Assuming an efficiency of 30.40%, calculate the actual yield of magnesium nitrate formed from 130.8 g of magnesium and excess copper(II) nitrate.

Given :

Formula applied :

[tex]\boxed {Q = mc \triangle T}[/tex]

Let's solve for c !

⇒ 237,000 = 20 × c × 15

⇒ c = 237,000 ÷ 300

⇒ [tex]\boxed {c = 790 J kg^{-1} K^{-1}}[/tex]

∴ The specific heat capacity of granite is 790 J kg⁻¹ K⁻¹.

Answer:

9.17 atm

Explanation:

To find the new pressure of the gas, you need to use the following manipulated formula:

P₁V₁ / T₁ = P₂V₂ / T₂

In this formula,

P₁ = initial pressure (atm)              P₂ = new pressure (atm)

V₁ = initial volume (L)                    V₂ = new volume (L)

T₁ = initial temperature (K)            T₂ = new temperature (K)

Because you have been given values for all of the variables except for the new pressure, you can substitute them into the equation and simplify.

P₁ = 4.0 atm                                  P₂ = ? atm

V₁ = 5.5 L                                      V₂ = 2.0 L

T₁ = 300 K                                     T₂ = 250 K

P₁V₁ / T₁ = P₂V₂ / T₂                                                     <----- Given formula

(4.0 atm)(5.5 L) / (300 K) = P₂(2.0 L) / (250 K)           <----- Insert variables

0.073333 = P₂(2.0 L) / (250 K)                                   <----- Simplify left side

18.33333 = P₂(2.0 L)                                     <----- Multiply both sides by 250

9.17 = P₂                                                        <----- Divide both sides by 2.0

Answer:

=> 13.2 atm

Explanation:

From the question, we have question we have been provided with pressure, volume and temperature. Based on these variables, we are supposed to use the combined gas law formula (P1V1T1 = P2V2T2)

                   At location 1;

P1 = 4.0 atm

V1 =  5.5 L

T1 = 300 K.

                       At location 2;

P2 = ?

V2 = 2.0 L

T2 = 250 K.

We are required to determine the pressure (P2).

To begin, we make pressure (P2) the subject of in the formula:

      P2 = (P1V1T1)/(V2T2)  ................ eq. (i)

Then substitute the known values into the eq. (i).

  P2 = (4.0 x 5.5 x 300)/(2.0 x 250) atm

       = 13.2 atm.

Therefore, the pressure (P2) at location 2 is 13.2 atm.

The mass of [tex]Na_2CrO_4[/tex] required will be 0.6075 g.

Calculation of mass:

The reaction:

[tex]Na_2CrO_4 + 2AgNO_3 \rightarrow Ag_2CrO_4 + 2NaNO_3[/tex]

Volume of [tex]AgNO_3[/tex] = 75 mL

Concentration of [tex]AgNO_3[/tex] = 0.100 M

Step 1:

Molarity is moles of solute in 1000 mL of the solution.

[tex]M=\frac{n}{V}\times 1000\\\\ n=\frac{M\times V}{1000} \\\\n=\frac{0.100\times 75}{1000}\\\\n= 0.0075[/tex]

Moles of [tex]AgNO_3[/tex] = 0.0075

Step 2:

From the above equation,

2 moles of [tex]AgNO_3[/tex] is precipitated by 1 mole of [tex]Na_2CrO_4[/tex]

So, 0.0075 moles will be precipitated by-

[tex]\frac{1}{2}\times 0.0075[/tex] moles of [tex]Na_2CrO_4[/tex]

= 0.00375 moles of [tex]Na_2CrO_4[/tex]

Step 3:

[tex]mole=\frac{Given \,weight}{Molar\, mass} \\[/tex]

Molar mass of [tex]Na_2CrO_4[/tex] = 162 g/mol

[tex]0.00375=\frac{x}{162} \\x= 0.00375\times 162\\x= 0.6075 g[/tex]

So, Mass of [tex]Na_2CrO_4[/tex] required will be 0.6075 g.

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M=n/V

M=(6.5/58.44) mol : 0.3 L

M=0.371

Answer:

.371 M

Explanation:

Molarity, M,  is calculated as  moles solute/ liters of solvent

6.5 gms of salt is    6.5 / 58.44 = .111225 moles

300 ml = .3 L

.111225 moles / .3 L =  .371 M

Crystals impurities are expected to have high solubility in cold solvents. Hence, option C is correct.

