Calculate the standard enthalpy change of reaction for b. 4HNO3(g) + 2H2O(g) → 2N2H4(g) + 7O2(g)

Answer:

Explanation:

The formula of the compound in which the atom combining ratios are:

chlorine : oxygen : fluorine = 1:3:1 is ClO3F i.e. perchloryl fluoride.

The chemical formula is define as a method of providing information about chemical properties of atoms that make a particular chemical compound or molecule by chemical name and symbols.

There are mainly three types of chemical formula

Thus, the formula of the compound in which the atom combining ratios are:

chlorine : oxygen : fluorine = 1:3:1 is ClO3F i.e. perchloryl fluoride.

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The equilibrium constant, K, for the given reaction at 450 K is 4.33.

The equilibrium constant, K, for the given reaction is given by the Expression:

K = [Nocl]^2 / ([NO]^2 [Cl2])

Where [NO], [Cl2], and [Nocl] are the equilibrium partial pressures of the Respective gases.

At equilibrium, the partial pressures of NO, Cl2, and Nocl are 0.075 atm, 0.191 atm, and 0.35 atm, respectively.

Substituting these values in the expression for K, we get:

K = (0.35)^2 / ((0.075)^2 (0.191))

K = 4.33

Therefore, the equilibrium constant, K, for the given reaction at 450 K is 4.33.

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The final volume of the ladybug's prison is approximately 0.4 liters.

To determine the final volume of the ladybug's prison, we can use Boyle's Law, which states that the pressure and volume of a gas are inversely proportional at constant temperature. The equation for Boyle's Law is:

P1 * V1 = P2 * V2

Where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume, respectively.

In this scenario, the initial volume (V1) is given as 0.5 L, and the initial pressure (P1) is 1 atm. The final pressure (P2) is 1.25 atm. We need to find the final volume (V2).

Plugging the given values into the equation, we have:

1 atm * 0.5 L = 1.25 atm * V2

Simplifying the equation, we find:

0.5 L = 1.25 atm * V2

Dividing both sides of the equation by 1.25 atm, we get:

0.5 L / 1.25 atm = V2

V2 ≈ 0.4 L

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Answer:

The number of molecules of water us 1.50× 10²⁵ molecules

Explanation:

From N=nL

where L =avogadro number ( 6.02× 10^²³ entities)

The number of the molecules of water =1

n (amount of substance)=25 moles

hence (N) = 25×1×6.02×10^²³

=1.50×10²⁵ molecules of H2O

Answer:

the molecules . . . separate and eventually evaporate into gas.

Explanation:

Answer:

around march

Explanation:

Answer:

full moon i beleive if this is right would greatly apprecitate brainliest.      

Explanation:

This technique has been used to identify the presence of gases such as oxygen, methane, and carbon dioxide in the atmospheres of exoplanets.  

i) To estimate the frequency of the violet (leftmost) emission, we can use the equation v = c/λ, where v is frequency, c is the speed of light (3.00 x 10^8 m/s), and λ is the wavelength of the emission in meters. The wavelength of the violet emission is 400 nm or 400 x 10^-9 m, so the frequency can be calculated as v = (3.00 x 10^8 m/s) / (400 x 10^-9 m) = 7.50 x 10^14 Hz.

ii) To estimate the energy of the violet emission, we can use the equation E = hv, where E is energy, h is Planck's constant (6.63 x 10^-34 Js), and v is frequency in Hz. Substituting the frequency calculated in part (i), we get E = (6.63 x 10^-34 Js) x (7.50 x 10^14 Hz) = 4.97 x 10^-19 J.

b. The spectral lines are produced by the electrons within the atoms of this element, which can absorb or emit specific amounts of energy to move between different energy levels. These energy transitions result in the emission or absorption of photons with specific wavelengths and frequencies, giving rise to the observed emission spectrum.

c. The violet emission line represents the photon with the most energy since it has the shortest wavelength (400 nm) and highest frequency (7.50 x 10^14 Hz) among the lines shown. This highest energy does not necessarily represent the energy of the valence electrons, but rather corresponds to the specific energy transitions occurring within the atoms of the element.

d. Emission spectra can be used to determine the gases present in the atmosphere of a far-away planet by analyzing the specific wavelengths of the emitted or absorbed light from the planet. Each gas has a unique emission or absorption spectrum, allowing scientists to identify the gases present in the planet's atmosphere.

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Answer: d

Explanation:because it makes sence i think

Answer:

Water has a molar mass of 18.015 g/mol . This means that one mole of water molecules has a mass of 18.015 g . So, to sum this up, 6.022⋅1023 molecules of water will amount to 1 mole of water, which in turn will have a mass of 18.015 g . 2.7144moles H2O ⋅6.022⋅1023molec.

Explanation:

Answer:

I hope you do well on the test good luck

Explanation:

Answer:

\(em = mgh\)

given

Answer:

em=gm  given

Explanation:

Answer:

The concentration of the nitric acid (HNO3) solution is 72 M.

Explanation:

To determine the concentration of the nitric acid solution, we can use the concept of stoichiometry and the equation of the neutralization reaction between nitric acid (HNO3) and sodium hydroxide (NaOH):

HNO3 + NaOH → NaNO3 + H2O

The balanced equation shows that the molar ratio between HNO3 and NaOH is 1:1. This means that 1 mole of HNO3 reacts with 1 mole of NaOH.

Given:

Volume of HNO3 solution = 10.0 ml

Volume of NaOH solution = 3.6 ml

Molarity of NaOH solution = 0.2 M

To find the concentration of the HNO3 solution, we need to calculate the number of moles of NaOH used in the neutralization reaction:

moles of NaOH = volume of NaOH solution * molarity of NaOH solution

= 3.6 ml * 0.2 M

= 0.72 mmol (millimoles)

Since the molar ratio between HNO3 and NaOH is 1:1, the number of moles of HNO3 in the solution is also 0.72 mmol.

Now, we can calculate the concentration of the HNO3 solution using the formula:

concentration (in M) = moles of solute / volume of solution (in L)

concentration = 0.72 mmol / 0.010 L

= 72 mmol/L

= 72 M

Therefore, the concentration of the nitric acid (HNO3) solution is 72 M.

Systematic name : 5-chloro-2-pentanol (or 5-chloropentan-2-ol)

Systematic name : 1,2-difluoro-3-heptanol   (or 1,2-difluoroheptan-3-ol).

The active site of numerous reactions is the hydroxyl group (OH). Pentyl butyrate, which has an apricot-like aroma, is the ester that results from the reaction of 1-pentanol and butyric acid. Amyl acetate, also known as pentyl acetate, is the ester that is created when 1-pentanol and acetic acid are combined.

A research evaluating the efficacy of diesel fuel blends with different amounts of pentanol as an additive was done in 2014. Higher pentanol concentrations resulted in higher gaseous emissions at the expense of lower particulate emissions.

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Chlorofluorocarbons (CFCs) are man-made chemicals containing chlorine and fluorine that cause ozone molecules to break down. Thus, option B is the answer.

Chlorofluorocarbons are non-toxic, synthetic compounds that contain atoms of Chlorine, Fluorine and Carbon. They are commonly used in the manufacture of aerosol sprays and are also used as solvents and refrigerants. CFCs were first introduced in 1928 by General Motors Company for its refrigerators.

While CFCs are very safe to use in most applications and are stable in the lower atmosphere, these chemicals when released to the upper atmosphere can cause significant reactions. CFCs when released into the upper atmosphere can lead to the destruction of the ozone molecules followed by the release of the UV radiation into the atmosphere.

Thus, CFCs are man-made chemicals which cause ozone molecules to break down.

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Based on the given data, the relationship between rate and concentration is exponential.

A proposed rate law for the reaction based on the given data is:

Collision theory suggests that the rate of a chemical reaction is proportional to the frequency and energy of collisions between the reactant molecules.

As the concentration of iodate ions decreases, the frequency of collisions between reactant molecules decreases, which leads to a decrease in the rate of the reaction.

At higher temperatures, the kinetic energy of the reactant molecules increases, which increases the frequency and energy of collisions between reactant molecules.

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Answer:

These batteries are constructed of several single cells connected in series each cell produces approximately 2.1 volts. ... A battery cell consists of two lead plates a positive plate covered with a paste of lead dioxide and a negative made of sponge lead, with an insulating material (separator) in between.

