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If if a reaction that should theoretically yield 20 g of a product has a 45% yield, The actual yield of product is 9g.

Using this formula to find  the actual yield of product

Actual yield of product = Actual yield × Theoretically yield

Where:

Actual yield  = 45% or 0.45

Theoretically yield = 20g

Let plug in  the formula

Actual yield  = 0.45 × 20g

Actual yield= 9g

Therefore the actual yield is 9g.

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Taking into account definition of percent yield, the actual yield of the product is 9 g.

The percent yield is the ratio of the actual return to the theoretical return expressed as a percentage.

The percent yield is calculated as the experimental yield divided by the theoretical yield multiplied by 100%:

percent yield= (actual yield÷ theoretical yield)× 100%

where:

In this case, you know:

Replacing in the definition of percent yield:

45%= (actual yield÷ 20 g)× 100%

45%÷100%= actual yield÷ 20 g

0.45= actual yield÷ 20 g

0.45×20 g= actual yield

9 g= actual yield

Finally, the actual yield is 9 g.

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Answer:

A.) 14.75 mol

Explanation:

To find the amount of moles, you need to use the Ideal Gas Law equation:

PV = nRT

In this equation,

-----> P = pressure (atm)

-----> V = volume (L)

-----> n = number of moles

-----> R = Ideal Gas Constant (0.08206 L*atm/K*mol)

-----> T = temperature (K)

You can plug the given values and the constant into the equation and simplify to find "n".

P = 10 atm                    R = 0.08206 L*atm/K*mol

V = 27 L                       T = 223 K

n = ? moles

PV = nRT                                                                   <----- Ideal Gas Law

(10 atm)(27 L) = n(0.08206 L*atm/K*mol)(223 K)   <----- Insert variables

270 atm*L = n(18.299 L*atm/mol)                           <----- Mutliply

14.75 mol = n                                               <----- Divide both sides by 18.299

The pH of the solutions are as follows:

a. pH = 4.4

b. pH = 0.2

The pH of a solution is a measure of the acidity or basicity of a solution.

The pH is defined as the negative logarithm of the hydrogen ion concentration of a substance.

pH = -log [H⁺]

where [H⁺] is the hydrogen ion concentration

The pH of the solutions are as follows:

a.  150.0 ml of a 3.5 x 10⁻⁵ M HNO3.

pH = -log (3.5 x 10⁻⁵)

pH = 4.4

b. 250.0 ml of a 0.63 M solution of HNO2

pH = -log (0.63)

pH = 0.2

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Taking into account the definition of calorimetry, if the final temperature is 34 °C, the specific heat of the metal is 0.8381 J/gC.

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

When heat added or removed from a substance causes a temperature change in it without affecting its molecular structure, it is called sensible heat.

The expression that allows to calculate heat exchanges is:

Q = c× m× ΔT

where:

In this case, you know:

Replacing in the expression to calculate heat exchanges:

If two isolated bodies or systems exchange energy in the form of heat, the quantity received by one of them is equal to the quantity transferred by the other body. That is, the total energy exchanged remains constant, it is conserved.

Then, the heat that the gold gives up will be equal to the heat that the water receives. Therefore:

- Qmetal = + Qwater

- Specific heat of metal × 90 g× (34 C -98.6 C)= 4.186 J/gC× 120 g× (34 C - 24.3 C)

Solving:

- Specific heat of metal × 90 g× (34 C -98.6 C)= 4,872.504 J

Specific heat of metal × 5,814 gC= 4,872.504 J

Specific heat of metal = 4,872.504 J÷ 5,814 gC

Specific heat of metal = 0.8381 J/gC

Finally, the specific heat of the metal is 0.8381 J/gC.

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Answer:

No entendí porfavor puedes explicarme

The result of the Heat Transfer experiment is given as follows:  "The molecule was increased in kinetic energy but in a random structure." (Option B)

Heat transfer is a thermal engineering subject that deals with the creation, consumption, conversion, and exchange of thermal energy across physical systems.

Heat transmission is categorized into several methods, including thermal conduction, thermal convection, thermal radiation, and energy transfer via phase shifts.

At 3 p.m., the water temperature is raised. The average kinetic energy of an item is related to its temperature. As a result, as temperature rises, so does average kinetic energy.

Kinetic energy is created by the random movement of molecules. Hence, the correct answer is "The molecule was increased in kinetic energy but in a random structure."

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Full Question:

A student investigated heat transfer using a bottle of water. The student placed the bottle in a room at  20.50C. The student measured the temperature of the water in the bottle at 7 a.m. and again at 3 p.m.  The data from the investigation are shown in the table below.

[See attached image]

Question:How would you describe the average kinetic energy of the water molecules in the bottle at 7 a.m. to  the average kinetic energy of the water molecules in the bottle at 3 p.m.

Based on the mass of the sample, the percentage mass of urea in the urea/cholesterol mixture is 65.3%.

The percentage mass of urea in the urea/cholesterol mixture is determined using the formula below:

The mass of urea in the sample is obtained using the formula below:

During the separation procedure of the mixture, urea which is soluble in water goes into the solvent phase whereas cholesterol is obtained as a solid.

Hence, the 0.52 g solid sample collected is cholesterol.

mass of urea = 1.50 - 0.52

mass of urea = 0.98

Percentage urea = 0.98/1.5 * 100%

Percentage mass of urea = 65.3%

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Plants absorbs the atmospheric carbon dioxide and use it up for photosynthesis.  Hence, increasing plant biomass reduces the atmospheric carbon dioxide.

Photosynthesis is a biochemical process by which the plants synthesis glucose and energy in leaves using carbon dioxide and water with the aid of light energy.

The pigment chlorophyll is a photoactive substance which absorbs the light energy. Using carbon dioxide and water plants synthesis glucose and oxygen is released in this reaction.

Therefore, as the plant biomass increases, the intake of carbon dioxide by these plants increases, leading to a reduction in the atmospheric carbon  dioxide which is good to decline the effect of global warming also.

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0.33 mol is the amount of the unknown gas present.

The ideal gas law states that "the pressure multiplied by volume is equal to moles multiply by the universal gas constant multiply by temperature.

It is expressed as;

P × V = n × R × T

Where P is pressure, V is volume, n is the amount of substance, T is temperature and R is the ideal gas constant ( 0.08206 Latm/molK ).

Given the data in the question;

Plug the given values into the ideal gas law formula and solve for n ( amount of gas in moles ).

P × V = n × R × T

n = ( P × V ) / ( R × T )

n = ( 1.00atm × 8.00L ) / ( 0.08206Latm/molK × 298.15K )

n = 8.00Latm / 24.466189Latm/mol

n = 0.33 mol.

Therefore, the amount of gas is 0.33 mol.

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hope this helps you out I would have typed an answer using my notes but that was taking to long anyways have a nice day

Answer:

it will be all water and it needs to cool of

Sodium oxide is created by the chemical reaction statement best describes the reaction .

What is chemical reaction ?

Chemical reactions happen absolutely everywhere. While we sometimes associate chemical reactions with the sterile environment of test tubes and laboratories, nothing is farther from the truth. In fact, a vast number of transformations are creating a dizzying and almost incomprehensible series of new matter and energy changes in our world every second of every day.

In nature, chemical reactions are much more uncontrollable and sometimes much more complex than in the laboratory. Chemical reactions usually occur as needed. The fire raging in the forest, the slow rusting process of iron over the years in the presence of oxygen and water, or the delicate ripening of the fruit on the tree, the process of transforming various chemicals... ( The transformation of one group of substances (products) into another group of substances (products) is a so-called chemical reaction.

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Considering the definition of percent by mass, the correct answer is the third option: the correct formula to calculate percent by mass is [Mass of solute (g) ÷ mass of solution (g)] × 100

The percent by mass is a measure of the amount of mass that an element occupies in a compound and it is defined as the ratio of the mass of the solute to the mass of the solution, expressed as a percentage.

To calculate the percentage of composition, it is necessary to know the mass of the element in a known mass of the compound.

So, the percent by mass is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage:

percent by mass= [Mass of solute (g) ÷ mass of solution (g)] × 100

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The vessel will not explode since the new gas pressure is less than 3 atm.

The pressure when the temperature of a given volume of nitrogen gas is heated is calculated using the formula given below:

where;

Solving for P₂

P₂ = P₁ * T₂ / T₁

P₂ = 0.836 * (680 + 273) / (20 + 273)

P₂ = 2.72 atm

The new pressure is less than 3 atm.

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Acetic anhydride is a colorless liquid with a characteristic pungent odor. It is used in the manufacture of plastics, drugs, dyes, perfumes, explosives, and aspirin.

This chemical compound has a colorless liquid appearance, also called anhydride, acetic, smells like vinegar.

Answer:

0.5 7.0 there is so many results

Explanation:

its very simple

To solve such this we must know the concept of chemical reaction and concept of limiting agent. Therefore, C[tex]_2[/tex]H[tex]_3[/tex]O[tex]_2[/tex]H is limiting agent in the given balanced equation.

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.

