How many grams of mgcl2 must be provided 1.89 mole of chloride ions

Answers

Answer 1

Answer:

Mass = 89.97 g

Explanation:

Given data:

Number of moles of chloride ions = 1.98 mol

Mass in grams of MgCl₂ present = ?

Solution:

we can see that 1 mole of MgCl₂ contain 2 moles of chloride ions. Thus 1.89 moles of chloride ions contain moles of MgCl₂ are,

                  Cl₂          :        MgCl₂

                   2            :          1

                  1.89        :        1/2×1.89 = 0.945

Thus, 1.89 moles of chloride ions are provided by 0.945 moles of MgCl₂.

Mass of MgCl₂:

Mass = number of moles × molar mass

Mass = 0.945 mol × 95.211 g/mol

Mass = 89.97 g


Related Questions

It takes 15.0 seconds to run 100.0 meters if you run .0500 how many meters will you run

Answers

Answer:

150 seconds

Explanation:

Which locations are likely to have subatomic particles that are constantly in motion:
A) 1 and 2
B) 2 and 3
C) 1 and 3
D) 2 and 4

Answers

The answer is "2 and 4"

Location 2 and 4 are likely to have subatomic particles that are constantly in motion,thus the correct option is D.

In physics, a subatomic particle is a particle smaller than an atom.According to the Standard Model of particle physics, a subatomic particle can be either a composite particle, which is composed of other particles (for example, a proton, neutron, or meson), or an elementary particle, which is not composed of other particles Particle physics and nuclear physics study these particles and how they interact.

Experiments show that light could behave like a stream of particles (called photons) as well as exhibiting wave-like properties. This led to the concept of wave–particle duality to reflect that quantum-scale particles behave like both particles and waves; they are sometimes called wavicles to reflect this.

Thus,  the correct option is D.

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(a) At what substrate concentration would an enzyme with a kcat of 30.0 s−1 and a Km of 0.0050 M operate at one-quarter of its maximum rate? (b) Determine the fraction of Vmax that would be obtained at the following substrate concentrations [S]: ½Km, 2Km, and 10Km. (c) An enzyme that catalyzes the reaction X ⇌ Y is isolated from two bacterial species. The enzymes have the same Vmax but different Km values for the substrate X. Enzyme A has a Km of 2.0 μM, and enzyme B has a Km of 0.5 μM. The plot below shows the kinetics of reactions carried out with the same concentration of each enzyme and with [X] = 1 μM. Which curve corresponds to which enzyme?

Answers

The missing graph is in the attachment.

Answer: (a) [S] = 0.0016M

              (b) Vmax = 3V; Vmax = [tex]\frac{3V}{2}[/tex]; Vmax = [tex]\frac{11V}{10}[/tex]

              (c) Enzyme A: black graph; Enzyme B = red graph

Explanation: Enzyme is a protein-based molecule that speed up the rate of a reaction. Enzyme Kinetics studies the reaction rates of it.

The relationship between substrate and rate of reaction is determined by the Michaelis-Menten Equation:

[tex]V=\frac{V_{max}[S]}{K_{M}+[S]}[/tex]

in which:

V is initial velocity of reaction

Vmax is maximum rate of reaction when enzyme's active sites are saturated;

[S] is substrate concentration;

Km is measure of affinity between enzyme and its substrate;

(a) To determine concentration:

[tex]0.25V_{max}=\frac{V_{max}[S]}{0.005+[S]}[/tex]

[tex]0.25V_{max}(0.005+[S])=V_{max}[S][/tex]

[tex]0.00125+0.25[S]=[S][/tex]

0.75[S] = 0.00125

[S] = 0.0016M

For a Km of 0.005M, substrate's concentration is 0.0016M.

(b) Still using Michaelis-Menten:

[tex]V=\frac{V_{max}[S]}{K_{M}+[S]}[/tex]

Rearraging for Vmax:

[tex]V_{max}=\frac{V(K_{M}+[S])}{[S]}[/tex]

(b-I) for [S] = 1/2Km

[tex]V_{max}=\frac{V(K_{M}+0.5K_{M})}{0.5K_{M}}[/tex]

[tex]V_{max}=\frac{V(1.5K_{M})}{0.5K_{M}}[/tex]

[tex]V_{max}=[/tex] 3V

(b-II) for [S] = 2Km

[tex]V_{max}=\frac{V(K_{M}+2K_{M})}{2K_{M}}[/tex]

[tex]V_{max}=\frac{V(3K_M)}{2K_M}[/tex]

[tex]V_{max}=\frac{3V}{2}[/tex]

(b-III) for [S] = 10Km

[tex]V_{max}=\frac{V(K_{M}+10K_M)}{10K_M}[/tex]

[tex]V_{max}=\frac{V(11K_{M})}{10K_{M}}[/tex]

[tex]V_{max}=\frac{11V}{10}[/tex]

(c) Being the affinity between enzyme and substrate, the lower Km is the less substrate is needed to reach half of maximum velocity.

Km of enzyme A is 2μM and of enzyme B is 0.5μM.

Enzyme B has lower Km than enzyme A, which means the first will need a lower concnetration of substrate to reach half of Vmax.

Analyzing each plot, notice that the red-coloured graph reaches half at a lower concentration, therefore, red-coloured plot is for enzyme B, while black-coloured plot is for enzyme A

The water around you is in three different phases of matter: Select three.
gas
air
solid
liquid

Answers

Solid ,liquid and gas is the right answer:)

Define matrer?

a)Electrical conductivity
b)Anything that takes Iness and space
c) Something that doesn't take up space.​

Answers

Answer:

if you are asking matter then

Explanation:

Matter is defined as anything that has mass and takes up space (it has volume).

what is the measure of the average kinetic energies of all the molecules in substance?​

Answers

Answer:

Kinetic theory of gases is a description of gas as a large number of non-stop random moving particles (atoms or molecules, generally without distinction in physics, are called molecules). Fast-moving molecules continuously collide with other molecules or the walls of the container. Molecular motion theory is to explain the macroscopic properties of gas, such as pressure, temperature, volume, etc., through the composition and motion of molecules. The theory of molecular motion believes that pressure does not come from static repulsion between molecules, as Newton’s conjecture, but from collisions between molecules that move thermally at different speeds.

The molecule is too small to be seen directly. The random movement of pollen particles or dust particles under the microscope-Brownian motion, is a direct result of molecular collisions. This can be used as evidence of the existence of the molecule.

Temperature is a measure of the average kinetic energy of the particles in a substance. Temperature of a volume of air represents the average kinetic energy of its molecules. Temperature is a measure of the average kinetic energy of a substance.

According to Kinetic Molecular Theory, the average kinetic energy of gas molecules is a function only of temperature. where T is the Kelvin temperature and k is Boltzmann's constant.

Calculate the density of the following material: 500 kg gold with a volume of 0.026 m³.

Answers

Answer:

The answer is 19230.8 kg/m³

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\[/tex]

From the question

mass = 500 kg

volume = 0.026 m³

We have

[tex]density = \frac{500}{0.026} \\ = 19230.769230...[/tex]

We have the final answer as

19230.8 kg/m³

Hope this helps you

Help me please answer this with solution....A piece of granite weighing 250g is heated in a boiling water to 100°C. When a granite is place in a calorimeter containing 400g water, the temperature of the water increases from 20°C to 28.5°C. What is the specific heat of the granite, assuming all the heat is transferred to the water?​

Answers


heat lost by granite + heat gained by H2O = 0

[mass granite x specific heat granit x (Tfinal-Tinitial)] + [mass H2O x specific heat H2O x (Tfinal-Tinitial)] = 0
Substitute and solve for specific heat granite, the only unknown.

The specific heat capacity of the granite is 0.796 J/gºC

We'll begin by calculating the heat absorbed by the water. This can be obtained as follow:

Mass of water (M) = 400 g

Initial temperature of water (T₁) = 20 °C

Final temperature (T₂) = 28.5 °C

Change in temperature (ΔT) = T₂ – T₁ = 28.5 – 20 = 8.5 °C

Specific heat capacity of water (C) = 4.184 J/gºC

Heat absorbed (Q) =?

Q = MCΔT

Q = 400 × 4.184 × 8.5

Q = 14225.6 J

Thus, the heat absorbed by the water is 14225.6 J

Finally, we shall determine the specific heat capacity of the granite

Heat absorbed = Heat released

Heat absorbed = 14225.6 J

Heat released = –14225.6 J

Mass of granite (M) = 250 g

Initial temperature of granite (T₁) = 100 °C

Final temperature (T₂) = 28.5 °C

Change in temperature (ΔT) = T₂ – T₁ = 28.5 – 100 = –71.5 °C

Specific heat capacity of granite (C) =?

Q = MCΔT

–14225.6 = 250 × C × –71.5

–14225.6 = –17875 × C

Divide both side by –17875

C = –14225.6 / –17875

C = 0.796 J/gºC

Therefore, the specific heat capacity of the granite is 0.796 J/gºC

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Why is the wavelength of 633 nm used to analyze the standard solutions and drink samples?
Group of answer choices

The lower the wavelength, the blue solutions will absorb more light.

Corresponding with orange light, is the wavelength that blue solutions absorb the most.

Corresponding with blue light, is the wavelength that blue solutions absorb the most.

The higher the wavelength, the blue solutions will absorb more light.

Answers

Answer:

Corresponding with orange light, is the wavelength that blue solutions absorb the most.

Explanation:

When light is passed through a solution of a particular color, light of other wavelength or color, is absorbed and disappears, whereas the wavelength of light corresponding to the color of that solution is transmitted. The color of light absorbed the most is that which is complementary (opposite it in the color wheel) to the light which is transmitted. In a color wheel, blue is complementary to orange color, red is complementary to green and yellow is complementary to violet.

Therefore, in a blue substance (as in the blue solutions), there would be a strong absorbance of the complementary color of light, orange. Since the wavelength of orange color of light is between 600 - 640 nm, with maximum absorbance of orange light occurring around 633 nm, the wavelength of 633 nm is used to analyze the standard solutions and drink samples.

An atom has 9 electrons and 9 protons at the start. If it loses 2 electrons, the net charge on the atom will be

Answers

If it loses 2 electrons, the net charge on the atom will be 2. You should first see if the question is already answered next time.

how much calcium chloride is required to make 1 Liter of a .10M solution?

Answers

Answer:

110.91 g of CaCl2

Explanation:

11.9 grams of CaCl₂ is required to make 1 Liter of 0.1M solution.

Calculating the amount of CaCl₂ required:

We first need to calculate the molecular weight of calcium chloride CaCl₂.

The atomic weight of Ca = 40.01

and the atomic weight of Cl₂ = 2×35.45 = 70.90

So, the molecular weight of CaCl₂ = 40.01 + 70.90 = 110.91

This means that 110.91 g of CaCl₂ mixed with enough water will produce 1Liter of 1M solution.

Now, to calculate the amount of CaCl₂ required to make 1 Liter of 0.1M solution we use:

grams of chemical = (molarity of solution in mole/liter) x (MW of chemical in g/mole) x (ml of solution) ÷ 1000 ml/liter

= 0.1 × 110.91 × 1000 ÷ 1000

= 11.09 grams

So, 11.09 grams of CaCl₂ will be used.

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What is the mass of a single atom, which is approximately equal to the total mass of the protons and neutrons in an atom called?

Answers

Answer:

Mass number or relative atomic mass number.

Enter the cycle number, n, in the x column and the number of radioactive atoms in the y column. When you finish, resize the window.

Answers

Answer Answer: I am not too sure about the X or Y, but they didn't seem necessary in my quiz. However, after that, you'll want to click "Exponential" Explanation: I just took the test, that's about it!

pls help me with this!!

Answers

Answer:

B. 65

Explanation:

arrange your numbers as:

63,64,66,69

add 64 and 66 together to get 130 then divide by 2

-or just think about what number is between 64 and 66

Select the true statement(s) abut Polymers: Group of answer choices Thermoplastics have low melting temperature because of the week van der Waals bonds between their Long Chain Molecules Thermoplastics have low strength because of the week van der Waals bonds between their Long Chain Molecules Polymers have low densities because of the week van der Waals bonds between their Long Chain Molecules Polymer chains once synthesized they will remain stable in the environment because of the strong covalent bonds in the Long Chain Molecules

Answers

Answer:

Thermoplastics have low melting temperature because of the week van der Waals bonds between their Long Chain Molecules

Polymer chains once synthesized they will remain stable in the environment because of the strong covalent bonds in the Long Chain Molecules

Explanation:

Thermoplastics are polymers that are easily melted and changed to another shape as many times as possible. They become molten when they are heated and solidify when cooled. Examples of thermoplastics include; polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyamides, polyesters, and polyurethanes.

Polymers are organic materials that consists of a long chain of atoms held together by strong covalent bonds. Polymers constitute an important environmental concern because most polymers are non biodegradable and remain in the environment almost indefinitely.

What is the Theoretical yeild of CaCO3 from 2 g of CaCl2 and 2.5 g of K2CO3

Answers

Answer:

Theoretical yield of CaCO₃ is 2.002 g.

