2 moles of sodium phosphate reacts with 3 moles of
calcium chloride
2Na3PO4 + 3 CaCl2 -> 6 NaCl + Ca2 (PO4)2
using the chemical equation above, how many moles
of NaCl can be produced if one of these is a limiting
reactant?

The entropy change is equal to 63.4 J/K

Entropy is one of the thermodynamic properties. The change in entropy of a system depends on the change in temperature, change in volume, or change in pressure.

The formula used to find the change in the entropy is as follows:

ΔS = n Cv lnT₂//T₁ + nR ln V₂/V₁

where,

n = number of moles

Cv = heat capacity

T = temperature

R = gas constant

V = volume

Given:

Number of moles (n) = 3

Temperature (T₁) = 5° C = 278 K

Temperature (T₂) = 95° C = 368 K

Molar heat capacity Cv = 75.38\ J/mol • K

Now we will find the change in the entropy as follows:

ΔS =nCvlnT₂/T₁

ΔS = 3 × 75.38 × ln(368/278)

ΔS = 226.14 × ln13.24

ΔS = 63.4 J/K

Hence the entropy change is equal to 63.4 J/K.

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In the redox reaction 2BrO3-(aq) + 3N₂H₄(g) ⟶ 2Br-(aq) + 3N₂(g) + 6H₂O(l), the oxidation number of bromine changes from +5 to -1.

Oxidation number is a number assigned to an atom in a chemical compound that represents the number of electrons lost (oxidation) or gained (reduction) by an atom when it forms a chemical bond with another atom.

In BrO₃-, the oxidation number of bromine is +5. This is because bromine is bonded to three oxygen atoms, each of which has an oxidation number of -2. The sum of the oxidation numbers of all the atoms in a molecule must be zero, so the oxidation number of bromine must be +5 to balance the negative oxidation numbers of the oxygen atoms.

In Br-, the oxidation number of bromine is -1. This is because bromine is bonded to one hydrogen atom, which has an oxidation number of +1. The sum of the oxidation numbers of all the atoms in a molecule must be zero, so the oxidation number of bromine must be -1 to balance the positive oxidation number of the hydrogen atom.

The change in oxidation number of bromine from +5 to -1 indicates that bromine has been reduced. This is because bromine has gained electrons in the reaction.

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Answer: Processes that change rocks from one type to another.

Explanation: During the rock cycle, different rock types change from one to another. For example, sedimentary rock changes to metamorphic rock through heat and pressure.

Answer:

2.764 °C

Explanation:

ΔT = 2 x 1.86 C/m x 0.743m = 2.764C That means the freezing point of the solution is 2.764C less than the pure solvent (water)

Answer:

83.637562

Explanation:

Lithium Atom, Fluorine common ion, Magnesium Common ion, Oxide common ion are the ones that are larger in each of the choices as given.

Positively charged ions are known as cations. Negatively charged ions are further referred to as anions. A charged atom or molecule can be referred to as an ion.

A balanced atom will change into a positively charged cation if one or more of its electrons are lost. A balanced atom will change into a negatively charged anion if it gains one or more electrons.

In the formula for an ionic compound, the positive ion, known as a cation, is listed first, followed by the negative ion, known as an anion. The net charge or neutral electrical charge in a balanced formula is zero. A cation can be either positive or negative.

An anion contains more protons than electrons, while a cation has a net positive electrical charge. An anion has a greater number of electrons than protons and a net negative electrical charge.

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The Number of moles present is 0.5mol.

What is ideal gas law?

The general gas equation, also known as the ideal gas law, is the equation of state for a fictitious ideal gas. The equation for the ideal gas's relationship to pressure P, volume V, temperature T, and number of moles n is known as the ideal gas law.

Use P V = n R T 

R = 0.08206 L -atm /mol -K when the pressure is in atmosphere atm, the volume is in litres L, and the temperature is in Kelvin K.

One atm is equal to 760.0 mm Hg, so depending on how the pressure changes, there will either be a division or multiplication.

Divide the value in mmHg by 760.0 mmHg/atm to convert it to atm.