The balanced reaction is

3 C[tex]_2[/tex]H[tex]_3[/tex]O[tex]_2[/tex]H + Al(OH)[tex]_3[/tex][tex]\rightarrow[/tex]

The limiting reagent depends on the mole ratio and not on the masses of the reactants present. 1 mole of  Al(OH)[tex]_3[/tex] need 3 moles of 3 C[tex]_2[/tex]H[tex]_3[/tex]O[tex]_2[/tex]H. So, C[tex]_2[/tex]H[tex]_3[/tex]O[tex]_2[/tex]H is limiting reagent.

Therefore, C[tex]_2[/tex]H[tex]_3[/tex]O[tex]_2[/tex]H is limiting reagent.

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The volume of CO₂ produced at STP when 891.6 grams of C2H6 is burned in excess oxygen gas is 1331.4 liters.

The volume of a gas produced at STP is determined from the mole ratio of the reaction that produces the gas.

The mole ratio of the reaction that produces the gas is obtained from the equation of the reaction.

Considering the given data, the volume of CO₂ produced when  891.6 grams of C2H6 is burned in excess oxygen gas is calculated as follows:

Equation of reaction: 2 C₂H₆ (g) + 7 O₂ (g) → 4 CO₂ (g) + 6 H₂O (g)

2 moles of C₂H₆ when burned in excess oxygen at STP produces 4 moles of CO₂.

The number of moles of C₂H₆ in 891.6 grams is calculated as follows:

Moles = mass / molar mass

The molar mass of C₂H₆ = 30 g/mol

Moles of C₂H₆ in 891.6 g = 891.6 / 30

Moles of C₂H₆ = 29.72 moles

Hence moles of CO₂ produced = 29.72 * 4/2 moles

Volume of 1 mole of CO₂ at STP = 22.4 liters

Volume of CO₂ produced = 29.72 * 4/2 * 22.4

Volume of CO₂produced = 1331.4 liters.

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1) We could use the bromine water test to tell the difference between the alkane and the alkene

2) We can use a detergent to wash a cloth that is contaminated by oil.

The term alkane has to do with a hydrocarbon that is composed of only a straight chain compound there are no multiple bonds in the alkane molecule and this is the difference between the alkane and the alkene. The alkene is composed of double bonds. The alkene compounds are able to decolorize bromine water while the alkanes can not.

If you have a contaminated cloth, you can be able to wash it by the use of a detergent because it is able to lift off the grease or oil by the use of the hydrophobic tail of the detergent.

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The percent yield of the water is 33.3%.

We know that the reaction that takes place between hydrogen and oxygen to give water is; [tex]2H_{2} (g) + O_{2} (g) ----- > 2H_{2}O(g)[/tex]. We now need to find the number of moles of hydrogen = 4 g/2 g/mol = 2 moles

Now;

If 2 moles of hydrogen reacts with 1 moles of oxygen

We can see that oxygen is the limiting reactant in this case.

1 mole of oxygen produces 2 moles of water

1.5 moles of oxygen produces 1.5 * 2/1

= 3 moles of water

Then the theoretical yield of water = 3 moles * 18 g/mol = 54 g

Percent yield = Actual yield / theoretical yield * 100/1

= 18/54 * 100/1

= 33.3%

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Taking into account the definition of Avogadro's Number, 4.33656×10²⁵ molecules are in 72 moles of CO₂.

Avogadro's Number is called the number of particles that make up a substance (usually atoms or molecules). This particles can be found in the amount of one mole of said substance.

Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.

Then you can apply the following rule of three: if 1 mole of CO₂ contains 6.023×10²³ molecules, 72 moles of CO₂ contains how many molecules?

amount of molecules of CO₂= (6.023×10²³ molecules × 72 mole)÷ 1 mole

amount of molecules of CO₂= 4.33656×10²⁵ molecules

Finally, 4.33656×10²⁵ molecules are present in 72 moles of CO₂.

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The equilibrium constant expression for the given reaction of methane with hydrogen sulfide will be:

[tex]k_c = \frac{[CS_2][H_2]^4}{[CH_4][H_2S]^2}[/tex]

Equilibrium constant expression is a ratio of the concentration of products to that of the concentration of the reactants. It is given by k[tex]_c[/tex].

In the given reaction, the product of the concentration of the reactants is

[tex]k_r[/tex] = [tex][CH_4] [H_2S]^2[/tex]

while the product of the concentration of the products is

[tex]k_p[/tex] = [tex][CS_2][/tex] [tex][H_2]^4[/tex]

According to the definition,

[tex]k_c = \frac{k_p}{k_r}[/tex]

[tex]\therefore k_c = \frac{[CS_2][H_2]^4}{[CH_4][H_2S]^2}[/tex]

Thus, the equilibrium constant expression is the ratio of the concentration of products and reactants.

