How many grams of FeSO_4 (Mw = 152.0 g/mol) are present in a 20.0 ml sample of a 0.500 M solution? A) 65.8 g B) 6.08 g C) 3.04 g D) 1.52 g E) 0.760 g

Answer:

A blue-eyed man and a brown-eyed woman have two children, both of whom have brown eyes.

Explanation:

Answer:

2. 2F2O3 = 4Fe + 3O2

3. 2Na + Cl2 = 2NaCl

4. 2HgO = 2Hg + O2

5. TiCl4 + O2 = TiO2 + 2Cl2

6. 4Al + 3O2 = 2Al2O3

7. 2HCl + Zn = H2 + ZnCl2

8. 2Al + 3CuCl2 = 2AlCl3 + 3Cu.

Octane is an alkane with the chemical formula C8H18 and the condensed structural structure CH3(CH2)6CH3.

An element is a fundamental thing that is challenging to break down into smaller components. In chemistry and physics, an element is a substance that cannot be broken by non-nuclear processes. In mathematics and computers, an element is a special part of a larger system or set. In chemistry, a simple material is referred to as one that cannot be broken down into smaller components or changed into another chemical. An element is made up of atoms, which are composed of protons, neutrons, and electrons. Each of an element's atoms contains a set number of protons.

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Based on the figure above, the boiling point of ethyl alcohol under the external pressure of 0.658 atm is option A 40 C

We know for Ethyl alcohol the boiling point at 1atm pressure is 78.37°C= 351.37K. Final pressure is 0.658atm. we know P1\P2=T1\T2 ==> T2= 0.658×351.37=231.20K= 40°C (option A). So option A is correct. The boiling point of a substance is the temperature at which it changes from a liquid to a gas (vapor) at a given pressure. At the boiling point, the vapor pressure of a liquid is equal to the pressure of the surrounding atmosphere. For a given pressure, different substances have different boiling points. The boiling point of a substance can also be affected by changes in pressure; for example, at higher altitudes, the atmospheric pressure is lower, so the boiling point of a liquid will be lower.Boiling points are a physical property of a substance and are commonly used to identify and separate different compounds in a mixture. For example, in the process of distillation, different compounds in a mixture are separated based on their different boiling points.

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the complete question is :

Based on the figure above, the boiling point of ethyl alcohol under the external pressure of 0.658 atm is ___ C?

A. 40

B.80

C.60

D.70

E.20

Based on the hydrogen atom's spectrum, he postulated that the lines were caused by light being emitted or absorbed as an electron changed orbits within the atom (option b).

The majority of stars and the sun contain hydrogen, and Jupiter is primarily made of this element. Water is the form of hydrogen that is present on Earth in the highest amounts. Only very small amounts of it—less than 1 part per million by volume—are present in the atmosphere as a gas.

To produce energy, power, and heat, hydrogen can be used in fuel cells. Nowadays, transportation and fertilizer manufacturing are the two uses of hydrogen that are most prevalent.

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In order to react with 3.15 g of N2, we would need 6.3 grams of H2. This is because the balanced chemical equation for the reaction of nitrogen (N2) and hydrogen (H2) to form ammonia (NH3) is:

N2 + 3H2 → 2NH3

So for every 1 mole of N2, we need 3 moles of H2. Since the molar mass of N2 is 28.02 g/mol and that of H2 is 2.02 g/mol, we can use the following conversion to find the number of grams of H2 needed:

3.15 g N2 x (3 moles H2/1 mole N2) x (2.02 g H2/1 mole H2) = 6.3 g H2

The scripting language known as Microsoft VBScript (Visual Basic Script) was created by Microsoft and is based on Visual Basic. It is a general-purpose, lightweight, and active scripting language.

When it comes to scripting languages, JavaScript is utilised on the client side, whereas VBScript can be used on the server and client. In contrast to VBScript, which employs various operators for various operations, JavaScript employs a single operator for all operations.

VBScript is a scripting language, and that should be understood right away. PowerShell is primarily designed to be a shell, though it can also be used for scripting. Thus, learning VBScript may come naturally to you if you have experience with a scripting language like Visual Basic.

Microsoft The Microsoft scripting language known as VBScript (Visual Basic Script) is based on Visual Basic and is a general-purpose, lightweight, active language. A test automation tool called Quick Test Professional (QTP) now uses VBScript as its primary scripting language.

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Answer:

C₂H6 + O2 → 2CO2 + 3H2O

Strong acids almost entirely transfer their protons to the solvent molecules, including HCl, HClO4, and HI.

a way to measure how basic or acidic a substance or solution is. The pH scale has numbers 0 through 14. On this scale, a pH value of 7 is regarded as neutral, indicating it is neither acidic nor basic.

