For a particular reaction, ΔH=−111. 4 kJ/mol and ΔS=−25. 0 J/(mol·K).


Required:

a. Calculate ΔG for this reaction at 298 K. (in KJ).

b. What can be said about the spontaneity of the reaction at 298 K?

Answer:12

Explanation:

Answer:

The formula for this is Density = Mass/Volume

Therefore:

Density = 30g/30ml

Density = 1 g/ml

However, if you need to convert ml -> L and g -> kg for the proper si unit of mass and volume ..

30ml = 0.03L ; (divide 30mL by 1000)

30g = 0.03kg ; (divide 30g by 1000)

Density = 0.03kg/0.03L

Density = 1 kg/L

Explanation:

The chemical formula for octane, C8H18, is an alkane and a hydrocarbon. Its condensed structural formula is CH3(CH2)6CH3. The amount and location of branching in the carbon chain determine the various structural isomers of octane.

Carbon is represented by the letter C, octane by the formula C8H18. As a result, there will be 8 moles of carbon for every mole of C8H18.

Utilizing the molar mass of octane, convert 20 kg of octane to moles of octane.

Octane's molar mass is calculated as (8*12.011)+(18*1.008)=114.23 g/mole, where 8 and 18 are the molecule's atoms and 12.011 and 1.008 are the carbon and hydrogen atoms' individual molar masses.

20kg C8H18*1000g/kg*mole

C8H18/114.23g C8H18 = 175.1 moles of octane.

Put that quantity of moles into moles of carbon now:

1400.8 mole C is equal to 175.1 mole C8H18 * (8 mole C/mole C8H18).

Now keep in mind that a mole of a specific element equals 6.022*1023 atoms.

As a result, your final answer of 8.4*1026 atoms, or 1400.8 mole C, is identical to 1400.8*(6.022*1023) atoms C.

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Based on the calculations, the total pressure of the final products is equal to 1.76 atm.

From the information provided about this chemical reaction, we can logically deduce the following parameters:

Next, we would write the properly balanced chemical equation for this chemical reaction:

                               I₂ + 5F₂   ⇒  2IF₅

Also, we would determine the number of moles of each atom of I₂ and F₂:

\(Number \;of \;moles = \frac{mass}{molar\;mass}\)

Substituting the given parameters into the formula, we have;

Number of moles = 63.45/253.8

Number of moles = 0.25 moles.

Assuming I₂ were limiting, we would need:

5 × 0.25 = 1.25 moles of F₂.

For fluorine gas, we have:

PV = mRT/MM

Mass, m = PVMM/RT

Mass, m = 2.5(5.00)(38)/(0.0821 × 298)

Mass, m = 475/24.4658

Mass, m = 19.42 grams.

Number of moles = 19.42/38

Number of moles = 0.51 moles.

The total number of moles = 0.25 + 0.51 = 0.76 mol.

For the mole fraction of I₂, we have:

Mf = 0.25/0.76

Mole fraction = 0.33.

For the mole fraction of F₂, we have:

Mole fraction = 1 - 0.33 = 0.67.

Next, we would determine the total pressure of the two elements by applying Dalton's law:

Total pressure = 0.33 × 0.27 + 0.67 × 2.5

Total pressure = 1.76 atm.

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The type of mass movement that is LEAST coherent (most like a fluid) is a mudflow. The correct option is d.

Mass movement refers to the downhill movement of earth materials due to gravity. There are different types of mass movement, including slump, rockslide, creep, and mudflow. The coherency of a mass movement refers to the degree of internal strength or viscosity of the material involved.

The more coherent the material, the less it flows like a fluid. Among the given options, mudflow is the least coherent or most fluid-like type of mass movement. Mudflow refers to the rapid downhill movement of a mixture of water and fine-grained sediment, such as clay and silt.

Mudflows are highly fluid and can travel at high speeds, posing a significant hazard to life and property in areas prone to landslides and flash floods. In contrast, slumps, rockslides, and creep involve more cohesive materials and exhibit less fluid-like behavior. Therefore, the correct option is d.

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The mass of 3.02 cm³ of Bismuth is 29.45 grams.

Bismuth is an element that belongs to group 15 of the periodic table.

We know that the density(ρ) of a substance is given by the following formula,

Density (ρ) = Mass of the substance/Volume of the substance

As the density and volume of the metal are given, the mass of the element can be calculated by putting the given values in the given formula.

9.75 g/cm³ = Mass/3.02 cm³

Mass = 29.45 grams

Thus, the mass of 3.02 cm³ of Bismuth is 29.45 grams.

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Answer:

There are four significant figures

Explanation:

There are four digits within 32.06, 3, 2, 0, and 6. Significant figures are the number of digits included in a number (besides the 0 in 0.xxx), therefore, there are four significant figures :)

Answer:

high melting point

Explanation:

high melting point

Answer:

ionic compond

Explanation:

Sn(ClO3)4

Answer: Friction

Explanation: Friction is a force that opposes motion. When two objects are in contact, friction is acts in a direction opposite to the motion of the object.  Please give me brainliest!!!!!!!

Answer: friction: The resistance an object meets when moving over a surface or through a gas or liquid; it is the force that resists the motion of two surfaces that are touching each other.

Explanation:

Answer:

See Below

Explanation:

As this question is about the type of transformer, i am not going to discuss the detail the construction of it, rather the underlying principle. In practices transformer has two component namely primary and secondary. For an ideal transformer energy must conserved.

\(P_p=P_s\)

\(\\\Rightarrow V_{p}I_{p} & = & V_{s}I_{s}\qquad\text{as}\qquad \boxed{P=VI}\\\text{or},\frac{V_{p}}{V_{s}} & = & \frac{I_{s}}{I_{p}}\tag{1}\end{eqnarray}\)(1)

Where, \(V_p\), \(I_p\) are the voltage and current in the primary circuit and \(V_s\), \(I_s\) are that for secondary circuit respectively. If consider the number of turns of the coil in primary (\(N_p\)) and secondary circuit \((N_s)\) , then expression (1) further extends to

\(\frac{V_{p}}{V_{s}} = \frac{I_{s}}{I_{p}}=\frac{N_{p}}{N_{s}}\tag{2}\)       (2)

Equation (2) is the main equation for transformer.

Now consider

\(\frac{V_{p}}{V_{s}} = \frac{N_{p}}{N_{s}}\)

Case-1: If \(N_{p} > N_{s}\) then \(V_{s} < V_{p}\) . This the step-down transformer. Where the number of turns in the primary is greater than that of secondary.

Case-2:If \(N_{s} > N_{p}\)  then \(V_{s} > V_{p}\). This the step-up transformer. Where the number of turns in the primary is less than that of secondary.

A transformer is an electrical device that uses electromagnetic induction to transmit electrical energy between two or more circuits. This induction produces a force across the conductor, which is subsequently subjected to varying magnetic fields. In a power application, transformers typically reduce or enhance alternating current voltages.

This is where a step down transformer comes in, to increase or decrease an alternating current current. The primary voltage is larger than the secondary voltage in this sort of device. In a 220v application, a step down transformer will be required to use a 110v product. These transformers frequently rely on magnetic induction between coils. This is the component that transforms voltage and/or current levels. As a result, you'll have two (or more) insulated wire coils twisted around an iron core. When you add voltage to the primary (one of the coils), the core is magnetized and voltage is induced in the secondary (other coil). The voltage reduction is determined by the ratio of turns in the two sets of windings. As a result, if you have 200 turns on the main and 100 on the secondary, your ratio will be 2:1. The voltage ratio of a single transformer remains constant throughout all usage of that transformer.

To recap, a step down transformer transforms low current, high voltage electricity to high current, low voltage power. It is also possible to use a step down transformer as a reverse connection. To do this, a single phase step down transformer of 1 kva or greater is required.

The primary reason we may want a step down transformer in the first place is to conserve energy. When electrons move down a metal wire, they do not follow a straight, smooth route. They jostle around, wasting energy and heating up the wire. However, greater voltage and lower current consume less energy. This is why power plants deliver extremely high voltages down the line to your home, workplace, and so on.

Another reason for such high voltages is for applications that require them, like as industrial facilities. Their massive, powerful machinery may demand this voltage and do not need a step down transformer. These circumstances may necessitate the use of a step-up transformer, which may be accomplished, as previously stated, by utilizing a step-down in reverse. Because it is not the most efficient method, it is preferable to invest in a genuine step up transformer after researching your particular voltage needs. A step up transformer is one that raises the voltage from its main to secondary power source. In this sort of transformer, the secondary coil has more turns than the main coil, hence the induced secondary coil voltage is greater than the applied voltage on the primary coil.

When the relationship between voltage and turns in each coil is shown, it looks like this:

(Primary coil voltage minus secondary coil voltage) = (Primary coil turns minus secondary coil turns)

___________________

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The chemical equation when aluminum metal reacts with solid sulfur to produce solid aluminum(III) sulfide would be \(2Al (s) + 3S (s) -- > Al_2S_3 (s)\)

The reaction between aluminum metal and solid sulfur to produce aluminum (III) sulfide would be as follow:

The chemical symbol of aluminum metal = Al

The chemical symbol of sulfur = S

Aluminum has a valence electron of 3 while sulfur has a valance electron of 2. In order to form a bond between them, the valence electron of one becomes the subscript of the other. In other words, aluminum receives the valence of sulfur (2) while sulfur receives the valence of aluminum (3). Thus:

\(2Al +3 S --- > Al_2S_3\)

When all the phases are considered, the equation becomes: \(2Al (s) + 3S (s) -- > Al_2S_3 (s)\)

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Aluminum metal reacts with solid sulfur to produce solid aluminum(III) sulfide. Express your answer as chemical equations. identify all the phases in your answer.

The element X is titanium.

According to the question, the percentage by mass of Cl in XCl4  is 75.0%.

The percentage by mass is obtained from;

Mass of element in the compound/molar mass of compound * 100

Hence;

Let the mass of the unknown element be X

75 = 142/X + 142 * 100

75 (X + 142) = 142 * 100

75X + 10650 = 14200

75X =  14200 - 10650

X = 14200 - 10650/75

X = 47

Hence, X is titanium.

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Prior to giving nitroglycerin, an additional diagnostic test that is often indicated is an electrocardiogram (ECG/EKG).

An electrocardiogram (ECG or EKG) is a diagnostic test that measures the electrical activity of the heart. It is a non-invasive procedure that involves attaching electrodes to the patient's chest, arms, and legs to detect and record the electrical signals produced by the heart.

During an ECG, the electrodes detect the electrical impulses generated by the heart's natural pacemaker, the sinoatrial (SA) node, and the subsequent conduction of these impulses through the heart. The electrical activity is then recorded as a series of waveforms on a graph, which can be interpreted by a healthcare professional.

The ECG provides valuable information about the heart's rhythm, rate, and overall electrical conduction. It helps in diagnosing various cardiac conditions, including abnormal heart rhythms (arrhythmias), heart attacks (myocardial infarction), ischemia (lack of blood flow to the heart), and structural abnormalities.

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The substance that was NOT part of the mixture used in the Urey-Miller experiments is: C. carbon dioxide

The Urey-Miller experiments, conducted in 1952 by Stanley Miller and Harold Urey, aimed to simulate the conditions of early Earth's atmosphere and investigate the formation of organic compounds. The experiments involved creating a mixture of gases thought to be present in the early Earth's atmosphere and subjecting them to electrical discharges to simulate lightning. The purpose was to see if these conditions could produce organic molecules, such as amino acids. The mixture used in the Urey-Miller experiments typically consisted of water (A), hydrogen gas (B), ammonia (D), and methane (E). Carbon dioxide (C) was not part of the original mixture used in these experiments.

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Answer:

Pure water is a non conductor of electricity and dilute acids in their aqueous solutions form free ions, which conducts electricity. Thus when we need to electrolyse water, a dilute acid is added to increase its conductivity.

The balance equation of the reaction is

\(3KClO_3+AlP\to Al(ClO_3)_3+K_3P\)

The species in the reaction are;

Let's try to balance the potassium on both sides of the reaction.

\(KClO_3+AlP\to Al(ClO_3)_3 + K_3P\\3KClO_3+ AlP \to Al(ClO_3)_3 + K_3P\\\)

To do this, we need to add 3 to the reactant side of the reaction to balance the effect on the product side of the reaction.

The balance equation of the reaction is

\(3KClO_3+AlP\to Al(ClO_3)_3+K_3P\)

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The mole fraction of CO₂ in a solution made up of 2 mL of 0.002 M solution of CO₂ and 8 mL of 0.002 M solution of CN⁻ is 0.2.

The mole fraction of a solute in a solution is defined as the amount of that solute divided by the total number of moles present in the solution. It is the most commonly used concentration unit for mixing gases and solutions.

