An ideal gas at 20 degrees centigrade has a volume of 12 liters and a pressure of 15 atmospheres. Its temperature is raised to 35 degrees centigrade and compressed to a volume of 8.5 liters. Calculate the final pressure of the gas. (2 pts.)

Answer:

NH3

Explanation:

In solution, they are in equilibrium. NH4+ acts as a bronsted Lowry acid and donates an H to become NH3, and NH3 acts as a bronsted lowry base and accepts an H. In this pair, NH3 is a weak base, which gets its basic character due to the presence of lone pair of nitrogen and its ability to donate it.

The mass of, [tex]Cu_2S[/tex], compound formed is 77.9g

62 grams of copper reacted with 32grams of sulfur to form copper sulfide.

[tex]Cu + S_2 \rightarrow CuS_2[/tex]

stoichiometry of Cu to S is 2:1

We need to find the limiting reactant

Molar mass of copper = 63.5 g/mol

Molar mass of Sulfur = 32 g/mol

Number of moles of Copper =  [tex]\dfrac{mass} {molar mass } = 0.99mole[/tex]

Number of moles of Sulfur = [tex]\dfrac{mass} {molar mass} = \dfrac{32g} {32g/mol} = 1 mole[/tex]

Since copper have lesser number of moles, therefore the limiting reagent is copper so the amount of product formed depends on amount of Cu present

stoichiometry of Copper to [tex]Cu_2S[/tex] is 2:1

0.99 mol of Copper forms = [tex]\dfrac{0.99} {2}[/tex]  = 0.49 mol of [tex]Cu_2S[/tex]

Mass of [tex]Cu_2S[/tex] produced = Number of moles  [tex]\times[/tex] Molar mass                

Mass of [tex]Cu_2S[/tex] produced = 0.49 mol [tex]\times[/tex] 159 g/mol = 77.9g

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[tex]\\ \tt\leadsto pH=-log[H^+][/texM

[tex]\\ \tt\leadsto pH=-log[3.4\times 10^{-11}][/tex]

[tex]\\ \tt\leadsto pH=-log3.4-log10^{-11}[/tex]

[tex]\\ \tt\leadsto pH=-0.53+11[/tex]

[tex]\\ \tt\leadsto pH=10.47[/tex]

Basic

Considering the definition of pH, the pH of the solution is 10.47 and since it is higher than 7, it is a basic substance.

pH is the Hydrogen Potential. It is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.

Mathematically, pH is calculated as the negative base 10 logarithm of the activity of hydrogen ions:

pH= - log [H⁺]= - log [H₃O⁺]

The numerical scale that measures the pH of substances includes the numbers from 0 to 14. The pH value 7 corresponds to neutral substances. Acidic substances are those with a pH lower than 7, while basic substances have a pH higher than 7.

In this case, you know [H₃O⁺]= 3.4×10⁻¹¹ M.

Replacing in the definition of pH:

pH= -log (3.4×10⁻¹¹ M)

Solving:

pH=  10.47

Finally, the pH of the solution is 10.47 and since it is higher than 7, it is a basic substance.

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Answer:

I'm not a genius but it's an invisible force that pulld object towards eachother, Earth's gravity is what keeps you on the ground and what makes things fall, Anything with mass also has gravity, objects with more mass means they have more gravity

The pH of hydrocyanic acid before and after the addition of sodium cyanide is 0.371 and 9.121

Calculation of pH of 720:

Given: Concentration of hydrocyanic acid (HCN) = 0.425 M

To find: pH

Reaction:

[tex]HCN \,\,\,\,\,\rightarrow \,\,\,\,\,\,H^+ + CN^-[/tex]

0.425M     0.425M

[tex]pH= -[logH^+]\\pH=-[log\,0.425]\\pH= 0.371[/tex]

pH after adding 0.249 mol of sodium cyanide (NaCN)

Pka of HCN= 9.21

Concentration of sodium cyanide = [tex]\frac{0.249}{0.720}\,M[/tex]

Concentration of NaCN= 0.346 M

According to Henderson–Hasselbalch equation:

[tex]pH= p_k_a + log\frac{salt}{acid}[/tex]

Putting the values in the above equation,

[tex]pH= 9.21 + log\frac{0.346}{0.425} \\\\pH= 9.21 - 0.089\\pH= 9.121[/tex]

Note: Pka value of HCN is assumed as 9.21

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Answer:

In the dephosphorylated structure, the enzyme is stabilized via coordination of a phosphate ion by the active-site histidine residue and the two ...

