Assume that 0.491 g of diborane is combusted in a calorimeter whose heat capacity (Ccalorimeter) is 7.854 kJ/°C at 19.63°C. What is the final temperature of the calorimeter?

:Response: 2.21 atm The ideal gas law says that the pressure of a gas is equal to the quantity of the gas times the universal gas constant (R) times the temperature (T) times the volume (V) divided by the number of moles in the gas.

Consequently, we may apply the following equation to this issue: P = (n*R*T)/V. We may get the pressure of the gas in atmospheres by using the following formula, where n is the number of moles, V is the volume, T is the temperature, and R is the universal gas constant.

P is equal to 2.21 atm or (3.43 mol*0.0821 L*atm/mol*K*492.15 K)/27.17 L. As a result, choice A) 2.21 atm is the right one.

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The accepted value for the molar volume of an ideal gas at STP is 22.4 L/mol.

To calculate the molar volume of hydrogen gas at STP, we can use the ideal gas law equation, PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.

From the given information, we have:

Pressure (P) = 103.40 kPa

Volume (V) = V2 from calculation 2 above (in liters)

Moles (n) = moles from calculation 1 above

Temperature (T) = 25.8 °C + 273.15 = 298.95 K (mean temperature)

Molar volume = V / n

Molar volume = V2 / moles

The accepted value for the molar volume of an ideal gas at STP is 22.4 L/mol. To calculate the percent error, we can use the formula:

Percent error = (|experimental value - accepted value| / accepted value) * 100

Percent error = (|molar volume - 22.4 L/mol| / 22.4 L/mol) * 100

Possible sources of error in this experiment may include experimental inaccuracies such as: Inaccurate pressure measurements due to instrumental limitations or calibration issues. Temperature fluctuations during the experiment, leading to variations in the calculated values. Assumptions of ideal gas behavior may not hold completely. Systematic errors in the equipment used, such as leaks or variations in volume measurements. It's important to note that this is a hypothetical experiment based on the given information, and the actual sources of error may vary depending on the experimental setup and procedure.

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dm³ = cubic decimeter = LITER

chatgpt

math for calculating the concentration of a hydrated compound in g/dm³:

Concentration (g/dm³) = Weight of compound (g) / Volume of solution (dm³)

For example, let's say you have a solution with a weight of the hydrated compound of 25 grams and a volume of 0.5 dm³:

Concentration = 25 g / 0.5 dm³

Concentration = 50 g/dm³

So, the concentration of the hydrated compound in this example is 50 g/dm³

To calculate the concentration of a hydrated compound in g/dm3, you need to know the molar mass of the compound. You can then use the following formula:

Concentration (g/dm3) = (mass of solute (g) / volume of solution (dm3))

To calculate the mass of solute, you can use the following formula:

Mass of solute (g) = number of moles x molar mass

You can then substitute this value into the first formula to calculate the concentration in g/dm3.

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The student should use 687 g of the solution.

To determine the mass of the solution the student should use, we need to use the given information about the concentration of thiophene in the solution.

First, we can calculate the mass of thiophene in the solution using the given concentration:

0.20 kg x 27.8% = 0.0556 kg thiophene

Next, we can use the mass of thiophene in the solution to calculate the mass of benzene in the solution:

0.20 kg - 0.0556 kg = 0.1444 kg benzene

Now we can use the mass of thiophene in the solution to calculate how much solution is needed to obtain 95 g of thiophene:

0.0556 kg thiophene ÷ 0.95 = 0.0585 kg solution

Finally, we convert the mass of solution to grams:

0.0585 kg x 1000 g/kg = 58.5 g

Since the available solution is more than 58.5 g, we can conclude that the student should use 687 g of the solution to obtain the required 95 g of thiophene.

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Explanation:

We determine the mass of the helium gas,

mHe, that is required to produce the given sample. We do this by first considering that neon gas behaves ideally with the given conditions, such that we use the equation

PV=nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature. Moreover, we express the number of moles as:

n= mMW

where 'MW is the molar mass. We use the following values for the variables:

P =255atm

V =100.0 L

R = 0.08206Latm/molK

T = 25 + 273= 298 K

MW = 4.003 g/mol

We proceed with the solution.

We would need a total of 4.17×103 grams of helium gas.Now, we determine the mass when we are going to consider oxygen gas. We would be applying the same working equation but we use a different value for MW, wherein we have

MW=16.00g/mol

We proceed with the solution and plug in the variables

We would need a total of 1.67×10^4 grams of oxygen gas.

(Hopefully this helps u out!)