Answer:

6 moles

Explanation:

Looking at the coefficient of the reactants/ products, the ratio of Fe consumed to Fe₂O₃ produced is 4: 2.

Fe: Fe₂O₃

= 4: 2

= 2: 1

This means that the amount of Fe₂O₃ produced is half the amount of Fe consumed, in terms of moles.

Given that 12 moles of Fe are consumed,

amount of Fe₂O₃ produced

= 12 ÷2

= 6 moles

Answer:

see explanation

Explanation:

4Fe +3O2----------2Fe2O3

if we have 12 moles of Fe, we have 3X4 mole of Fe

but since 4 moles of Fe produce 2 moles of Fe2O3,6 then 3X 4 moles of Fe produce 3X2 moles of Fe2O3 or

6 moles.

One mole of Fe2O3 has a molar mass of (56X2) +(3X16) = 112+48 = 160

One mole Fe2O3 has a molar mass of 160 gm

6 moles of Fe2O3 have a mass of 160 X6 =960 gm

Our sample has 1.626 g, and 1.060 g is As.

Amount of Oxygen = 1.626 - 1.060 = 0.566 g O

Part 1) We must calculate the number of moles of each element:

Please, get the atomic masses of As and O from the periodic table.

For As) 1.060 g As x (1 mole As/74.92 g) = 0.01415 moles As

For O) 0.566 g O x (1 mole O/16.00 g) = 0.03537 moles O

Part 2) We need to calculate the subindexes we put in the empirical formula:

Let's divide the number of moles by the smallest one of them

For As) 0.01415 moles As/0.01415 moles As = 1

For O) 0.03537 moles O/0.01415 moles As = 2.5

We convert these 2 values into whole numbers, multiplying by 2:

1 x 2 = 2

2.5 x 2 = 5

The empirical formula: As2O5

The quantity of heat required to convert the ice to water is 5048.4 J.

The quantity of heat required to convert the ice to water is calculated as follows;

Q = n∆Hfus

where;

The number of moles of the ice is calculated as follows;

n = m/M

where;

M is molar mass of water (H2O) = 18 g/mol

n = 15.1/18

n = 0.84 mole

Q = 0.84 x 6.01 x 10³

Q = 5048.4 J

Thus, the quantity of heat required to convert the ice to water is 5048.4 J.

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When n=2 this means that the electron is located on the second energy level. We then calculate the momemtum quantum number which is n-1. In this case the momentum quantum number is 1 (l=1). The magnetic quantum number ml is given by -l to +l. Therefore when n=2, the ml= -1,0,+1

When n=6 and l=5, ml would have values -5 to +5.

ml values are: -5,-4,-3,-2,-1,0,1,2,3,4,5

Answer:

The physical and human forces that work in combination to form and transform the world, for example, erosion, the water cycle, migration or urbanisation. Geographical processes can operate within and between places.

We can see here that one use of ethanol based on its volatile nature is as a fuel additive.

Ethanol, also known as ethyl alcohol or grain alcohol, is a volatile, colorless liquid that belongs to the alcohol chemical group. It is produced through the fermentation of sugars by yeast or other microorganisms. Ethanol has a wide range of applications, including industrial, fuel, and recreational uses.

Ethanol is a renewable resource that can be used to replace gasoline in some applications. It is also less polluting than gasoline, and it can help to reduce greenhouse gas emissions.

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3.73 × 10⁻¹²J/mol is the energy of a single UV photon and 1 mole of UV photons having a wavelength of 32 nm.

A photon is a microscopic particle made up of electromagnetic radiation waves. Maxwell demonstrated that photons are merely electric fields moving through space. Photons move at the speed of light and have no charge or rest mass.

According to Planck's Law, electromagnetic radiation from heated bodies is not released in a continuous stream but rather as discrete energy units called quanta, the size of which depends on a fundamental physical constant.

E .. hc/λ

λ is 32nm

h is 6.626*10⁻³⁴Js

c is 3 × 10⁸m/s

E of single photon will be (6.626*10-34 * 3*10⁸)/32*10⁹

i.e. 0.62*10⁻³⁵J

1 mol UV photons = 6.022 × 10^23 UV photons.

