Consider the reaction: 2HBr(g)H2(g) + Br2(l) Using standard absolute entropies at 298K, calculate the entropy change for the system when 1.96 moles of HBr(g) react at standard conditions. S°system = J/K Submit Answer

Answer: 62.4g according to a quizlet

Explanation:

Answer:

a. absorbs energy as heat and has positive enthalpy of solution.

Explanation:

A reaction can either be exothermic or endothermic. An endothermic reaction, as the dissolution described in the question, is that which absorbs heat energy from the surroundings in order to start the reaction.

Because an endothermic reaction makes heat lost from the surroundings, the enthalpy (∆H) of the solution will be positive (+). ∆H is got by finding the difference between the enthalpy of the reactants and products and since the enthalpy of a product in endothermic reaction is more, the enthalpy change (∆T) will be positive.

Answer:

what is this question??

Explanation:

it's answer is false

hope it helps you

The molar solubility of mercury (II) bromide (HgBr2) is 7.00 × 10^-7 M. This is the long answer to the problem.

To perform calculations using Ksp for the given equilibrium HgBr2(s)  ↔ Hg2+(aq) + 2Br-(aq) and find the molar solubility of mercury (II) bromide (HgBr2) we have to use the solubility product expression.Ksp for HgBr2 is 6.2 × 10^-20Ksp = [Hg2+][Br-]^2 Since the initial concentration of HgBr2 is given as s, and after dissociation, the concentration of Hg2+ becomes s, while the concentration of Br- becomes 2s.[Hg2+] = s M and [Br-] = 2s MThus,Ksp = [Hg2+][Br-]^2= s(2s)^2= 4s^3= 6.2 × 10^-20Molar solubility of HgBr2 is given as s, therefore;s = (6.2 × 10^-20/4)1/3s = 7.00 × 10^-7 M

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Answer:

emitting or relating to the emission of ionizing radiation or particles

Explanation:

Radiation can damage the DNA in our cells.

In other words!

the giving off of rays of energy or particles by the breaking apart of atoms of certain elements (as uranium)

15mg of atropine sulfate is needed to make 30ml of a 1:200 solution

To find the mass of atropine sulfate, first, the ratio should be converted into a percentage. The given ratio is 1:200

Percentage mass = (1/200) x 100

                            = 1/2%

Percentage mass = 0.5%

Let us consider the mass of atropine sulfate required to be x

Therefore,

0.5/100 ml = x / 30ml

x = (0.5/100)30

x = 0.15g

On converting 0.15g to milligrams we get,

x = 0.15 x 1000

x = 150mg

Therefore, the required mass of atropine sulfate to make 30 ml of a 1:200 solution is 150mg.

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volume, n is the number of moles, R is the ideal gas constant, and T is the temperature. 26.2 g.

To determine the number of grams of CO2, we can use the ideal gas law equation, which states PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature.

Rearranging the equation, we get n = PV / RT.

Given:

P = 769 mmHg = 769 torr

V = 52.3 L

T = 425 K

Converting pressure to atm: 769 torr / 760 torr/atm = 1.012 atm.

Using the value of R = 0.0821 L·atm/(K·mol), we can calculate the number of moles:

n = (1.012 atm) * (52.3 L) / ((0.0821 L·atm/(K·mol)) * (425 K))

≈ 26.2 mol

Finally, since the molar mass of CO2 is approximately 44 g/mol, we can calculate the mass:

Mass = n * molar mass

≈ 26.2 mol * 44 g/mol

≈ 1153 g.

Therefore, the correct answer is 1153 g.

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Answer:

It's not that hard to do figure it out yourself

Explanation:

too simple

Oxygen is more electronegative compared to Sulfur. So, negative charge can be accomodate by oxygen rather than sulfur.

The smallest element component of an atom, the electron has a negative charge. In a neutral atom, there are an equal amount of protons and electrons. One atom and one particle are all that the hydrogen atom has. But in the other hand, the uranium atom possesses 92 protons, which means 92 electrons.

