an aqueous solution of sodium sulfide has a concentration of 0.238 molal.the percent by mass of sodium sulfide in the solution is

The average N-H bond energy can be calculated using the following equation:

ΔHf(NH3) = 3(N-H bond energy) + ΔHf(N2) + 4(ΔHf(H2)) - ΔHf(N) - 3(ΔHf(H))

Substituting the given values:

-46.11 kJ/mol = 3(N-H bond energy) + 0 + 4(0) - 472.7 kJ/mol - 3(218 kJ/mol)

Simplifying the equation:

3(N-H bond energy) = -46.11 kJ/mol + 472.7 kJ/mol + 3(218 kJ/mol)

3(N-H bond energy) = 1080.59 kJ/mol

N-H bond energy = 1080.59 kJ/mol / 3

N-H bond energy = 360.196 kJ/mol

Therefore, the average N-H bond energy in NH3(g) is approximately 360.196 kJ/mol.

The closest answer choice is (c)  390.9kJ .

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The spontaneity of a reaction is determined by the Gibbs free energy change (∆G), which is a measure of the system's ability to do work.

The equation that links ∆G, ∆H, and ∆S is: ∆G = ∆H - T∆S, where T is the temperature in Kelvin and ∆H and ∆S are the enthalpy and entropy changes, respectively. The signs of ∆H and ∆S determine whether the reaction is exothermic or endothermic and whether it is entropy-driven or enthalpy-driven, respectively.

If ∆G is negative, the reaction is spontaneous, meaning it occurs without the input of energy.The given reaction has a ∆H of 23.25 kJ and a ∆S of 161.26 J/mol∙K.

First, we need to convert the units of ∆S from J/mol∙K to kJ/mol∙K by dividing by 1000.∆S = 161.26 J/mol∙K ÷ 1000 = 0.16126 kJ/mol∙K Substitute the values into the equation to determine the spontaneity of the reaction:

∆G = ∆H - T∆S∆G = (23.25 kJ) - (298 K) x (0.16126 kJ/mol∙K)∆G = 23.25 kJ - 48.02 kJ∆G = -24.77 kJ Since ∆G is negative, the reaction is spontaneous.

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Newtons laws of motion:  For the planetary motion puzzle, Newton correctly identified the variables force and momentum. I hypothesize that momenta and forces are the appropriate variables to characterize the motion of the planets, as stated in Newton's grant request.

Do you think Newton believed in hypothesis?

Newton vehemently resisted the hypothesis-based approach, insisting that theories regarding the origins and characteristics of appearances, such as the laws of motion, be deduced from the facts instead.

A fundamental formulation for a hypothesis is "If this happens, then this will happen." Specifying what will happen to the dependent variable if you change the independent variable is one technique to formulate your hypothesis.

There are six forms of hypothesis and they are:

Simple hypothesis.

Complex hypothesis.

Directional hypothesis.

Non-directional hypothesis.

Null hypothesis.

Associative and casual hypothesis.

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Answer:

The presence of a nucleus in all protist organisms means they are all eukaryotic. ... Whether an organism contains one or multiple cells, the nucleus – the first and ... Diatoms; Green Algae – can live in fresh or salt water and sometimes moist ... Microscopy studies can be as easy as using a pipette to drop pond water onto a ...Explanation:

The pillar of sustainability broken by recycling electronics in India is environmental sustainability. Implementing a law that restricts electronics recycling to the US would not necessarily be the most effective solution, as it overlooks the complex global dynamics of electronic waste management.

Recycling electronics in India often involves improper disposal methods, such as burning or dismantling without proper safety measures. This leads to environmental pollution, including the release of hazardous substances into the air, soil, and water, thus violating the principle of environmental sustainability.

However, simply mandating that electronics can only be recycled in the US may not be the most optimal solution. Electronic waste is a global issue, and restricting recycling to a single country disregards the fact that electronic products are manufactured and consumed worldwide. A more comprehensive approach to addressing electronic waste would involve international cooperation, strict regulations, and monitoring of recycling practices to ensure they meet environmental standards.

Efforts should focus on improving recycling practices globally, including promoting responsible electronic waste management, developing sustainable recycling infrastructure in multiple countries, and encouraging the adoption of safe and environmentally friendly recycling practices. This approach would foster global sustainability and address the challenges associated with electronic waste disposal more effectively than a geographically limited restriction.

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Answer:

number 3

Explanation:

Explanation:

it's the third graph

values are put directly without scaling

Answer:Phosphate

Explanation:It is called phosphate because of this higher state (otherwise it would be called phosphite and be PO3+3 ).