The volume of chlorine required is 7.71 L.

The reaction between phosphorus and chlorine is:

2P + 5Cl₂→ 5PCl₅

Therefore, 2  moles of P requires 5 moles of chlorine to react with it.

Given mass of P =3.39 g

Molar mass of P=30.97 g/mol

No. of moles of P = given mass/ molar mass = 3.39 / 30.97 = 0.109 moles

2  moles of P requires 5 moles of chlorine

0.109  moles of P will require 0.109 x 5/2 = 0.2725 moles of chlorine

According to ideal gas equation

PV=nRT

2.04 x V = 0.2725 x 0.0821 x 703

V = 0.2725 x 0.0821 x 703 / 2.04

V = 7.71L

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The difference in the electronegativity of the Y-P bond is 0.97.

The term electronegativity has to do with the difference between the ability of two atoms in a bond to attract the shared electrons of the bond towards themselves.

The electronegativity value of Y is 1.22 while the electronegativity value of P is 2.19.

Hence;

ΔEN = 2.19 - 1.22

ΔEN = 0.97

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Answer:

a between c and o

Explanation:

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Answer:

yes

Explanation:

boiling point, freezing point, ph , density  are just a few that would change

The new volume V₂ is 5.4L

The new volume is calculated using Boyle's law formula

That  is  P₁V₁=P₂V₂

where,

p₁ =  852 torr

V₁ = 27.0

P₂ = 4260 torr

V₂=?

Make  V₂ the subject of the formula by diving into both sides of the equation by P₂

V₂ = P₁V₁/P₂

⇒ 852 *

V₂  is, therefore, = 5.4 L

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Answer:

2

Explanation:

From the calculations, the volume of the solution is 0.25 L.

The term concentration refers to the amount of solute in a solution. It is obtained as the ratio of the number of moles and the volume.

Given that;

number of moles = 0.078 moles

concentration =  0.312 M

n = CV

V = n/C

V = 0.078 moles / 0.312 M

V = 0.25 L

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Answer:

m/s

Explanation:

One 'm' and one 's' in the numerator and the denominator 'cancel out' and you are left with  m / s

Answer: 15.999 grams.

Explanation: The molar mass of an element is the mass of one mole of that element. You can also solve this with a little bit of math.

[tex]15.999gO*\frac{1molO}{15.999gO} =1molO[/tex]

I hope this helps! Pls mark brainliest!! :)

Answer:

Not so sure. Hope it helps...

The selection of the beaker for heating the solution:

The best reason for choosing the beaker for heating the solution is "The beaker will not tip over when placed on the hot plate".

What is a Beaker?:

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Answer:

Chemical bonds are how atoms, and even molecules join together.

Explanation:

There are two main types of primary chemical bonds. While secondary links relate to molecules, primary ties are atom to atom. This answer explains basic primary bonds only.

One must comprehend what a valence shell is before I proceed. The outer electron orbital of an atom is known as the valence shell. Most of the time (except from hydrogen), atoms desire to have 8 electrons in their valence shell, thus they form bonds with other atoms to accomplish this.

All bonds result in a new chemically different molecule. Now, the two types are:

The temperature inside the tank is 9.013K

Using the ideal gas equation

T=PV / nR

Given,

n = 0.821

R = 8

P = 3.70

V = 16

T = 16 * 3.70 / 0.821 * 8

T = 59.2 / 6.568

T = 9.013

The temperature inside the tank is 9.013K

Many gases such as nitrogen, oxygen, hydrogen, noble gases, some heavier gases like carbon dioxide, and mixtures such as air, can be treated as ideal gases within reasonable tolerances over a considerable parameter range around standard temperature and pressure.

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Answer:

1.02 N/mm2

Explanation:

We can see that the pressure is applied on the small weight that covers the opening.

The area of the circular opening is π(0.512 mm)

= 0.824 mm2

Pressure = Pressure = Force / Area

=  (0.847 N) / (0.824 mm2)

= 1.02 N/mm2

Answer:

1.A solvent is a liquid in which another substance is dissolved to form a solution. Examples of solvents include water, alcohol, and vinegar.

