What mass of oxygen reacts during the incomplete combustion of 18.0 g of propane?

The soft ionization technique that uses a UV-absorbing compound upon which the analyte of interest is placed and eventually vaporized into a plume of ions directed into the mass analyzer is matrix-assisted laser desorption ionization.

Soft Ionizer produces less fragment ions. Soft ionizer produce the molecular ions or a quasi molecular ion. This technique not fragment the macromolecules into the more smaller charged particles.

Thus from the above conclusion we can say that The soft ionization technique that uses a UV-absorbing compound upon which the analyte of interest is placed and eventually vaporized into a plume of ions directed into the mass analyzer is matrix-assisted laser desorption ionization.

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Radiopaque refers to a White or light appearance of a structure on a processed radiograph. Radiolucent refers to a Dark appearance of a structure on a processed radiograph.

Materials that prevent electromagnetic radiation from passing through are referred to as radiodense or radiopaque, whereas materials that permit radiation to pass more readily are referred to as radiolucent. In contrast to radiolucent volumes, which appear significantly darker on radiographs, radiopaque volumes of material seem white.

It is the relative inability of radio waves and X-rays to flow through a certain substance. Radiodensity (or radiopacity) is opacity to the radio wave and X-ray portion of the electromagnetic spectrum.

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The "molecule a" referred to ATP in the equation.

So, option A is correct one.

The equation is given as,

[tex]C_{6} H_{12} O_{6}+ 6O_{2}[/tex] → [tex]6CO_{2}+ 6H_{2}O + ATP[/tex]

The above equation indicates the respiration activities in the plants.

The aerobic respiration takes place in the Mitochondria and which requires oxygen and glucose and produces carbon dioxide , water and energy.

The energy is in the form of  ATP. The pull form of ATP is adenosine triphosphate. The ATP is also called energy carrier because it found in the cells of the all living organism and this molecule carries energy.

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For the mentioned reaction, the balanced chemical equation is:

KBr (aq) + AgNO3 (s) → KNO3 (aq) + AgBr(s)

The number written in front of the ion, atoms, and molecules in a chemical reaction so that each of the elements on both the sides of reactants and products of the equation gets balanced is known as the stoichiometric coefficient.

From the mentioned balanced equation, the stoichiometric coefficient before KBr is 1, AgNO3 is 1, KNO3 is 1, as well as before AgBr is also 1. Thus, it is clear that 1 mole of potassium bromide reacts with 1 mole of silver nitrate to produce 1 mole of potassium nitrate and 1 mole of silver bromide.

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One way in which God showed precision in his creation was his mighty love on the he has on his creation

The book of John made us to know that: For God do love the world that he gave his only begotten son that whosoever believeth in him shall not perish but have everlasting life.

Creations is the art of producing or making something out of something

So therefore, one way in which God showed precision in his creation was his mighty love on the he has on his creation

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The percent yield of the calcium hydroxide is 84.5%.

Stoichiometry enables us to obtain the mass of a substance form the equation of the reaction.

The equation of the reaction is;

CaCO3 + 2HCl -----> CaCl2 + CO2 + H2O

Number of moles of X = 40.0 grams/100 g/mol = 0.4 moles

Number of moles of HCl = 850/1000 * 1 M = 0.85 moles

If 1 mole of CaCO3 reacts with 2 moles of HCl

0.4 moles of  CaCO3 reacts with  0.4 moles  * 2 moles/1 mole

= 0.8 moles of HCl

Hence X is the limiting reactant.