The electron, quark, and nucleo are the three subatomic particles that make up an atom. The core nucleus of the atom, which contains neutrons and protons, is what makes up an atom. Its electrons that surround the nucleus. Protons have a positive charge, revolutionaries have a negative surface charge, and neutrons are neutral.

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Answer:

-149.0K

Explanation:

Charles's law states that the volume of a gas is directly proportional to the absolute temperature under constant pressure.

The equation is:

V1/T1 = V2/T2

Where V1 is initial volume = 6.00L

T1 is absolute initial temperature = 25.0°C + 273 = 298K

V2 is final volume = 2.50L

T2 is our incognite

Replacing:

6.00L/298K = 2.50L/T2

T2 = 2.50L * 298K / 6.00L

T2 = 124.17K

The temperature is 124.17K - 273.15K =

Heating up a reaction increases the speed of a reaction until the enzyme denatures.

Enzyme denaturation occurs when a biological protein catalyst does not work anymore due to a high temperature that alters its tridimensional conformation.

This cellular process (denaturation) is well known to be one of the main causes of enzymatic failure.

In conclusion, heating up a reaction increases the speed of a reaction until the enzyme denatures.

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Answer:

81.6%

Explanation:

mass of acetylferrocene and ferrocene mixture = 22.092 g

mass ratio acetylferrocene and ferrocene mixture = 1 : 1

The sum of the ratios = 2, therefore the mass of each compound will be half the mass of the mixture

mass of each compound in the sample mixture = 1/2 * 22.09 2= 11.046 g

mass of recovered acetylferrocene = 9.017 g

percentage recovery = mass recovered/mass in sample * 100%

percentage recovery of acetylferrocene = (9.017 g / 11.046 g) * 100%

percentage recovery of acetylferrocene = 81.6%

When 5.00 ×\(10^{22\) molecules of ammonia react with 4.00 ×\(10^{22\)molecules of oxygen, approximately 2.32 grams of nitrogen gas are produced.

To determine the number of grams of nitrogen gas produced when 5.00 × \(10^{22\) molecules of ammonia react with 4.00 × \(10^{22\) molecules of oxygen, we need to use the given balanced chemical equation and perform a stoichiometric calculation.

The balanced chemical equation for the reaction is:

\(4 NH_3 + 5 O_2\) → \(4 NO + 6 H_2O\)

From the balanced equation, we can see that 4 moles of \(NH_3\) react to produce 4 moles of nitrogen gas.

First, let's calculate the number of moles of \(NH_3\):

5.00 × \(10^{22\) molecules of \(NH_3\) * (1 mole \(NH_3\) / 6.022 × 10^23 molecules \(NH_3\)) = 0.083 moles \(NH_3\)

Since the stoichiometric ratio between \(NH_3\) and \(N_2\) is 4:4, we can conclude that 0.083 moles of \(NH_3\) will produce 0.083 moles of \(N_2\).

Finally, to calculate the mass of nitrogen gas, we need to use the molar mass of nitrogen gas , which is approximately 28.0134 g/mol.

Mass of \(N_2\) = Number of moles of \(N_2\) * Molar mass of \(N_2\)

Mass of \(N_2\) = 0.083 moles * 28.0134 g/mol = 2.32 grams

Therefore, when 5.00 × \(10^{22\) molecules of ammonia react with 4.00 × \(10^{22\) molecules of oxygen, approximately 2.32 grams of nitrogen gas are produced.

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Answer:

65 million years ago there was a mass extinction that is best known for killing the dinosaurs. There was also a large

deposit of dust that contained substances only found in asteroids, What most likely killed off the dinosaurs?

Explanation:

Answer:

b

Explanation:

Answer:

640 grams

Explanation:

look up Solubility table in wikipedia for potassium nitrate (KNO3)

32 grams of potassium nitrate (KNO3) water solubility at 20 degrees celsius (room temperature) can be dissolved in 100 milliliters (0.1 L) of water.