Cold solvent cleaning is a process used to remove grease, wax and other impurities from metal and other parts.

The process is also called degreasing. Cold solvents are sprayed onto the dirty part and it is brushed clean.

Once the filtration process is done the collected crystals should be washed with a little more ice-cold solvent to remove final soluble impurities which would otherwise be left on the surface of the crystals.

Hence, option C is correct.

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Science is divided into various fields of study except for pseudoscience which is not based on the scientific method.

Science refers to the total body of knowledge obtained by applying the scientific method.

Science can be divided into physical sciences, mathematics, life sciences, and social sciences.

In conclusion, science is divided into various fields of study except for pseudoscience which is not based on the scientific method.

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Answer:

it's

answer

is

chlorinesodium gives sodium a different texture

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Answer:

Homo means same

Hetero means different.

Homogeneous mixtures have one phase, it all looks the same, Fruit juice is homogeneous, solutions are homogeneous.

Heterogeneous mixtures have different phases, you can see the different parts, pepper is an example of a heterogeneous mixture.

In a homogeneous mixture the constituents are able to dissolve in each other due to their similar intermolecular forces, whereas in a heterogeneous mixture the constituents are not miscible- meaning they can't dissolve in each other.

To clarify: intermolecular forces describe the way that types of molecules will interact with each other. For instance, water (a polar molecule) and naphthalene (a non-polar molecule) are said to be "immiscible" because their intermolecular forces do not match. The saying goes: "like dissolves like". Meaning that molecules that have similar IFs will be mutually soluble (miscible, in other words).

Answer:

Group C

Explanation:

Precision is how close the values are to each other

Charcoal is the sample of this drawing medium have been dated back to 30,000 BCE and is denoted as option B.

This is referred to a black carbon residue which is heated in insufficient oxygen to give it a light weight.

It is used for drawing and has been in existence for as long as 30,000 BCE hence the reason why it is the most appropriate choice.

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A sample of an ideal gas has a volume of 2.30 L at 281 K and 1.02 atm. 1.76 atm is the pressure when the volume is 1.41 L and the temperature is 298 K.

This law combined the three gas laws that is (i) Charle's Law (ii) Gay-Lussac's Law and (iii) Boyle's law.

It is expressed as

[tex]\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}[/tex]

where,

P₁ = first pressure

P₂ = second pressure

V₁ = first volume

V₂ = second volume

T₁ = first temperature

T₂ = second temperature

Now put the values in above expression we get

[tex]\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}[/tex]

[tex]\frac{1.02\ atm \times 2.30\ L}{281\ K} = \frac{P_2 \times 1.41\ L}{298\ K}[/tex]

[tex]P_{2} = \frac{1.02\ atm \times 2.30\ L \times 298\ K}{281\ K \times 1.41\ L}[/tex]

P₂ = 1.76 atm

Thus from the above conclusion we can say that A sample of an ideal gas has a volume of 2.30 L at 281 K and 1.02 atm. 1.76 atm is the pressure when the volume is 1.41 L and the temperature is 298 K.

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Taking into account the definition of calorimetry, the specific heat of metal is 0.165 [tex]\frac{cal}{gC}[/tex].

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).

So, the equation that allows to calculate heat exchanges is:

Q = c× m× ΔT

where:

In this case, you know:

For metal:

For water:

Replacing in the expression to calculate heat exchanges:

For metal: Qmetal= Specific heat of metal× 50 g× (11.08 C - 45 C)

For water: Qwater=  1.035 [tex]\frac{cal}{gC}[/tex] × 250 g× (11.08 C - 10 C)

If two isolated bodies or systems exchange energy in the form of heat, the quantity received by one of them is equal to the quantity transferred by the other body. That is, the total energy exchanged remains constant, it is conserved.

Then, the heat that the gold gives up will be equal to the heat that the water receives. Therefore:

- Qmetal = + Qwater

- Specific heat of metal× 50 g× (11.08 C - 45 C)= 1.035 [tex]\frac{cal}{gC}[/tex] × 250 g× (11.08 C - 10 C)

Solving:

- Specific heat of metal× 50 g× (-33.92 C)= 1.035 [tex]\frac{cal}{gC}[/tex] × 250 g× 1.08 C

Specific heat of metal× 1696 g×C= 279.45 cal

Specific heat of metal= [tex]\frac{279.45 cal}{1696 gC}[/tex]

Specific heat of metal= 0.165 [tex]\frac{cal}{gC}[/tex]

Finally, the specific heat of metal is 0.165 [tex]\frac{cal}{gC}[/tex].

