if 12.8 g lead(ii) sulfate (303.25 g/mol) precipitates when excess potassium chloride is added to 1.65 l of a water sample, what is the molar concentration of pb2 in the sample?

The base peak in the mass spectrum of 3-methylpentane has the most plausible value at m/z=57. Hydrocarbons often undergo mass spectroscopic fragmentation at a branch.

The horizontal axis in a mass spectrum is stated in units of mass divided by charge number, or m/z. With GCMS, z is usually always 1, hence the mass is frequently determined by the m/z value.

The base peak of the spectrum is defined as the peak with the arbitrary intensity value of 100. The molecular ion, which has a peak at m/z=72, is what determines the molecule's molecular mass.

To know more about spectrum visit:-

https://brainly.com/question/6836691

#SPJ4

The atoms that are in 15.6 gms of silicon are 3.66×10^23 present in the atoms.

Silicon (Si) has an atomic quantity of 14 and used in lots of present day devices. Its packages are huge and varied, from glass home windows to feeding bottles, incorporated circuits to enamels.

Read more about silicon;

https://brainly.com/question/19249078

#SPJ4

When introduced to water, an Arrhenius acid raises overall concentration of Hydrogen ion ions in the solution. These H+ ions combine to create the hydronium ion (H3O+).

An Arrhenius base increases the concentration or hydroxide (OH-) ions while an Arrhenius acid increases the concentration if hydrogen (H+) ions in an aqueous solution. Because of this, an Arrhenius acid-base reaction is a neutralisation reaction when an acid as well as a base interact.

According to Arrhenius, bases are hydroxide compounds who dissociate to produce OH- ions in the presence of water, whereas acids are helium compounds that do the same.

To know more about  Arrhenius acid  visit:

https://brainly.com/question/9936252

#SPJ4

Statements that correctly describes the viscosity of a liquid : viscosity decreases with increasing temperature, viscosity is a resistance to flow and liquid with stronger intermolecular forces will have a higher viscosity.

Viscosity describes the internal friction of moving fluid. Fluid with large viscosity resists motion because molecular makeup gives a lot of internal friction.

Things that determine the viscosity are: fluid temperature, flow conditions and pressure. Viscosity  of fluid is a measure of resistance to deformation at a given rate.

Viscosity is determined by structural properties of the molecules and raising the temperature reduces viscosity of the solution or fluid.

To know more about viscosity, refer

https://brainly.com/question/2568610

#SPJ4

The true statement, given the data from the table is: The atomic mass would be closer to 20 than 18

To know which statement is true, we shall determine the average atomic mass of the element. Details below:

Average atomic mass = [(Mass of 1st × 1st%) / 100] + [(Mass of 2nd × 2nd%) / 100]

Average atomic mass = [(18 × 40) / 100] + [(20 × 60) / 100]

Average atomic mass = 7.2 + 12

Average atomic mass = 19.2

Thus, the average atomic mass is 19.2

Therefore, the true statement is: The atomic mass would be closer to 20 than 18

Learn more about average atomic mass:

https://brainly.com/question/24185848

#SPJ1

Complete question:

Please attached photo

Isopropanol, also called as Isopropyl alcohol , is a colorless, flammable liquid. If you've ever smelled rubbing alcohol, you'll be familiar with its aroma.

Because it is a volatile liquid, it swiftly evaporates when the container is left open. There are three carbon (C) atoms in isopropyl alcohol, which has the chemical formula C3H8O. Isopropyl alcohol has a three-carbon chain made up of its three carbon atoms. Three hydrogen atoms are connected to each of the two carbon atoms at the ends, while one hydrogen atom and a hydroxyl (OH) group are bonded to the carbon atom in the middle. The colourless liquid known as isopropyl alcohol has a pungent, musty smell. It is employed in the production of perfumes, medicines, lacquers, dyes, cleansers, antifreezes, and other chemicals as well as skin, hair, and cosmetic items. determine exposures that may be dangerous.

To learn more about isopropanol click here https://brainly.com/question/22284953

#SPJ4

The N2H2 polarity is non. it is a non - polar compound present in the globe.

A molecule or its chemical groups have an electric dipole moment with a negatively charged end and a positively charged end when they are polarity, which in chemistry is the separation of electric charge. Because the bonded atoms' electronegativity differs, polar compounds must have one or more polar bonds. If the bond dipoles cancel one other out via symmetry, molecules with polar bonds are not polar. Dipole-dipole intermolecular forces and hydrogen bonding are how polar molecules communicate with one another. Many physical characteristics, including as surface tension, solubility, and melting and boiling points, are based on polarity. The force with which an atom pulls an electron is not constant. The electronegativity of an atom refers to the strength of the "pull" it applies to its electrons. Fluorine, oxygen, and nitrogen atoms, as well as those with high electronegativities, pull on electrons more strongly than do alkali metals and alkaline earth metals and atoms with low electronegativities. This causes an unequal distribution of electrons among the atoms in a bond because electrons are attracted to the atom with the higher electronegativity.

To know more about polarity please refer: https://brainly.com/question/3184550

#SPJ4

BH3 has trigonal planer geometry with zero net dipole moment, hence it is non-polar.

Each B-H bond in BH3 is polar / forms a dipole because the B and H atoms have different electronegativities.

On the other hand, CH2O is having a similar structure but possesses dipole moment because of the presence of polar C=O group, thus the entire molecule is polar.

That is why despite the fact that both BH3 and CH2O have similar structure, but one is polar whereas other is non-polar.

The hydrogen side of the molecule will end up slightly positive. So that is why these two. That is why the first one is non polar because of the symmetry. And the second one is polar because it is a symmetrical it does not have that symmetry that we see in the first molecule.

To learn more about Dipole Moment visit:

https://brainly.com/question/14140953

#SPJ4

Order for IR Spectrum is as follows:

Peak at 1640cm- = sp2,C=O, at 2950cm- = sp3,C-H, at 3400cm- = sp3,O-H

Carbonyl frequency general occur between 1630cm- to 1850cm- and sp3 C-H stretch always occur at less then 3000cm-.

The study of the interaction of infrared radiation with materials by absorption, emission, or reflection is known as infrared spectroscopy (also known as IR spectroscopy or vibrational spectroscopy). Chemical compounds or functional groups in solid, liquid, or gaseous forms are studied and identified using this technique. It can be applied to classify novel materials or locate and authenticate known and unidentified samples. An equipment known as an infrared spectrometer (or spectrophotometer), which generates an infrared spectrum, is used to perform the infrared spectroscopy method or procedure. An IR spectrum can be shown as a graph with the absorbance (or transmittance) of infrared light on the vertical axis and the wavelength, frequency, or wavenumber on the horizontal axis. Reciprocal centimeters, denoted by the sign cm1, are the most common wavenumber units used in IR spectra.

Order for IR Spectrum is as follows:

Peak at 1640cm- = sp2,C=O, at 2950cm- = sp3,C-H, at 3400cm- = sp3,O-H

Carbonyl frequency general occur between 1630cm- to 1850cm- and sp3 C-H stretch always occur at less then 3000cm-.

To refer more about IR spectrum visit:

https://brainly.com/question/29662371

#SPJ4

The appropriate choice is: d S2 Justification: These ions are isoelectronic because they each have 18 electrons. The size of the ion increases as the positive nuclear charge of isoelectronic ions decreases.

Ca2+ or K+, which ion's radius is larger?

Because Ca2+ has a higher nuclear charge than K+, its ionic radius is lower. Moving from left to right causes a temporary rise in nuclear charge without adding any additional shell. The electrons are drawn to the nucleus more forcefully due to the higher nuclear charge.

Name the one with the biggest ionic radius 1+. K+ Na + Cs + Li?

A group's atomic and ionic radii grow from top to bottom as a result of the addition of a new shell at each level. Therefore, out of the three IA group ions that are present—Na+, Li+, and K+—Cs+ will be the largest.

To know more about atomic radius visit;

https://brainly.com/question/13963619

#SPJ4

The sample which have the largest mass is the correct option is a)   1 mole of marshmallow.