After solving the equation benzene is 2.698 kg is the correct answer.

Description of the answer

1 day = 24 hrs = 24×60 minute = 1440 minutes

concentration of benzene in groundwater = 5 mg/l

100 gallon = 378.541 L

100 gallon/minute = 378.541 L/minute

100 gallon (378.541 l) benzene contaminated groundwater is being pumped per minute, therefore the volume of groundwater being pumped in one day (i.e. 1440 minutes) = (378.541 × 1440) l = 545099.04L

Since 1 l groundwater is contaminated with 5 mg benzene, therefore 545099.04 l groundwater is contaminated with = (545099.04 × 5) mg = 2725495.2 mg = 2725.495 g = 2.725 kg

Thus, 545099.04 l groundwater is pumped per day, which contains a total of 2.725 kg benzene as contamination.

Since 99% benzene from groundwater has to be removed, therefore benzene waste (kg) needed to be treated per day = (2.275 × 99 / 100) kg = 2.698 kg.

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Charge distributions are very important in being able to determine the chemical reaction taking place which also allows for the determination of the structure of a product.

Charge distributions can provide important information about the electron density and bonding in a molecule or ion, which can help to predict its behavior and reactivity.

If the calculated charge distributions are consistent with the predicted resonance structures, this suggests that the resonance structures accurately represent the electronic structure of the molecule or ion.

In general, the relationship between charge distributions and predicted resonance structures can provide valuable insights into the electronic structure and behavior of a molecule or ion, and can help to guide experimental studies and further theoretical calculations.

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Answer:

I honestly dont know but its cool problably from water fill or from the waves going to much

Explanation:

Approximately 18.4832 mL of 0.250 M NaOH is required to neutralize 30.4 mL of 0.152 M HCl.

To determine the volume of 0.250 M NaOH required to neutralize 30.4 mL of 0.152 M HCl, we can use the concept of stoichiometry and the balanced chemical equation for the neutralization reaction between NaOH and HCl:

NaOH + HCl -> NaCl + H2O

From the balanced equation, we can see that the stoichiometric ratio between NaOH and HCl is 1:1. This means that for every mole of NaOH, we require an equal number of moles of HCl to neutralize.

First, let's calculate the number of moles of HCl present in the given volume:

Moles of HCl = concentration of HCl * volume of HCl

= 0.152 M * 30.4 mL

= 4.6208 mmol (millimoles)

Since the stoichiometric ratio is 1:1, the number of moles of NaOH required to neutralize the HCl is also 4.6208 mmol.

Now, let's calculate the volume of 0.250 M NaOH needed to contain 4.6208 mmol:

Volume of NaOH = (moles of NaOH) / (concentration of NaOH)

= 4.6208 mmol / 0.250 M

= 18.4832 mL

Therefore, approximately 18.4832 mL of 0.250 M NaOH is required to neutralize 30.4 mL of 0.152 M HCl.

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Answer:

keep it from being washed away by water

Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. Therefore, the correct option is option B.

Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.

Matter is anything that is made up of atoms. Anything around us that can be physically seen and touched are matter. Ice, water and water vapors are example of matter.

So as we saw that matter has some mass so mass can be measured in gram only. Mass can also be represented as number of molecules. We also saw that matter occupy some volume and that volume is measured only in liter. In the given phase diagram, region C represents gas phase.

Therefore, the correct option is option B.

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Answer: A. Liquid

Explanation:

Answer:

H2O < NH3 < CCl4 < BCl3

Explanation:

Bond angle of a molecule or an ion can be explained by two concepts which are either by their valence shell electron pair repulsion (VSEPR) model or hybridization.

The VSEPR model  determines the total number of electron pairs surrounding the central atom of the species. All the electron pairs will orient themselves in such a way as to minimize the electrostatic repulsions between them. These repulsions hence determine the geometry of the covalent bond angles around the central atom.

Hence; as the number of lone pairs increases from zero to 2 the bond angles diminish progressively.

Hybridization is the mixing and blending of two or more pure atomic orbitals to form two or moe hybrid atomic orbitals which are identical in shape and energy. During the process of formation of these hybrid orbitals, The bonds formed i.e the sigma bond and the pi bond determines the bond angle of such compound.

From the given compounds;

H20 have a bond angle of 104.5°

NH3 have a bond angle of 107°

BCl3 have a bond angle of 120°

CCl4 have a bond angle of 109.5°

thus in an increasing order of bond angle:

H2O < NH3 < CCl4 < BCl3

Answer:

consisting of microscopically dispersed insoluble particles is suspended throughout another substance. However, some definitions specify that the particles must be dispersed in a liquid, and others extend the definition to include substances like aerosols and gels.