The reaction is 1:1 then the amount of CO2  produced is 0.4 moles

Mass of CO2 = 0.4 CO2 * 44 g/mol = 17.6 g

2) The reaction equation is; 2NaOH + CaCO3 --->  Ca(OH)2 + Na2CO3

Number of moles of X = 25.0 grams/100 g/mol =  0.25 moles

Number of moles of NaOH= 40/1000 L * 2 M = 0.08 moles

If 1 mole of X reacts with 2 moles of NaOH

0.25 moles  reacts with   0.25 moles   * 2 moles /1 mole

= 0.5 moles

NaOH is the limiting reactant

2 moles of NaOH produces 1 mole of CO2

0.08 moles of NaOH produces 0.08 moles * 1 mole/2 moles

= 0.04 moles of CO2

Theoretical yield of CO2 =  0.04 moles of CO2 * 74 g/mol = 2.96  g

Percent yield = 2.5 g/ 2.96  g * 100

= 84.5%

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The example that shows the correct way to set up the calculation will be the second example.

Mathematically:

  Number of moles = mass/molar mass

In this case, mass = 23.4 g and molar mass = 110.98 g/mol

Number of moles = 23.4/110.98 = 0.21 moles

Thus, the second example is the correct way.

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Answer:

Medicinal Chemistry

Explanation:

Medicinal Chemistry deals with the development, design and production of medicines.

Hope it helps!

Have a nice day:)

Answer:

write the following as fractions in their simplest form

According to the available literature, standard nanoparticle (NP) production processes make it especially challenging to reach the catalytically important and highly complicated intermetallic -brass crystal structure.

We present a straightforward and logical method for obtaining this phase in M-Zn (M = Pd, Cu, Ni) systems as silica-supported single-phase nanocrystals. This hybrid technique begins with the synthesis of supported M/SiO2 using typical methods (dry impregnation and strong electrostatic adsorption), followed by several hours of heating to high temperatures in the presence of a stoichiometric quantity of metallic Zn in an evacuated closed system.

Pd-Zn is by far the most common in catalytic applications and produces the smallest particle size (8 nm). We investigated the effect of various synthesis parameters on phase purity and particle size distribution in the case of synthesized -brass Pd-Zn/SiO2 supported catalysts and provided general guidelines for synthesis optimization.

Pd/SiO2 is transformed to -brass Pd-Zn/SiO2, resulting in a precipitous drop in CO adsorption and a 25 kJ/mol increase in the ethylene hydrogenation barrier, indicating that the catalytic active sites are significantly modified as a result of alloying. We anticipate that these catalysts will find use in a variety of Pd-catalyzed chemistries.

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The standard temperature and pressure conditions enthalpy is usually measured under are 1kPa and 273K (option A).

Enthalpy in thermodynamics is a measure of the heat content of a chemical or physical system.

Enthalpy is the sum of the internal energy and pressure times volume It can be calculated using the following formula:

H = E + P V

Where;

H = Enthalpy

E = internal energy

P = pressure

V = volume

However, the enthalpy of a substance is usually measured under standard temperature and pressure.

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Answer:

See attached image.

Explanation:

See attached image.

Remember to use the units in deciding steps to take.  Find the moles needed or delivered by using:

Molarity x Volume = moles  [(moles/L)*(L) = moles]

Molarity, M, is dedined as 1 mole/liter.  When working with a unit such as 6M, rewite it as 6 moles/liter, and then use unit conversions to guide how to find the solution, so to speak.

Answer: The density of Uranium Hexafluoride at 60 °C and 745 torr is 0.0127 g/ml

Explanation:

Uranium Hexafluoride is only present as gas at 60 °C and 745 torr.

So, we know PV = nRT, from that

n/V = P/ RT = (745 torr)/(62.36 L-torr/mol*K)(337 K) = 0.0354 mol/L.

Density = (352.02 g/mol)(0.0354 mol/L)/(1000 cm³/L) = 0.0127 g/cm³

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Answer:

positive

Explanation:

When placed in water, acids, bases, and salts dissociate (separate) into electrolytes (ions). Salts dissociate into a cation (that is not H+) and an anion (that is not OH-), whereas acids and bases dissociate into H+ and an anion. An acid separates into anions and hydrogen ions (H+). Strong acids produce a high concentration of H+ by dissociating every single one of their molecules . Water-based solutions,

Acid:

When a material or chemical is in solution, it releases hydrogen ions (H+), which are known as acids. All hydrogen ions (H+) and chloride ions (Cl-), which are normally bound together by ionic bonding, dissociate (separate) in water when exposed to a strong acid like hydrochloric acid (HCl). Only some ions disintegrate into hydrogen ions (H+) and bicarbonate ions (HCO3-) in a weak acid like carbonic acid (H2CO3), while others are still bound together by ionic bonds.