The expression for number of moles is given as follows :

number of moles = mass / molar mass

mass = moles × molar mass

molar mass of marshmallow = 210.14 g/mol

molar mass of carbon dioxide = 44 g/mol

molar mass of Pb = 207.2 g/mol

it is clear form the above equation that the sample which has the larger the molar mass has the largest mass. the order of the mass in the following sample is given as :

marshmallows > Pb > CO₂

Thus the 1 mole of the marsh mallows has the largest mass among the following sample.

To learn more about mass here

https://brainly.com/question/29751838

#SPJ4

The net energy that the proton-proton cycle yields is 24.68 MeV. The proton-proton cycle is a series of nuclear reactions that occur in the core of stars and involve the fusion of hydrogen nuclei into helium.

In the proton-proton cycle, two protons fuse to form a deuterium nucleus (a hydrogen nucleus with a proton and a neutron), a positron (a type of antimatter particle with the same mass as an electron but opposite charge), and a neutrino (a subatomic particle with very little mass and no charge). This reaction releases 0.42 MeV of energy. Next, a deuterium nucleus and a proton fuse to form a helium-3 nucleus (a helium nucleus with two protons and a neutron) and a gamma ray (a high-energy photon). This reaction releases 5.49 MeV of energy. Finally, two helium-3 nuclei fuse to form a helium-4 nucleus (a stable helium nucleus with two protons and two neutrons) and two protons. This reaction releases 12.86 MeV of energy.

To determine the net energy that the proton-proton cycle yields, it can be calculated by by adding the energies of the three reactions in the proton-proton cycle:

0.42 MeV + 5.49 MeV + 12.86 MeV = 24.68 MeV.

Learn more about the proton-proton cycle, here https://brainly.com/question/17162685

#SPJ4

21) The correct description of the compounds are options a b c.

14) The correct chemical names are b c d

11) Li forms an ionic compound with fluorine

4) The ending of name (c) would differentiate the two compounds.

The functional group on the chain is carboxyl (a)

We know that the structure of the compound would have to do with the way that the compound can be written. In this case, we have the compound that have been shown and then we have some statements about the molecules.

We must note that the structures show us how the atoms that are in the compounds can be arranged and then we can be able to deduce the structure of the molecule that has been shown.

The compound on the right hand side is a cyclic compound while the compound on the left hand side is a long chain compound. We can now be able to count up the number of the hydrogen and the carbon atoms that are present in each of the compounds.

Learn more about compounds:https://brainly.com/question/13516179

#SPJ1

We might want to heat a reaction :To increase the rate of the reaction, to evaporate the solvent more quickly ,to increase the solubility of the reagents and  to overcome the activation energy for the reaction.

The average reaction rate of the reactant molecules increases as the temperature rises. The number of molecules that are able to react quickly rises as more molecules move more quickly, hastening the creation of products.

For chemical processes to be scaled up safely and effectively, the heat of reaction, also known as reaction enthalpy, is a crucial element. The energy that is either released or absorbed when chemicals are changed in a chemical reaction is known as the heat of reaction. It explains how the energy content changes when reactants become products. The majority of reactions carried out in the chemical and pharmaceutical industries are exothermic, although a reaction can also be endothermic (heat absorption). One of the thermodynamic parameters utilized in chemical development, scale-up, and safety to scale processes from the lab scale to manufacturing is the heat of reaction, among others. The heat of reaction, also known as reaction enthalpy, is commonly given as either specific or molar enthalpy in KJ/Kg or KJ/L.

To learn more about chemical reaction click here:

https://brainly.com/question/11231920

#SPJ4

Since the proton is bonded to the carbon atom that is bonded to the highest number of other carbon atoms, the enol tautomer is an "e" isomer:

e-Acetone: H3C-C=O-CH3

|

H-O

To draw the "z" isomer, simply bond the proton to the carbon atom that is bonded to the lowest number of other carbon atoms:

z-Acetone: H3C-C=O-CH3

H

|

O-H

Enyol tautomers are structures of a compound that can interconvert through the movement of a proton. The two most common types of enol tautomers are the "e" and "z" isomers.