Answer: 2.31 L

Explanation:

charles law  v2= V1 x T2/T1

temperature must be in Kelvin

V2=2.5 X 298.15 / 323.15 =2.31 L

Explanation:

For dissolving dry mortar on floor tiles, you can use concrete and mortar dissolver. You can find this product at your local hardware store or online12.

For removing KMnO stains, you can use vinegar. Mix vinegar with water and spray or pour it on the tile surface. Let the vinegar water set in for a few minutes, then sponge the entire area to get it as clean as possible. Next, use a razor blade or scraper to peel up the mortar. Be careful not to gouge or scratch the tiles3.

KMnO is potassium permanganate. it makes water drinkable if it's polluted

For drying acid anhydrides, you can use calcium chloride. Calcium chloride is a hygroscopic substance that absorbs moisture from the air and can be used as a desiccant.

desiccants keeps things dry so they last longer like food & clothes

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The mass percentage is a way which express the concentration of a solution. The percent by mass of oxygen in CH3OH is 50.0 .

Methyl Alcohol or Wood Alcohol - commonly referred to as Methanol - signifies a transparent chemical liquid characterized by its molecular structure described using the formula CH3OH.

Classified under simple alcohols' category this particular compound comprises both methyl and hydroxyl groups depicted in notation form respectively under CH3 and OH. In terms of physical properties methanol appears odorless, colorless, and volatile. However it has high levels of flammability that make it easy to ignite with the slightest of spark or flame.

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Answer:

approx 7.41 sextillion

Explanation:

One mole of any substance contains 6.022 x 10^23 particles (Avogadro's Number). Therefore, 1 mole of water contains 6.022 x 10^23 water molecules.

To find how many moles are represented by 7.43 x 10^18 molecules of water, we can divide 7.43 x 10^18 by Avogadro's Number:

7.43 x 10^18 / 6.022 x 10^23 = 0.0123 moles of water

Now, we can use this to find the number of water molecules:

0.0123 moles x 6.022 x 10^23 molecules/mole = 7.41 x 10^21 molecules of water

Therefore, 7.43 x 10^18 molecules of water represent 7.41 x 10^21 molecules or approximately 7.41 sextillion (7,410,000,000,000,000,000) molecules of water.

11. The concentration of C is 200

12. The concentration of B is 0.4

Equilibrium constant, K is defined as follow:

nReactant ⇌ mProduct

Equilibrium constant, K = [Product]ᵐ / [Reactant]ⁿ

With the above formula, we can obtain the equilibrium concentration of the missing substance as follow:

11. For concentration of C

K = [C] / [A][B]

20 = [C] / (2 × 5)

20 = [C] / 10

Cross multiply

[C] = 20 × 10

Concentration of C, [C] = 200

12. For concentration of B

K = [C] / [B]

10 = 4/ [B]

Cross multiply

10 × [B] = 4

Divide both sides by 10

[B] = 4 / 10

Concentration of B, [B] = 0.4

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Complete question:

Find the concentration of the missing substance

11) A + B = C

K = 20

[A] = 2

[B] = 5

[C] =?

12) A(s) + B(ag) = C(g)

K = 10

[C] = 4

[B] = ?

The displacement of the balloon at an altitude where the atmospheric pressure is 10.82 inHg would be 9,603.7 L

The displacement of a balloon is determined by the volume of air that it displaces.

Apply Boyle's as follows;

V₁P₁ = V₂P₂

V₂ = (V₁P₁) / P₂

Where;

The final volume is calculated as follows;

V₂ = (3473 x 29.92) / (10.82)

V₂ = 9,603.7 L

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Note that the based on the graph of  the statement that is most likely true, is "Caterpillar-resistant corn, no pesticide, no refuge field." (Option C)

In discrete mathematics, and more particularly in graph theory, a graph is a structure consisting of a set of objects, some of which are "related" in some way.

The items correspond to mathematical abstractions known as vertices, and each pair of connected vertices is known as an edge.

Graphs are a popular way to visually depict data connections. A graph's objective is to convey facts that is too many or intricate to be fully expressed in words and in less space.

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Full Question:

Below is a graph of the number of caterpillars in the corn field over 30 years. Which statement is most likely true?

answer choices

Normal corn, with insecticide, no refuge field.

Normal corn, with insecticide, with refuge field.

Caterpillar-resistant corn, no pesticide, no refuge field.

Caterpillar-resistant corn, no pesticide, with refuge field.

The final volume when 0.694 L of a 36.2% (m/v) solution is diluted to 20.3% (m/v) is approximately 1236 mL.

To calculate the final volume in milliliters when a solution is diluted, we can use the formula:

(V1)(C1) = (V2)(C2),

where V1 is the initial volume, C1 is the initial concentration, V2 is the final volume, and C2 is the final concentration.

