A student prepares a standardized solution of sodium hydroxide by the following procedure. The student first prepares a saturated solution of sodium hydroxide using freshly distilled or deionized water. She measures about 5 mL with a graduated cylinder and dilutes to 1 L in a plastic bottle with freshly distilled or deionized water to make a solution that is about 0.1 M. To determine the exact concentration she puts the NaOH solution in a buret and titrates a carefully-weighed pre-dried solid acid of known molar mass. She records the volume of NaOH needed to neutralize it and repeats the process several times to determine the concentration of the NaOH solution. She calculates the concentration and uncertainty in the concentration of the NaOH from the titration data. Why can\'t the student just weigh the sodium hydroxide directly to make a standard? Select all that apply. NaOH pellets react with water. NaOH pellets react with oxygen. NaOH pellets react with hydrogen. NaOH pellets react with carbon dioxide. NaOH pellets react with nitrogen. Why did the student first prepare a saturated solution? A. Saturated solutions are higher in purity than unsaturated solutions. B. Unsaturated NaOH solutions are light-sensitive. C. She can calculate the concentration of the saturated NaOH solution from the Ksp of NaOH. D. Any sodium hydrogen carbonate formed by the reaction of NaOH with atmospheric carbon dioxide will precipitate in the saturated solution. The student prepares the NaOH solution of high purity but unknown concentration by taking about 5 mL of the supernatant at the top of the saturated solution adding it to a plastic bottle with about 1 L of freshly distilled or deionized water. The bottom of the solution contains some white solids which are likely to be (select all correct answers): sodium hydroxide sodium hydrogen sulfate sodium silicate CO2(s) H2O(s) phthalic acid sodium hydrogen carbonate Why is a plastic bottle is generally preferred to glass bottle during the above step? A. The reaction between sodium hydroxide and plastic produces plastic hydroxide. B. Sodium hydroxide renders plastic inert by a process called passivation. C. Sodium hydroxide reacts slowly with glass, forming sodium silicate. D. Sodium hydroxide reacts with polyethylene. The concentration of saturated NaOH is 50.0% w/w and the density is 1.52 g/mL. If exactly 4.00 mL were diluted to 1.000 L, what would be the concentration? Why is potassium acid phthalate (KHC8H4O4, MM = 204.227 g/mol) so widely used as a standard in acid-base titrations? Select all that apply. It is stable to air It is expensive It is easy to dry It has a slowly changing pH at the equivalence point It has a relatively high molar mass It is available in high purity A student dries the pure potassium acid phthalate (KHC8H4O4) in the oven overnight to A. remove water B. purify the matrix C. remove carbon dioxide adn sulfer dioxide D. anneal the crystal structure She weighs 0.1553 g of dry potassium acid phthalate into a flask and adds some water from a graduated cylinder to dissolve it. Why doesn\'t she measure the volume of water with a more accurate device? A. The accuracy of the graduated cylinder is sufficient to measure to two decimal places which is all the precision needed for a titration. B. It would be better to measure the mass because it can be read to four decimal places with an analytical balance. C. The quantity of water actually is important and should be measured accurately because it affects the starting concentration thus the starting pH of the solution. D. The volume of water added is not important because the titration equivalence point depends only on the number of millimoles of potassium acid phthalate and not its concentration. The titration of 0.1553 g of dry potassium acid phthalate (MM = 204.227 g/mol) requires 49.84 mL of NaOH solution. What is the concentration of the NaOH solution? Why is freshly distilled or deionized water used in this standardization? A. Freashly distilled water contains no hydrogen peroxide B. Distilles water contains calcium, which stabilizes the sodium hydroxide C. Freashly deionized water has a pH of 4.72 D. There is little CO2 in freshly deionized or distilled water

Hydrogen fluoride, HF has the strongest individual hydrogen bonds between its molecules.

An inorganic substance with the chemical formula HF is hydrogen fluoride. The main industrial source of fluorine is this colorless gas or liquid, which is frequently an aqueous solution known as hydrofluoric acid.

Aluminum, plastics, electrical components, pharmaceuticals, high-octane fuel, fluorescent light bulbs, and refrigerants are all made with hydrogen fluoride. The production of refrigerants uses 60% of the hydrogen fluoride used in manufacturing.