Learn more about enyol tautomers, here https://brainly.com/question/16857794

#SPJ4

Only C-C and C-H bond vibrations can be seen in their IR spectrum.

Acetophenone has an odour and appearance similar to that of oranges and is a white liquid with a sweet, pungent flavour. freezes in cold temperatures. water-soluble to a little extent and denser than water. as a result, sinks in water. more dense than air vapour. mildly irritating to the eyes and skin. High quantities of vapours can be addictive. a flavouring, solvent, and catalyst for polymerization.

Acetone has had one of its methyl groups replaced by a phenyl group to become acetophenone, a methyl ketone. It functions as an animal metabolite, a xenobiotic, and a photosensitizing agent.

Acetophenone is a chemical that is used as a flavouring agent in food, a fragrance in soaps and perfumes, and a solvent for polymers and resins.

To learn more about the Acetophenone Please visit the below link.

https://brainly.com/question/29585681

#SPJ4

CH3CO2H is called acetic acid the name implies that C. Acetic acid can react with acids, but does not react with bases. Acetic acid, also known as ethanoic acid, is a weak acid.

The name "acetic acid" implies that the compound can react with acids, but not with bases. This is because the suffix "acid" indicates that the compound is capable of donating a hydrogen ion (H+) to a base. This means that when acetic acid reacts with another acid, it will donate a hydrogen ion, resulting in the formation of CH3CO2- (the acetate ion). However, when acetic acid reacts with a base, it will not be able to donate a hydrogen ion, so it will not react.

Learn more about acetic acid, here https://brainly.com/question/15202177

#SPJ4

The answer is 7200 milliliters, but since moles are a significant quantity, you'd need a very, very large volume of solution, making this impractical for the sake of many experiments. We will translate the molarity provided into normalcy. It is evident from the description above that 5 ml of 1M [H2S O 4] is needed to neutralize 10 ml of 1N NaOH.

For "NaOH, M=N," The formula is "N (1)V (1)=100 ml xx 1N=100" ml (N) N (2)V (2)=10mlxx10 N=100' ml (N) for "H (2)SO (4)" Thus, "N (1)V (1)=N (2)V (2)" is true. You may clear your doubts and achieve good exam results with the help of step-by-step solutions provided by specialists. NaOH has a 1M molecular weight. The amount of a substance in a specific volume of solution is known as its molarity (M). The number of moles of a solute per litre of a solution is known as molarity. The molar concentration of a solution is another name for molarity. We divide the number of moles of solute by the total volume of litres of solution to determine the molarity of a solution. The moles of solute per litre of solution is measured as molarity. For instance, when table salt is dissolved in water, water serves as both the solution and the solute. Sodium chloride weights 58.44 grams per mole. One molar solution, or 1M, is created by dissolving 58.44 grams of sodium chloride in one litre of water.

Learn more about molarity here

https://brainly.com/question/26873446

#SPJ4

ch3ch2ohch3ch2oh has high melting point.

What is Melting point?

The liquefying point of a substance is the temperature at which a strong and fluid stage might coincide in balance and the temperature at which matter changes from strong to fluid structure. The term applies to unadulterated fluids and arrangements. Dissolving point relies upon pressure, so it ought to be determined. Commonly, tables of softening focuses are for standard tension, like 100 kPa or 1 climate. Softening point may likewise be known as the liquefaction point.

Liquefying point is the temperature at which a given strong material changes from a strong state to a fluid, or melts. As the system or pace of synthetic corruption of a medication is probably going to be different in strong and fluid state.

Now that we recognize some thing about degree outlines, it will appear good enough why researchers represent softening factor the way in which they do. In the first region, in normal phrases, the softening The liquefying factor is equal to the threshold of freezing over! At the give up of the day, it goes from a strong to a fluid on the very temperature that it is going from a fluid to a sturdy.

Learn more about Melting Point from given link

https://brainly.com/question/40140

#SPJ4

For each atom in a Lewis structure, you should count how many electrons it "owns" in order to get the formal charges. All of its lone pair electrons as well as 50% of its bonding electrons should be counted. The formal charge is the discrepancy between the atom's number of valence electrons and the number it possesses.

The formula FC = VE - [LPE - 12(BE)], where VE is the number of valence electrons on the free atom, LPE is the number of lone pair electrons on the atom in the molecule, and BE is the number of bonding (shared) electrons around the atom in the molecule, can be used to determine an atom's formal charge.

The VSEPR hypothesis, which describes the valence shell electron-pair repulsion, allows us to forecast the molecular structure, including the approximate bond angles around a central atom, can be determined by counting the bonds and lone electron pairs in the molecule's Lewis structure.

To know more about valence electrons visit:-

https://brainly.com/question/28977387

#SPJ4

Ln P=-delta Hvap/R(1/T)+C and LnP2/p1=deltaHvap/R(/T2-/T1). A Clausius-Clapeyron equation, which connects vapor pressure to temperature, is accurately expressed by relationships.

additionally known as the Clapeyron solution or Clapeyron-Clausius equations. the differential equation linking a substance's temperature and pressure in a system where the substance is in equilibrium between two phases. where T is the temperatures in °C and K is the vapor pressure.

The left (LHS) natural log term has no units. The only criterion is that P1 and P2 must be expressed in same pressure unit, regardless of the pressure units you employ. The unit for the temperatures term will be K1. The R is measured in J mol K1, where K1 is the temperature.

To know more about Clausius-Clapeyron equation visit:

https://brainly.com/question/13162576

#SPJ4

The heat of the reaction, in kJ, when 4.18 g of the hydrocarbon are combusted 775.70 kJ.

The heat energy is given as :

q = m c ΔT + Ccal ΔT

q = ( 974 g× 4.184 ×6.9) + 624 ×6.9

q = 32424.59 J

moles of hydrocarbon = 0.0418 mol

heat of combustion = 32424.59 J / 0.0418 mol

                                 = 775707.89 J

                                = 775.70 kJ

Thus, A 4.18 g sample of a hydrocarbon is combusted in a bomb calorimeter that contains 974 g of water. the temperature of the water increases by 6.9 °C when the hydrocarbon is combusted. the calorimeter constant for the calorimeter was determined to be 624 J/°C. what is the heat of the reaction is 775.70 kJ.

To learn more about calorimeter here

https://brainly.com/question/28943378

#SPJ4

The pH change when 0.106 mol KOH is added to 1.00 l of the buffer is 0.238

given that :

molarity of C₆H₅NH₃Br = 0.432 M

molarity of C₆H₅NH₂ = 0.373 M

pOH = pkb + log [acid] / [base]

pOH = 9.366 + log (0.432) / (0.373)

pOH =  9.366 + 0.0718

pOH = 9.437

pH = 14 - 9.437

pH = 4.563

after 0.106 mol of KOH is added to 1 L

[C₆H₅NH₃Br] = 0.432 - 0.106 = 0.326

[C₆H₅NH₂ ] = 0.373 + 0.106 = 0.479

pOH = pkb + log [salt] / [acid]

pOH = 9.366 + log (0.326) / 0.479)

pOH = 9.366 - 0.167

pOH = 9.199

pH = 14 - 0.199

pH = 4.801

the pH change is = 4.801 - 4.563

                           = 0.238

To learn more about pH change here

https://brainly.com/question/18649411

#SPJ4

Al2(SO4)3 will have the greatest value of van 't Hoff factor, its solution would have the lowest freezing point. The correct option is A

Freezing point can be defined as the process when a liquid turns into a solid. Freezing point can also be occurs when heat is lost from an object which causes the molecules to slow down and form tighter bonds. One example of freezing point is when water turns into ice.

Therefore a freezing point may occurs when the molecules of a liquid slow down enough that their attractions cause them to arrange themselves into fixed positions as a solid.

Learn more about freezing point here: brainly.com/question/24314907

#SPJ1

3.66 1023 atoms are present. In 15.6 grams of silicon, there are 3.66 10 23 atoms.

