How much concentrated solution would you take to prepare 1.30 LL of 0.100 MM HNO3HNO3 by mixing with water

Answer:

[tex]0.361Ca\\\\ 0.639Cl[/tex]

Explanation:

Hello!

In this case, since the mass ratio here can be computed as:

[tex]\frac{mass\ Ca}{mass\ CaCl_2} \\\\\frac{mass\ Cl}{mass\ CaCl_2}[/tex]

For each element forming the compound we obtain:

[tex]\frac{36.1g}{63.9g+36.1g} = 0.361Ca\\\\\frac{63.9g}{63.9g+36.1g} = 0.639Cl[/tex]

Best regards!

Answer:

(C) Energy is released when the electron is ejected from the atom.

Explanation:

In the Bohr model of the atom, electrons are arranged in energy levels. The electrons in the lowest energy levels are nearest to the nucleus. An electron may move from a lower to a higher energy level by absorbing energy that is equal to the difference between the energies of the higher and lower energy level.

The potential energy of all electrons inside the atom have negative values and an electron which is infinitely far from the nucleus has an electrostatic potential energy of zero.

Energy is absorbed when an electron is removed from the atom (ionization). Hence the process is highly endothermic. Therefore it is false to say that "Energy is released when the electron is ejected from the atom."

Answer:

No and Yes

Explanation:

This is both possible and impossible. When you put your mind to what you believe, you can achieve it through patience and minded values. Your mind can either be your Greatest enemy or your Best Ally.

Answer: I think it’s 4

Explanation:

Answer:  B. trigonal planar

Explanation:

Valence Shell Electron Pair Repulsion Theory (VSEPR) is a model to predict the geometry of the atoms making up a molecule where atoms are arranged such that the forces of repulsion are minimum.

If a central atom is bound to three electron domains ,the number of electron pairs is 3, that means the hybridization will be [tex]sp^2[/tex] and the electronic geometry of the molecule will be trigonal planar as the electron pairs will repel each other and attain a position which is most stable.

Example: [tex]BCl_3[/tex] with 3 electron domains has trigonal planar geometry.

Answer: 0.00507 moles

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

[tex]Molarity=\frac{n\times 1000}{V_s}[/tex]

where,

n = moles of solute

[tex]V_s[/tex] = volume of solution in ml

1. moles of napthalene = [tex]\frac{3.09\times 0.001\times 100.0}{100}=0.000309moles[/tex]

2. moles of methyl napthalene = [tex]\frac{10.0\times 0.001\times 100.0}{1000}=0.001mole[/tex]

3. moles of dimethyl napthalene = [tex]\frac{23.2\times 0.001\times 100.0}{1000}=0.00232moles[/tex]

4. moles of trimethyl napthalene = [tex]\frac{14.4\times 0.001\times 100.0}{1000}=0.00144moles[/tex]

Thus total moles of all naphthalene compounds combined is (0.000309+0.001+0.00232+0.00144) = 0.00507.

Answer:

239.0 g/mol

Explanation:

Ca molar mass = 40.078

Cl molar mass = 35.45

O molar mass = 16

so that makes the total equation:  40.078+2(35.45)+8(16)

that equals 238.978 which rounds to 239.0 g/mol

Answer:

45.225 grams of H₂O will be formed when 36.8 g H₂ is mixed with 40.2 g O₂

Explanation:

The balanced reaction is:

2 H₂ + O₂ → 2 H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of each compound participate in the reaction:

Being the molar mass of the compounds:

then, by reaction stoichiometry, the following amounts of reactant and product mass participate:

The limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.

To determine the limiting reagent, it is possible to use the reaction stoichiometry of the reaction and a simple rule of three as follows: if by stoichiometry 4 g of H₂ react with 32 g of O₂, 36.8 g of H₂ with how much mass of O₂ will it react?

[tex]mass of O_{2} =\frac{36.8 grams of H_{2}*32 grams of O_{2} }{4 grams of H_{2}}[/tex]

mass of O₂=294.4 grams

But 294.4 grams of O₂ are not available, 40.2 grams are available. Since you have less mass than you need to react with 36.8 grams of H₂, oxygen O₂ will be the limiting reagent.

Then you can apply the following rule of three: if by stoichiometry 32 grams of O₂ form 36 grams of H₂O, 40.2 grams of O₂ how much mass of H₂O will it form?

[tex]mass of H_{2}O=\frac{40.2 grams of O_{2} *36 grams of H_{2}O }{32 grams of O_{2} }[/tex]

mass of H₂O= 45.225 grams

45.225 grams of H₂O will be formed when 36.8 g H₂ is mixed with 40.2 g O₂

Answer:

-4

16:00

8

it's pretty accurate besides it's way of numbering.

Answer:

The dihedral angle between the X substituents for the anti conformation is 180°

Explanation:

Note: I think this question is not complete. Still, it can be answered. But for your concept and understanding, I am completing this question and then I will try to solve this question for you.

Other part of this question is about Gauche conformations and angle between the x substituents.

So, I will be drawing and answering both.

Answer to the original question: 180°

So, the dihedral angle between the X substituents for the anti conformation is 180°

Answer to the Gauche Conformation: 60°

Here, in this question we are discussing about the possible different staggered conformations of CH2XCH2X

You can see the angles between the X substitutes in anti conformations and Gauche Conformations for yourself in the attachment below.

Furthermore, this CH2XCH2X has 3 possible different staggered conformations. Out of which, one is anti conformation and other two are Gauche conformations.

Please refer to the attachment to see the conformations. Check the angles between X-X. In anti conformation, angle between X-X is 180° and energy is lower, because of the less interaction between H and X. However, in Gauche conformation, angle between X-X is 60° and energy is higher, because of the more interactions between H and X than anti conformation.

Answer:

[tex]P_1=206.7lbmol/h\\\\P_2=413.3lbmol/h[/tex]

Explanation:

Hello!

In this case, for the separation of the benzene-toluene mixture, we can use the following mole balances including the given mole fraction at each stream per species:

[tex]B:0.36*620=0.98P_1+0.05P_2\\\\T:0.64*620=0.02P_1+0.95P_2[/tex]

That can be solved by using a solver for P1 (benzene-rich flow) and P2 (toluene-rich flow):

[tex]P_1=206.7lbmol/h\\\\P_2=413.3lbmol/h[/tex]

Best regards!

Answer:

-3.28 × 10⁴ J

Explanation:

Step 1: Given data

Step 2: Calculate the work (w) done by the gaseous mixture

We will use the following expression.

w = -P × ΔV = -P × (Vf - Vi)

w = -27.0 atm × (100.0 L - 88.0 L)

w = -324 atm.L

Step 3: Convert w to Joule (SI unit)

We will use the conversion factor 1 atm.L = 101.325 J.

-324 atm.L × 101.325 J/1 atm.L = -3.28 × 10⁴ J

Answer: Please see answers in explanation column

Explanation:

A. When the required amount of one solution has been added to the second solution to complete the reaction------- Equivalence point

B. Process of slowly adding a solution to react with another solution and determine the concentration of one of the solutions based on the reaction between them.---- Titration

C. A reagent added to the analyte solution that changes color when the reaction is complete.----- Indicator

D. Solution of known concentration that is slowly added to a solution of unknown concentration------Titrant

E. Solution of an unknown concentration that has another solution slowly added to it.------Analyte

F. Glassware that allows a solution to be precisely and slowly added to another solution--------- Burette

Titration is the process that is used in quantitative analytical Chemistry to determine the concentration of an analyte ( Unknown concentration). This is done by slowly passing the Titrant ( Known concentration) from the burette into a conical flask containing the analyte after which an indicator must have been added to the analyte solution such that when the equivalence point is reached, the analyte changes colour to show that the reaction has been completed.

Answer:

potential of hydroxide

Explanation:

Answer:

B

Explanation:

Answer:

B. CHNOPS

Explanation:

Carbon Dioxide

Hydrogen

Nitrogen

Oxygen

Phosphorus

Sulfur

The given question is incomplete. The complete question is:

A chemist adds 35.0 mL of a 2.82M sodium nitrate (NaNO3) solution to a reaction flask. Calculate the millimoles of sodium nitrate the chemist has added to the reaction flask.

Answer: 98.7 mmol

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

[tex]Molarity=\frac{n}{V_s}[/tex]

where,

n = milli moles of solute

[tex]V_s[/tex] = volume of solution in ml

Now put all the given values in the formula of molarity, we get

[tex]2.82=\frac{n}{35.0}[/tex]

[tex]n=2.82\times 35.0=98.7mmol[/tex]

Therefore, the millimoles of sodium nitrate the chemist has added to reaction flask are 98.7

Answer: variations

Explanation:

Answer:

c shapes and sizes

Explanation:

I just finished my test on it

Answer:

1) Traits

Explanation:

Strength, sickness, Stretchiness, and color are all different because they result in a different body part and there all traits of the body

Answer:

Mass = 157.56 g

Explanation:

Given data:

Mass of Xe in gram = ?

Volume = 26.17 L

Temperature = standard = 273.15 K

Pressure = standard = 1 atm

Solution:

we will calculate the number of moles first.