Explanation:

Hi,

The number of protons is equal to the atomic number. The number of electrons in a neutral atom is equal to the number of protons. So, in this case, you have 72 protons and 72 electrons.

I hope this helps :)

If an element has the atomic number 72, then the number of protons is also equal to 72. As it is clearly mentioned in the question that it is a neutral atom, which means the number of protons is equal to the number of electrons which is also 72.

An atomic number may be defined as the number of a chemical element in the modern periodic table through which the elements are systematically arranged in order of increasing the number of protons in the nucleus.

According to the context of this question, the atomic number of every element is always equal to the number of protons it has. While in a neutral atom, the number of electrons is equal to the number of protons. For calculating the number of neutrons, you have to subtract the atomic number from the atomic mass.

Therefore, there are 72 protons of an element whose atomic number is 72. The number of electrons is also 72.

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If 0.01 mol of neon gas at a particular temperature and pressure occupies a volume of 0.225 L, then 0.05 mol of neon gas would occupy a volume of 1.125 L under the same conditions.

Given:

Number of moles of neon gas (n₁) = 0.01 mol

Volume of neon gas (V₁) = 0.225 L

We are required to find the volume of neon gas (V₂) when the number of moles (n₂) is 0.05 mol under the same conditions.

The relationship between the number of moles, volume, and pressure of a gas is given by the ideal gas law: 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.

Since the temperature and pressure are the same in this case, we can rearrange the ideal gas law equation to solve for the volume:

V = (n₁ * V₁) / n₂

Substituting the given values into the equation:

V₂ = (0.01 mol * 0.225 L) / 0.05 mol

V₂ = 0.00225 L / 0.05 mol

V₂ = 0.045 L/mol

Therefore, 0.05 mol of neon gas would occupy a volume of 1.125 L under the same conditions.

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Biomagnification is a dangerous concept because toxic chemicals concentrate as they pass up the food chain. group of answer choices

What is biomagnification?

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Answer:

A- Convection, B- Conduction, C- Radiation.

Answer:

Electrical energy to mechanical energy

Explanation:

In an electric motor, the energy transformation that is involve is a move from from electrical energy to mechanical energy.

For every system, according to the law of conservation of energy "energy is neither created nor destroyed but transformed from one form to another".

Answer:

1. Absolute time, also known as Newtonian time is a time that exists independent of the observer of the time, and therefore, can only be expressed through mathematics

Absolute dating is a dating method that makes use of the radioactive property of matter and is determined through dating of radioactive isotopes present

Absolute time (dating) is found through radioactive dating

2. Radioactive isotopes are atoms that have the property of unstable proton neutron combination or excess energy nucleus. They can be fined as unstable element

3. A stabilized isotope are the decay product atoms of the element which are non radioactive.

4. The half life is the time it takes the original isotope to decay into the decay product

5. To determine the age of a rock, the proportion of the original isotope to the amount of decay product in the rock is compared

6. The isotope used to date organic materials is carbon-14

7. The isotope used to date rocks with comparable age to the Earth is Uranium-238 that has a half life of 4.468 billion years

8. The half life of carbon-14 is only 5,700 years while the age of a dinosaur is between 245 and 66 million years ago, and therefore, carbon is absent in most fossils

9. Uranium-238 is only found in igneous or volcanic rocks and not in metamorphic rocks, therefore, fossils  of dinosaur as well as other fossils that are buried in sedimentary materials, including sand and clay, cannot be determined by Uranium-238

Explanation:

The average volume of the cylinder is 12.0 cm^3.

The volume is the space that is occupied by an object. We know that volume could be measured by the displacement method. In this method, the cylinder is immersed into water. Before the cylinder is immersed into water, the volume of the water is measured and recorded as shown. After the cylinder is immersed into water, the volume of the water is measured and recorded. The volume of the cylinder is the difference between the volume of the water after and before the immersion of the cylinder as shown.

We know that the average value always gives us an idea of that the accurate value is supposed to be hence we would take the average of all the three measurements in order to obtain the required result as shown in the image attached to this answer.

Volume from first measurement =  11.7 cm^3

Volume from second measurement = 12.1 cm^3

Volume from third measurement = 12.2 cm^3

Average volume = 11.7 cm^3 + 12.1 cm^3 + 12.2 cm^3

/3

= 12.0 cm^3

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True ,This is the only set of lines in the electromagnetic spectrum that is visible.

The electromagnetic spectrum is the range of frequencies (the spectrum) of electromagnetic radiation, as well as the wavelengths and photon energies associated with them.