The mole fraction is given by:

mole fraction of component i = number of moles of component i / total number of moles in the solution

For the given solution made up of 2 mL of 0.002 M solution of CO₂ and 8 mL of 0.002 M solution of CN⁻, we can calculate the mole fraction of CO₂ as follows:

A number of moles of CO₂ in 2 mL of 0.002 M solution = 0.002 mol/L × (2 mL/1000 mL) = 0.000004 mol

A number of moles of CN⁻ in 8 mL of 0.002 M solution = 0.002 mol/L × (8 mL/1000 mL) = 0.000016 mol

Total number of moles in the solution = 0.000004 mol + 0.000016 mol = 0.00002 mol

Mole fraction of CO₂ = 0.000004 mol / 0.00002 mol = 0.2

Therefore, the mole fraction of CO₂ in the given solution is 0.2.

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\(LiNO_{3}\)There are 0.075 moles of \(LiNO_{3}\) in 250 mL of a 0.30 M solution.

To determine the number of moles of \(LiNO_{3}\) in 250 mL of a 0.30 M solution, we can use the formula:

moles of solute = concentration (M) x volume (L)

First, we need to convert the volume from milliliters (mL) to liters (L):

250 mL = 0.25 L

Next, we can substitute the given values into the formula:

moles of \(LiNO_{3}\) = 0.30 M x 0.25 L

moles of \(LiNO_{3}\) = 0.075 mol

Therefore, there are 0.075 moles of \(LiNO_{3}\) in 250 mL of a 0.30 M solution.

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Approximately 3.04 grams of magnesium would be required to react with 0.25 moles of hydrochloric acid.

To determine the mass of Mg required, we need to use the balanced chemical equation for the reaction between hydrochloric acid (HCl) and magnesium (Mg):

2HCl + Mg → MgCl2 + H2

From the balanced equation, we can see that 2 moles of HCl react with 1 mole of Mg. Therefore, if 0.25 mol of HCl reacts, we would need half of that amount, which is 0.125 mol of Mg.

To calculate the mass of Mg required, we need to multiply the number of moles of Mg by its molar mass. The molar mass of Mg is given as 24.31 g/mol. Therefore, the mass of Mg required can be calculated as follows:

Mass of Mg = Number of moles of Mg × Molar mass of Mg

Mass of Mg = 0.125 mol × 24.31 g/mol

Mass of Mg = 3.04 g

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Answer:

1. B

2.C

3.D

4.Sorry don't this one :(

5.A

Explanation:

please give me at least 20 points ❤

Polar covalent bonds are formed when the electrons in the bond are not shared equally between the two nuclei. One of these molecules contains polar bonds is H2O.

Polarity occurs when the electron pair of a bond is unevenly distributed between two atoms. A polar bond has a positive and negative end, unlike a nonpolar bond. The polarity of a bond can be determined by a difference in electronegativity between two atoms. Polar covalent bond is a type of covalent bond in which the atoms share electrons in an unequal manner.

Polar covalent bonds have a positive and a negative end. The positive end of the bond is that part of the bond that is less electronegative, whereas the negative end is that part of the bond that is more electronegative. The molecule that contains polar bonds is H2O (water), the bond between the oxygen atom and the hydrogen atoms in water is polar because the oxygen atom is more electronegative than the hydrogen atoms, causing the electrons to be drawn closer to the oxygen atom, creating a partial negative charge on the oxygen and a partial positive charge on the hydrogen atoms. As a result, water has a polarity.

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Answer:

B

Explanation:

Answer:

its  D  I  just  took  the  test

Explanation:

Answer:  Protons plus neutrons

Explanation:  Atomic mass of an element is the sum of protons and neitrons.  They are 1 amu (atomic mass unit) each.  Electrons are negligible mass and are left out of the calculation.

The mass number of an atom  is  calculated by adding  proton plus neutrons , therefore option (b) is correct.

An atom’s mass number, also called atomic mass number is the total number of protons and neutrons present in an atomic nucleus.

Protons and neutrons are collectively known as nucleons.

An electron is almost negligible in weight. Thus, the atomic mass of an atom is almost the same as its mass number.

The total number of protons and neutrons present in one atom of an element is known as its mass number.

Mass number = Number of protons + Number of neutrons

The mass number of an atom  is  calculated by adding  proton plus neutrons , hence option (b) is correct.

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Answer:

Hope it's correct

Explanation:

2 mol of C2H6 = 7 mol of O2

So 20 mol of C2H6 = ? (20/2)*7 = 70 mol

Answer:

A

Explanation:

the same as an electron

Answer:

convection

Explanation: