how many moles of k are present in 343 ml of a 1.27 m solution of k3po4? group of answer choices 11.1 0.436 1.31 0.145 3.70

Answer:

yes ?

Explanation:

from what I have learned so far, the hair gradually gets thinner and thinner with less oxygen which would change the pressure

The formula for the compound made between gold (Au) with a +1 charge and sulfur (S) is Au(I) S

Gold is called as aurum in latin and hence the symbol Au it is an transition metal and therefore shows transition oxidation states and the +1 oxidation state is written as gold(I) is called as aurous in compound and while +3 state written as (III) is called as auric in compound and gold is chemical element with symbol Au and atomic number is 79 and classified as a transition metal and gold is a solid at room temprature

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Answer:

K₅Mn₅O₁₆

Explanation:

From the question given above, the following data were obtained:

Potassium (K) = 27.5 %

Manganese (Mn) = 37.5 %

Oxygen (O) = 35 %

Empirical formula =?

The empirical formula for the compound can be obtained as follow:

K = 27.5 %

Mn = 37.5 %

O = 35 %

Divide by their molar mass

K = 27.5 / 39 = 0.705

Mn = 37.5 / 55 = 0.682

O = 35 / 16 = 2.188

Divide by the smallest

K = 0.705 / 0.682 = 1

Mn = 0.682 / 0.682 = 1

O = 2.188 / 0.682 = 3.2 = 32/10 = 16/5

K = 1

Mn = 1

O = 16/5

Multiply by 5 to express in whole number

K = 1 × 5 = 5

Mn = 1 × 5 = 5

O = 16/5 × 5 =16

Thus, the empirical formula for the compound is K₅Mn₅O₁₆

The volume of NO produced is 20 L, 89.6 L of nitrogen reacts at STP and  89.6 L of NO can be produced from 32 g of oxygen at STP.

STP stands for standard temperature and pressure. STP refers to a specific pressure and temperature used to report on the properties of matter.

According to IUPAC( International Union of Pure and Applied Chemistry), it is defined as -

It is generally needed to test and compare physical and chemical processes where temperature and pressure plays an important role as they keep on varying from one place to another.

One mole of a gas under STP conditions occupies a volume of 22.4L.

Given,

a. Volume of nitrogen = 10 L

Moles of nitrogen = Volume / 24

= 10 / 22.4 = 0.44 moles

From the reaction, 1 mole of nitrogen gives 2 moles of nitrogen oxide.

So, 0.416 moles will give 2 × 0.44 moles = 0.88 moles

Volume of nitrogen oxide = moles × 22.4

= 20 L

b. Moles of oxygen = 4 moles

1 mole of nitrogen reacts with 1 moles of oxygen.

If moles of nitrogen = 4 moles

Volume = 4 × 22.4 = 89.6 L

c. Mass of oxygen = 32 g

Moles of oxygen = mass  / molar mass

= 32 / 16 = 2 moles

1 mole of oxygen gives 2 moles of NO

So, 2 moles of oxygen gives 4 moles of NO

Volume of NO = 4 × 22.4 = 89.6 L

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Answer:

The heat released when the temperature of 60 g of water decreases from 75 degrees Celsius to 27 degrees Celsius is -12,049.92 J.

Explanation:

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is the amount of heat that a body absorbs or releases without any changes in its physical state or phase change. Sensible heat is measured by the expression:

Q = c * m * ΔT

Where Q is the heat exchanged by a body of mass m, constituted by a substance of specific heat c and where ΔT is the variation in temperature.

In this case:

Replacing:

Q= 4.184 \(\frac{J}{g*C}\) *60 g* (-48 C)

Q= -12,049.92 J

The heat released when the temperature of 60 g of water decreases from 75 degrees Celsius to 27 degrees Celsius is -12,049.92 J.

Lets see

Answer:

Step 1: Calculate the amount of sodium hydroxide in moles

Answer:

it's A I think

Explanation:

hope u pass on this homework

Answer:

The answer is allotropes

Explanation:

As known by studying and research the ansqer came out to be allotropes

The Schrödinger equation describes an atom's electronic wave function and energy levels. n, l, and ml are the three quantum numbers that identify the energy level, shape, and orientation of atomic orbitals. The values of n, l, and ml are integers that must satisfy certain constraints.

