Since there is virtually nothing in space to scatter or re-radiate the light to our eye, we see no part of the light and the sky appears to be black.

Explanation:

Yes, the qs for the formation and decomposition of 1 mol of NO have opposite signs.

The heat of formation, or the heat absorbed when 1 mol of a substance is formed from its elements, represents the symbol qf. The heat of decomposition or the heat is given off when 1 mol of a substance breaks down into its elements, is represented by the symbol qd. The relationship between the two qs is that qf and qd are equal in magnitude but opposite in sign; qf is negative and qd is positive.

The relationship between qf and qd is that they are equal in magnitude but opposite in sign. For example, if qf for the formation of NO is -100 kJ, then qd for the decomposition of NO will be +100 kJ.

In summary, qf and qd is the heat absorbed or released during the formation and decomposition of a substance respectively. They are equal in magnitude but opposite in sign. The heat absorbed during formation is negative and the heat released during decomposition is positive.

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the temperature in kelvin scale: 97°C = 370 K

the temperature in Fahrenheit scale: 97°C = 130.8°F

A temperature is a unit used to describe hotness or coldness. It may be stated in terms of any number of arbitrary scales and shows the direction in which heat energy will naturally flow, i.e., from a hotter body to a colder body (one at a lower temperature). Temperature is not the same as energy in a thermodynamic system; for example, a burning match is considerably hotter than an iceberg, yet the total heat energy stored in an iceberg is much more.

Given that,

Boiling point of water in Kathmandu valley is 97°C

Now, firstly convert centigrade to kelvin scale:

1°C = 273 K

Now, 97°C = 370 K

Secondly, convert centigrade to Fahrenheit scale:

1°C = 33.8°F

Now, 97°C = 130.8°F

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The new concentration of the solution can be obtained as  0.0147 M.

Based on the original concentration and the dilution factor, the dilution formula is used to determine the concentration of a solution after dilution. The final volume to beginning volume ratio is known as the dilution factor.

The dilution equation is

C1V1 = C2V2

where C1 is the solution's initial concentration, V1 is its initial volume, C2 is its final concentration, and V2 is the solution's final volume following dilution.

By the use of the dilution formula;

0.1176 * 30 = x * 240

x = 0.0147 M

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The initial pH of pure water is 7.0, and after adding 0.028 mol of NaOH to 280.0 ml of water, the final pH is approximately 13.0 due to an increase in hydroxide ion concentration.

The initial pH of pure water is 7.0, as it is considered neutral. After adding 0.028 mol of NaOH to 280.0 ml of pure water, the final pH can be calculated.

Pure water has a neutral pH of 7.0, which means it has an equal concentration of hydrogen ions (H+) and hydroxide ions (OH-). When NaOH is added to water, it dissociates into Na+ and OH- ions. The OH- ions react with the H+ ions in the water, resulting in an increase in the concentration of hydroxide ions and a decrease in the concentration of hydrogen ions.

To calculate the final pH, we need to determine the concentration of OH- ions after the addition of NaOH. Since 0.028 mol of NaOH is added to 280.0 ml of water, the concentration of OH- ions can be calculated using the molarity formula:

Molarity = Moles of solute / Volume of solution (in liters)

Converting the volume of water to liters (280.0 ml = 0.280 L), we can calculate the molarity of the OH- ions:

Molarity of OH- = (0.028 mol) / (0.280 L) = 0.10 M

The concentration of OH- ions corresponds to the pOH value, which is the negative logarithm (base 10) of the hydroxide ion concentration:

pOH = -log [OH-] = -log (0.10) ≈ 1.0

Since pH + pOH = 14 (for neutral solutions), the final pH can be calculated:

pH = 14 - pOH = 14 - 1.0 = 13.0

Therefore, the final pH after adding 0.028 mol of NaOH to 280.0 ml of pure water is approximately 13.0.

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According to the VSEPR model, electron pairs in the valence shell of an atom define regions of electron density that repel each other. In the case of SbF3, the central Sb atom has three regions of electron density and one unshared pair. This gives a total of four electron pairs and a resulting geometry of tetrahedral.

The tetrahedral geometry of SbF3 is defined by the four electron pairs around the central Sb atom.

1. According to the VSEPR model, the central Sb atom in SbF3 has three regions of electron density and one unshared pair.
2. This gives a total of four electron pairs around the Sb atom.
3. The resulting geometry of these four electron pairs is tetrahedral.
4. The tetrahedral geometry of SbF3 is thus defined by the four electron pairs around the central Sb atom.

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C₁OH₈ formula is an alkene hydrocarbon in the nature of its existence.

What are hydrocarbons?

The only two types of atoms that make up all of an organic complex called a hydrocarbon are carbon and hydrogen. The majority of the time, hydrocarbons are colourless gases with hardly detectable odours. Alkanes, alkenes, alkynes, and aromatic hydrocarbons are the four subcategories that are generally used to classify hydrocarbons. These compounds can have relatively simple structures or relatively complex structures.

The study of hydrocarbons can shed light on other functional groups' chemical composition and behaviour. Liquefied petroleum gas, which is derived from hydrocarbons like propane and butane, is also employed as a source of fuel for commercial reasons (LPG). One of the most basic aromatic hydrocarbons, benzene, is used as the starting point for the creation of numeroubrainly.com/question/17578846s synthetic medications.

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Answer:

2

Explanation:

Answer:

atmosphere

Explanation:

atmosphere is composed of all air particles surrounding the Earth

biosphere is composed of all living organisms on the Earth

hydrosphere is composed of all water particles in the Earth

I guess geosphere is all about rocks and soils

Answer:

b

Explanation:

Answer:

The answer is B

Explanation:

Answer:

the oxidation number is 4

The kind of material used to bake food will influence how much energy is required to heat it up and how quickly it cools. Due to the fact that metal conducts heat more effectively than glass, heating up metal pans often takes longer than heating up glass ovenware.

This implies that the metal absorbs heat from the oven more rapidly and effectively, needing more energy to attain the appropriate temperature. However, oven-safe glass will cool down more quickly than metal.

This is due to the fact that glass is a poor heat conductor, which means it takes more time for the heat to be absorbed by the glass. The glass will shatter after the dish is cooked and the heat is turned off.As the heat takes longer to dissipate, the metal cools down more quickly than the other materials.

In conclusion, glass cools more quickly than metal and requires less energy to heat up than oven-safe metal. This is because metal absorbs heat from the oven more rapidly and effectively than glass since metal is a stronger heat conductor than glass.

However, because glass is a poor conductor of heat, it takes longer for the food to cook and the heat to be absorbed. The glass cools down more quickly than the metal when the heat is gone.

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Answer:

the trapping of the sun's warmth in a planet's lower atmosphere, due to the greater transparency of the atmosphere to visible radiation from the sun than to infrared radiation emitted from the planet's surface.

Answer:

The warming of a planet due to trapped radiation.

Answer:

The awser is D.

Answer: B.They are arranged in energy levels

Explanation: Electrons orbit around the nucleus of an atom, and are not spread around equally throughout an atom because there are a different amount of electrons that can fit in each energy level or electron shell (both are the same thing). For example the first energy level can hold up to 2 electrons, the second shell can hold up to 8 electrons, the third can hold up to 18, and so on represented by the equation 2(n^2)

Taking into account the reaction stoichiometry, 1 mole of potassium hydroxide would react with 1 mole of hydrochloric acid

In first place, the balanced reaction is:

KOH + HCl  → KCl + H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

You can see that the stoichiometric mole ratio of KOH to that of HCl is 1:1. This means that 1 mole of KOH will require 1 mole of HCl.

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The following atoms have in common the atomic number, which is the number of protons in the nucleus of an atom. Fe2+, Fe3+, Fe-54, and Fe-59 all represent different isotopes of the element iron (Fe), but they all have the same atomic number of 26.  Option C is the correct answer.

The atomic number of an element defines its identity and determines its position in the periodic table. It represents the number of protons in the nucleus of an atom. In this case, all the given atoms represent different isotopes of iron (Fe) with different numbers of neutrons and different atomic masses. However, they all have the same atomic number of 26, indicating that they belong to the same element.

The common characteristic among Fe2+, Fe3+, Fe-54, and Fe-59 is their atomic number, which is 26.

Option C is the correct answer.

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Answer:

It represents the relationship between the distance travelled and time spent as constant or at a stop.

Explanation:

This is because as the line progresses, the time increases the distance should change as well my moving up or down, in a linear equation this relationship is constand but if the line is horizontal though, the distance is not changing despite time passing which means it has come to a stop.

Answer:

7% 4)2(10

Explanation:

beacouse if you divide it you can get the answer