Similar to this, one mole of silicon still comprises 6.022 1023 silicon atoms for one gram of silicon with an atomic weight of 28 grams. As a result, 1 mole of silicon will weigh 28.0855 g and contain 6.022 x 1023 atoms. Therefore, 3.5 grams of silicon contain 7. 505 x 1022 atoms. 3.66 1023 atoms are present. In 15.6 grams of silicon, there are 3.66 10 23 atoms.

The equation is not too complicated. The formula for how many atoms there are in a volume of ANY material is: # of atoms = N * (density) * volume / The value of N, often known as Avogadro's number, is 6.022*1023 atoms/mole.

To learn more about silicon please click on below link

https://brainly.com/question/28213172

#SPJ4

The percent abundance of the Rb- 85 isotope is 79 % while the percentage abundance of Rb-87 is 21%.

We know that an atom has to be composed of isotopes. The isotopes of the elements are the atoms that do not have the same mass number but they do have the same atomic number. The reason why they do not have the same mass number is because they do not have the same number of neutrons present in the atom of the element.

Having said that, we now have to turn our attention to the atom of rubidium which is the atom that is under consideration here in this question. We have to write the relative abundance of Rb- 85 as x and that of Rb-87 as 1-x.

We now have;

85.427 = 85x + 87(1 - x)

85.427 = 85x + 87 - 87x

85.427  - 87 = 85x - 87x

-1.573 = -2x

x = 0.79 or 79%

Learn more about percentage abundance:https://brainly.com/question/11587351

#SPJ1

Answer: D

Explanation:

A mole of diatomic oxygen has a total translational kinetic energy of 4000J at 50 °C.

The diatomic molecule known as molecular oxygen is made up of two oxygen atoms that are covalently connected to one another (O2). Molecular oxygen is essential for life because it is required for breathing by such a wide variety of species. Combustion of fossil fuels also requires it. We refer to the elements as diatomic because the atoms are found in pairs. H2, N2, O2, F2, Cl2, Br, and I2 are the chemical formulas for these substances. The periodic chart makes it simple to locate the diatomic elements. Along with O and N, they contain the halogens (F, Cl, Br, and I).

A molecule made up of two of the same atom is referred to as a diatomic element. Diatomic is a compound word made up of the letters "di" for two & "atomic" for atom. With only one atom, a monatomic element can remain stable. Because they can adhere to the octet rule in this paired form, these diatomic elements are the most stable in it.

The advantages are:

• eliminating viruses (ozone and hydrogen peroxide)

• enhancing the bloodstream's ability to carry oxygen to the body's tissues.

• quickening petrochemicals' decomposition.

If the speed of a diatomic hydrogen molecule is 200m/s

Therefore:

50∘C=200m/s

Then the total translational kinetic energy:

1.0mol=50∘C

So the calculation is:

Transactional kinetic energy =2000/50

=40

1.0mol=100J

=40*100

=4000J

There the total kinetic energy is 4000J

To know more about Diatomic Oxygen visit:

https://brainly.com/question/12086817

#SPJ4

The rms (root-mean-square) speed of a diatomic hydrogen molecule at 50∘C is 2000 m/s. Note that 1.0 mol of diatomic hydrogen at 50∘C has a total translational kinetic energy of 4000 J. The total translational kinetic energy of 1.0 mole of diatomic oxygen at 50∘C is:

If you take note that when conjugation DOES NOT occur, you get a more stable carbocation, protonating carbon-1 produces the main result.

Since only a 1,2-hydride shift is needed to reach the main product, protonating carbon-1 would have been preferable to protonating carbon-2 (molecules tend to be lazy and do the least work possible).

A primary carbocation or a secondary carbocation upon a 1,2-hydride shift would result from protonating carbon-3. The tertiary carbocation produced by protonating carbon-1 is more stable than both of them combined.

Even though there is a chance of conjugation, protonating carbon-4 is still not a good idea because it results in either primary or secondary carbocations, neither of which are excellent choices.

Learn more about carbocation here;

https://brainly.com/question/13998560

#SPJ4