The principal quantum number (n) is the first quantum number that defines an atom's energy level. The angular momentum quantum number (l) specifies the shape of the electron cloud in an atom's orbitals. The magnetic quantum number (ml) specifies the orientation of the cloud, which corresponds to the direction of electron spin.

According to the above quantum numbers, the orbital's designation is 4f. The maximum value of l for a given n is n-1. Therefore, when n=4, l can range from 0 to 3, which implies that the atom can have s, p, d, and f orbitals. Because l=3, the subshell is designated f.

This subshell has a complex shape with two nodal planes passing through the nucleus. Furthermore, because ml=-2, the orbital's orientation is determined. It specifies that the subshell is aligned in a plane perpendicular to the z-axis, resulting in four equivalent lobes of electron density oriented in the xy plane.

The 4f orbital is one of the seven f orbitals, which can hold a maximum of 14 electrons. It is not included in the ground-state electron configuration of any of the naturally occurring elements since all elements have filled 1s, 2s, 2p, 3s, 3p, 4s, and 3d orbitals before 4f orbitals become available.

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Hydrocarbons are generally soluble in nonpolar solvents.

Hydrocarbons are generally soluble in nonpolar solvents such as benzene because they have similar molecular characteristics.

Hydrocarbons are molecules composed of carbon and hydrogen atoms that form nonpolar covalent bonds. Since these molecules have no charge, they do not readily dissolve in polar solvents such as water, which is composed of polar covalent bonds with partial positive and negative charges on its atoms.

Benzene, on the other hand, is a nonpolar solvent that is composed of carbon and hydrogen atoms arranged in a symmetrical ring structure. The electrons in benzene are shared equally between its atoms, making it nonpolar and unable to dissolve polar substances.

When hydrocarbons are added to benzene, the nonpolar nature of both substances allows them to mix and dissolve into one another. This is due to the fact that like dissolves like, meaning that polar solvents dissolve polar solutes and nonpolar solvents dissolve nonpolar solutes.

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The release of O₂( oxygen gas) from the process of photosynthesis is made disks to be able to float.

Photosynthesis can be described as the process in which green plants manufacture their food in the presence of sunlight which is trapped by the chlorophyll of the leaves. They are also called primary producers and they use compounds such as water and carbon dioxide.

The spinach leaf disks intake carbon dioxide from a sodium bicarbonate solution and sink to the bottom of a beaker. When the beaker is exposed to light, the disks use carbon dioxide gas and water to produce oxygen gas and glucose. Oxygen gas released from the leaves due to photosynthesis forms tiny bubbles that make the leaves float.

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The glass containing the effervescence tablet has a greater air space than the other.

The term effervescence refers to the evolution of a gas. An effervescence tablet is a tablet that is designed to release the gas called carbon dioxide.

When we add the effervescence tablet and compare the level of the water in the two bowls, we will see that the water in the glass containing the effervescence tablet has a greater air space than the other.

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It is untrue to say that aldehydes have a core carbon bonded to two additional carbons.

The carbonyl group in an aldehyde has a covalent bond on one side with hydrogen and another on the other with carbon. Because the carbonyl carbon in formaldehyde is connected to two hydrogens, it is an exception to this rule.

The simplest aldehyde structure, formaldehyde, often known as methanal, has the formula CH₂O. Ketone molecules consist of a core atom that is joined to two extra carbons via two bonds. It may be formulated using the equation R₂C=O. Acetone (propanone), whose chemical formula is (CH₃)₂CO, is the ketone with the most straightforward chemical structure.

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Answer: An atom can be considered unstable in one of two ways. If it picks up or loses an electron, it becomes electrically charged and highly reactive. Such electrically charged atoms are known as ions. Instability can also occur in the nucleus when the number of protons and neutrons is unbalanced.