In this case, we have:

V1 = 0.694 L (initial volume)

C1 = 36.2% (m/v) (initial concentration)

C2 = 20.3% (m/v) (final concentration)

We need to solve for V2, the final volume.

Using the formula, we can rearrange it to solve for V2:

V2 = (V1)(C1) / C2

Substituting the given values:

V2 = (0.694 L)(36.2% (m/v)) / 20.3% (m/v)

Calculating this expression, we find:

V2 = (0.694 L)(0.362) / 0.203

V2 = 1.23628 L

Since the question asks for the final volume in milliliters, we convert the result to milliliters by multiplying by 1000:

V2 = 1.23628 L × 1000 mL/L

V2 ≈ 1236 mL

Therefore, the final volume when 0.694 L of a 36.2% (m/v) solution is diluted to 20.3% (m/v) is approximately 1236 mL.

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In order for a model of the universe to be useful, it should be able to explain and account for various observations and phenomena such as cosmic microwave background radiation and large scale structure of the universe.

Cosmic Microwave Background Radiation: The existence of the cosmic microwave background radiation (CMB) is one of cosmology's most important observations. The afterglow of the Big Bang is thought to represent this radiation, a weak energy glow that penetrates the entire cosmos. The origin, properties, and dispersion of the CMB should all be explicable by a suitable universe model. It should take into consideration the minor anisotropies (variations) and isotropy (uniformity) seen in the CMB, which are vital for understanding the origins of the universe.

The distribution of galaxies and galaxy clusters on a massive scale is referred to as the largescale structure of the universe, which is another significant observation. We notice that matter is not evenly dispersed throughout the universe, but instead forms a complicated pattern of filaments, voids, and clusters. The evolution of large scale structures, including the mechanisms that created galaxies, galaxy clusters, and the cosmic web, should be explicable by a meaningful universe model. The observed characteristics, such as the concentration of matter and the expansion of space, should also be taken into account.

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The transition that involves the greatest change in energy is the transition shown by (f)

When an electron moves from one energy level to another, this is referred to as an energy transition in an atom. An atom's electrons can be found in various orbitals or energy levels, and because these levels are quantized, only specific values are permitted.

The transition in f involves a movement from n = 1 to n =4 that shows a great involvement of energy for such to occur.

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Both models represent nuclear reactions that produce energy, but Model 1 is most likely to occur in the sun, while Model 2 is most likely to occur in nuclear power plants.

option B is correct.

Based on the given models, the statement that is most likely correct is: Both models show reactions which produce energy in the sun.

Model 1 represents a type of nuclear reaction called fusion, which is the process of combining two atomic nuclei to form a heavier nucleus. Fusion reactions occur naturally in stars like the sun, where the high temperatures and pressures allow atomic nuclei to overcome their natural repulsion and fuse together. The energy released by fusion reactions in the sun is what makes it shine and provides the energy for life on Earth.

Model 2 represents a type of nuclear reaction called fission, which is the process of splitting a heavy atomic nucleus into two or more lighter nuclei. Fission reactions are typically used in nuclear power plants to generate energy, where the heat produced by the fission reactions is used to produce steam and generate electricity. both models represent nuclear reactions that produce energy, but Model 1 is most likely to occur in the sun, while Model 2 is most likely to occur in nuclear power plants.

so, the correct option B

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Answer:

The mass of all atoms is compared to the carbon atom

To get the formula of an ionic compound from its name, we need to identify the ions present and balance their charges to determine the subscript of each ion.

Ionic compounds are composed of positively charged ions (cations) and negatively charged ions (anions). The name of an ionic compound provides information about the ions present in the compound.

In the case of calcium chloride, the name tells us that the compound contains a calcium ion (Ca²⁺) and a chloride ion (Cl⁻). To write the formula of the compound, we need to balance the charges of the ions. Since the calcium ion has a charge of +2 and the chloride ion has a charge of -1, we need two chloride ions to balance the charge of one calcium ion. Therefore, the formula of calcium chloride is CaCl₂.

To determine the formula of other ionic compounds from their names, we need to follow the same process of identifying the ions present and balancing their charges. For example, in sodium sulfide (Na₂S), the name tells us that the compound contains a sodium ion (Na⁺) and a sulfide ion (S²⁻). To balance the charges, we need two sodium ions for every one sulfide ion, so the formula of sodium sulfide is Na₂S.

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Answer:

A mixture of ethane and ethene occupies 40 litre at 1.00 atm and at 400 K.The mixture reacts completely with 130 g of O2 to produce CO2 and H2O . Assuming ...