Define base?

A base is a chemical that, when in solution, emits hydroxyl ions -{OH). We can also define a base as a substance that releases hydroxyl ions (OH-), which mix with any hydrogen ions (H+) in the solution to generate water molecules (OH- + H+ = H2O).

Therefore, a substance that receives or accepts hydrogen ions (H+) that are already present in the solution qualifies as a base.

Because it totally dissociates into sodium ions (Na+) and hydroxyl ions (OH-) when placed in water, sodium hydroxide (NaOH), which is a strong base, is now liberated and dissolves in water.

c

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The value of ΔG° at this temperature is -18034.18 J/mol

Calculation,

Given information

formation constant (Kf)= 1.7 × [tex]10^{7}[/tex]

Universal gas constant (R) = 8.314 J/K• mol

Temperature = 25° C = 25 °C + 273 = 300 K

Formula used:

ΔG° = -RT㏑Kf

By putting the valur of R,T, Kf we get the value of ΔG°

ΔG° = - 8.314 J/K• mol×300K㏑ 1.7 × [tex]10^{7}[/tex]

ΔG° = -2494.2㏑ 1.7 × [tex]10^{7}[/tex] = -18034.18 J/mol

So, change in standard Gibbs's free energy is -18034.18 J/mol

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Answer:

C - can be solids, liquids, or gases

Explanation:

Nylon, a polyamide, is produced from hexanedi-amine and a substance, x. This substance, x, is most probably a carboxylic acid.

A polymer containing repeating units connected by amide bonds being called a polyamide. Both naturally occurring and synthetic polyamides are found. Proteins found in materials like wool and silk were examples of naturally produced polyamides.

The term "nylon" refers to a family of polymeric materials made up of polyamides. Nylon would be a silk-like thermoplastic that may be formed into threads, films, or other shapes. It is often manufactured from petroleum.

Therefore, Nylon, a polyamide, is produced from hexanedi-amine and a substance, x. This substance, x, is most probably a carboxylic acid.

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Answer:

pH = 13.41

Explanation:

You can calculate the pH using the following formula:

pH + pOH = 14

You can plug the given pOH into the equation and simplify to find the pH.

pH + pOH = 14

pH + 0.59 = 14

pH = 13.41

Answer:

B. the amount of atoms you contain

Answer:

.577 atm

Explanation:

P1 V1  = P2 V2

RE-ARRANGE TO     P2 = P1 V1 / V2

Sub in the given values

  P2 = 1.15 * .414 / .825 = .577 atm

Answer: No of molecule of sucrose = 1.806 X 10^24

Explanation:

No. of molecules = No. of moles X NA

No. of molecule of sucrose = 3 moles X 6.02 X 10^23

No of molecule of sucrose =18.06 X 10^23

No of molecule of sucrose =1.806 X 10^24

Answer:

1.80 × 10²⁴ Molecules of Sucrose

They must also possess a fixed crystalline structure (spatial arrangement of atoms and ions).

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Answer:

C) ZnCl2(s) + H2(g)

Explanation:

On reaction between Zn and HCl, Zn is more reactive than Hydrogen thus displacing it from HCl making a bond with two atoms of chlorine and releases hydrogen gas.

The equation of reaction

Zn(s) + HCl(aq) => ZnCl2(s) + H2(g).

Therefore, the required products are ZnCl2(aq) and H2(g).

Taking into account the Avogadro's Law, 0.600 moles occupies 1.200 L.

Avogadro's Law is a gas law that relates the volume and amount of gas at constant pressure and temperature.