The hydronium ion concentration in moles per liter must be known in order to estimate the pH of an aqueous solution (molarity). Using the formula pH = - log [H3O+], the pH is then determined. Take a 0.0025 M HCl solution as an example, and calculate its pH. Since it is potent and completely ionized in water, HCl qualifies as an acid.

(a)    0.16 M HCl

       pH = -log[H+] = -log[0.16] = 0.79

       pH = 0.79

(b)    4.4 M HClO4

        pH = -log[H+] = -log[4.4] = -0.64

        pH = -0.64 (negative sign)

(c)    2.3???10?11 M HI

Here we have typo error 2.3???10?11 M HI instaed of 2.3 x 10-11 M

[H3O+]total = [HA]acid + [H3O+]water

[H3O+]total = [HA]acid + [OH-]water (since, [H3O+]water = [OH-]water)

[H3O+]total = [HA]acid + [OH-]water = (2.3e-11) + (9.99e-8) = 9.9923e-8

pH = -log[[H3O+]total] = -log[9.9923e-8] = 7.00

pH = 7.00

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Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 2.78g  is the mass of HCl.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

Mathematically,

Molarity= number of moles of solute/volume of solution in litre

Where,

moles= given weight /by molecular weight

         = w/ 36.46

Substituting values in equation 1

0.612=(w/36.46)/( 125/1000)

w=0.80g

Therefore, 2.78g is the mass of HCl.

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Answer:

A. Zinc react with oxygen to form zinc oxide

Answer: 5356.091400000158

Explanation:

Answer:

see below

Explanation:

wavelength of UV light= 2.94 * 10-⁸m .

we need to find out its frequency,

As we know that,

[tex]v = f \lambda [/tex]

hence,

3 * 10⁸ m/s = f * 2.94 * 10-⁸m

f = 3/2.94 *10⁸*10⁸

f = 1.02 * 10¹⁶s-¹

and we are done!

Answer:

i agwee!

Explanation:

Yash they are right

The ratio of the molar concentrations of H2PO₄⁻ to H3PO₄ is 0.09

The ratio of the molar concentrations of at a pH of 7.40, CO₃²⁻ to HCO₃⁻ is 1:1.

The number of moles of a solute per liter of solution is referred to as molar concentration or molarity.

When the reaction's balanced equation is

H₂CO₃(aq) → HCO₃ -(aq) + (H⁺)

Ka = 4.3 x10⁻⁷ and  PH = 7.4

To get PKa = -㏒ Ka

PKa = -㏒(4.3x10⁻⁷) = 6.37 by changing the Pka value in the formula below:

PH = Pka + ㏒[salt/acid]

PH= PKa + ㏒[HCO3-]/[H2CO3]

㏒[HCO⁻₃]/[H₂CO₃] = PH-Pka

[HCO₃⁻] /[H₂CO₃] = 10^(7.4 - 6.37)

∴[HCO₃⁻]/[H₂CO₃] = 11.7

∴[H₂CO₃]/[HCO₃⁻] = 1/11.7 =  0.09

This is due to the fact that the two ions are in equilibrium at a pH of 7.40, which means that for every HCO₃ molecule produced, there is also one molecule of CO₃²⁻ produced. This is as a result of the following response:

CO₂(carbon dioxide) + H₂O ⇌ H₂CO₃ ⇌ HCO₃⁻ + H⁺ ⇌ CO₃²⁻ + 2H⁺

The reaction is in equilibrium at a pH of 7.40. In light of this, the molar ratio of CO₃²⁻ to HCO₃ is 1:1.

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Answer: 7.52*10^23 molecules.

Explanation: This is a classic Stoichiometry problem.

In one mole of any substance, there are 6.02*10^23 molecules. This number is called Avogadro's number. We are given 55 grams of Co2 so to convert that to moles, we divided by the molar mass of Co2. We find the molar mass by adding the molar masses of the elements that make up the compound.

There is one molecule of Carbon and two molecules of Oxygen in one molecule of Co2. From the periodic table, the molar mass of Carbon is 12.01 and 16.00 for Oxygen. 1(12.01)+2(16.00) gives us the molar mass. We then divided 55 grams by that mass to find the number of moles. We then multiply the number of moles by Avogadro's number (6.02*10^23) to find the total number of molecules.

You can use this method for solving any problem that asks you to find the number of atoms or molecules of some number of grams of a substance.