The electromagnetic spectrum encompasses electromagnetic waves with frequencies ranging from less than one hertz to greater than 1025 hertz, corresponding to wavelengths ranging from thousands of kilometres to a fraction of the size of an atomic nucleus. This frequency range is separated into bands, and the electromagnetic waves within each band are given different names; starting at the low frequency (long wavelength) end of the spectrum.

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Answer:

it can be increased by the number of atoms on each side

Answer:

diphenylmethane is liquid at room temperature.

Explanation:

It is a solid below room temperature and its melting point is at 22 degree celsius to 24 Celsius degree celsius.

Diphenylmethane is a solid at room temperature. Diphenylmethane is a non-polar compound.

Diphenylmethane is a colorless, crystalline solid with a melting point of 53 °C. It is a member of the diphenylmethanes, which are a class of organic compounds that contain two benzene rings joined by a single carbon-carbon bond.

Diphenylmethane is a non-polar compound, which means that it does not have any permanent dipole moments. This makes it difficult for the molecules of diphenylmethane to interact with each other, which is why it is a solid at room temperature.

If diphenylmethane were a polar compound, the molecules would be able to interact with each other through dipole-dipole interactions. This would make the compound more likely to be a liquid at room temperature.

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The artificial sweetener's empirical formula and the molecular formula are C₁₄H₁₈N₂O₅. Therefore, option C is correct.

An empirical formula is a chemical formula for a compound that provides the proportions (ratios) of the elements present but not the exact number or arrangement of atoms.

The empirical formula of an artificial sweetener is given as C₁₄H₁₈N₂O₅ and the molecular mass as 294.34 g/mol.

The molecular formula is written as n×(Empirical formula) where n=(molecular mass)÷ (Empirical mass).

First, find the empirical mass,

\(\begin{aligned}\mathrm{Empirical\;mass\;of\;C_{14}H_{18}N_2O_5}& = 12\times14+1\times18+14\times2+16\times5\\&=\mathrm{294\;g/mol}\end{aligned}\)

Then, we get the n value as follows,

n= 294.34 g/mol÷ 294g/mol

n=1

Then, the molecular formula is, 1×C₁₄H₁₈N₂O₅.

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Answer:

C

Explanation:

edge 2023

Answer:

For rusting, it is difficult to write an equation due to the complexity of the reaction. Thus, we can express the reaction like the following. According to the law of conservation of mass, the increased mass of nail and rust is the amount of oxygen.

Explanation:

I hope this helps:)

The molar solubility of BaCrO4 in 1.6 x 10^-3 M Na2CrO4 is 5.25 x 10^-10 M.

The solubility of BaCrO4 can be calculated using the solubility product constant (Ksp) and the stoichiometry of the balanced chemical equation for the dissolution of BaCrO4 in water.

The balanced chemical equation for the dissolution of BaCrO4 in water is:

BaCrO4(s) ↔ Ba2+(aq) + CrO42-(aq)

The solubility product constant (Ksp) expression for this reaction is:

Ksp = [Ba2+][CrO42-]

(a) To calculate the molar solubility of BaCrO4 in pure water:

Ksp = [Ba2+][CrO42-] = (x)(x) = x^2

where x is the molar solubility of BaCrO4 in pure water.

Rearranging the equation and solving for x, we get:

x = sqrt(Ksp) = sqrt(2.1 x 10^-10) = 1.45 x 10^-5 M

Therefore, the molar solubility of BaCrO4 in pure water is 1.45 x 10^-5 M.

(b) To calculate the molar solubility of BaCrO4 in 1.6 x 10^-3 M Na2CrO4:

In this case, the dissolution of BaCrO4 is affected by the common ion effect due to the presence of CrO42- ions from Na2CrO4. The balanced chemical equation for the reaction is:

BaCrO4(s) + 2Na+(aq) ↔ Ba2+(aq) + CrO42-(aq) + 2Na+(aq)

The initial concentration of CrO42- ions is 1.6 x 10^-3 M, and the concentration of BaCrO4 is x. Therefore, the equilibrium concentration of CrO42- ions is (1.6 x 10^-3 + x) M, and the equilibrium concentrations of Ba2+ and CrO42- ions are both x M.

The Ksp expression for the reaction is:

Ksp = [Ba2+][CrO42-] = (x)(1.6 x 10^-3 + x)

Substituting the value of Ksp and solving for x using the quadratic formula, we get:

x = 5.25 x 10^-10 M

Therefore, the molar solubility of BaCrO4 in 1.6 x 10^-3 M Na2CrO4 is 5.25 x 10^-10 M.

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