Avogadro's law states that volume is directly proportional to the amount of gas: increasing the amount of gas will increase the volume, while decreasing the amount of gas will decrease the volume.

Mathematically, this law states that the ratio between the volume and the amount of gas is constant:

[tex]\frac{V}{n} =k[/tex]

Assuming that there is a certain amount of gas n1 that occupies a volume V1 at the beginning of the experiment, by varying the amount of gas to a new value n2, then the volume will change to V2, and the following is true:

[tex]\frac{V1}{n1} =\frac{V2}{n2}[/tex]

In this case, you know:

Replacing in Avogadro's Law:

[tex]\frac{0.800 L}{0.400 moles} =\frac{1.200 L}{n2}[/tex]

Solving:

[tex]n2x\frac{0.800 L}{0.400 moles} =1.200 L[/tex]

[tex]n2=\frac{1.200 L}{\frac{0.800 L}{0.400 moles} }[/tex]

n2= 0.600 moles

Finally, 0.600 moles occupies 1.200 L.

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It is possible for two other resonance structures to be connected but results in positive formal charge which isn't suited for a very electronegative atom such as chlorine.

This is a type of diagram which depicts the bonding between atoms and lone pairs which are present in the molecule.

Adding two other resonance structures will also result in the poor overlap between the p-orbitals.

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The 0.25 volume in liters of 1.0 M [tex]K_{2}CO_{3}[/tex] solution is required to provide 0.5 moles of [tex]K[/tex](aq).

Calculation,

The Potassium carbonate dissolves as follows:

[tex]K_{2}CO_{3}(s)[/tex] → [tex]2K(aq) +[/tex][tex]CO_{3}^{-2} (aq)[/tex]

The mole ratio is 1: 2

It means, the 1 mole [tex]K_{2}CO_{3}[/tex] required to form 2 mole of [tex]K[/tex](aq).

To provide 0.5 mole of [tex]K[/tex](aq) = 1 mole ×0.5 mole /2 mole required by [tex]K_{2}CO_{3}[/tex].

To provide 0.5 mole of [tex]K[/tex](aq) ,0.25 mole required by [tex]K_{2}CO_{3}[/tex].

The morality of  [tex]K_{2}CO_{3}[/tex] = 1 M = number of moles / volume in lit

The morality of  [tex]K_{2}CO_{3}[/tex] =   1 M = 0.25 mole/ volume in lit

Volume in lit = 0.25 mole / 1 M = 0.25 mole/mole/lit = 0.25 lit

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The vapor pressure of pure B is 1.77atm

Given:-

Vapor pressure of Pure A = 0.700atm

Mole of A = 0.650mole

Mole of B = 0.250mole

Dalton's law of partial pressures states that the total pressure exerted by a gas mixture is equal to the sum of the partial pressures of all of the constituent gases.

So, Ptotal =  [tex]P_A + P_B[/tex]

According to Raoult's law, a solvent's partial vapor pressure in a solution (or mixture) is equal to or the same as the pure solvent's vapor pressure times the mole fraction present in the solution.

So, Ptotal =  [tex]X_AP_A + X_BP_B[/tex]

Ptotal = 1atm

1atm = (0.650/0.650+0.250 X 0.700atm) + 0.250/0.650+0.250 X [tex]P_B[/tex]

1atm = 0.722 X 0.700atm + 0.278 X [tex]P_B[/tex]

1atm = 0.506atm + 0.278 X [tex]P_B[/tex]

1atm - 0.506atm =  0.278 X [tex]P_B[/tex]

0.494atm = 0.278 X [tex]P_B[/tex]

[tex]P_B[/tex] =  0.494atm / 0.278

[tex]P_B[/tex] = 1.77atm

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Water cycle simply refers to the continuous movement or flow of water from the atmosphere to the earth and back to the atmosphere

These are the basic stages through which water passes. These stages are:

So therefore, water cycle simply refers to the continuous movement or flow of water from the atmosphere to the earth and back to the atmosphere

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