2Fe + 3CusO4 --> 3Cu + Fe2(SO4)3


Before Experiment

Mass of beaker = 106.3g

Mass of beaker and iron = 147.3

Mass of Iron = 41g


After Experiment

Mass of beaker and copper = 141.8g

Mass of Copper = 35.5

Theoretical yield =

Percent yield =

How do I find the last 2? Please somebody answer soon. Chemistry final is today this is the last thing I don't get...

The equilibrium constant (K) for the reaction at 25°C is approximately 1203.56.

To calculate the equilibrium constant (K) at 25°C for a reaction with a given standard Gibbs free energy change (ΔG°), you can use the following equation:

ΔG° = -RT ln(K)

where ΔG° = -4.22 kcal/mol, R is the gas constant (in kcal/mol·K), and T is the temperature in Kelvin.

1. Convert the temperature to Kelvin: T = 25°C + 273.15 = 298.15 K
2. Convert R to kcal/mol·K: R = 0.001987 kcal/mol·K
3. Rearrange the equation to solve for K: ln(K) = -ΔG° / (RT)
4. Substitute the values: ln(K) = -(-4.22 kcal/mol) / (0.001987 kcal/mol·K × 298.15 K)
5. Calculate ln(K) ≈ 7.094
6. Find K by taking the exponent: K = e^(7.094) ≈ 1203.56

The equilibrium constant (K) for the reaction at 25°C is approximately 1203.56.

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Answer:

Answer:

Physical change

Explanation:

while the wax is melting its still wax no chemical change

hope this helps :3

if it did pls mark brainliest

Even if all other elements are at or close to the ideal range of tolerance, the limiting factor principle states that too much or too little of any physical or chemical factor can restrict or prevent population increase. Some species have a remarkable capacity for population growth.

Even when all other elements are at or close to their ideal levels, too much or too little of any physical or chemical factor might stop population increase. This ecological principle, what is it?

Food, water, habitat, and mates are the typical ecological limiting variables. The carrying capacity of an environment will depend on the accessibility of these elements. Demand for food increases along with population growth. Given the scarcity of food, organisms will start vying for it.

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Based on the future value analysis, the Gold Oxide Drill should be selected for drilling wells.

To determine the type of drill that should be used based on future value analysis, we need to calculate the future value (total cost) for each drill type and select the one with the lowest future value.

The future value (FV) can be calculated using the formula:

FV = P * \((1 + r)^n\)

Where:

P = Monthly operation cost

r = Monthly interest rate (annual interest rate / 12)

n = Useful life in months

Let's calculate the future values for each drill type:

High-Speed Stainless Steel Drill:

P = $2,000

r = 0.12/12 = 0.01

n = 3 months

FV₁ = $2,000 * (1 + 0.01)³

     = $2,060.20

Gold Oxide Drill:

P = $1,500

r = 0.12/12 = 0.01

n = 6 months

FV₂ = $1,500 * (1 + 0.01)⁶

      = $1,556.52

Titanium Nitrite Drill:

P = $1,200

r = 0.12/12 = 0.01

n = 6 months

FV₃ = $1,200 * (1 + 0.01)⁶

       = $1,241.63

Now we compare the future values and select the drill with the lowest future value. In this case, the Gold Oxide Drill has the lowest future value, which means it would be the most cost-effective choice based on the future value analysis.

Therefore, based on the future value analysis, the Gold Oxide Drill should be selected for drilling wells.

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Answer:  

In this case the mass number would be 11.

Explanation:

The mass number of an element is the sum of the protons and neutrons. The number of neutrons for a given element is the only number that can change and still have the identity of the element stay the same, (because the atomic number is the number of protons).

Alveolar type II cells secrete a lipoprotein material called surfactant, whose primary function is to reduce the surface tension in the alveoli. Surfactant is a lipoprotein that consists mainly of dipalmitoyl phosphatidylcholine and some glycoprotein components.

Surfactant, also known as a surface-active agent, is a material, like a detergent, that when applied to a liquid, lowers its surface tension and increases the spreading and wetting capabilities of the liquid. Surfactants aid the dye's uniform penetration of the fabric during textile dyeing. By reducing the surface tension of the water, surfactants enable soap to combine with it. In addition to soaps and detergents, other products that use surfactants include lubricants, inks, anti-fogging agents, herbicides, adhesives, emulsifiers, and fabric softeners.

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Answer:

12.66g

Explanation:

42.2% of 30.0g

=42.2/100 * 30.0

=0.422*30.0

12.66g

More than one kind of pure form of matter combines forming a mixture.

A mixture is a combination of two or more pure substances that have been mixed physically and not chemically. The mixture can be homogeneous or heterogeneous depending on how well the substances are distributed in the mixture. Homogeneous mixture has the same composition and appearance throughout, while heterogeneous mixture has different composition and appearance. An example of a homogeneous mixture is saltwater, and an example of a heterogeneous mixture is soil.The components of a mixture can be separated by physical methods, which means that the components retain their properties. These physical methods include filtration, distillation, chromatography, and others. For instance, saltwater can be separated through evaporation by heating the mixture to evaporate the water, leaving behind the salt. Chromatography is another physical method that separates components of a mixture based on their chemical properties. It is used to separate dyes in ink or pigments in paint.In conclusion, more than one kind of pure form of matter combines forming a mixture. The mixture can be homogeneous or heterogeneous, and its components can be separated by physical methods.

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When the free energy of the reaction is lower in the products than it is in the reactants, the reaction is exergonic.

An exergonic reaction is a spontaneous chemical reaction that releases energy as a result of the products having lower free energy than the reactants. This means that the reaction can occur spontaneously without the need for additional energy input. The difference in free energy between the reactants and the products determines the amount of energy that is released during the reaction. In contrast, an endergonic reaction is a non-spontaneous chemical reaction that requires energy input to occur, and the free energy of the products is higher than that of the reactants.

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Fluorine.Accordingly the order of electronegativity of the given elements would be: Fluorine > Chlorine > Bromine > Iodine. ( Fluorine has the highest electronegativity.)

Fluorine and Chlorine (Atomic numbers 9 and 17) are situated in similar segment of the periodic table of elements. This truly intends that: fluorine and chlorine have similar number of electrons it their external shells. fluorine and chlorine have similar number of all out electrons.The elements fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At) are incandescent light. Incandescent light are profoundly reactive nonmetallic elements in bunch 17 of the periodic table. They have seven valence electrons, so they are very "energetic" to acquire one electron to have a full external energy level.

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Answer:

Sure, with what?

Ps- Just to increase word count

We're going to use 0.34 grams of nitrogen to resolve this. This would have a molar mass of, uh, 28 2 grams if we converted these two moles. Wu will then combine this as well. One-mole play is also a thing. three of H 2's moles. Grams of hydrogen are what we need. We will learn the answer here. Hydrogen weighs two grams per mole. Each gram weighs 0.501 grams. That would thus stand in for this. 2.34 grams of nitrogen would need to react with 0.501 grams of hydrogen to produce ammonia. 241=2 moles of nitrogen and 243=6 moles of hydrogen will be converted into 4 moles of ammonia. Nitrogen has a molar mass of 28 g/mol and hydrogen has a molar mass of 2 g/mol.

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The numerical part of the time conversion factor used to convert the answer to km/h2 is 3600.

This factor is obtained by converting the unit of time from seconds to hours. Since 1 hour equals 3600 seconds, multiplying the speed in m/s by 3600 will give the speed in km/h. This is a common conversion used in physics and engineering, where distances and velocities are often measured in different units. It is important to note that this conversion factor only applies if the initial unit of speed is meters per second (m/s). If the speed is given in other units such as miles per hour (mph), a different conversion factor would be needed. The numerical part of the time conversion factor to convert an acceleration value from meters per second squared (m/s²) to kilometers per hour squared (km/h²) is 1296. This factor is derived from the relationship between the two units: 1 m/s² = 3.6 km/h, and squaring both sides results in 1 m/s² = (3.6²) km/h² or 1 m/s² = 12.96 km/h². Hence, to convert a value in m/s² to km/h², you simply multiply the given acceleration by 1296.

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Answer:  The electron transition from 4p→2s  would produce light with a longer wavelength.

Explanation: The energy of an electron in a hydrogen atom is higher when it is at a higher energy level. When an electron undergoes transition it releases energy in the form of electromagnetic radiation or light. The higher the transition, the greater the energy.

Now we know that the energy released in the 4p→1s transition is greater than the energy released in the 4p→2s transition. And since energy is inversely proportional to wavelength, the wavelength of light in the latter case is more.

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To determine the pressure of the ammonia gas at a new volume and temperature, we can use the combined gas law, which states that the ratio of the initial pressure, volume, and temperature is equal to the ratio of the final pressure, volume, and temperature.

Using the combined gas law equation: (P1 * V1) / T1 = (P2 * V2) / T2

Given:

P1 = 585 torr (initial pressure)

V1 = 20.0 ml (initial volume)

T1 = 20.0 °C + 273.15 = 293.15 K (initial temperature)

V2 = 50.0 ml (final volume)

T2 = 50.0 °C + 273.15 = 323.15 K (final temperature)

We need to solve for P2 (final pressure).

Rearranging the equation, we have:

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

Substituting the given values into the equation:

P2 = (585 torr * 20.0 ml * 323.15 K) / (50.0 ml * 293.15 K)

Calculating this expression gives us the final pressure (P2) of the ammonia gas at the new volume and temperature.

In summary, using the combined gas law equation, we can determine the pressure of the ammonia gas at a new volume and temperature. By substituting the given values into the equation and performing the calculation, we can find the final pressure of the gas.

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Answer:

200 kPa

(it is actually 199.999, but rounding up it is 200)

hope this helps!

Answer:

1500 Torr is  about 200 kPa

B) 1 and 3

it's the right answer

Answer:

For 3rd question, the answer is option D

The molarity when .772 moles are dissolved in .500 Liters of water is 0.0015M. The molarity when .453 moles are dissolved in .450 Liters of water is 0.001M.

The term molarity is defined as the number of moles of solute dissolved in per litre of solution. The unit of molarity is mole, which is denoted by the symbol "M".

M = Number of moles of solute / litre in solution

1. Number of moles of solute = .772 moles

so, 0.772 / 500

= 0.0015 M

2. Number of moles of solute =  .453 moles

so, .453 / 450

= 0.001 M

Thus, The molarity when .772 moles are dissolved in .500 Liters of water is 0.0015M. The molarity when .453 moles are dissolved in .450 Liters of water is 0.001M.

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The length shows the distance between two points (symbol, L)

length measuring devices include a ruler, micrometer

The SI unit for length is m

The conversion of several units is:

1 km = 10³ m = 10⁵ cm

1 m = 10³ mm

38000 km = 3.8 x 10⁴ km = 3.8 x 10⁷ m

6.5 m = 6.5 x 10³ mm

4.3 ms = 4.3 x 10⁻³ s

0.02 km = 2 x 10⁻² x 10⁵ cm = 2 x 10³ cm

Answer:

double bond

Explanation:

it contains combinations

The building blocks of nucleic acids are monomers called "Nucleotides." Nucleic acids are RNA and DNA.

Nucleotides are the basic building blocks of nucleic acids (RNA and DNA). A nucleotide is made up of a sugar molecule, which is ribose in RNA or deoxyribose in DNA, linked to a phosphate group and a nitrogen-containing base. Adenine (A), cytosine (C), guanine (G), and thymine are the bases used in DNA (T). In RNA, the base uracil (U) replaces thymine. DNA and RNA are polymers composed of long chains of nucleotides.

Nucleotides play an important role in organism physiology as nucleic acid building blocks, chemical energy storage, carriers of activated metabolites for biosynthesis, structural moieties of coenzymes, and metabolic regulators.

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Answer:

3.01 * 10 ^ 23 atoms of Pt

Explanation:

1 mole of Pt contains 6.02 * 10 ^ 23 atoms of Pt

195.084 g of Pt has  6.02 * 10 ^ 23 atoms of Pt  

97.6 g = .5 moles so  

97.6 g of Pt has 3.01 * 10 ^ 23 atoms of Pt

The 97.6 grams of platinum contains \(3.011\times 10^{23}\) atoms.

Given:

The mass of platinum = 97.6 grams

To find:

The number of platinum atoms in 97.6 grams.

Solution:

Mass of platinum = 97.6 g

Moles of platinum =\(\frac{97.6g}{195.084 g/mol}=0.500 mol\)

According to the mole concept:

1 mole = Avogadro Number = \(N_A=\) \(6.022\times 10^{23} atoms/ molecules/ions\)

The number of platinum atoms in 0.500 moles of platinum:

\(=0.500\times 6.022\times 10^{23} atoms\\\\=3.011\times 10^{23} atoms\)

The 97.6 grams of platinum contains \(3.011\times 10^{23}\) atoms.

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Fluorine (F2) is the halogen that reacts first with calcium.

The reaction between calcium and a halogen results in the formation of a calcium halide. The balanced equation for the reaction is:

Ca + X2 → CaX2

where X represents the halogen.

From the given information, we know that 8 grams of calcium react with the halogen, producing 22.2 grams of calcium halide. Therefore, we can calculate the amount of halogen consumed in the reaction as follows:

22.2 g CaX2 × (1 mol CaX2 / 111 g CaX2) × (1 mol X2 / 1 mol CaX2) × (254 g X2 / 1 mol X2) = 46.3 g X2

where 111 g/mol is the molar mass of CaX2, and 254 g/mol is the molar mass of X2.

Since the atomic masses of the halogens are: F=19, Cl=35.5, Br=80, and I=127, it is clear that the halogen with the smallest atomic mass will require the least amount of reactant to produce 46.3 g of X2. Therefore, fluorine (F2) is the halogen that reacts first with calcium.

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34%  is the percent by mass of nitrogen in the following fertilizers. It represents the amount of solute contained in a mass m of solution.

The mass percent might be used to denote a degree. Furthermore, it defines the element during a certain mixing. The solution mixture is frequently defined in terms of mass percentage.

It represents the amount of solute contained in a mass m of solution. The quantity of solutes can be stated in terms of mass or moles. We will study the mass percent formula using numerous solved numerical examples in this post.

molar mass of nitrogen = 28g

molar mass of urea= 60.06

mass percentage =(28/  60.06)×100 = 34%

Therefore, 34% is the percent by mass of nitrogen in the following fertilizers.

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Answer:

Atomic Particles

Atoms consist of three basic particles: protons, electrons, and neutrons. The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged).

The shielding effect is not influenced by electronic configuration because the shielding effect indicates a blockage in the attraction. Conversely, electronic configuration refers to the arrangement of electrons.

The shielding effect can be defined as 'blocking valence shell electron (e-) attraction', which is due to the shells located between the nucleus and the valence shells.

Conversely, electronic configuration refers to the differential arrangement of the e- in different energy levels around a given nucleus.

Electronic configurations are used to represent one or more e- moving independently in a given orbital, thereby evidencing how many e- an atom contains and how they are positioned in their corresponding shells.

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