E of 1 mole = E of single photon *6.022 × 10²³

                   = 0.62*10⁻³⁵ * 6.022 × 10²³

                  = 3.73*10⁻¹²J/mol

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The energy of combustion for one mole of butane to be approximately 2888.81 kJ/mol.

To calculate the energy of combustion for one mole of butane (C4H10), we need to use the information provided and apply the principle of calorimetry.

First, we need to convert the mass of the butane sample from grams to moles. The molar mass of butane (C4H10) can be calculated as follows:

C: 12.01 g/mol

H: 1.01 g/mol

Molar mass of C4H10 = (12.01 * 4) + (1.01 * 10) = 58.12 g/mol

Next, we calculate the moles of butane in the sample:

moles of butane = mass of butane sample / molar mass of butane

moles of butane = 0.367 g / 58.12 g/mol ≈ 0.00631 mol

Now, we can calculate the heat released by the combustion of the butane sample using the equation:

q = C * ΔT

where q is the heat released, C is the heat capacity of the calorimeter, and ΔT is the change in temperature.

Given that the heat capacity of the bomb calorimeter is 2.36 kJ/°C and the change in temperature is 7.73 °C, we can substitute these values into the equation:

q = (2.36 kJ/°C) * 7.73 °C = 18.2078 kJ

Since the heat released by the combustion of the butane sample is equal to the heat absorbed by the calorimeter, we can equate this value to the energy of combustion for one mole of butane.

Energy of combustion for one mole of butane = q / moles of butane

Energy of combustion for one mole of butane = 18.2078 kJ / 0.00631 mol ≈ 2888.81 kJ/mol

Therefore, the energy of combustion for one mole of butane is approximately 2888.81 kJ/mol.

In conclusion, by applying the principles of calorimetry and using the given data, we have calculated the energy of combustion for one mole of butane to be approximately 2888.81 kJ/mol.

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Answer: Salt is an ionic compound.

Explanation:

A compound formed by transfer of electrons from one atom to another is called an ionic compound.

For example, chemical formula of salt is NaCl (also called table salt).

Salt is formed when sodium (atomic no. 11) donates its one valence electron to chlorine (atomic no. 17). As a result, sodium ion and chlorine ion chemically combine together and form the compound NaCl.

Thus, we can conclude that salt is an ionic compound.

Answer:

Do you mean Tennessine?

Explanation:

It's in the 7th period, and has the shorthand of Rn. And it's 5 into the row.

Answer:

It appears that the diagram you provided represents the chemical compound chlorine monofluoride (CI-F). The arrow below the compound may be intended to indicate the movement or flow of electrons in the compound.

Chlorine monofluoride is a highly reactive and toxic compound that is used as a powerful oxidizing agent. It is a compound of chlorine and fluorine, with the chemical formula ClF. It is a yellowish gas at room temperature and has a strong, pungent smell. Chlorine monofluoride is highly reactive and can ignite or explode upon contact with many materials, including water. It is used in a variety of industrial processes, such as the production of semiconductors and the purification of aluminum. However, it can also be harmful to human health if inhaled or ingested, and it should be handled with caution.

Explanation:

Given:

mass of organic compound --- 0.246 g

mass of CO2 formed ----- 0.198 g

percentage of Carbon = 12 x mass of CO2 formed x 100

44 mass of organic compound

percentage of carbon = 12 /44 x 0.198/0.246 x 100

percentage of carbon = 2.376/10.824 x 100

% carbon = 0.2195 x 100

%carbon = 21.95

----------------------------------------------------------

Percentage of hydrogen =2/18× mass of H2O/mass of compound×100 = 2×0.1014×100/18×0.246 = 4.58

Hence,the composition of compounds are

CARBON : 21.95%

HYDROGEN : 4.58%.

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The concentration of NaCl (salt) when 4.9 moles are dissolved in 7 liters of water is 34.3M

Molarity is a unit of concentration measuring the number of moles of a solute per litre of solution.

Chemists primarily need the concentration of solutions to be expressed in a way that accounts for the number of particles that react according to a particular chemical equation. Since percentage measurements are based on either mass or volume, they are generally not useful for chemical reactions. A concentration unit based on moles is preferable.

Given,

Moles of NaCl = 4.9 moles

Volume = 7 L

Concentration = moles × volume (L)

= 34.3 M

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