P= 912mmHg /760mmHg/atm=1.2atm

to convert °C to kelvin,

  K=°C +273= 20+273=293K

R=0.08206

Add these values to given equation,

n=PV/RT

 = 1.2×10÷0.08206×293

 = 12÷24.02

 =0.5mol

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Answer:

111

Explanation:

Answer:

I believe Rhenium has 111 neutrons in the atoms isotopes.

Explanation:

an efficient three-step synthesis of 1,2-epoxycyclopentane from bromocyclopentane by dragging the appropriate formulas into the bins. are (1) Bromination, (2) E2 elimination and (3) epoxidation.

By treating cyclopentanol with PBr3, the -OH group in cyclopentanol is replaced by the more facile leaving group Br in the first step. • In the second step, E2 is eliminated in the presence of a strong base, such as NaOEt/EtOH, to produce cyclopentene. In the third step, cyclopentene is treated with mCPBA to produce 1,2-epoxycyclopentane. An E2 mechanism, which makes reference to bimolecular elimination, is basically a one-step process. The carbon-hydrogen and carbon-halogen bonds mostly differentiate to create a new double bond here. Nevertheless, in the E2 mechanism, a platform is a percentage step with a significant impact on the mechanism.

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The solution outside the tubing might have reacted with the air, causing oxidation and turning black.

When Alyssa performed Part A of the experiment, she observed that the solution outside the tubing turned black. This could be due to a process known as oxidation.

Oxidation is a chemical reaction that occurs when a substance reacts with oxygen in the air. The reaction causes the substance to lose electrons, which can cause a change in color, among other things.

In this case, the solution outside the tubing may have reacted with oxygen in the air, causing it to turn black. This reaction could have been facilitated by heat, light, or other factors that can increase the rate of oxidation. Additionally, the composition of the solution and the presence of any catalysts could have also contributed to the reaction.

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Answer:

A. Ra, Ag, Ge, Br

Explanation:

Electronegativity by increasing order:

Radium (0.89) - Silver (1.93)- Germanium (2.01)- Bromine (2.96)

The coordination number around the central metal atom in ammonium diaquabis(oxalato)nickelate(II) is 6.

In the given compound, ammonium diaquabis(oxalato)nickelate(II), the nickel (Ni) ion is the central metal atom. The coordination number refers to the number of ligands (atoms or molecules) that are directly bonded to the central metal atom. In this case, there are two oxalate ligands (C₂O₄²⁻) and two water ligands (H₂O) bonded to the nickel ion, resulting in a coordination number of 6.

Each oxalate ligand contributes two oxygen atoms, and each water ligand contributes one oxygen atom, giving a total of six ligands surrounding the central nickel atom.

Therefore, in the compound ammonium diaquabis(oxalato)nickelate(II), the central metal atom has a coordination number of 6.

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Answer:

The emission lines of Fe with strong intensities occurs together with emission lines due to other atoms such as Mg, Ca, and Si. Thus, the identification of emission lines from Fe is complicated by presence of many other lines due to other major and minor elements in soil.

Answer:

D - He was the first person to use the term Cells.

Explanation:

Hooke invented the first compound light microscope (not first microscope) and he examined a cork and saw that it was made up of thousands of empty pockets which he later called 'Cells'.

Hope it Helps! :D

Answer:

\(\boxed {\boxed {\sf B. \ d \approx 0.85 \ g/mL}}\)

Explanation:

Density is found by dividing the mass by the volume.

\(d=\frac{m}{v}\)

The mass of the object is 11 grams and the volume is 13 milliliters.

\(m= 11 \ g \\v= 13 \ mL\)

Substitute the values into the formula.

\(d= \frac{11 \ g}{13 \ mL}\)

Divide.

\(d=0.846153846 \ g/mL\)

Round to the nearest hundredth. The 6 in the thousandth place tells us to round the 4 to a 5.

\(d \approx 0.85 \ g/mL\)

The density is about 0.85 grams per milliliter.

In the ous/ic system, the naming of chemical species is based on the level of oxidation state of the central element in the compound. The species with the higher oxidation state is named with the "ic" ending, while the species with the lower oxidation state is named with the "ous" ending. This system helps to differentiate between two species that contain the same elements but have different oxidation states.

In the ous/ic system, many species are named with the ic ending. Some examples include the Atlantic herring, the Arctic tern, and the Pacific salmon. The ic ending typically indicates that the species belongs to a certain family or group. For example, many fish species in the herring family are named with the ic ending. However, it's important to note that not all species in the ous/ic system are named with this ending, and some may have different suffixes such as ate or ide. Overall, the ous/ic system is a useful tool for categorizing and identifying different species in the animal kingdom.
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Answer:

The second choice.

Explanation:

The products often have completely different properties than the reactants.

The first and third are wrong because matter is always preserved in a chemical reaction.

The last is not true.

Based on the specific rotation value of -31.5 deg.mL/dmig for cholesterol, the correct statement is option B. Cholesterol is levorotatory.

Specific rotation is a measure of the angle by which plane-polarized light is rotated when it passes through a sample of a chiral compound.

In the case of cholesterol, the specific rotation value of -31.5 deg.mL/dmig indicates that it is levorotatory.

Levorotatory compounds rotate plane-polarized light in a counterclockwise direction, which is represented by a negative sign in the specific rotation value.

In conclusion, the specific rotation value of -31.5 deg.mL/dmig indicates that cholesterol is levorotatory. Option B is the correct answer.

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The given question is in an inappropriate manner. The correct question is:

Cholesterol has a specific rotation of -31.5 deg.mL/dmig. Based on this information, select all statements that are true about cholesterol.

A. None of the other statements are correct.

B. Cholesterol is levorotatory.

C. Cholesterol has an R-configuration.

D. Cholesterol is dextrorotatory.

E. Cholesterol has an S-configuration.

Answer: Hydropower plants can negatively affect the fish population in an ecosystem.

The qualitative term for a solution containing solute at a relatively low concentration is dilute.A solution is a homogeneous mixture of two or more substances.

It consists of a solute that is dissolved in a solvent. There are different types of solutions based on the amount of solute dissolved in a solvent. These types include a dilute solution, a concentrated solution, and a saturated solution. Let's look at the meaning of the dilute solution.

A solution that contains a low concentration of a solute is called a dilute solution. It has a lesser amount of solute dissolved in a solvent. The quantity of solute in a solution is expressed in terms of its concentration. Dilute solutions are often prepared by adding solvent to a concentrated solution. When a solute is added to a solvent, it dissolves to form a solution. As more and more solute is added, the solution's concentration increases.

Concentration is the measure of the amount of solute present in a solution. It can be expressed in qualitative or quantitative terms. Qualitative terms describe a solution as dilute or concentrated based on the amount of solute present in a solution. On the other hand, quantitative terms specify the exact amount of solute present in a solution. This is expressed in units such as parts per million (ppm), molarity (M), and mole fraction (x).

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The value of electric flux is 2.45N.m²/C.

A flat sheet of paper of area 0.130 m² is oriented so that the normal to the sheet is at an angle of 56 ∘ to a uniform electric field of magnitude 18 N/C.

The electric flux through the paper is given by;

ϕ=E.A.cosθϕ

= Electric fluxE

= Electric field intensityA

= Area of the surfaceθ

= Angle between electric field intensity and normal to the surface

Given,E = 18 N/C A = 0.130 m² θ = 56°

The electric flux through the paper is :

ϕ=E.A.cosθϕ

= (18 N/C)(0.130 m²)cos56°ϕ

= 2.45 N.m²/C

The electric flux through any closed surface is proportional to the charge enclosed by the surface. The electric flux through an open surface can be calculated by multiplying the electric field intensity with the area of the surface and the cosine of the angle between the electric field intensity and the normal to the surface.

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Complete question:

A flat sheet of paper of area 0.130 m2 is oriented so that the normal to the sheet is at an angle of 56 ∘ to a uniform electric field of magnitude 18 N/C .Find the amount of elctric flux passing through the sheet?

When diluting an acid, it is recommended to add the acid to water and not the other way around (adding water to acid). This is because the process of mixing an acid with water can release a significant amount of heat, and adding water to concentrated acid can lead to vigorous and potentially dangerous reactions.