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Answer:

true

Explanation:

your answer is ture

The statement is true: the force of attraction between particles is greater in ice than in water.

The force of attraction between particles (molecules or atoms) is greater in ice than in water. In the solid state, such as in ice, the particles are closely packed in a regular crystalline structure. The intermolecular forces, specifically hydrogen bonding between water molecules, are strong, leading to a higher force of attraction.

In contrast, in the liquid state, such as in water, the particles have more freedom of movement. The intermolecular forces are still present but are weaker compared to the solid state, resulting in a lower force of attraction between the particles.

Therefore, the statement is true: the force of attraction between particles is greater in ice than in water.

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Answer:

The distributive property of multiplication is used when we need to multiply a number with the sum of two or more addends. The distributive property of multiplication is applicable to addition and subtraction of two or more numbers.

Hope its helpful!

Answer:

The distributive property of multiplication is used when we need to multiply a number with the sum of two or more addends. The distributive property of multiplication is applicable to addition and subtraction of two or more numbers.

Explanation:

Answer:

Length = 681 grams / (44.5 grams / kilometers) = (681 / 44.5) kilometers

Explanation:

The diameter is there to throw us off, so ignore that. There is 681 grams of wire, and since there is 44.5 grams of copper per km of wire, and we want to know how many kilometers of wire makes 681 grams, the equation would be X*44.5 = 681, or X = 681/44.5


Also quora's censoring system is terrible i can't even say kilometers by adding the letter s after "km"

The type of radiation in this scenario is Beta and is denoted as option C.

This is a high-speed electron which is emitted when the nucleus undergoes a radioactive decay during the process of beta decay.

In this scenario the electron is denoted as e with a superscript and subscript of 0 and -1 respectively which is the reason for the change from carbon to nitrogen.

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The arrangement of furniture in a public room can either encourage or discourage social interaction. The correct option is A.

It is the process of exchanging information with others, verbally or otherwise.

The arrangement of furniture in a room filled with people can go a long way to encourage or discourage social interactions.

If physical barriers are put in between two seats such that people can barely see each other, the message may be that very little to no social interaction is allowed.

Without any physical barriers between seats, the message may be that people are free to interact, all other things being equal.

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It is impossible to reach absolute zero because the magnitude of work that is required to remove energy from a gas in order to attain the absolute zero is so high.

The absolute zero is the temperature at which the movement of all the gas molecules is theoretically believed to cease. At the absolute zero, gas molecules remain at fixed positions because according to the third law of thermodynamics, the entropy of a perfectly ordered system is zero.

It is impossible to reach absolute zero because the magnitude of work that is required to remove energy from a gas in order to attain the absolute zero is so high such that it is impractical to attain the absolute zero.

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Answer:

6.76*10^-4 , or 6.8*10^-4 if you consider sig figs

Explanation:

This is a bit of a confusing question, since it incorrectly states that the acid disassociation constant is simply [H+][F-].
Ka = [H+][F-]/[HF] , so plugging in the values, we get
[tex]K=\frac{[2.6*10^{-3}][2.6*10^{-3}]}{[0.01]}\\K=\frac{[2.6*10^{-3}]^2}{[0.01]}\\K=0.000676=6.76*10^{-4}[/tex]

If we were to use the equation in the question, Ka=[H+][F-], we would get the answer 6.76 * 10^-6 , which is not the Ka for HF

The types of geological events or changes that occur at divergent plate boundaries are earthquakes and magma because there is a fault when two plates move away from each other.

The types of geological events or changes that occur at convergent plate boundaries are earthquakes, volcanoes, and the formation of mountains because the tectonic plates are moving towards each other.

The types of geological events or changes that occur at transform plate boundaries are shallow earthquakes, lateral displacement of rock, and a broad zone of crustal deformation.

These geological processes have changed the surface of the earth as they have helped to form ocean basins, and mountain chains, and the formation of glaciers and volcanoes, and earthquakes have changed the underground geology of the earth.

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5850 pounds of this chemical will be used in a 30-day month.

195 pounds per day.

So, 30 days = 195 * 30

= 5850 pounds

Iron(III) chloride is the inorganic compound with the components FeCl 3. additionally known as ferric chloride, it is a commonplace compound of iron inside the +3 oxidation country. The anhydrous compound is crystalline and stable with a melting point of 307.6 °C.