Explanation:

Given data:

Mass of K₂CO₃ = 2.5 g

Mass of CaCl₂ = 2 g

Theoretical yield of CaCO₃ = ?

Solution:

Chemical equation:

K₂CO₃ +  CaCl₂      →     CaCO₃ + 2KCl

Number of moles of K₂CO₃:

Number of moles = mass/molar mass

Number of moles = 2.5 g/ 138.205 g/mol

Number of moles = 0.02 mol

Number of moles of CaCl₂:

Number of moles = mass/molar mass

Number of moles = 2 g/ 110.98 g/mol

Number of moles = 0.02 mol

Now we will compare the moles of CaCO₃ with K₂CO₃ and CaCl₂.

                CaCl₂             :              CaCO₃

                    1                  :                  1

                  0.02              :              0.02

                 K₂CO₃            :               CaCO₃

                     1                 :                   1

                   0.02             :               0.02

Theoretical yield of CaCO₃:

Mass = number of moles × molar mass

Mass = 0.02 mol × 100.1 g/mol

Mass =  2.002 g

Theoretical yield of CaCO₃ is 2.002 g.

What are the physical properties of chlorine?

Answers

Answer:

The Physical Properties of Chlorine are as follows:

Color: Greenish-yellow.

Phase: Gas.

Odor: Disagreeable, suffocating smell.

Density: About two and one-half times as dense as air.

Solubility: Is soluble in water. ...

Boiling Point: The boiling point of chlorine is –34.05°C.

Melting Point: The melting point is –101°C.

Explanation:

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What do you notice about the pattern of volcanoes?

Answers

Answer:

What patterns do volcanoes form?

Volcanoes occur at convergent plate boundaries were subducting oceanic crust is melted. This magma rises through the crust to form volcanoes and volcanic island arcs. Volcanoes occur at divergent plate boundaries where upwelling magma pushes between plates (rift zones) as the plates move apart.

Draw the Lewis structure for CF3PCF2 where all fluorines are bonded to a C atom

Answers

Answer:

See attached picture.

Explanation:

Hello.

As you can see on the attached picture, this Lewis structure requires all the elements to attain eight electrons after bonding, that is why the phosphorous is bonded with the two carbon atoms via a single bond with the carbon having the three fluorine atoms and a double bond with the carbon having the two carbon atoms.

Such arrangement is due to the fact that:

- P gets eight electrons by obtaining three from the two sided carbon atoms.

- The first carbon gets eight electrons from its initial four, three provided by each surrounding fluorine and one from the central phosphorous.

- Each fluorine gets eight valence electrons from their initial seven and one from the available carbon atoms.

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(02.03 MC)
An electron moved from a lower energy level to a higher energy level. What most
likely happened during the transition? (5 points)

1) A random amount of light was released.
2) A fixed amount of energy was absorbed.

-
3) A fixed amount of energy was released.
1
4) A random amount of light was absorbed.

Answers

An electron moved from a lower energy level to a higher energy level, and during the transition, a random amount of light was released. Option A

What exactly are these electrons?

An electron is a kind of subatomic particle that has a negative charge. It is possible for it to be free (meaning that it is not associated with the nucleus of any atom) or it may be tied to the nucleus of an atom.

Electrons are sub-atomic particles that may be found in each atom of any chemical element and can occupy different energy levels. These electrons are capable of transitioning between different energy levels.

Electrons may transition from a state with a lower energy level, also known as the ground state, to a state with a higher energy level, also known as an excited state. Alternatively, electrons can transition from a state with a higher energy level to a state with a lower energy level.

When an electron goes from a lower energy level to a higher energy level, the atom takes in more energy, but when the electron moves from a higher energy level to a lower energy level, the additional energy is expelled mostly in the form of light.

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The principal quantum number for the outermost electrons in a Cl atom in the ground state is ________.

Answers

Answer:

The principal quantum number for the outermost electrons in a Cl atom in the ground state is 3.

Explanation:

By using the Pauling distribution the chlorine atom has an electronic set of [tex]3s1^{2}[/tex]

With n=3 for an orbital S, l = 0 , ml = 0 and ms = ± 1/2

Therefore the final answer is 3

You have 100. grams of potassium fluoride (KF). How many moles do you have? (1 mole KF = 58.09 g KF) *

1.00 mole KF

1.50 mole KF

1.72 mole KF

3.57 mole KF

Answers

Answer:

I think its 1.72 (:

Explanation:

Using the new ordering system, can we change the Lead and Silver rule to simply:

"Lead and silver salts are generally insoluble?" Why or why not?