The alkyl halide product is insoluble in water is reagent (or compound) causes the observed visual change in positive Lucas test.

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The following choices which is an example of adaptive radiation is the ancestor species of the honeycreepers was blown over to the Hawaiian Islands from North America or Asia during a storm and populations gradually underwent natural selection, each isolated population became a different species which is denoted as option C.

This is referred to as an evolutionary process that produces new species from a single, rapidly diversifying lineage.

It occurs as a result of factors such as natural selection such as in the case of honeycreepers who underwent it and each isolated population becoming a different species.

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The solubility of PbI2 in 0.025 M KI is 4.5 × 10^-2 M, which is answer choice A.

A substance's solubility in chemistry refers to its capacity to combine well with another substance—the solvent—to form a solution. The ability of the solute to produce such a solution is required for solubility, which is the opposite attribute.

The concentration of the solute in a saturated solution, a solution in which no more solute can be dissolved, is the standard measurement of the solubility of a material in a particular solvent.

To calculate the solubility of PbI2 in 0.025 M KI, we can use the expression for Ksp, which is the equilibrium constant for a solid substance dissolving in a solution. The expression for Ksp is [Pb2+][I-]^2 = Ksp. Since we know the Ksp value for PbI2 and the concentration of I- ions in the solution, we can use this expression to calculate the solubility of PbI2.

Given that Ksp(PbI2) = 7.9 × 10^-9 and [I-] = 0.025 M, we can substitute these values into the Ksp expression:

[Pb2+][I-]^2 = 7.9 × 10^-9

Solving for [Pb2+], we get:

[Pb2+] = sqrt(7.9 x 10^-9 / 0.025) = 4.5 × 10^-2 M

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Two gases that do not react with each other are placed in the same container, they will mix completely with each other. This can be solved using the concept of gaseous mixture.

The ability of gases to mix with one another is one of their characteristics. As a result, they combine to form a solution, or a homogenous combination. If we know the makeup of the gases in the mixture, it is simple to determine some of the characteristics of the combination. Each element in the gas phase of a combination of gases can be handled independently.

When a mixture of gases is kept in the same container, each gas has that container's volume.

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Answer:c= 21 k=294 height= 6.2 volume= 0.78

Pyridinium chlorochromate is the best choice for oxidizing a primary alcohol to an aldehyde.

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a) The rate of change of volume with respect to pressure is -C/P².

b) The P is in the denominator and when the denominator will increase, the value of the function will decrease.

c) The formula for isothermal compressibility in terms of P is 18/P.

When a gas is maintained at a constant temperature, it behaves according to Boyle's Law, a fundamental chemistry principle. According to the law, a gas's volume is inversely related to the pressure it exerts at a given temperature.

a. According to the Boyle's law, we have

PV = C

V = C/P = CP⁻¹

So using the chain rule, the rate of change of volume with respect to pressure is

dV/dP = C×(-1P⁻¹⁻¹)

dV/dP = C×(-1P⁻²)

dV/dP = -C/P²

(b) From the formula for dV/dP, we see that as P increases,

the absolute value of dV/dP decreases

Given that P is in the denominator, the value of the function will decrease as the denominator increases. Consequently, the volume starts off rising more quickly.

thus the volume is increasing more rapidly at the begininh.

(c) The formula for the isothermal compressibility is given by

β = -1/V dV/dP
β = -1/V (-C/P²)

β = C/VP²

β = C/PV.P

β = C/C.P

β = 18/P.

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Spontaneous processes are often said to be "downhill" in free energy because they release energy in the form of heat and/or work.

The energy released during a spontaneous process is represented by a decrease in the free energy (ΔG) of the system. Free energy is a thermodynamic function that takes into account both the internal energy (U) and the entropy (S) of a system. A spontaneous process occurs when the free energy of the system decreases, which means that the internal energy of the system decreases and/or the entropy of the system increases. The free energy of a system is also related to the potential energy of the system. The potential energy of a system is the energy it possesses as a result of its position or configuration. When a system undergoes a spontaneous process, the potential energy of the system decreases, just like the free energy. Imagine a ball placed on a hilltop, the ball has potential energy because of its position, and that potential energy can be converted into kinetic energy when the ball is allowed to roll down the hill. Similarly, the potential energy of a system can be converted into heat or work during a spontaneous process. Therefore, spontaneous processes are often described as "downhill" in free energy because they involve a decrease in the potential energy of the system, similar to a ball rolling downhill. The decrease in potential energy of the system is accompanied by the release of energy in the form of heat and/or work, which makes the process spontaneous.

