If a sample contains 84.0 % of the R enantiomer and 16.0 % of the S enantiomer, what is the enantiomeric excess of the mixture

Explanation: Crystallization or crystallization is the process by which a solid forms, where the atoms or molecules are highly organized into a structure known as a crystal.

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Answer: The set of quantum numbers for the electrons in Be atom are (2, 1, -1, 1/2), (1, 0, 0, 1/2), (1, 0, 0, -1/2) and (2, 0, 0, -1/2)

Explanation:

There are 4 quantum numbers:

Berylium (Be) is the 4th element of periodic table having electronic configuration of \(1s^22s^2\)

For first electron:

\(n=1\\l=0\text{ (for s-subshell)}\\m=0\\s=+\frac{1}{2}\)

For second electron:

\(n=1\\l=0\\m=0\\s=-\frac{1}{2}\)

For first electron:

\(n=2\\l=0\text{ (for s-subshell)}\\m=0\\s=+\frac{1}{2}\)

For second electron:

\(n=2\\l=0\text{ (for s-subshell)}\\m=0\\s=-\frac{1}{2}\)

Hence, the set of quantum numbers for the electrons in Be atom are (2, 1, -1, 1/2), (1, 0, 0, 1/2), (1, 0, 0, -1/2) and (2, 0, 0, -1/2)

Answer:

3Mg(s) +2P(s) -------> Mg3P2(s) + energy

Keq= [Mg3P2]/[Mg]^3 [P]^2

Explanation:

The equation for the formation of magnesium phosphide from its elements is;

3Mg(s) +2P(s) -------> Mg3P2(s) + energy

Hence we can see that three moles of magnesium atoms combines with two moles of phosphorus atoms to yield one mole of magnesium phosphide. The equation written above is the balanced chemical reaction equation for the formation of the magnesium phosphide.

The equilibrium expression for the reaction K(eq) will be given by;

Keq= [Mg3P2]/[Mg]^3 [P]^2

Answer: 0.5643 mol NaOH

Explanation:

First, I would start off with plugging in what you can for the molarity equation, which is:

M = mol/L

So, since you have 0.285M and 1.98 L you can plug that in where it fits. So it’d be:

0.285M = mol/1.98L

To isolate the mols on one side of the equation, you multiple both sides by 1.98 L. (Because it’s in the denominator. If you were trying to find L, you would divide by # of mols since it’s in the numerator).

After multiplying, your final answer should be 0.5643 mols of NaOH.

Answer:

Moving left to right across each row from top to bottom:

(skipping filled spaces)

15, 13, 10, 13, 28

\(\frac{65}{29}\)Cu, 36, 29

122, 82, 82, 82, 204

\(\frac{28}{13}\)\(Al^{+3}\), 15, 13

\(\frac{68}{33} As^{-3}\), 33, 68

How to do it: Each symbol represents an element. Each element has its mass # above its atomic # next to its abbreviated symbol. The # of neutrons is the mass # - the atomic #. The # of protons is the same as the atomic #. It gets tricky with the electrons, so pay attention. Neutrons have no charge, so forget about them for now. Protons are positively charged, and electrons are negatively charged. If you look at some of those symbols, the Al (aluminum) has a number above it, to its right. That is its charge. The charge is usually zero, and isn't included, unless the # of protons and # of electrons are different. If so, subtract the # of electrons from the # of protons (protons - electrons = charge), which will give you the charge. Be sure to include the +/- sign when writing the charge. The # of protons + the # of neutrons is the mass #.

Leave a comment on my answer if there is anything you need me to explain in more detail.

Answer:

about1200 bc it isnt ordinary to round the 1200 to the 12th power so your answer will be 12450

Explanation:

The new volume of the gas when the temperature is;

a) lowered to -20°C is 22.67L

b) Increased to 373 K is 33.42L

The relationship between the volume of a gas and its temperature is described by Charles law and represented by the following expression:

V₁/T₁ = V₂/T₂

Where;

a). 26.7/298 = V/253

V = 22.67L

b). 26.7/298 = V/373

V = 33.42L

Therefore, the new volume at the differing temperatures are as described above.