2.A solute is a substance that is dissolved in a solvent to form a solution. Examples of solutes include salt, sugar, and caffeine.

3.Several factors can influence the solubility of a solute in a solvent, including the nature of the solute and solvent, the temperature, and the pressure.

Explanation:

The new volume of the gas, given the data is 1.3 L

The new volume of the gas can be obtained by using the combined gas equation as illustrated below:

P₁V₁ / T₁ = P₂V₂ / T₂

(1 × 10) / 273 = (7 × V₂) / 250

Cross multiply

273 × 7 × V₂ = 10 × 250

Divide both sides by 273 × 7

V₂ = (10 × 250) / (273 × 7)

V₂ = 1.3 L

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Concentration of Hydronium ions in the Acetic acid is [tex]1.58\times10^{-5}[/tex]

Calculation of concentration of acid:

pH of a solution is defined by the concentration of Hydronium ions in the solution.

Also, pH is defined as the negative of logarithm of [tex]log[H^+][/tex]

[tex]pH= -log[H^+][/tex]

pH of Acetic acid= 4.8

Therefore,

[tex]4.8= -log[H^+][/tex]

Taking antilog, we get

[tex][H^+] = 0.0000158M= 1.58\times10^{-5}M[/tex]

The Hydronium concentration of the acetic acid is [tex]1.58\times 10^{-5}[/tex]M.

As Acetic acid is a weak acid which means that ionization of acid is not complete, ie. 100%

That is why the concentration of Hydronium ions are less in the solution.

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An ionic compound is composed of a cation (generally, a metal ion) and an anion (a nonmetal ion). The cation and the anion combine due to the Coulombic force of attraction to form an ionic lattice. The metal atom releases one or more electrons and the nonmetal receives these electrons until they fulfill their octet.

Ionic compounds are held together by opposite charges but do not have a charge. You have to balance the +’s and -‘s. Ba has a charge of +2 F has a charge of -1 You need 2 F- to balance the +2 of Ba BaF2.

a) BaF2 or barium fluoride

b) CsCl or cesium chloride

c) Li3N or lithium nitride

d) Al2O3 or aluminum oxide

Barium And Fluorine

Please check the attached file for a detailed answer.

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Answer:

Explanation:

Answer: D. Solid

Answer:

24.8 moles MgO

Explanation:

To find the number of moles produced, you need to multiply the mass (999 grams) by the molar mass of magnesium oxide. The molar mass is made up of the atomic weights of each element times their quantities in the molecule.

Molar Mass (MgO): 24.305 g/mol + 15.998 g/mol

Molar Mass (MgO): 40.303 g/mol

 999 g MgO              1 mole
--------------------  x  ----------------------  =  24.8 moles MgO
                                 40.303 g

The percentage of words in the book which have more than two syllabus: Can't decide. The number of pages in the first chapter is extensive property. The shipping cost of the book (which depend on weight) is extensive property.

The property which do not depend on the quantity or amount of matter is called Intensive Property. The intensive properties are pressure, temperature, density, concentration, taste, color etc.

The property which depend upon the amount of matter in a sample is  called Extensive property. The extensive properties are mass, volume, heat capacity, weight, length, shape etc.

The percentage of words in the book which have more than two syllabus in this case we cannot decide whether it is extensive property or intensive property.

The number of pages in the first chapter is extensive property because the pages have some mass and mass is extensive property.

The shipping cost of the book (which depend on weight) is extensive property as weight is an extensive property which depend upon the amount of matter.

Thus from the above conclusion we can say that The percentage of words in the book which have more than two syllabus: Can't decide. The number of pages in the first chapter is extensive property. The shipping cost of the book (which depend on weight) is extensive property.

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Answer:

The air molecules that are surrounding the metal will speed up, and the molecules in the metal will slow down.

Explanation:

As molecules heat they begin to move faster. The heat from the metal plate will make the molecules at room temperature move faster. And the room temperature makes the hot place cool, making the hot plate molecules slow down.

To visualize this, you can use this link

https://phet.colorado.edu/en/simulations/gas-properties

click the play button to activate the activity