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Option (b) is correct. The sum of the bond enthalpies of the bonds in the reactant is less than the sum of the bond enthalpies of the bonds in the product.

Bond enthalpy is also known as bond-dissociation enthalpy. Bond enthalpy describes the amount of energy stored in a bond between atoms in a molecule. Bond dissociation enthalpy is the energy that needs to be added for the symmetrical cleavage of a bond in the gas phase. It is the amount of energy required to break one mole of a specific covalent bond in the gas phase. Average bond enthalpies are always positive as breaking bonds always requires energy. It is endothermic. Bond enthalpies are affected by the environment. There are same type of bond can have different bond energies in different environments.

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The most accurate statement about the bonds in reactants and products is The sum of the bond enthalpies of the bonds in the reactant is less than the sum of the bond enthalpies of the bonds in the products.

Bond-dissociation enthalpy is another name for bond enthalpy. The amount of energy held in a bond between atoms in a molecule is known as bond enthalpy. The additional energy required for a bond's symmetrical cleavage in the gas phase is known as the bond dissociation enthalpy. It is the amount of energy necessary to dissolve one mole of a particular covalent bond in gas. Because it always takes energy to break bonds, average bond enthalpies are always positive. There is endothermy. Environment has an impact on bond enthalpies. In various contexts, the same type of bond might have various bond energies.

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Dichloroethylene (C2H2Cl2) has three isomers, each of which is a different substance. The three isomers are: cis-1,2-dichloroethylene, trans-1,2-dichloroethylene, vinyl chloride

1. cis-1,2-dichloroethylene: This isomers has the Cl atoms on the same side of the carbon-carbon double bond. Its Lewis structure would be H3C-CHCl-Cl

2. trans-1,2-dichloroethylene: This isomer has the Cl atoms on opposite sides of the carbon-carbon double bond. Its Lewis structure would be H3C-CCl2-H

3. Vinyl chloride: This isomer has one chlorine atom bonded to the carbon atom double bonded to another carbon atom. Its Lewis structure would be H2C=CHCl

Each of these isomers have different chemical and physical properties. It's worth to mention that these structures are the Lewis Structure which are not always the same as the 3D structure of the molecule.

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I,II and III would be expected have sp2 hybridization on atom A . So the correct option is -I, II and III

sp2 hybridization is a type of chemical bonding in which an atom's three orbitals (one s-orbital and two p-orbitals) mix together to form three hybrid orbitals. These hybrid orbitals are oriented in a trigonal planar arrangement, and each one is directed at an angle of 120 degrees from the other two. In sp2 hybridization, one of the p-orbital remains un-hybridized, meaning that it does not participate in bonding. The unhybridized p-orbital can hold a lone pair of electrons, which gives the molecule its characteristic shape and reactivity.

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the complete question is :

Which of the following would be expected to have sp2 hybridization on atom A? O I and IV O II O I and III O I, II, and III

Answer: C. Both will dissociate.

Explanation: Polar molecules dissociate in water because they can hydrogen bond. This allows them to hydrogen bond with other water molecules which are also Polar. In general, Polar molecules dissolve in other polar solutions.

Ionic compounds dissolve in water because they can form Ion-Dipole interactions. The cation of the Ionic compound attracts the negative part of the water molecule while the anion attracts the positive part of the water molecule.

An enolate is an intermediate in the bromination of ketones under acidic conditions

An enolate is a type of carbanion intermediate that is formed by the deprotonation of a carbonyl group in an aldehyde or a ketone. It has a negatively charged carbon atom that is adjacent to a double-bonded oxygen atom (C=O) in the carbonyl group. Enolate intermediate can be formed by the addition of a strong base to a carbonyl compound, such as lithium diisopropylamide (LDA) or sodium hydride (NaH). Once formed, enolates can participate in a variety of chemical reactions, such as nucleophilic addition and substitution, condensation, and elimination reactions.

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Taking into account the reaction stoichiometry, 11.25 moles of NO can be made when 45 moles of HNO₃ are consumed.

The balanced reaction is:

3 Cu + 8 HNO₃ → 3 Cu(NO₃)₂ + 2 NO + 4 H₂O

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

Iit is possible to use a simple rule of three as follows: if by reaction stoichiometry 8 moles of HNO₃ form 2 moles of NO, 45 moles of HNO₃ form how many moles of NO?

moles of NO= (45 moles of HNO₃× 2 moles of NO)÷ 8 moles of HNO₃

moles of NO= 11.25 moles

Finally, 11.25 moles of NO are formed.

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