Here are a few reasons why it is safer to add acid to water:

Heat Dissipation: The dilution of strong acids is an exothermic process, which means it releases heat. By adding the acid slowly to water while stirring, the heat generated can be dissipated more effectively. On the other hand, if water is added to concentrated acid, there is a risk of localized heating and potential splattering due to rapid boiling or splashing of the hot acid.

Spattering and Splashing: When water is added to concentrated acid, there is a higher likelihood of spattering and splashing of the acid, which can cause burns or injuries. Adding acid to water allows for better control and minimizes the chances of violent reactions or sudden release of energy.

Dilution Gradually: By adding acid to water, you can gradually increase the volume and concentration, ensuring better mixing and distribution of the acid in the water. This helps prevent localized high concentrations of acid that could lead to rapid reactions.

Acidic Fumes and Aerosols: Concentrated acids often release fumes and aerosols that can be hazardous to inhale. By adding acid to water, any released fumes or aerosols are more likely to be contained within the larger volume of the solution, reducing the risk of exposure.

It's important to follow proper safety protocols, wear appropriate protective equipment (such as gloves and goggles), work in a well-ventilated area, and consult specific guidelines or procedures provided by chemical manufacturers or regulatory agencies when handling and diluting acids.

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Answer:

40.0L is the volume the CO occupy

Explanation:

To solve this question we must assume the gas is at STP. To find the volume of a gas using the moles, temperature and pressure of the gas we have to use:

PV = nRT

V = nRT / P

Where V is volume in liters

n are moles of the gas -Molar mass CO: 28g/mol-

50.0g * (1mol / 28g) = 1.786 moles CO

R is gas constant = 0.082atmL/molK

T is absolute temperature = 273.15K at STP

P is pressure = 1atm at STP

Replacing:

V = 1.786moles*0.082atmL/molK*273.15K / 1atm

V = 40.0L is the volume the CO occupy

Answer:

no idea

Explanation:

Answer:

Compound

Explanation:

It has a definite composition throughout and can be made of more than one type of element.

The oxidation state of iodine in IO³⁻ (iodate ion) is D) +5. This is because the overall charge of  IO³⁻ is -1, and since each oxygen atom has a -2 oxidation state, the iodine must have a +5 oxidation state to balance out the charge.

Let us discuss this in detail.

1. In the IO³⁻ ion, there are three oxygen atoms and one iodine atom.

2. Oxygen generally has an oxidation state of -2.

3. To find the oxidation state of iodine, we need to balance the overall charge of the ion. The ion has a charge of -1.

4. Using the formula x + (-2 × 3) = -1, where x represents the oxidation state of iodine, we can solve for x.

5. x - 6 = -1, so x = +5.

Thus, the oxidation state of iodine in IO³⁻ is +5.

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Answer:

22 626 000 J. = 22 626 kJ. 4. If 9000 J of heat are absorbed by 800 g of water at 5.0 o. C, what maximum temperature will the water attain? Q = mc ∆T.

Explanation:

The final temperature can be calculated using the calorimetric equation. Here, the final temperature of water is 27.71 °C.

The calorimetric equation connecting the heat energy absorbed or released q by a system with the mass m, temperature difference ΔT and the specific heat capacity c as follows:

q = m c ΔT

The specific heat capacity of water = 4.15 J/ °C g.

given that heat energy absorbed q = 9000 J

mass = 800 g

initial temperature = 25 °C.

Then,

9000 J = 4.15 J/ °C g. × 800 g (25 °C + T)

then T = [ 9000 J/  4.15 J/ °C g. × 800 g ] + 25 °C = 27.71  °C.

Therefore, the final temperature of water is 27.71  °C.

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Answer:

The energy required is 158 J

Explanation:

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

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

In other words, when a system absorbs (or gives up) a certain amount of heat, it can happen that it experiences a change in its temperature, which implies sensible heat.

The equation that allows calculating heat exchanges is:

Q = c * m * ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case:

Replacing:

Q= 0.79 \(\frac{J}{g*C}\) *10 g* 20 C

Solving:

Q= 158 J

The energy required is 158 J

Answer: A-, NA+ And OH-

Explanation: Thank me later