The difference in charge between hydrogen ions that are slightly positive and other hydrogen ions that are slightly negative results in hydrogen bonds, which are electrostatic forces that attract. Hydrogen bonds form between nearby hydrogen and oxygen atoms of adjacent water molecules in the case of water.

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The standard emf of a galvanic cell made of a Ni electrode in a 1.0 M Ni(NO₃)₂ solution and a Cr electrode in a 1.0 M Cr(NO₃)₂ solution at 25 °C is 0.51 V.

the reduction potential of Ni²⁺ = - 0.23

the reduction potential of Cr³⁺ = - 0.74

the reduction potential of the Ni²⁺ is higher than the reduction potential of Cr³⁺. that mean  Ni²⁺ undergoes the reduction.

the standard emf cell expression is given as follows :

the standard emf cell , E = E Ni²⁺/Ni - E  Cr³⁺ / Cr

                                         = - 0.23 - ( - 0.74 )

                                         = - 0.23 + 0.74

                                         = 0.51 V

Thus, The standard emf of cell is 0.51 V.

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This indicates that hyaluronic acid clots in the presence of acetic acid.

The ability of hyaluronidase to prevent the development of a tight mucus clot with acetic acid shows the existence of highly polymerized hyaluronic acid. In vitro, highly polymerized hyaluronic acid is produced by cultured cells of different mesenchymal tissues. The concentration of hyaluronic acid in freshly prepared, concentrated embryo extract was determined to be between 210 and 240 mcg/ml.

Hyaluronic acid found in embryo extract was depolymerized in tissue culture with days between medium changes.

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The complete question is

A physician attempts to aspirate a knee joint and obtains 0.1mL of slightly bloody fluid. Addition of acetic acid results in turbidity and a clot. This indicates that

Most studied answer

a)the fluid is synovial fluid

b)hyaluronic acid clots in the presence of acetic acid.

c)hyaluronic acid is part of synovial fluid

The key features that should be present in the IR spectrum of your product if you successfully made the desired bromohydrin and the key features that should be absent from the IR spectrum if the starting material was completely reacted are the spectra of the other alcohols.

Spectra of other alcohols used in the synthesis show the presence of bromohydrin. The presence of bromohydrin with a characteristic hydroxyl stretch indicates the presence of alcohol.

Bromohydrin is formed by adding Br and OH to an alkene, the result is known as bromohydrin (bromine = bromine, hydrin = hydrogen, water).

The synthesis of bromohydrins involves highly regioselective ring expansion from epoxides to halohydrins using hydrogen and lithium halides in the presence of cyclodextrin in water as solvent.

A common absorption method for both qualitative and quantitative evaluation is infrared (IR) spectroscopy. Electromagnetic radiation that can change the vibrational and rotational states of covalent bonds in organic molecules is in the infrared region of the spectrum.

so as we know that bromohydrin by Br and OH there should be ir spectrum of Br dan OH in the IR spectrum of product

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The temperature of the mixture does not change at all until all the ice has melted, at which point it increases at a constant rate.

A physical number known as temperature expresses the concepts of hotness and coolness in numerical form. With a thermometer, temperature is measured.

Thermometers are calibrated using a number of temperature scales that have defined distinct reference points and thermometric substances. The most widely used scales are the Kelvin scale (K), which is mostly used for scientific reasons, the Fahrenheit scale (°F), and the Celsius scale (°C), formerly known as centigrade, with the unit symbol °C. In the International System of Units, one of the seven base units is the kelvin (SI).

The lowest temperature on the thermodynamic scale is absolute zero, or 0 kelvin, or 273.15 degrees Celsius. As stated in the third law of thermodynamics, experimentally it can only be very closely approached but not actually reached.

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The specific rotation of the product is + 42.3° . option B is the correct answer

The SN2 mechanism was used to convert (R)-C6H5CHClCH3 into the appropriate alcohol, the end result should be (S)-C6H5CHOHCH3. This is due to the fact that, in the SN2 reaction mechanism, the departing nucleophile prefers to attack from the front side in order to reduce electrical repulsions during the transition state. This results in a complete configuration inversion at the molecules' chiral carbon. The amplitude of a particular rotational value will be the same but with the opposite sign in enantiomers. For instance, if R isomer displays -42.3°, S isomer will display +42.3°.