Explanation:

The statement, pentoses and hexoses can form stable ring structures by internal hemiacetal formation, is true because pentoses and hexoses are simple sugars that contain multiple hydroxyl (-OH) groups, which can react with the carbonyl (C=O) group to form a cyclic hemiacetal structure.

In the case of pentoses, the most common ring structure formed is a five-membered ring called furanose, while hexoses can form six-membered ring structures called pyranose.

This ring formation involves the reaction between the carbonyl group (C=O) and the hydroxyl group (-OH) of the same molecule, resulting in the formation of an oxygen bridge between two carbon atoms. The resulting cyclic structures are more stable and can be found in many important biomolecules such as nucleotides and carbohydrates.

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Dilute acetic acid solutions can be considered a safety hazard due to their corrosive nature. Corrosive substances have the potential to cause damage to living tissues upon contact. Acetic acid is a weak acid but can still cause corrosion, leading to tissue damage. Correct answer is option A

When in contact with the skin, eyes, or mucous membranes, dilute acetic acid can cause severe irritation, burns, and corrosion. It can disrupt the cellular structure of tissues, leading to tissue damage and potential long-term consequences.

While options B (irritant), C (eye damage), and D (severe burns) are all associated with the properties of acetic acid, the term "corrosive" better captures the potential harm caused by its corrosive properties. Corrosive substances have the ability to cause damage beyond simple irritation, such as tissue destruction and chemical burns.

Option E, stating that the solution is considered nonhazardous, is incorrect. Dilute acetic acid solutions should be handled with caution due to their corrosive nature and potential for causing harm to human tissues.

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A) HCl

Dispersion forces are present in all molecules, as they result from temporary fluctuations in electron density. Dipole-dipole forces, on the other hand, are present in molecules with permanent dipole moments.

HCl has both dispersion forces and dipole-dipole forces because it has a permanent dipole moment due to the electronegativity difference between hydrogen and chlorine atoms, which results in partial positive and negative charges on the respective atoms. This dipole moment results in dipole-dipole forces, while the molecule also has dispersion forces due to temporary fluctuations in electron density.

Out of the given options, only HCl has both dispersion forces and dipole-dipole forces.

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Rounding to the appropriate number of significant figures, we get: Partial pressure of helium ≈ 1.04 * 10^4 kPa

To find the partial pressure of helium in the Trimix 10/50 gas mixture, we need to calculate the fraction of helium in the mixture and then multiply it by the total pressure.

The Trimix 10/50 gas mixture contains 50% helium, which can be represented as 0.50 in decimal form. The total pressure of the gas mixture is given as 2.07 * 10^4 kPa.

To find the partial pressure of helium, we multiply the fraction of helium (0.50) by the total pressure (2.07 * 10^4 kPa):

Partial pressure of helium = 0.50 * 2.07 * 10^4 kPa

Calculating this expression gives us:

Partial pressure of helium = 1.035 * 10^4 kPa

Rounding to the appropriate number of significant figures, we get:

Partial pressure of helium ≈ 1.04 * 10^4 kPa

Therefore, the correct answer is:

D. 1.04 * 10^4 kPa

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Ion have positive as well as negative charges. Ions do not have neutral charge. Atoms posses neutral charge.

There ions have only positive and negative charges.

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The energy is coming from the battery that is in the torchlight.

In the case of an object in motion, energy is coming from the kinetic energy of the object. Kinetic energy is the energy an object possesses due to its motion. This energy is transferred to the object by an external force, such as a push or a pull, which causes the object to start moving or to change its motion.

Energy is the ability to do work and can take many forms, such as thermal, kinetic, potential, and chemical energy. Energy can be transformed from one form to another and can also be transferred from one object to another.

Therefore, In the case of an object being put into motion, energy is coming from the potential energy of the object. Potential energy is the energy an object possesses due to its position or configuration. This energy is transferred to the object by an external force, such as gravity, which causes the object to start moving or to change its motion.

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When an electron quickly occupies an strength state increased than its ground state, it is in an excited state. An electron can end up excited if it is given greater energy, such as if it absorbs a photon, or packet of light, or collides with a close by atom or particle.

1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d⁵ is the electronic configuration of Cr. the correct answer is D.

There are 24 electrons in all, according to the electron arrangement. A neutral atom will contain 24 protons if it has 24 electrons. The element is determined by its proton count. Chromium, symbol Cr, is the 24th element.

Since Cr contains 24 protons and the +2 charge would result in the nucleus having 26 protons, Cr²⁺ is invalid.  Cu is made up of 29 protons. The copper would be Cu⁵⁺ as there are only 24 electrons. Cu²⁺ was rejected for the same reason.

Therefore, 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d⁵ is the electronic configuration of Cr.

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The two ways in which the physical state of matter can be changed are melting and freezing.

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Answer:

releases energy from the food for us to use

Explanation:

The hydrolysis of sucrose to glucose and fructose is exergonic. However, if sucrose is dissolved in water and the solution is kept overnight at room temperature, there is no detectable conversion to glucose and fructose because the activation energy of the reaction is high.

Hence, Option (B) is correct answer.

The minimum amount of energy that must be provided by a reacting molecules to get converted into the product is called Activation energy.

It is expressed as:

\(k = Ae^{\frac{-E_a}{RT}}\)

where,

k = rate constant

A = pre-exponential factor

Eₐ = activation energy

R = universal gas constant

T = absolute temperature in K

Thus from the above conclusion we can say that The hydrolysis of sucrose to glucose and fructose is exergonic. However, if sucrose is dissolved in water and the solution is kept overnight at room temperature, there is no detectable conversion to glucose and fructose because the activation energy of the reaction is high.

Hence, Option (B) is correct answer.

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Disclaimer: The question was given incomplete on the portal. Here is the complete question.

Question: The hydrolysis of sucrose to glucose and fructose is exergonic. However, if sucrose is dissolved in water and the solution is kept overnight at room temperature, there is no detectable conversion to glucose and fructose. Why?

A. The change in free energy of the reaction is positive.

B. The activation energy of the reaction is high.

C. The change in free energy of the reaction is negative.

D. This is a hydrolysis reaction, so it requires an input of energy.

E. The free energy of the products is higher than the free energy of the reactants.

3D view of H3O+

The stronger line means that the Hydrogen is closer to us in a 3D view, meanwhile the line with traces, or you cal also see as a weaker line, it means that the Hydrogen is farther from us in a 3D view

Lewis Structure of H3O+

Answer:

No, i will not use a water pipe consisting of the two metals

Explanation:

Looking at the reduction potential of the both metals, it is clear that an electrochemical cell is set up with iron as the anode and copper as the cathode.

This will make the iron to quickly corrode and eventually destroy the water pipe. It is better to have a set up in which another metal that is higher than iron in the electrochemical series is combined with it.

Therefore, the mole fraction of methanol is 0.941. To calculate the mole fraction of methanol, you need to know the number of moles of methanol and glycerine present in the solution.

First, we need to calculate the number of moles of methanol in the solution. To do this, we use the molar mass of methanol (32.04 g/mol)

130g / 32.04g/mol = 4.05 moles

We also need to calculate the number of moles of glycerine in the solution. To do this, we use the molar mass of glycerine (92.09 g/mol)

23.5g / 92.09g/mol = 0.2555 moles

The mole fraction of a component is calculated by the number of moles of that component divided by the total number of moles in the solution.

Mole fraction of methanol = moles methanol / (moles methanol + moles glycerine)

= 4.05 moles / (4.05 moles + 0.2555 moles)

= 0.941

Therefore, the mole fraction of methanol is 0.941.

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Answer:

C

Explanation:

It was the first to show that the atom had no net charge.

Answer:

2.835 moles of carbon

Explanation:

By definition, there are 6.022x10^23 atoms (or compounds) in one mole.

Write and use this as a conversion factor:

(6.022x10^23 atoms)/mole

(1.707 x 10^24 atoms of carbon)/((6.022x10^23 atoms)/mole) = 2.835 moles carbon