The primary use of ferric chloride is to dispose of impurities in water and for wastewater treatment. Ferric chloride is likewise one of the few water remedy chemical compounds that can sequester odors.

Reasonably poisonous with the aid of ingestion but a strong irritant to the skin and eyes. it's far moderately corrosive and skin touch should be avoided and avoid skin and eye contact.

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The overall balanced reaction equation is;

4Zn(s) + 10H^+(aq) + NO3^-(aq) -----> 4Zn^2+(aq) + NH4^+(aq) + 3H2O(l)

The redox reaction equation is said to be balanced when the number of electron gained is equal to the number of electrons lost.

Now;

1. Reduction and oxidation half-reactions

Zn(s) -----> Zn^2+(aq) + 2e

And

NO3^-(aq) ---->NH4^+(aq) + 3H2O(l)

2. Using the H2O and H+ to balance O and H;

4Zn(s) + 10H^+(aq) + NO3^-(aq) -----> 4Zn^2+(aq) + NH4^+(aq) + 3H2O(l)

3. Balancing the electrons lost and gained; 4Zn(s) + 10H^+(aq) + NO3^-(aq) + 8e -----> 4Zn^2+(aq) + NH4^+(aq) + 3H2O(l) + 8e

4. The overall balanced reaction equation is;

4Zn(s) + 10H^+(aq) + NO3^-(aq) -----> 4Zn^2+(aq) + NH4^+(aq) + 3H2O(l)

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Answer:

Bronsted-Lowry's base is A)KOH

KOH

Answer:

You know that nitrogen-14 has 7 protons in the nucleus because it is an isotope of nitrogen, which has an atomic number equal to 7 . Because nitrogen-14 is a neutral atom, the number of protons it has in its nucleus must be equal to the number of electrons that surround its nucleus.

The thermometer correction at this temperature is =125.7 -122.4

=3.3 degrees celsius

(Very pure benzoic acid has a melting point of 122.4 degrees Celsius.)

A thermometer is a device used to measure and display temperature. It normally consists of a short, glass tube that is hermetically sealed, graduated, and has a mercury or alcohol bulb at one end that expands and contracts with temperature changes.

A significant source of measurement error in melting points could be our thermometer. It is occasionally possible for ordinary laboratory thermometers to be inaccurate and to read temperatures up to 10°C high or low. we should calibrate your thermometer regularly to identify any errors and be able to make adjustments. This will help us avoid this issue.

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Either a Pyrex measuring cup or a graduated cylinder can be used to measure the metric volumes of any liquid.

A graduated cylinder is also called a measuring cylinder and it can be defined as a narrow, cylindrical piece of laboratory equipment with marked lines, which are used to measure the volume of a liquid.

Generally, a student or researcher can use a Pyrex measuring cup to measure the metric volumes of any liquid when a graduated cylinder isn't available.

In conclusion, you should record your estimates and the actual measurements for all the containers that were used in your project.

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In forming a molecular compound, each atom should have valence electrons around it unless there is some specific reasons why this cannot be achieved.

Valence electrons is a negatively charged particle present in the outermost shell of an atom.

Example: Oxygen has 6 valence electrons in its outermost shell, Water has 8 valence electrons.

Thus from the above conclusion we can say that In forming a molecular compound, each atom should have valence electrons around it unless there is some specific reasons why this cannot be achieved.

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At constant pressure, the ratio between the volume expansion of a mole of gas with a high Cp to that of a mole of gas with a low Cp for a given heat input is  Less than 1.

The molar heat capacity of a substance is expressed as Cp when the pressure is constant and as Cv when the volume is constant. These two parameters so describe the molar heat capacity at various pressures and temperatures.

The first law of thermodynamics states that heat delivered to a system can either be converted into internal energy or used to generate work in the environment. An isochoric process is one in which the volume is constant, whereas an isobaric process is one in which a gas interacts with its surroundings at constant pressure.

An isobaric process takes place at constant pressure. Since the pressure is constant and the work is denoted by PV, the force applied is constant.

If gas is to expand at an isobaric pressure at a certain pressure, heat must be introduced into the system at a specific rate. For instance, a movable piston in a cylinder keeps the pressure inside the cylinder constant at atmospheric pressure despite the fact that it is isolated from the atmosphere. In other words, a moveable barrier serves as a dynamic link between the system and a constant-pressure reservoir.

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