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

1 atm ×26.17 L = n×0.0821 atm.L/ mol.K  × 273.15 K

26.17 atm.L = n× 22.43 atm.L/ mol

n = 26.17 atm.L / 22.43 atm.L/ mol

n = 1.2 mol

Mass of Xe:

Mass = number of moles × molar mass

Mass = 1.2 mol × 131.3 g/mol

Mass = 157.56 g

Answer: 6.02214076 atoms Ca

Explanation:

Ca is monoatomic, so atoms in 1 mol = avogadro number

Answer:

It tells what kind of weather. depending on what color it will show the amount of precipitation. for example, a light green will mean it is raining lightly. a blue means that it is snowing  

Explanation:

Answer:

Because the molecules of the mixture would be compact or bond together at room temperature. In this case, both gases will condense to form water (or ice, if the room temperature is prolonged) and such droplets of water will not cause a balloon to spontaneously explode at room temperature.

Explanation:

A mixture of hydrogen and oxygen will form water. Recall that the chemical formula for water is H₂O, where H represents Hydrogen and O represents Oxygen.

A balloon is a light (not thick) solid substance with a thin membrane when blown or filled with some elements or gases.

Room Temperature means cool or cold temperature. You already know that generally at room temperature, the molecules of any substance will stick together or will become less mobile (less spontaneous).

In this case, hydrogen gas and oxygen gas will go through a process called condensation - to form water - and then through the process called freezing - to form ice.

At room temperature, the gases will first change state (state of matter) from gaseous to liquid and then from liquid to solid.

This is why the balloon will NOT spontaneously explode.

The total pressure  inside the balloon : 62.1 atm

Given

2 g of H2 gas (MM= 2g/mol)

16 g of Ne gas (MM= 4g/mol)

2 L balloon  at 30'C

Required

The total pressure

Solution

mol H2 :

= mass : MM

= 2 : 2

= 1

mol Ne :

= 16 : 4

= 4

Total mol of gas = 5

T = 30+273 = 303 K

Ideal gas law :

P = nRT/V

P = 5 moles x 0.082 L.atm/mol.K x 303 K / 2 L

P = 62.1 atm

Answer:

B.

Explanation:

Answer:

no but it might just be my computer acting up again

Explanation:

Answer:

[tex]\% rec=80.4\%[/tex]

Explanation:

Hello!

In this case, since the percent recovery for this crystallization operation is computed as shown below:

[tex]\% rec=\frac{m_{recovered}}{m_{initial}} *100\%[/tex]

Thus, by plugging in the initial 8.95 g and the recovered 7.20 g, we obtain:

[tex]\% rec=\frac{7.20g}{8.95g} *100\%\\\\\% rec=80.4\%[/tex]

Best regards!

Answer:

See explanation and image attached

Explanation:

A molecule is said to have a dipole moment whenever there is a separation of charge in the molecule. When this occurs, one end of the molecule is positive while the other end is negative. The molecule is now said to be polar.

If two atoms in a molecule have a significant difference in electronegativity between them, then the bond between the both atoms is polar and will possess a dipole moment.

The direction of the dipole moment vector is always towards the negative atom as shown in the image attached. Only HF and IBr are polar. Diatomic molecules such as Br2 and F2 are nonpolar.

The dipole moment refers to the separation of charges in the molecule. Atoms are in opposite directions. (a) HF. F is more electronegative. The vector is pointing F. (b) IBr. The vector points Br.

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

The dipole moment can be used to analyze the molecule's polarity.

Let us say that a molecule is composed of an element with a positive charge  (E1 ⁺) and another element with a negative charge (E2⁻). These two elements are separated by a distance d.

               E1 ⁺  --------- (d) ----------- E2⁻        

              (+Q)                                 (-Q)

Each element has a charge magnitude, Q. Depending on the charge, Q can be either positive (+Q) or negative (-Q).

When +Q = -Q, the dipole moment is represented with a μ letter, and it equals the product between the magnitude of the charge, Q, and the distance, d.

                                              μ = Q x d

Now, let us analyze the molecule estructure.

The covalent bond that joins two atoms is composed of two electrons.

If one of the atoms is more electronegative, it pulls the electrons to its side.      

This is represented with an arrow carrying a positive symbol,  +→ . The arrow is directed to the position of the electronegative atom.

The highest density of electrons surrounding one of the atoms is represented as δ⁻, while the lowest density of electrons is represented as δ⁺.        

In these situations, in which charges are different, and there is a separation of charge in the molecule, we can say that molecules are polarized.  

These molecules have a dipole moment, and when representing them, the direction of the dipole moment arrow is always pointing to the most negative atom.

In the attached files you will find the molecules    

 ---------------------------------

You can learn more about dipole moment at

https://brainly.com/question/16260427

Answer: Heat energy is absorbed to vaporize a liquid because molecules which are held together by intermolecular forces in the liquid are separated as the gas is formed

Explanation:whatever that means^ I looked it up