State law of conservation of mass and prove the law for below given chemical reaction

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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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 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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Considering the definition of mole fraction, the mole fraction of each component in the solution is:

The molar fraction is a way of measuring the concentration that expresses the proportion in which a substance is found with respect to the total moles of the solution.

In this case, in first place you should know that the molar mass of each component is:

Now, the number of moles of each compound can be calculated as:

So, the total moles of the solution can be calculated as:

Total moles = 1.3125 moles + 0.2884 moles + 0.8333 moles

Total moles = 2.4342 moles

Finally, the more fraction of each component can be calculated as follow:

In summary, the mole fraction of each component in the solution is:

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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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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:

a between c and o

Explanation:

♡´･ᴗ･`♡

Answer:

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

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

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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Answer:

Not so sure. Hope it helps...

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:

yes

Explanation:

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

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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Answer:

Explanation:

Answer: D. Solid

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:

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 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: 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:

2

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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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

We need to add 2.09 mL of concentrated acid to obtain 75 mL of 0.335 M HBr solution.

You are performing a dilution of HBr going from a concentration of 12M to 0.335M, and you want to end up with a final volume of 75 ml of the dilute solution.

Consider the dilution formula: M1V1 = M2V2.

The basis behind this formula is that the number of moles of the acid before and after the dilution must remain constant.

M1 = the molarity of the stock solution,

M2 = the molarity of the diluted solution,

V2 = the final volume of the diluted solution.

In this case, we need to determine V1, which is the volume of the stock solution used to prepare the diluted sample. With this knowledge, we can plug our numbers into the equation and we obtain the following:

(12 mol/L)*V1 = (0.335mol/L)*(0.075L).

Keeping in mind that molarity is the moles of a substance in one liter of solution, we will use mol/L instead of M. By doing this, we are reminded that in order to use this equation, we must convert 75 mL into units of liters.

After rearranging the equation and solving for V1, we find that V1 = 0.00209L.

Finally, we must convert back from liters to mL by multiplying the final answer by 1000.

This way we end up with V1 = 2.09 mL.

This means that we need to add 2.09 mL of concentrated acid to obtain 75 mL of 0.335 M HBr solution.

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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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[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:

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:

m/s

Explanation:

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

Answer:

d. Transition metal

Explanation:

Copper is in transition metal block in periodic table.

Answer:

Copper belongs to the d. transition metal group.

Explanation:

Copper's d-shell is partially filled making it a transition metal. Copper is one of the few transition metals that has a set charge. Copper's charge is +2.

When referring to the periodic table, copper is in the middle section of the table which is the transition metals. It is between the metals and the non-metals.