Missing: 32 ‎Br2

According to Dalton's law of partial pressures, the total pressure by a mixture of gases is equal to the sum of the partial pressures of each of the constituent gases. The partial pressure is defined as the pressure each gas would exert if it alone occupied the volume of the mixture at the same temperature. The Law of Partial Pressures is commonly applied in looking at the pressure of a closed container of gas and water. The total pressure of this system is the pressure that the gas exerts on the liquid. The gas is made up of whatever sample of gas there is plus the evaporated water. Dalton's law of partial pressures, Pt = P1 + P2 + ..., says that the total pressure of a gas mixture is the sum of the partial pressures of constituent gases. Dalton's law states that the total pressure of a gas is the sum of the individual pressures of all the gas molecules in the container. In other words, it's the average pressure exerted by all the gas particles in a given system.

Answer:

Generally, A surface or object with a darker cover/color absorbs more heat.

Explanation:

Lets break this down:

The color white does not absorb any colors or light, it only reflects, therefore it takes in less heat.

If you had an assortment of cans ranging from different colors, but progressively getting darker, you will observe a difference in how much heat each will absorb. Darker colors, especially black, take in more heat because they are taking in more light. Instead of reflecting colors, it absorbs them. Because of this it is taking in much more heat than the other colors.

This is also why you see more white cars than black ones. In summer the white cars won't get as hot/overheated as a black/darker color car.

The molecule must possess dipolar bonds, exhibit suitable vibrational frequencies, and be in a form that can be analyzed using IR spectroscopy in order to be studied in an IR spectrum.

To study a molecule in an infrared (IR) spectrum, several criteria need to be considered. Firstly, the molecule should have a dipole moment, meaning it must have a separation of positive and negative charges within the molecule.

This is because IR spectroscopy primarily detects vibrations of covalent bonds, which are associated with changes in dipole moment.Additionally, the molecule should have covalent bonds that can undergo vibrational modes within the range of the instrument. IR spectroscopy typically covers the frequency range of 4000 to 400 cm⁻¹, which corresponds to the energies of molecular vibrations.

The molecule should also be able to be vaporized or dissolved in a suitable solvent to generate a homogeneous sample for analysis. Gaseous or liquid samples are commonly used in IR spectroscopy.

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Answer:

41826.05 Calories

Explanation:

1 J = 0.239006 Calories

175 KJ

= 175 x 1000 J

= 175000 J

175000 J to Calories

= 175000 x 0.239006

= 41826.05 Calories

Answer: 41.8

Explanation:

Acellus verified ✅

Answer:

12 degrees

Explanation:

The correct statement about ionic crystals is Alternating layers of positive and negative ions form the ionic crystal.

They are ions bonded by electrostatic attraction into a regular lattice to form solids.

It should be noted that the Ionic compounds are not molecules but crystals however there are many alternating positive and negative ions which are seen to be  bounded together in a matrix to form crystals. The positive metal ion of an ionic compound is identified first, and then the negative nonmetal ion. Solids with high melting and boiling points are ionic compounds.

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In 0.8291 moles of hexane ([tex]C_6H_1_4[/tex]) there are 20.8 liters in 0.8291 moles of hexane at room temperature and atmospheric pressure.

To determine the number of liters in 0.8291 moles of hexane (C6H14), we need to use the ideal gas law equation:

PV = nRT

where:

P = pressure (atm)

V = volume (L)

n = moles of gas

R = gas constant (0.0821 L*atm/mol*K)

T = temperature (K)

We need to rearrange this equation to solve for V:

V = nRT/P

First, we need to calculate the number of moles of hexane:

n = mass/molar mass

The molar mass of hexane (C6H14) is:

6(12.01 g/mol) + 14(1.01 g/mol) = 86.18 g/mol

n = 0.8291 moles

Next, we need to convert the temperature to Kelvin. Assuming room temperature (25°C or 298 K):

T = 298 K

Finally, we need to assume a pressure value. Let's assume atmospheric pressure (1 atm).

P = 1 atm

Now we can plug in the values and solve for V:

V = (0.8291 mol)(0.0821 L*atm/mol*K)(298 K)/(1 atm)

V = 20.8 L

Therefore, there are 20.8 liters in 0.8291 moles of hexane at room temperature and atmospheric pressure.

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Answer:

[OH⁻] = 8.33 * 10⁻¹²

Explanation:

We know that [OH⁻] * [H⁺] = 10⁻¹⁴

plugging the value of [H⁺]

[OH⁻] * 1.2 * 10⁻³ = 10⁻¹⁴

[OH⁻] = 10⁻¹⁴ * (10³/1.2)

[OH⁻] = 833.3 * 10⁻¹⁴

[OH⁻] = 8.33 * 10⁻¹²