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The dot structure of Ar will have 6 electron in their valence shell.

Lewis dot structures, also known as electron dot structures, are schematics that show the interatomic chemical bonds in a molecule. Additionally, they show how many lone pairs there are overall in each of the atoms that make up the molecule. Common names for Lewis dot structures include electron dot structures and Lewis structures. Lewis described an acid as an electron pair acceptor, while a base is an electron pair giver.

The electronic structures of the elements, including the electron pairings, are reflected in the Lewis dot structures. Lewis structures can be viewed as "electron bookkeeping" and are a helpful way to condense some bonding-related information. Each dot in a Lewis dot structure corresponds to an electron. A bond is denoted by two dots placed between the atoms in chemical symbols.

Hence, Ar dot structure will be different from neutral Ar atom.

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The same atoms make up tautomers, which are isomers with various electrical and molecular configurations. The associated tautomeric form is the most reliable.

Describe tautomery.

Tautomery is a specific type of isomery caused by a shift in one or more atoms' positions inside the molecule. The molecule electronic distribution and, consequently, the molecular structure are altered by this shift in location.

Tautomerization, the constant interconversion, is what gives equilibrium to the isomeres known as tautomers in solution. The same kind and number of atoms are present in both molecules.

The item in the suggested example has the chemical formula C10H16O3. In isomeric molecules, 6C, 16H, and 3O are essential. The distribution of these atoms, however, fluctuates, changing the structure of the resultant molecule.

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The standard Gibbs energy change for the following reaction is 23 kj mol-1 at 298 k what are the concentrations of ca2 and so42- at equilibrium is 3032K.

What is Gibbs energy ?

The Gibbs free energy, also referred to as the Gibbs function, Gibbs energy, or free enthalpy, is a unit of measurement used to determine the maximum amount of work that can be accomplished in a thermodynamic system when the temperature and pressure are held constant.

What is equilibrium ?

Chemical equilibrium is characterized as a dynamic condition in which the concentration of each reactant remains constant. Even if they aren't equal, they aren't altering. An equilibrium state in a chemical reaction is denoted by a double arrow. Left are reactants, and right are products.

ΔG∘=−1486kJ/mol

T=3032K

ΔG∘=ΔH∘−TΔS∘

Under standard conditions T=298K

∴ΔG∘=−1648.4×10³−(298×−543.7)

ΔG∘=−1486 kJ/mol

At equilibrium ΔG=0

∴0=ΔH∘−TΔS∘

assuming the enthalpy and entropy changes don't change much with temperature we can use the standard values.

∴T=ΔH∘ΔS∘

T=−1648.4×10³−543.7K

T=3032K

Therefore, standard Gibbs energy change for the following reaction is 23 kj mol-1 at 298 k what are the concentrations of ca2 and so42- at equilibrium is 3032K.

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The relative humidity of the sample containing 14 grams of water at a temperature of 20°C is 100%.

Explanation for relative humidity

Relative Humidity is defined as the ratio that is expressed in percent, of the amount of atmospheric moisture present relative to the amount that would be present if the air were saturated.

Given,

Air temperature of 20°C can sustain the amount of water vapor is 14 grams.

From the table of saturation mixing ratio, it is observed that

The saturation mixing ration for air temperature at 20°C is 14g/kg

Therefore, the relative humidity for the given sample is,

14/14 × 100 = 100%

Hence, the relative humidity for the given sample is 100%.

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Brackish water is a mixture of freshwater and seawater, below approximately 33 ppt.

Brackish water(aka brack water) is water occurring in a natural environment that has more salinity than freshwater  but not as much as seawater. It may result from mixing seawater (salt water) and freshwater together, as in estuaries, or it may occur in brackish fossil aquifers. The word comes from the Middle Dutch root brak, which means slightly salty.

What is Salinity ?                                                                                               Salinity is the measure of the number of grams of salts per kilogram of seawater, which is expressed in parts per thousand. Parts per thousand can be defined as how many parts, or grams, of salt there are per thousand parts, or kilogram (1,000 g), of seawater

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The statements which is not true is Covalent bonds form between non-metal and metal elements as ionic bond forms between non-metal and metal elements .

The bond formed by pairing of electrons between the atoms by sharing electron to each other is  known as Covalent bonds. It is generally formed between two Non-metals.

Ionic Bond is formed because of electrostatic attraction. This generally formed in the opposite charged ions of the atoms that why they generally form between Metals and Non- metals.

Hence, statements which is not true is Covalent bonds form between non-metal and metal elements as ionic bond forms between non-metal and metal elements .

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Sending a token to an account that can only accept them is known as "burning" a coin. Burner or eater addresses are wallet addresses that are used to burn bitcoin. Burning effectively takes tokens out of circulation.

A digital asset is essentially removed from circulation by being locked away for all time when it is burned by sending it to a location from which it can never be retrieved, also known as a burn address.

A token is permanently lost if it is transferred to a burn address. Anyone who owns a cryptocurrency can burn it, but since you'd essentially be throwing money away, it's not exactly something you'd want to do for no reason. The majority of the time, a cryptocurrency's creators pick how much to burn.

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The gas would have a 11.05 L volume at a constant temperature.

Individual atoms, elemental molecules derived from a single type of atom, or complex molecules derived from a number of atoms can all be found in a pure gas. A gas mixture like air contains a variety of pure gases. A gas is a form of matter that adapts the form of the container it is housed in and creates an uniform distribution inside the container, defying gravity and having no concern for the substance amount present.

Gases include substances like oxygen, carbon dioxide, nitrogen, hydrogen, helium, steam, and dry ice, to name a few. Because their particles are much more dispersed than those in solids or liquids, gases are thought to be significantly less dense.

P1 = 3.0 atm

V1 = 6 lit

P2 = 1240 mm Hg = 1.63 atm

V2 = ?

P1V1 = P2V2

3.0 X 6 = 1.63 X V2

V2 = 11.05

When a fixed mass of gas is cooled, its volume decreases, and when the temperature is raised, its volume increases.

V1 / T1 = V2 / T2 (Sometimes known as Charles's Law)

V1 = is the starting volume

T1 = is the starting temperature

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The original volume of the argon sample was 42.37L when the argon sample's pressure was raised from 3.54 atm. 3:54 to 8:38 a.m. 8.38 atm at a fixed temperature

The most prevalent gas in the atmosphere after nitrogen and oxygen is argon. Argon is a noble gas, making it fully inert, like helium. It is a colourless, odourless gas that has no effect on other substances at all. Despite being a gas, argon has the ability to combine with other substances in specific situations.

Isothermal processes are defined as those that occur at constant temperature. There are many isothermal processes that are used often. At constant temperatures, the working fluid undergoes a change in phase during the boiling and condensing processes.

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For the given ion electronic structure, the atomic number is 50, electrons present in this ion is 48, it forms cation with +2 charge. The atom is Tin and the symbol is "Sn".

What is electronic configuration?

Also called electronic structure, the arrangement of electrons in orbits around the nucleus. The electron configuration of atoms in quantum mechanical models is given by ordering the occupied orbitals in order of packing, with the number of electrons in each orbital indicated as a superscript.

What is atomic number?

The atomic number, or atomic number of a chemical element, is the number of electric charges in the nucleus. For normal atomic nuclei, this equals the number of protons, or the number of protons found in the nucleus of each atom of that element. Atomic numbers can be used to uniquely identify common chemical elements.

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The most common pH indicator used in Simmons Citrate Agar is Bromthymol Blue (BTB)

Simmons Citrate Agar is a selective and differential medium used for the detection and differentiation of Enterobacteriaceae (gram-negative bacteria).

The medium contains sodium citrate as the sole carbon source, which is used to differentiate organisms based on their ability to utilize citrate as a sole carbon source.

The medium also contains pH indicators that change color based on the pH of the medium. The most common pH indicator used in Simmons Citrate Agar is Bromthymol Blue (BTB).

BTB is a pH indicator that turns yellow in acidic conditions and blue in basic conditions. As the bacteria metabolize the citrate in the medium, they produce acids, which cause the medium to become acidic.

This change in pH is detected by the BTB, which changes color from blue to yellow. The yellow coloration of the medium is an indication that the organism is utilizing citrate as a sole carbon source.

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The concentration of NaOH  is 0.05 M

given that :

molarity of HCl solution, M1 = 0.100 M

volume of HCl solution, V1 = 12.50 mL = 0.0125 L

volume of NaOH solution, V2 = 25 mL = 0.025 L

molarity of NaOH solution, M2 = ?

using the titration formula we get :

M1 V1 = M2 V2

putting the value in the formula :

0.100 × 0.0125 = M2 × 0.025

0.00125 = M2 × 0.025

M2 = 0.05 M

Thus, the concentration of an NaOH solution if it will takes 12.50 mL of a 0.100 M HCl of the 25 mL is 0.05 M.

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(order in NO ) + (order in H2 ) = overall order = third

2 + (order in H2 ) = 3

(order in H2 ) = 3 - 2 = 1 = first order in H2 .

Rate = k[ NO ] 2 [ H2 ] 1 = k[NO]2[H2] .

What is Rate of reaction?

The rate at which reactants change into products is known as the rate of reaction or reaction rate. It goes without saying that the rate at which chemical reactions take place varies greatly. While certain chemical reactions occur almost instantly, others typically take time to achieve their final equilibrium.

Reaction rate is the rate at which a chemical reaction moves forward. It is frequently described in terms of either the concentration of a reactant that is consumed in a unit of time or the concentration of a product that is generated in a unit of time (amount per unit volume).

You may also define it in terms of how much of the reactants are used up or how much of the products are produced in a given amount of time. Consider, for illustration, a reaction where the balanced chemical equation is of the type A + 3B →   2Z.

The following alternate ways of expressing the rate are also possible:

Where t is the time, [A], [B], and [Z] are the substance concentrations, and a, b, and z are their amounts, the formula reads: d[Z]/dt, -d[A], -d[B], dz/dt, da/dt, and db/dt. Please take note that these six expressions are not interchangeable; rather, they are just connected.

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The NaOH 31.5 ml of 0.0833 M NaOH will be required to 25.0 mL of 0.105 M HCl.

Given

M1= 0.105 M HCl

V1 = 25 ml HCl

M2 = ?

V2 = 31.5 ml NaOH

From concentration calculation

M1V1 = M2V2

0.105 M x 25 ml = M2 x  31.5 ml

M2 = 0.0833 M NaOH

Titration is a technique for determining an unknown solution's concentration. Titrating refers to a solution's known concentration. The burette is filled with the titrant. Analyte or titrate refers to the solution's undetermined concentration. In Erlenmeyer, the analyte or titrate is added.

Hence, HCl is titrated with NaOH in given concentrations.

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MgCl₂ generates the most ions per mole of solute when dissolved in dilute aqueous solution because MgCl₂ dissolves completely in aqueous solution and Molarity of MgCl₂ is higher than all given ionic compounds nahso4, nacl, c2h5oh and caso4.

The equation for the dissociation of MgCl₂ in an aqueous solution is:

MgCl₂→Mg²⁺ + 2Cl⁻

Based on the equation for the reaction, for every mole of magnesium ions present in the solution, there are two moles of chloride ions. This is the case because in order to balance the charges to form the compound, the total anionic and cationic charges should be equal.

What is Molarity ?

Molarity is a concentration in terms of moles per litre of solution. Because an ionic compound dissociates into its components cations and anions in solution, the key to the problem is identifying how many moles of ions are produced during dissolution.

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Net Redox Reaction when Pt(Platinum) comes in contact with   KMnO4  is : 2MnO4- + 16H+ 5Pt → 5Pt2+ + 2Mn2+ 8H2O .

Potassium permanganate(KMnO₄) is strong oxidizing agent which is reduced and oxidizes Pt (Platinum) according to the two-half reactions:

The oxidation reaction: Pt → Pt²⁺ + 2e.

The reduction reaction: MnO₄⁻ + 8H⁺ + 5e → Mn²⁺ + 4H₂O.

To obtain the net redox reaction, we multiply the oxidation reaction by 5 and the reduction reaction by 2 to equalize the no. of electrons in the two-half reactions.

So, the net redox reaction will be:

2MnO4- + 16H+ 5Pt → 5Pt2+ + 2Mn2+ 8H2O

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.

When NH4NO3's molar mass is 80.043 g/mol, its moles are 1 g/80.043 g/mol.

= 0.0125 moles

= ΔH / moles NH4NO3

= -7.5 KJ / 0.0125 moles

= -600 KJ.mol-1

What in chemistry is a molar mass?

The mass in grams of one mole of a substance is its molar mass. The molar mass of a substance can be found by adding the molar masses of its constituent atoms, as demonstrated in this video. The computed molar mass can then be used to convert between mass and the amount of moles in the substance.

What are molar mass and a mole?

One mole of a chemical is equal to 6.022 x 1023 molecules (or formula units) (ionic compound). The mass of 1 mole of a chemical is indicated by its molar mass. It provides you with the amount of grams per mole of a substance, to put it another way.

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The mole fraction of ethanol c2h5oh in an aqueous solution that is 46 percent ethanol by mass is 0.25

Mole fraction is the mole of one of the component of the solution divided by the total moles of the solution

Calculating the mole fraction of ethanol,we get

Percentage by weight of ethyl alcohol is 46% which implies in 100 g of this solution is 46 g while the mass of the water will be 54% of 100 g = 54g.

Finding the moles of water and the ethyl alcohol {molar mass of water(H₂O) = 18 and molar mass of ethyl alcohol(C₂H₆O = 46}

Moles = mass/molar mass

moles of ethanol = 46/46 = 1

moles of water = 54/18 = 3

ntotal=1+3=4

Mole fraction of ethanol is:

  Mole of ethanol            =   1/4

   Total mole of solution

Hence, the mole fraction is 1/4 or 0.25

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It will take two decades for a radioactive isotope with a half-life of 8.45 years to decay to 81.12% of its initial mass.

Something that shows or is produced by radioactive is referred to as radioactive. Radiation, which typically manifests as electromagnetic waves or swiftly moving elementary particles like protons or neutrons, is released when anything is radioactive.

The term "radioactivity" is used to characterize the natural mechanism by which some atom spontaneously split into distinct, more stable atoms, producing both particles and energy. Because unstable isotopes frequently change into more stable isotopes, this process, also known as radioactive decay, takes place.

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When 1.2 moles of phosphorus trichloride reacts then 1.2 moles of  chlorine is needed.

pcl3+cl2 ->pcl5

1 moles of PCl3 reacts with 1 mole of Cl2 to produce 1 mole of pcl5.

now, if 1.2 moles phosphorus trichloride reacts then same amount (1.2 mole) is needed to make 1.2 mole of phosphorus pentachloride.

When determining how much of a substance there is, the concept of a mole is helpful. When dealing with particles at the atomic (or molecular) level, it is commonly known that even a single grams of a pure element includes an astoundingly high number of atoms. The mole notion is widely utilized in this context. The most common unit of measurement is the "mole," which is a count of many particles.The number 6.02214076*1023, commonly known as the Avogadro constant, is frequently denoted by the letter "NA". Among the elementary entities that can be represented in moles are atoms, molecules, monoatomic and polyatomic ions, as well as other particles (such as electrons).

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Answer:

When dry ice (solid carbon dioxide) is exposed to room temperature, it sublimates, meaning it changes directly from a solid to a gas. This process is known as sublimation and is why dry ice "disappears" when left at room temperature. The gas produced is carbon dioxide, which is odorless and colorless.

Because carbon establishes four bonds to other atoms, whereas hydrogen and fluorine only form one, the balls used to symbolize these elements have four and oxygen has two holes, respectively.

Fluorine is univalent, which means it can only create one bond with hydrogen, whereas carbon is tetravalent and can establish up to four bonds. As a result, carbon has four pegs while fluorine and hydrogen only have one. Each molecule of HF has one hydrogen atom that may form a hydrogen bond, while the fluorine atom possesses three lone pairs of electrons. The maximum amount of hydrogen atoms can form hydrogen bonds, and each HF molecule will typically form two hydrogen bonds.

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If a catalyst were added to the reaction of crystal violet with sodium hydroxide, effects could occur is the mechanism of the reaction would change , the activation energy of the reaction would change and the rate of reaction would change.

When we add catalyst to the reaction the rate of reaction would change . the catalyst decreases the activation energy of the reaction . it will speed up the rate of the reaction. the mechanism of the reaction would change.

Thus, the catalyst lowers down the activation energy of the reaction . so, the rate of the reaction would change.

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