Answers

Answer:

No, we change the Lead and Silver

Explanation:

The freezing temperature of lead decreases around the curves of AO as pure silver is applied to the lead material. Thus, in the case of platinum, AO is the freezing temperature curve of lead. Strong lead is in balance with fluid melting along this gradient (silver in lead solution).

What are differences between Jupiter and Saturn’s moons

Answers

Answer: Well one difference is that Jupiter's moons are large and are closer to each other. Also Jupiter has more moons than Saturn.

Explanation:

Answer:

The difference are :

jupiter moon saturn moon

1.jupitor moon has 4 1.saturn moon

moon has 7 moon

A protein was previously determined to contain 16.2 wt% nitrogen. A 691 μL aliquot of a solution containing the protein was digested in boiling sulfuric acid. The solution was made basic and the liberated NH3 was collected in 10.00 mL of 0.0390 M HCl . A volume of 4.16 mL of 0.0155 M NaOH was required to react with the excess, unreacted HCl . Calculate the protein concentration of the solution in units of milligrams per milliliter.

Answers

Answer:

6.60mg N / mL

Explanation:

All nitrogen is converted in NH₃ that react with the HCl, thus:

NH₃ + HCl → NH₄⁺ + Cl⁻

In the problem, the excess of HCl reacts with NaOH, thus:

HCl + NaOH → NaCl + H₂O

The moles of NaOH = Moles of HCl in excess is:

4.16mL = 4.16x10⁻³L * (0.0155mol / L) = 6.448x10⁻⁵mol HCl in excess

Initial moles of HCl are:

10x10⁻³L * (0.0390mol / L) = 3.9x10⁻⁴moles HCl

That means the moles of HCl that reacts = Moles of NH3 = Moles of N are:

3.9x10⁻⁴ moles - 6.448x10⁻⁵moles = 3.2552x10⁻⁴ moles N.

To convert these moles to grams we need to use molar mass of N = 14.01g/mol:

3.2552x10⁻⁴ moles N * (14.01g/mol) = 4.56x10⁻³g * (1000mg / g) =

4.56mg of N

And volume in mL is:

691 μL * (1mL /  1000μL) = 0.691mL

Concentration in milligrams per mililiter is:

4.56mg N / 0.691mL =

6.60mg N / mL

Match the term with the definition. (4 points)

Column A
1.
Liquid

:
Liquid

2.
Plasma

:
Plasma

3.
Solid

:
Solid

4.
Gas

:
Gas

Column B
a.
has lots of space between the charged particles

b.
has lots of space between particles and is easily compressible

c.
flows easily but is difficult to compress

d.
does not flow easily and is difficult to compress

Answers

Answer:

1 - does not flow easily and is difficult to compress

2 -does not flow easily and is difficult to compress.

3 -has lots of space between the charged particles.

4-flows easily but is difficult to compress.

Explanation:

the valency of nitrogen is 3 why​

Answers

That is the volume of the nitrogen atom

Answer:

The nitrogen atom has 5 electrons in the outermost shell, so it can accept 3 electrons to fulfil the octet structure. Therefore the valency of nitrogen is 3.

Which of the following terms best reflects the process by which humans store memories ?

Answers

Answer:

there are no term

Explanation:

what are the term

Oxides of sulfur are important in atmospheric pollution, arising particularly from burning coal. Use the thermodynamic data at 25 C given in the appendix to answer the following questions. a. In air, the oxidation of SO2 can occur: 1 2O2(g) SO2(g) S SO3(g). Calculate rG 298

Answers

Answer:

-70.87 kJ

Explanation:

Let's consider the following balanced equation.

1/2 O₂(g) + SO₂(g) ⇄ SO₃(g)

We can calculate the standard Gibbs free energy of reaction (ΔG°r) from the standard Gibbs free energies of formation (ΔG°f) using the following expression.

ΔG°r = 1 mol × ΔG°f(SO₃(g)) - 1/2 mol × ΔG°f(O₂(g) - 1 mol × ΔG°f(SO₂(g))

ΔG°r = 1 mol × (-371.06 kJ/mol) - 1/2 mol × 0 kJ/mol - 1 mol × (-300.194 kJ/mol)

ΔG°r = -70.87 kJ

which of the substances created a chemical change

Answers

Answer:

It is one and two

Explanation:

When you burn something it lights up  

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