How much heat is needed to convert 40.0 grams of CH₃OH(s) at -97.53˚C to CH₃OH(l) at -43˚C?

The isotopes of element X are  52X (90.00%, atomic mass: 52.04 amu),  4⁹X (8.00% abundant, atomic mass:  48.99 amu), 5ºX (2.00% abundant, atomic mass:  50.09 amu). X has average atomic mass of 151.12 amu.

Isotopes are atoms containing the same atomic mass but differing numbers of neutrons. They differ in mass, which affects their physical characteristics even if they have nearly identical chemical properties.

High-speed particles can be fired into an atom's nucleus to achieve this. The nucleus may either absorb the electron by becoming unstable and emit one when it is struck. In either scenario, the nucleus's particle count would change, resulting in the creation of an isotope.

Briefing:

To solve a problem like this, we can multiply mass of each isotope by the percentage abundance of that isotope

Add all the amu

52.04amu +  48.99 amu + 50.09 amu= 151.12 amu.

The average atomic mass of element X is  151.12 amu.

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The direction of electron flow from the anode and the cathode is the when the current is flow in the opposite direction.

An electrochemical cell have the a cathode and an anode. the anode one is the positively charged and the an anode one is negatively charge. so, the electron flow from the anode to the cathode that is the positively charged end to the negatively charged end and the current will flow in the opposite to direction.

The direction of the current is from the cathode to the anode. the electrochemical  cell is non spontaneous and is called as electrolytic cell.

The question is incomplete, I answer the question in general according to my knowledge.

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The Molar concentration for the H2SO4 titrated against base is 8.55M.

Molar concentration=MV=0.90 x 19=17.1

Titrated against 2 mol base so dividing the molar concentration with 2 and finally getting required result.

New molar concentration=17.1/2=8.55M

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Answer: a. n = 3, l = 2: The subshell in which electrons with these quantum numbers are found is the d subshell.

b. n = 1, l = 0: The subshell in which electrons with these quantum numbers are found is the s subshell.

c. n = 4, l = 3: The subshell in which electrons with these quantum numbers are found is the f subshell.

d. l = 3: It is not possible to determine the subshell in which electrons with this quantum number are found, as the principal quantum number "n" is not specified. The angular momentum quantum number "l" only specifies the shape of the orbital, not the energy level or subshell.

Explanation:

In virtually every stable compound, each of the atoms has achieved an electron configuration analogous to that of the noble elements.

Noble elements are those which have completely filled orbits, they are highly stable compounds, they do not react under normal conditions.

All the chemical compounds and elements have tendency to be stabilized by achieving the nearest inert electronic configuration.

They are classified as non-metals and they come under p-block elements. They have a complete octet; therefore, their electronic configuration is n[tex]s^{2}[/tex]n[tex]p^{6}[/tex],Their ionization enthalpy has a very high value, but xenon can react with highly electronegative atoms like oxygen and fluorine to form corresponding xenon compounds.

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Water, ice, acids, salts, plants, animals, and temperature fluctuations are all mechanical weathering agents. Erosion is the process by which the broken pieces of rock and mineral are moved away after a rock has been cracked.

Rocks that have holes or are porous (have holes) experience freeze-thaw weathering (allows water to pass through). In this case, mechanical weathering is evident. Different fissures in the rock allow water to enter (from rain, melting snow, or ice).

Weathering that releases pressure. Definition. expansion associated with the release of confining pressure when deeply buried rock is unroofed, leading to the development of fractures near the surface of solid rock. Typically, fractures spread along surfaces parallel to and near the surface.

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The decreasing order of lattice energy realesed is GaN>CaS>LICI>RbBr.

The lattice energy depends on the following two factors. They are product of charges of the compound and radius of the ions.

Higher the charge of ions, higher will be the lattice energy. Smaller the radius of ion, larger will be the lattice energy.

Consider the given compounds as follows: LiCl, CaS, GaN and RbBr

The charges of ions of given compounds are Li⁺, Cl⁻, Ca²⁺, S²⁻, Ga³⁺,N³, Rb⁺ and Br⁻. So, in the given compounds GaN has higher lattice energy. After GaN, CaS has higher lattice energy. Out of two compounds LiCl and RbBr, Li has less ionic well as ionic radius than Rb. Since in groups from top top to bottom atomic size increases as well as ionic radius.

Therefore, LiCl has higher lattice energy than RbBr.

Hence, the decreasing order of lattice energy realesed is GaN> CaS>LICI>RbBr

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In 1939, 740 migrant ship passengers were turned away from London city port, despite having immigration papers.

In 1939, the passenger ship MS St. Louis was carrying 740 Jewish refugees who had fled Nazi-occupied Europe and were seeking asylum in the United States. The ship had been turned away from Cuba, and when it arrived in Miami, the U.S. government also refused to allow the passengers to disembark.

The ship then headed to Canada and was turned away from Montreal. Finally, it arrived in the port of London, where it was also denied permission to land. The passengers were forced to return to Europe, and many of them later died in the Holocaust. The incident is a tragic example of the difficulties faced by Jewish refugees during World War II and the lack of political will to provide them with a safe haven.

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Since chlorine only has 17 electrons, the atoms 1+ and 2+ require argon & potassium, that have 18 and 19 electrons, respectively. We require the atoms S- & P-2, which have 16 & 15 electrons respectively, for 1 and 2.

When the number of protons within the nucleus is different from the amount of electrons around that nucleus, an electrical charge is created in the atom of matter. A negative charge is present in an atom if it contains more electrons than protons. A positive charge is present in an atom if there are more protons than electrons.

Ampere-second or Coulomb are the SI units for measuring charge.

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Answer: 13.175

Explanation:

[tex]\text{Molarity}=\frac{\text{moles of solute}}{\text{liters of solution}}[/tex]

To find the moles of solute, we begin by finding the formula mass of NaOH.

This means 527 grams of NaOH is equal to [tex]\frac{527}{40}=13.175[/tex] moles.

So, the molarity is [tex]\frac{13.175}{1}=13.175 \text{ M}[/tex]

The reaction occurs at constant pressure, - 385.89 kJ amount of heat is released during the reaction.

The heat released by any reaction will be calculated as:

ΔH = ΔH of products -  ΔH of reactants

Given chemical reaction is:

2CH₄ + 5F₂ → 2CF₄ + 2HF

From the stoichiometry of the reaction, it is clear that,

2 moles of CH₄ = react with 5 moles of F₂

1 moles of CH₄ = react with 5/2 moles of F₂

So, 0.610 moles of CH₄ = react with 0.610×5/2=1.525 moles of F₂

Given moles of F₂ = 0.760moles, which is less as compared to the calculated moles so for this reaction F₂ is the limiting reactant.

From the stoichiometry:

5 moles of F₂ = produce 2 moles of CF₄ & HF each

0.760 moles of F₂ = produce 2/5×0.760=0. 304moles of CF₄ & HF each

From the stoichiometry of the reaction, it is also clear that 0.. 304 moles of CF₄ & HF each require 0.176 moles of CH₄.

We know that the value of heat of formation of the below molecules is as:

CF₄ = -74.8kJ/mole

HF = -271.1 kJ/mole

CF₄ = -925.0 kJ/mole  

F₂ = 0

Now we put all these values on the above equation with their respective moles, and we get

ΔH = (0.176 x -271.1 kJ/mole + 0.176 x -925 kJ/mole) - (0.176 x -74.8 kJ/mole) = - 389.95 kJ

Hence, - 385.89 kJ amount of heat is released.

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The strong acid and strong base has high rate constant of dissociation. The rate constant for weak acid and base for the dissociation is low, they do not easily dissociate in water. Therefore, when a base is made into an aqueous solution, it is called alkali.

Acid is a solution which releases H⁺ hydrogen ion when dissolved in water. Base releases hydroxide ion OH⁻ ion when dissolved in water.

pH is a measurement of amount of hydronium ion H₃O⁺ in a given sample. Strength of acidic nature is directly proportional to the concentration of hydronium ion. when a base is made into an aqueous solution, it is called alkali.

Therefore, when a base is made into an aqueous solution, it is called alkali.

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If the pressure on a gas increased then its a volume will decrease because gas molecules will pushed closer together, the data support the hypothesis.

If the volume of the gas decreases, the molecules strike the walls more frequently, raising the pressure; conversely, if the volume grows, the distance the molecules must travel to strike the walls increases, and they strike the walls less frequently, lowering the pressure.

Gases have the ability to expand to fill almost any volume and can be compressed to minuscule fractions of their original capacity. When gas molecules are forced together to the point where they meet, the material becomes liquid. Cooling a gas and compressing it are two methods for turning it into a liquid.

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The complete question is as follows:

If the pressure on a gas is increased, then its volume will decrease because the gas molecules will be pushed closer together. Did the data support the hypothesis (above)? Justify your answer. Sample Justification: As weight was added to the top of a syringe, the volume of the air trapped in the syringe decreased. The weight and the surface area of the plunger were used to calculate pressure. As more weight was added, the pressure increased. The volume decreased in response. Did you mention that adding weight increased the pressure? Did you mention that volume decreased as the pressure increased?

There are more actual collisions between the reactant particles. We anticipate that the first step is the rate-determining step if the rate law is rate=k[A][B].

[C] has no effect on the reaction rate. On the other hand, we anticipate the second step to be the rate-determining step if the rate law is rate=k[A]B]C]. The following is the empirically discovered rate rule for ozone depletion: k [O3] = rate. A mechanism must be in accordance with the rate law discovered through experiment. The number of collisions increases as the temperature rises. The frequency of reactant collisions increases as a reactant's concentration rises, which in turn accelerates the rate of the reaction.

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Answer:

Pressure Increases With Depth The weight of the water above a diver exerts pressure on their body. The deeper a diver descends, the more water they have above them, and the more pressure it exerts on their body.

Explanation:

pH of the solution is the negative logarithm of its H+ ion concentration. Nitric acid solution contains equal-molar H+ and nitrate ions. The pH of 0.380 M HNO₃ solution is 0.42.

pH of a solution is its measure of H+ ion concentration. It tells how much acidic or basic the solution is. The solution is neutral at a pH of 7 , acidic at pH below 7 and basic above 7.

Mathematically pH is the negative logarithm of H+ ion concentration. HNO₃ ionizes to equal H+ ions and NO₃ - ions. Thus, 0.380 M solution contains 0.380 M H+ ions.

pH = - log [H+]

     = - log (0.380 M)

     = 0.42

Therefore, the pH of the nitric acid solution is 0.42.

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The heat of reaction per mole of BaCl₂ is 366 kJ/mol BaCl₂.

Reaction is a response, typically sudden, to a particular event, situation, or stimulus. It is a type of behavior that occurs as a result of an external force, such as an event, person, or object. Reactions can be physical, emotional, mental, or a combination of all three. Examples of physical reactions include facial expressions, muscle tension, and changes in heart rate and breathing.

The heat of this endothermic reaction can be calculated using the equation q=mc∆T,
where q is the heat,
m is the total mass of the solution,
c is the specific heat capacity of water, and
∆T is the change in temperature.
In this case, the total mass of the solution is 300 mL and the change in temperature is (45.0°C - 15.8°C) = 29.2°C.
The specific heat capacity of water is 4.18 J/g°C.
Therefore, the heat of the reaction is q = (300 mL)(4.18 J/g°C)(29.2°C) = 366 kJ.
Since the reaction is 1 mole of BaCl₂,
The heat of reaction per mole of BaCl₂ is 366 kJ/mol BaCl₂.

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The specifications that would not have to be sued to make the specification would have to be: .Leaves found in deciduous forest --- Leaves found in tropical forest Option B

Trees that drop all of their leaves annually make up the majority of a deciduous forest. Eastern North America, western Eurasia, and northeastern Asia are the three primary locations for this kind of forest. All of these regions have a winter season and a moderate environment.

These trees' leaves fall off each fall, thus the name "deciduous," which means "falling off." Wide, flat leaves are characteristic of most broad-leaved deciduous plants. As they expand, the branches of the trees generally take on a rounded form.

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answer key

1.Circular shaped leaves --- Irregular shaped leaves

2.Leaves found in deciduous forest --- Leaves found in tropical forest

3.Leaves symmetrical on stem --- Leaves asymmetrical on stem

4.Leaves bunched on stem --- Single leaf on stem

In this reaction, CuSO₄₍s₎ + 2HI₍aq₎ are reactant . Copper sulphate present in solid state and HI is present in aqueous state. Therefore, option B is correct.

Copper sulfate is used in agriculture and non-agricultural settings as a fungicide, algaecide, root killer, and herbicide. It's also an antimicrobial and a molluscicide. Individual products containing copper sulfate have a wide range of applications.

Copper and sulfuric acid are the two main ingredients used to make copper sulphate, but simply adding copper to a diluted acidic solution will not promote the oxidation reaction.

When pure copper sulphate is kept in water, it begins to dissolve, and a small amount of heat energy is released during the process. Its color changes to blue as 5 molecules of water cling to it.

Thus, option B is correct.

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Answer:

reacrans

Explanation: you are correct lol

According to VSEPR theory , bond angles in organic compounds are generally close to 109°, 120° or 180°.

Hybridization is defined as the mixing of two atomic orbitals which give rise to a new hybridized molecular orbital.

The hybrid orbitals so formed are different in energies and shapes. Equal energy atomic orbitals take part in hybridization. Since, valence bond theory failed to correctly predict the molecular structure, hybridization helps to understand the concept of bond formation, bond energies and bond lengths.

The shape of a molecule can be predicted from the electron pairs that surround the central atom by using Valence Shell Electron Pair repulsion (VSEPR) theory. This theory is based on the assumption that for a molecule to take a shape, its electronic repulsion should be minimized. That is why, according to experimental findings the angles between atoms of organic compounds are generally close to 109°, 120° or 180°.

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86,472.46 J

The heat required to melt ethanol can be calculated using the formula:

heat = mass × heat of fusion

After plugging in the values ​​it looks like this:

Heat = 199 g × 109.1 J/g

= 21489.9

In order to heat the molten ethanol to a higher temperature, the heat capacity of ethanol must also be considered. The heat capacity of ethanol is 2.44 J/g × degree Celsius. To bring the molten ethanol to a sufficient temperature, we need to know the desired final temperature and the initial temperature (the melting point of ethanol, -114.1 degrees Celsius). Let's say the desired final temperature is 25 degrees Celsius.

The heat required to raise the temperature of molten ethanol can be calculated using the formula:

heat = mass × heat capacity × (final temperature - initial temperature)

After plugging in the values ​​it looks like this:

Heat = 199 g × 2.44 J/g degrees Celsius × (25 degrees - (-114.1 degrees))

= 199 g × 2.44 J/g degrees Celsius × 139.1 degrees

= 64982.56 J

add 21489.9 J + 64982.56 J = 86,472.46 J

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Answer:

The ONLY compound that has polar bonds is CF4

Explanation:

Any elements or free atoms DO NOT have any polar bonds, they only have London Dispersion Forces, which is not considered a polar force.

Only Dipole-Dipole and Hydrogen Bonds are considered to make a molecule polar. CF4 has dipole-dipole bonds (In addition to London Dispersion Forces) Making it Polar.

Cl2, F2, H2 ONLY have London dispersion which means it is not polar

Hope this helps,

The wavelength of a photon is 622nm and it is a red light.

The length of a waveform signal that is propagating in space or over a wire is measured by the separation between identical points (adjacent crests) in the adjacent cycles. This length is typically specified in meters (m), centimetres (cm), or millimetres (mm) in wireless systems (mm).

A discrete bundle (or quantum) of electromagnetic (or light) energy is referred to as a photon. Photons move at the speed of light (3 108 m/s) because they have no mass.

λ = v/f

where, f = frequency = 4.82 × [tex]10^{14} Hz[/tex]

v = speed of light = 3 × [tex]10 ^{8}[/tex] m/s

λ = 3 × [tex]10^{8}[/tex] / 4.82 × [tex]10^{14}[/tex]

λ = 6.22 × [tex]10^{-7}[/tex]

λ = 622 nm.

Hence, the wavelength of a photon is 622nm and it is red light.

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The masses that we need for the reaction are 261.6 g Zn; 630 g [tex]HNO_{3}[/tex]

We know that the place to begin when we are talking about a reaction is to be able to put down the equation of the reaction and this would help us so as to find what we are looking for.

In this case, the equation of the reaction can now be written as;

[tex]Zn (s)+ 2HNO_{3} (aq) ---- > Zn(NO_{3} )_{2} (aq) + H_{2} (g)[/tex].

Using the relation;

Number of moles = mass/molar mass

=  261.6 g/65 g/mol

4 moles

Number of moles of nitric acid = 630 g/63 g/mol

= 10 moles

Thus, we can see from the stoichiometry of the reaction that has been shown in the equation here that we need 261.6 g Zn; 630 g [tex]HNO_{3}[/tex] so as to obtain the required 00 g of ammonium nitrate as it is in the question that we have above.

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The concentration of the KOH=  0.15M.

What is concentration?

The concentration of a substance, such as salt, in a particular volume of tissue or liquid, such as blood. The substance concentrates when there is less water present.

What is stock solution?

A solution that has been diluted to a lower concentration and will be used. The default strategy could be used independently or as a component of a more complex solution. A working solution is the option we ultimately settle on.

M stock V stock = M dilute V dilute

25ml* 6M = M* 1L * 1000ML/1L

25Ml*6M/1000Ml = M

M dilute = 0.15M

Concentration of KOH = 0.15M

Therefore, the concentration of the KOH=  0.15M.

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1. Diethyl malonate, NaOC2H5, C2H5OH 2. NaOH, H2O 3. H3O+, heat :

The malonic is the method of the synthesis for preparing the carboxylic acid from the alkyl halides. the alkyl halide are also called as the haloalkanes. one or more alkyl hydrogen atom are replaced by the halogen such as : fluorine, chlorine, bromine, iodine from the alkane compound. the halogen substituted alkanes are called as alkyl halide.

Thus, the alkyl halide form the carboxylic acids by the method of the malonic ester synthesis. the image is attached with the structure of the compounds.

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The central atom in the iodite ion, IO21-, is surrounded by two bonding pairs and two unshared pairs of electrons.

The center atom in a molecular formula is often the atoms with the smallest subscript and the largest bonding potential. The lowest electronegative atom is normally the central atom when all the atoms typically make the same number of bonds. The main ion in K3[Fe(CN)6] is Fe3+. These central atoms & central ions serve as Lewis acids, or acceptors of a electron pair.

Here, the oxygen atom at the center has undergone hybridization. So there are 3 2p orbitals and a 2s orbital when we look at the creation of the water molecule. The 4 sp3 hybrid orbitals are produced by these together.

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Answer: 0.101

Explanation:

Using the fact that molarity = (moles of solute)/(liters of solution), there are [tex](0.150)(35.5/1000)=0.005325[/tex] moles of barium hydroxide.

There are 2 moles of hydroxide ions per mole of barium hydroxide, meaning that there are [tex](0.005325)(2)=0.01065[/tex] moles of hydroxide ions.

To neutralize the solution, the number of moles of hydrogen ions must be equal to the number of moles of hydroxide ions.

Since there is 1 mole of hydrogen ions per mole of nitric acid, we need 0.01065 moles of nitric acid.

Substituting into the molarity formula yields that the concentration is [tex]\frac{0.01065}{0.105}=0.101[/tex] M.

The answer which best describes type of solid the elements and compounds below form, in that order Kr , CH₃OH , BaBr₂ , Diamond are : the correct option is e ) atomic , molecular , ionic , network.  

The solid Kr is atomic in nature. Kr is represent the atom. The compound   CH₃OH is of molecular type. the OH group is attached to the carbon atom with covalent bond. so,  CH₃OH is the molecular compound. The compound BaBr₂  is the ionic compound , the bond present in the BaBr₂  is the ionic compound, that is the bond formed by the complete transfer of the electron. The diamond is the example of the network solid.

Thus, the correct option is :  atomic , molecular , ionic , network.

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The forecast for California would be windy with rainy conditions.

What is pressure?

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