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Following are reactant and product states and the  balanced chemical equation for the specified chemical reaction: NaOH(aq)+HCl(aq) → NaCl(aq)+H2O(l)

How do you balance a chemical equation?

Step 1: In both reactants and products, count each kind of atom.

Check whether there is exactly the same amounts of each atom on either side of the arrow. Otherwise, the equation is unbalanced, and you must move on to step 2.

Step 2: To increase the amount of atoms or molecules in the substances, place coefficients in front of the symbols or formulas as necessary. Make use of the fewest coefficients you can.  Chemical formulations should never have their subscripts changed. The substances involved in the reaction can be altered by changing subscripts. Only modify the coefficients.

Till the equation is balanced, go back and repeat steps 1 and 2.

Following are reactant and product states and the  balanced chemical equation for the specified chemical reaction:

In the reaction between sodium hydroxide and hydrogen chloride, sodium chloride and water are produced.

Hence,

NaOH(aq)+HCl(aq) → NaCl(aq)+H2O(l)

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Option D, A small, positive nucleus is mostly empty.

Rutherford's atomic version is the version which defined the atom as a tiny, dense, undoubtedly charged middle referred to as a nucleus, wherein almost all of the mass is focused, round which the light, bad constituents, referred to as electrons, flow into at a few distance, just like planets revolving across the Sun.

What is the Rutherford gold-foil test, A piece of gold foil became hit with alpha debris, that have a fantastic charge. Most alpha debris went proper through. This confirmed that the gold atoms had been normally empty space.

The 3 fundamental observations of the test had been: Most of the distance within the atom is empty. All the fantastic costs are focused in a completely small vicinity in the atom, referred to as the nucleus. The nucleus's length may be very small as compared to the scale of the atom.

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Answer:21.0 mL

shorten math

Relative and average atomic mass both describe properties of an element related to its different isotopes. Out of these two Relative atomic mas is more accurate. The correct option is option A.

Mass defines the quantity of a substance. It is measured in gram or kilogram. Average mass is the mass of atoms of an element that are isotopes. It can be calculated by multiplying mass of a isotope to natural abundance of that isotope.

Out of given compound, a polymer of ethene that is polyethylene will have highest molar mass. Polymer is a long chain of same or different monomer unit. Polymer has higher mass than the individual compound.

Therefore, option A is correct.

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Answer: polyethylene, a polymer of ethene

The molar mass of the gas is obtained as 32.1 g/mol.

The molar mass has to do with the mass one mole of a substance. We know that according to the question, we can be able to obtain the number of moles of the compound from the ideal gas equation.

This is how we are able to get the number of moles of the gas as 0.14 moles. Now we need to use the information that we have to get the molar mass of the gass.

Number of moles = mass/ molar mass

Molar mass = mass/Number of moles

Molar mass =  4.5g/0.14  moles

= 32.1 g/mol

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The wavelength of the cosmic ray when the frequency is 2.3 x 10^24 Hz is 1.304 x 10^-7 nm.

What is wavelength?

Wavelength in a wave is the distance between any given point on a wave and the same point on the adjacent wave that is crest to crest or trough to trough. It can be measured in the direction of the given wave.

The wavelength in nm of the cosmic ray can be calculated as,

λ = c / ν

where λ is the wavelength, ν is frequency in Hz or s^-1 and c is velocity of light.

λ = (3 x 10^8 m/s) / 2.3 x 10^24 Hz = 1.304 x 10^-16 m = 1.304 x 10^-7 nm.

Therefore, the wavelength of the cosmic ray when the frequency is 2.3 x 10^24 Hz is 1.304 x 10^-7 nm.

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Yes , the buoyant force from the atmosphere is greater on her car than your balloon .

So, She is correct.

Since, the density of helium is less than air, the buoyant force exerted by air is less than the weight of the balloon filled with helium, causing the balloon to float in the air and rise.

What do you mean by buoyant force?

The term light power alludes to the vertical coordinated force that a liquid applies on an item that is to some degree or totally drenched in the liquid. The light power emerges from contrasts in hydrostatic strain - the tension applied by a static liquid.

What is the buoyant force on a helium balloon in air?

Helium has 0.0114 pounds per cubic foot. For a one cubic foot helium filled balloon , gravity pulls the down on the helium with a force of 0.0114 pounds while the air pushes up with a force equal to the weight of the air of the helium displaced, or 0.0807 pounds.

        Hence, the buoyant force from the atmosphere is greater on the car than the balloon.

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