2 liters = 2000 milliliters

32 grams / 100 milliliters = x grams / 2000 milliliters

cross-multiply

100 * x = 32 * 2000

x = (32 * 2000) / 100

x ≈ 640 grams

chatgpt

The value of the given pressure in atm is 0.18 atm.

A conversion factor, which is a ratio, is a statement of the relationship between two different units of measurement or physical quantities. It is used to convert a quantity from one unit to another while keeping the quantity's numerical value.

We have to note that;

1 atm = 760 mmHg

x atm = 135 mm Hg

Hence;

x = 1 atm*  135mmHg/760 mmHg

x = 0.18 atm

Conversion factors are widely used in various fields, including physics, chemistry, engineering, and finance.

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Explanation:

\(v = vdm \times n\)

Vdm=22.4dm.

mole(n)=4 mol

therefore the total volume

\(v = 22.4 \times 4 \\ v = 89.6dm\)

When an electron in an unknown atom transitions from the n=3 to n=1 energy state, the correct statement describing the change in kinetic energy (KE) and potential energy (PE) of the excited electron is:

KE increases and PE decreases.

As the electron transitions from a higher energy level (n=3) to a lower energy level (n=1), it moves closer to the nucleus. In the process, the electron loses potential energy because it is now in a more stable, lower energy state. Since potential energy decreases, kinetic energy must increase to conserve the total energy of the electron. Therefore, KE increases and PE decreases during this transition.

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option A is the correct one

It represents Mp orBp of a substance at a specific pressure

The empirical formula : Fe₂O₃

Given

34.97g of Iron

15.03g of Oxygen

Required

The empirical formula

Solution

Mol ratio :

Fe(Iron) : 34.97 g : 56 g/mol = 0.624

O(Oxygen) : 15.03 g : 16 g/mol = 0.939

Divide by 0.624 :

Fe : O = 1 : 1.5

Fe : O = 2 : 3

Answer: They are related to spring.

Explanation:

It should be right, I got this question correct.

Answer:

X+ ion cation is smaller than neutral atom because when one or more electrons are lose by an atom it usually result in lose of shell.

And when electron is removed positive/ negative charged ratio increas which causes more effective nuclear charge.

The more effective nuclear charge the less its size.

Explanation:

The process that moves ions from an area of high concentration to an area of lower concentration is called diffusion.

Diffusion is the movement of particles or substances from an area of high concentration to an area of lower concentration until the concentration of the substance is uniform throughout the space.

Key points:

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Micro-organisms change large organic molecules to forms that can be absorbed and used inside the cell through the process of decomposition.

Different organic compounds decompose when plant residues are added back to the earth. Decomposition is a biological process in which complicated organic molecules found in dead matter are physically broken down and biochemically converted into less complex organic and inorganic molecules.

The biological activity and the process of cycling carbon in the soil are both aided by the ongoing increase of decomposing plant residues to the soil's surface. These processes are also aided by the decomposition of soil organic matter and the development and decay of roots. Carbon cycling is the ongoing transformation of organic and inorganic carbon compounds in the earth, plants, and the atmosphere by micro- and macroorganisms.

The organic molecules in organic matter are broken down during decomposition into smaller organic molecules that need additional breakdown or into mineralized minerals. Different organic substances can be broken down by microorganisms in different ways. Amino acids and sugars are among the first organic substances to break down because they are simple to do so. Lignin, phenols, and waxes will last the longest in the earth, while cellulose will degrade more slowly.

In this question, the process that occurs when micro-organisms change large organic molecules to forms that can be absorbed and used inside the cell is decomposition.

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Answer:

Cl: -29.272*

Explanation:

The other temperatures go from lowest to highest, H: -423* F, N: -320* F, F: -306.6* F

Answer:

As a result of the network of hydrogen bonding present between water molecules, a high input of energy is required to transform one gram of liquid water into water vapor, an energy requirement called the heat of vaporization. Water has a heat of vaporization value of 40.65 kJ/

Explanation:

Answer:

"Energy Level" is the correct approach.

Explanation: