What is the concentration of free Ni2+ in 3.7009e-4 M Ni(NO3)2 and 1.3605 M NaCN?
Ni2+ + 4 CN− → [Ni(CN)4]2−
Kf = 1.000e+31

Answer:

A

Explanation:

the same as an electron

1. Atomic masses:

Iron (Fe) - 55.845

Sulfur (S) - 32.06

Oxygen (O) - 15.999

2. FeSO3 has:

1 Fe atom = 55.845

1 S atom = 32.06

3 O atoms = 3 * 15.999 = 47.997

3. Add up the atomic masses:

55.845 + 32.06 + 47.997 = 135.902

4. Therefore, the molar mass of FeSO3 is 135.902 grams/mole.

In terms of atoms, the formula FeSO3 shows:

1 Fe atom

1 S atom

3 O atoms

So there are 5 atoms total in each molecule of ferric sulfite (FeSO3).

Let me know if you have any other questions!

The formula for iron pyrite, also known as fool's gold, is \(FeS2.\)

This means that it consists of one iron atom and two sulfur atoms. It is called fool's gold because it has a metallic luster and is often mistaken for real gold by amateur gold miners. Iron pyrite is an important mineral as it is a source of sulfur and also contains iron, which is a valuable metal used in many industries.

However, it is not considered a reliable source of iron as it often contains impurities and is difficult to extract. In addition, it can also cause environmental problems if not properly managed as it can release sulfuric acid when exposed to air and water.

To know more about pyrite visit:

brainly.com/question/13435246

#SPJ6

Answer:

S

Explanation:

The symbol for entropy is S, and a change in entropy is shown as “delta” S or ΔS. If the entropy of a system increases, ΔS is positive. If the entropy of a system decreases, ΔS is negative.

Answer:

Explanation:

This is not the exact definition of a formula unit, but I think I know what is meant. You want the number of mols that 33.8 grams represents.

1 mol of SrF2

1 unit of Sr =                     87.62

2 units of F = 19.00 * 2 = 38.00

1 mol of SrF2          =       125.62

mols SrF2 = given mass / molar mass

given mass = 33.8

Molar mass = 125.62

mols = 33.8/125.62  = 0.269

consider a phosphate buffer, consisting of h2po4- and hpo42- . initially at the same ph as its pka (6.86) when concentrated sodium hydroxide is added to this buffer, the: Option C  ratio of [hpo42-] to [h2po4] in the buffer increases

The buffer's HPO42-to-H2PO4-ratio increases. Because NaOH reacts with H2PO4- and academic papers proton for neutralisation. Buffer Solution is a liquid solvent-based solution made up of a weak acid base, or a weak base and its conjugate acid. They are resilient to pH changes caused by dispersion or the addendum of small quantities of acid/alkali to companions. Water acts as a buffer, albeit a poor one. This is because of the fact that H20 ionises to shape H30+ and OH-. A weak acid and the conjugate acid are required to form an acid solution buffer. For alkali, the opposite is true.

Learn more about buffer here:

https://brainly.com/question/24262133

#SPJ4

Answer:

chemical formula

Explanation:

Answer:

ik right

Explanation:

The benefits of synthetics are numerous; they have properties not found in nature, allowing us to make things stronger, lighter, more fuel-efficient, shiner, and longer lasting. At the same time, we contribute to global pollution, have an impact on animal and human health, and require energy to produce.

The majority of synthetic fibers are pliable. Most synthetic fiber fabrics do not wrinkle easily.

Fabrics made of synthetic fibers are typically more durable, less expensive, and more widely available than natural fiber fabrics. The majority of synthetic fibers can withstand heavy loads without breaking.

Thus, The benefits of synthetics are numerous; they have properties not found in nature, allowing us to make things stronger, lighter, more fuel-efficient, shiner, and longer lasting.

To learn more about synthetic material, follow the link;

https://brainly.com/question/24357817

#SPJ1

aniapsmxuansyxineydo

The IR spectrum of Acetylferrocene will differ from that of Ferrocene because of the carbonyl stretching and bending modes that appear in the Acetylferrocene.

The IR spectrum of Acetylferrocene will differ from that of Ferrocene due to the carbonyl stretching and bending modes that appear in the Acetylferrocene.

Ferrocene and Acetylferrocene have similar IR spectra since they both have the Fe-Cp stretching and bending modes. The acetyl group of Acetylferrocene is reflected by an intense band in the 1700-1750 cm-1 range, which is due to carbonyl stretching.

                                     In Acetylferrocene, the IR spectra are dominated by the presence of the acetyl group's vibration, resulting in a change in the frequency of stretching vibration from 200 to 220 cm−1. Another change in the IR spectra of Acetylferrocene is the presence of two bands due to C-O stretching at 1230-1260 cm-1 in addition to the appearance of a strong band due to C-H bending vibrations in the 1410-1450 cm-1 region.

                           Ferrocene does not have a carbonyl group, which is why it will not display the carbonyl stretching and bending vibrations in the IR spectra. This is the most significant difference between the two IR spectra. So, we can conclude that the IR spectrum of Acetylferrocene will differ from that of Ferrocene due to the presence of the carbonyl group.

Therefore,  The IR spectrum of Acetylferrocene will differ from that of Ferrocene because of the carbonyl stretching and bending modes that appear in the Acetylferrocene.

Learn more about Acetylferrocene

brainly.com/question/31787348

#SPJ11

The formula of De Broglie is the following:

Remember that the mass of an electron is 9.11 x 10 ^(-31) kg, so replacing in the formula, we're going to obtain:

The answer is that the wavelength of an electron traveling at 1.48 x 10^(5) m/s is 4.91 x 10^(-9) m.

Answer: The stage of metamorphosis this occurs is called the PUPA stage. The correct option is D.

Explanation:

Metamorphosis can be defined as the change in form, mode of life and behaviour that occurs during embryonic development of an organism. In the metamorphosis of insects, which mostly reproduce sexually, insects can be grouped according to the way the eggs develop into adults. Some show:

--> Complete metamorphosis or

--> Incomplete metamorphosis.

In the life cycle of a butterfly, a COMPLETE metamorphosis occurs. This is because after fertilization, the EGG hatches into LARVA which passes through a PUPAL stage before becoming transformed into an ADULT insect. That is:

Egg --> Larva --> Pupa --> Imago.

When the caterpillar, which is the Larva stage, has reached its full size, it spins a pad of silk on a twig. It moves upward and attached it's clasper to this pad. It spin another silk thread at the thorax. These aids it to assume a slanting position with the head end pointing upwards. The pupa stage called the CHRYSALIS is reached when it tucks it's head under its thorax, arches it's body, shortens and broadens, and moults for the last time. Therefore the correct option is D (pupa).

Answer:

The answer is D. Pupa

The concentration of the unknown sulfuric acid sample is 0.0909M.

The first step in solving this problem is to calculate the molarity of the sodium hydroxide solution used in the titrations. This can be done using the balanced chemical equation for the reaction between oxalic acid dihydrate and sodium hydroxide:

\(H_{2} C_{2} O_{4}.2H_{2} O + 2NaOH\) → \(Na_{2} C_{2} O_{4}. 2H_{2}O\)  + \(2H_{2} O\)

From the equation, we can see that 2 moles of NaOH react with 1 mole of   \(H_{2} C_{2} O_{4}.2H_{2}O\) . Therefore, the number of moles of NaOH used in the titration can be calculated as follows:

moles NaOH = (volume of NaOH solution) x (molarity of NaOH solution)

moles NaOH = 25.30 mL x (1 L / 1000 mL) x (1 mol \(H_{2} C_{2} O_{4}.2H_{2}O\) / 126.07 g) x (2 mol NaOH / 1 mol \(H_{2} C_{2} O_{4} .2H_{2}O\)) x (1 L / 20.00 mol NaOH)

moles NaOH  = 0.002012 mol

Using the volume and moles of NaOH used in the first titration, we can calculate the molarity of the NaOH solution:

Molarity of NaOH = moles NaOH / volume of NaOH solution

Molarity of NaOH = 0.002012 mol / (25.30 mL x (1 L / 1000 mL))

Molarity of NaOH = 0.0796 M

Now we can use the volume and molarity of NaOH from the second titration to calculate the number of moles of sulfuric acid in the unknown sample:

moles \(H_{2} SO_{4}\) = (volume of NaOH solution) x (molarity of NaOH solution)

moles \(H_{2} SO_{4}\) = 22.85 mL x (1 L / 1000 mL) x (0.0796 mol NaOH / 1 L)

moles \(H_{2} SO_{4}\) = 0.001818 mol

Finally, we can calculate the concentration of the sulfuric acid:

Molarity of \(H_{2} SO_{4}\) = moles H2SO4 / volume of sulfuric acid

Molarity of \(H_{2} SO_{4}\) = 0.001818 mol / (20.00 mL x (1 L / 1000 mL))

Molarity of \(H_{2} SO_{4}\) = 0.0909 M

Therefore, the concentration of the unknown sulfuric acid sample is 0.0909 M.

To know more about titration refer here:

https://brainly.com/question/31870069?#

#SPJ11

The molecular formula of the compound that contains only carbon and hydrogen, with 85.6% carbon and has a molar mass of 70 g/mol is C₅H₁₀

C = 85.6%

H = 100 – 85.6 = 14.4%

Divide by their molar mass

C = 85.6 / 12 = 7.13

H = 14.4 / 1 = 14.4

Divide by the smallest

C = 7.13 / 7.13 = 1

H = 14.4 / 7.13 = 2

Thus, the empirical formula of the compound is CH₂

Empirical formula => CH₂

Molar mass of compound = 70 g/mol

Molecular formula = Empirical × n = molar mass

[CH₂]n = 70

[12 + (1×2)]n = 70

[12 + 2]n = 70

14n = 70

Divide both side by 14

n = 70 / 14

Molecular formula = [CH₂]ₙ

Molecular formula = [CH₂]₅

Therefore, the molecular formula of the compound is C₅H₁₀

Learn more: https://brainly.com/question/15009670

The mass of 0.5 moles of the element : 60.241 g

Given

mass of 2 x 10²¹ number of atoms of an element is 0.4 g

Required

the mass of 0.5 mole

Solution

Find relative atomic mass of the element(Ar)

mol of 2 x 10²¹ atoms :

\(\tt n=\dfrac{N}{No}=\dfrac{2.10^{21}}{6.02.10^{23}}=3.32.10^{-3}\)

\(\tt Ar=\dfrac{mass}{mol}=\dfrac{0.4}{3.32.10^{-3}}=120.482\)

the mass of 0.5 moles :

\(\tt mass=mol\times Ar\\\\mass=0.5\times 120.482=60.241~g\)

The mass number of the daughter nuclide will remain the same as Thorium-234 (mass number 234). The correct answer is D. 234, 91.

When there are too many protons or neutrons in a nucleus, one of the protons or neutrons will turn into the other, which is known as beta decay. During beta minus decay, a neutron transforms into a proton, electron, and antineutrino.

A daughter nuclide is created when a neutron in the nucleus decays into a proton during beta decay. While the mass number stays constant, the atomic number rises by 1.

We know the daughter nuclide will have an atomic number one unit higher than thorium (atomic number 90) because thorium-234 (Th-234) undergoes beta decay. The daughter nuclide will continue to have the same mass number as thorium-234 (mass number 234).

To know more about beta decay:

https://brainly.com/question/4184205

#SPJ4

2.02 g of ammonia are required to dissolve 1 g of methanol.

The parameters are as follows: • mass of methanol, 475 g

A compound's chemical composition is symbolically represented by its chemical formula. Chemical formulas reveal the elements that make up a compound's molecules as well as the ratio in which their atoms combine to create those molecules.

• The solution's concentration is equal to 0.25 m

The following formula is used to determine each compound's molar mass:

CH2OH (12) + (3 x 1) + (16) + (1) = 32 g/mol = NH3 = (14) + (3 x 1) = 17 g/mol

The following formula is used to determine the ammonia's molecular weight:

methanol mole equals 0.25 moles of NH3, which is equal to 0.25 x 0.475 moles of NH3, or 0.11875 moles.

The ammonia's mass is determined using the formulas below;

mass of ammonia = 2.02 g mass of ammonia = 0.11875 x 17 g

Therefore, 2.02 g of ammonia are required to dissolve 1 g of methanol.

To learn more about mass of ammonia from given link

https://brainly.com/question/14468879

#SPJ4

The work by Mark : 100 J

Work is the transfer of energy caused by the force acting on a moving object  

Work is the product of force with the displacement of objects.  

Can be formulated  

\(\tt W=F\times d\)

W = Work, J, Nm  

F = Force, N  

d = distance, m  

Mark is using 5N to push the box 20 m,

F = 5 N

d = 20 m

\(\tt W=5\times 20\\\\W=100~J\)

Catecholamines undergo conjugation with sulfate or glucuronide in phase II reactions.

In these reactions, the catechol group (-OH and -OH in adjacent carbon atoms) is usually targeted for conjugation. Catecholamines include neurotransmitters such as dopamine, norepinephrine, and epinephrine, which play essential roles in the sympathetic nervous system and stress responses. By conjugating with sulfate or glucuronide, the body can inactivate catecholamines and excrete them in urine, bile, or feces. This is an important step in maintaining the proper balance of these neurotransmitters in the body.

To know more about Catecholamines, here

brainly.com/question/30417027

#SPJ4

Answer:

5.0 cm/s

Explanation:

Q = V * A

given that the diameter of the particle = 0.1 cm

V = stream velocity , A = cross sectional area of stream , Q = stream flow

For a particle with a diameter of 0.1 cm,

To determine the stream velocity we will use a stadia rod to measure at least 5 meters down ( depth of stream ) three times and then take the average value which will be used to determine the cross sectional area of the stream but   Given that the width of the stream is not given the closet value to the stream velocity will be = 5.0 cm/s

There are total three laws of newtons, first law of newtons, second law of newton and third law of newton. Therefore, for every action there is an equal and opposite reaction.

Newton's first law is also called law of inertia. An object at rest remains at rest, and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force.

Third law of newton states  that for every action there is an equal and opposite reaction.

Therefore, for every action there is an equal and opposite reaction.

To know more about  newton's law, here:

https://brainly.com/question/29768600

#SPJ1

The additional information that is required to obtain the enthalpy of neutralization is the density of the solution.

We know that the enthalpy of neutralization is defined as the heat that is evolved when  an acid is neutralized by a base under standard conditions. We can be able to obtain the enthalpy of the neutralization of the acid and the base by performance of some simple chemical calculations.

To carry out this calculations we need the all of the pieces of information that have been listed in the question such as the masses of the solution, the temperature of the solution in the initial and final states and so on.

Learn more about enthalpy:https://brainly.com/question/7827769

#SPJ1

Answer:

Explanation: b

In an acid-base reaction, an acid donates a proton (H+) to a base. Without specific reactants mentioned, it is difficult to draw the products accurately. However, in general, when an acid reacts with a base, water and a salt are formed.

Water (H2O) is produced when the acid donates its proton to the base. The salt formed depends on the specific acid and base involved. For example, if hydrochloric acid (HCl) reacts with sodium hydroxide (NaOH), the products are water (H2O) and sodium chloride (NaCl).

In interactive 3D display mode, you can choose a base, such as NaOH, and an acid, such as HCl, and visualize the reaction by drawing water and the corresponding salt on the canvas. Remember to choose the appropriate bonding between atoms and label the products accordingly.

To know more about acid-base reaction visit:-

https://brainly.com/question/10224396

#SPJ11

480 mL of the HCl solution with a pH of 1.3 can be neutralized by one dose of milk of magnesia assuming the concentration of magnesium hydroxide is 0.2 M.

To determine the volume of \(HCl\) solution that can be neutralized by milk of magnesia, we need to know the concentration of the milk of magnesia.

Assuming milk of magnesia is a suspension of solid magnesium hydroxide in water, we need to know the concentration of magnesium hydroxide \((Mg(OH)2)\) in the suspension.

Let's assume that the concentration of magnesium hydroxide in milk of magnesia is 0.2 M.

The balanced chemical equation for the neutralization reaction between \(HCl\) and\(Mg(OH)2\)is:

\(2HCl + Mg(OH)2 - > MgCl2 + 2H2O\)

From the equation, we can see that two moles of \(HCl\) react with one mole of \(Mg(OH)2\).

To determine the volume of \(HCl\) solution, we need to calculate the number of moles of \(Mg(OH)2\) in one dose of milk of magnesia:

0.2 M = 0.2 moles / liter

Let's assume one dose of milk of magnesia is 30 mL, or 0.03 L. Then the number of moles of \(Mg(OH)2\) in one dose is:

0.2 moles / L x 0.03 L = 0.006 moles Mg(OH)2

Therefore, this amount of \(Mg(OH)2\) would require:

2 x 0.006 = 0.012 moles of \(HCl\) for complete neutralization

Now, let's calculate the volume of \(HCl\) solution needed to provide 0.012 moles of \(HCl\).

The volume of \(HCl\) solution can be calculated using the balanced chemical equation and the molarity of the \(HCl\) solution:

2 moles HCl / 1 mole \(Mg(OH)2\) x 0.012 moles \(Mg(OH)2\) / 1 = 0.024 moles HCl

\(pH = -log[H+]1.3 = -log[H+]\\[H+] = 5 x 10^-2 M\)

Now we can calculate the volume of the HCl solution using the equation:

moles = concentration x volume

0.024 moles = \(5 x 10^-2 M x volume\)

volume = 0.48 L or 480 mL

To know more about  milk of magnesia refer to-

https://brainly.com/question/22066653

#SPJ11