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Approximately 0.157 liters or 157 milliliters of the 4.50 M HCl solution can be made by mixing the given solutions.

To determine the volume of 4.50 M HCl that can be made by mixing the given solutions, we can use the concept of the concentration-volume relationship:

C1V1 = C2V2

Where:

C1 = concentration of the first solution

V1 = volume of the first solution

C2 = concentration of the second solution

V2 = volume of the second solution

Let's assign the variables as follows:

C1 = 5.65 M

V1 = unknown volume (we'll solve for this)

C2 = 3.55 M

V2 = 250.0 mL = 0.250 L (since the volume is given in milliliters)

Now we can plug in the values into the equation and solve for V1:

(5.65 M)(V1) = (3.55 M)(0.250 L)

Dividing both sides of the equation by 5.65 M:

V1 = (3.55 M)(0.250 L) / 5.65 M

V1 ≈ 0.157 L

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Answer:

hola comoe stas

Explanation:

gracias x los puntos

Answer:

C2H4(g) + 3O2(g) ----> 2CO2 + 2H2O(l)

Mg(s) + 2HCL(l) ----> MgCl2(aq) + H2(g)

aC2H6 + bCO2 + cH2O → dC2H5OH The balanced equation for the reaction is given as; 6C2H6 + 2CO2 + 3H2O → 7C2H5OH, Check! Oxygen  Product = 7 Carbon Reactant = 6 * 2  +  2  = 14 Product = 7 * 2 =14 Hydrogen d = 7.

The manner that chemical equations are written ensures that almost all of the molecules are visible.Each oxygen molecule contains two oxygen atoms, which is why the symbol for it is [2].Recall that only two oxygen atoms make up each diatomic oxygen molecule that we breathe.

Oxidation processes, addition reactions, substitution reactions, and combustion reactions are the four basic types of reactions in which carbon is primarily involved.When carbon burns with oxygen present, heat and light are produced.

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Answer: c potassium.

Explanation:

potassium is the most reactive metal among the given options.

D is absolutely wrong.

Answer:i try and try but nobody likes me

Explanation: that's the story of the day lucky person brainiest pls

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Answer:

Para resolver este ejercicio debemos crear una relación entre la cantidad que necesita el paciente y la cantidad que tienen la pastilla del almacén. Transformamos 0.024 g, tenemos:

0.024 g = 24 mg

Ahora planteamos la relación, tenemos:

R = 24 mg/8mg

R = 3

Por tanto, se le debe dar al paciente 3 pastillas de 8 miligramos.

Nota: Tener en cuenta la homogeneidad de unidades.

Answer:

Exothermic Reaction

Product  = Calcium hydroxide + hydrogen

Explanation:

Answer:

josephmelichar

Explanation:

In the first step, 2 protons combine. In doing so one of the protons will convert into a neutron by losing a positron (positive electron) and a neutrino; this is also known as beta decay. This changes one of the protons (positive charge) into a neutron (neutral charge) and allows the two particles to combine.

The compound that has a functional group containing two oxygen atoms is peroxide. In addition to peroxides, there are other compounds that contain functional groups with two oxygen atoms. These include carboxylic acids and esters.

Peroxide compounds, such as hydrogen peroxide (H₂O₂) or organic peroxides, have a functional group (-O-O-) where two oxygen atoms are bonded together. This group is responsible for the characteristic properties and reactivity of peroxides.

Carboxylic acids: Carboxylic acids have the functional group -COOH, which consists of a carbonyl group (C=O) and a hydroxyl group (-OH) bonded to the same carbon atom. While carboxylic acids have one oxygen atom from the carbonyl group, the hydroxyl group provides the second oxygen atom.

Esters: Esters have the functional group -COO-, which consists of a carbonyl group (C=O) and an oxygen atom (-O-) bonded to the same carbon atom. This arrangement gives esters two oxygen atoms within their functional group.

Hence, the compounds with functional groups containing two oxygen atoms include peroxides, carboxylic acids, and esters.

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Answer:

ex.1

1.The water in the test tube expands as it is heated. There is only one direction to expand in, the glass tube. This glass tube is narrow so that a small change in volume will result in a considerable change in height; your signal is amplified. This is the same phenomenon as in thermometers with a glass bulb on the lower end.

2. there will be a thermal expansion will happened.

Cylinder will expand to 6.08 Lit by assuming that all the energy released is converted to work used to push the piston.

Concept of work :If we  apply force on an object and if the object moves and changes it's position, then product of the force and the displacement of an object in the direction of applied force is called work.

Given,

Pressure= P= 738.52 mm Hg = 0.97 atm. (∵ 760 mm Hg = 1 atm)

Initial volume =V1= 1.7 L

Work done = W = 439.6 J

As we need our answer in litters ..

let's convert the work done into suitable units

∴work done = W = 4.26 L-atm (∵ 1 J = 101.3 L-atm)

As given all the energy is assumed to converted into work so we need not to worry About heat loss or entropy.

work done = pressure * difference in volume

W = PΔV

ΔV = 4.26÷ 0.97

∴ΔV = 4.38 LIt

There for, the volume expanded = 4.38 Lit

So, total volume = 4.38+ 1.7 = 6.08 Lit.

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Answer:

Explanation:

From the given information:

\(2NO_2_{(g)} \to 2N_{2(g)} + O_{2(g)}\)

The above reaction is a zero-order reaction.

The rate constant = 0.0067 M-s⁻¹

Suppose the volume of the flask = 4L

Initial Mol of dinitrogen monoxide = 300 mmol

The final mol of dinitrogen monoxide = 150 mmol

The molarity of dinitrogen monoxide = \(\dfrac{ \text{number of moles of dinitrogen monoxide }}{\text{volume of flask}}\)

\(= \dfrac{300 \ m}{ 4 L}\)

= 0.0075 mmol/L

= 0.0075 L

The final concentration  \(= \dfrac{150 \ m}{ 4 L}\)

= 0.0375 L

By applying zero order equation

\(kt = [A_o] -[At]\)

\((0.0067)(t) = 0.075 - 0.0375\)

\((0.0067)(t) = 0.0375\)

\(\mathbf{t = 5.59 \ seconds}\)

Answer: (A,B,D) [1, 2, 4]

Explanation:

Answer:

Explanation:

IUPAC nomenclature is based on naming a molecule's longest chain of carbons connected by single bonds, whether in a continuous chain or in a ring. All deviations, either multiple bonds or atoms other than carbon and hydrogen, are indicated by prefixes or suffixes according to a specific set of priorities

Answer:

I will go for a heterogeneous mixture

Explanation:

alloy is basically a mixture

Answer:

In the above reaction, sulfur dioxide and oxygen react together to form sulfur trioxide. This means that an increase in pressure would move the equilibrium to the right and result in more sulfur trioxide being formed. Pressure can only affect the position of equilibrium if there is a change in the total gas volume.

The element would you get is Mg. 6C12 +   6C12 1  11Na24 + +1e0.

The first step in making carbon is to fuse the nuclei of hydrogen the lightest element to make helium the second lightest element. The next step is to fuse the two helium 4 nuclei. Each contains two protons and two neutrons. Forms beryllium-8. This takes in another helium and produces carbon-12.

The main problem in the carbon cycle is proton addition but after a carbon-12 nucleus fuses with a proton to form nitrogen-13 one of the protons decays to carbon-13 emitting a positron and a neutrino. Two more proton captures produce nitrogen-14 and then oxygen-15. Stellar Fusion Reactors In massive stars hydrogen burns to form helium. This produces carbon which can be further processed into oxygen and heavier elements.

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Answer:

homogeneous is consisting a part of or people are similar to each other or are if same type.