According to the following reaction, how many moles of hydrobromic acid are necessary to form 0.723 moles bromine?
2HBr(aq) → H₂(g) + Br₂(l)
How many mol of hydrobromic acid?

Answer:

I think it's option 3 (From top to bottom)

Explanation:

When the water is at a higher altitude there's only about 40 percent heat that the equator does.

Answer:

x/2

Explanation:

X = 2 molecules of H2

For 2 molecules of H2, there's only 1 molecule of O2. Meaning, there's twice the amount of H2, so O2 = x/2 molecules.

I hope I'm understanding this question right.

0.1875grams/cm3 is the density of the cube below if

the mass is 45g7.

A material substance's density is its mass per unit volume. D is density, M is mass, and V is volume, therefore the formula for density is d = M/V. In terms of grammes per cubic centimeter, density is frequently expressed. As an illustration, the density of water is 1 g/cc, whereas the density of the Earth is 5.51 g/cc.

As kilos per cubic metre, density can also be calculated (in metre-kilogram-second or SI units). As an illustration, air has a density of 1.2 kilograms per cubic metre. Textbooks and manuals contain lists of the densities of common solids, liquids, and gases. The mass of a body can be calculated from its volume using density, and vice versa. The mass is equal to the volume multiplied by the density (M = Vd), whereas the volume is equal to the mass divided by the density (V = M/d). You may calculate a body's weight by multiplying its mass by the acceleration of gravity, which is typically of more practical significance than its mass.

Derive the mass and volume of this sugar cube

Mass = 45 grams

sides are h=16m

                L=5cm

               W=3cm

ρ = m/V

ρ = density, kg/m3, or g/(cm)3

m = mass, in kg or g

V = volume, in m3 or (cm)3

Here, ρ = density, m = mass, and v = volume.

ρ = 45/16×5×3

Density of the cube is 0.1875grams/cm3

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Answer:

89°C

Explanation:

Combined Gas Law (P₁V₁)/T₁ = (P₂V₂)/T₂

(1.25 atm)(450 mL)/(65°C) = (0.89 atm)(865 mL)/T₂

8.653846154 = 769.85/T₂

T₂ = 769.85/8.653846154

T₂ = 88.96044444 = 89°C

Answer:

The first energy level has 2 electrons located in the 1s-orbital and the second energy level, which in fluorine's case is the outermost energy level, has 7 electrons, 2 in the 2s-orbital and 5 in the 2p-orbitals. This means that fluorine has a total of 7 valence electrons.

Answer: Yes

Explanation:

Answer:

ftb

Explanation:

Answer:

Wavelength

Explanation:

Pls give me Brainliest

The safety feature aimed at keeping nuclear radiation contained is steel-reinforced concrete.

A nuclear power plant is a building with reactors that contain controlled nuclear reactions to produce energy.

Nuclear power plants are able to generate warm water by using atomic properties of matter  (i.e.,m the process of nuclear fission), which is in turn converted into steam to move turbines.

The walls of nuclear power reactors are composed of steel-reinforced concrete in order to avoid radiation release.

In conclusion, the safety standard property that maintains nuclear radiation contained is steel-reinforced concrete.

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Answer:

8 ATM

Explanation:

P1 V1 = P2 V2

P1 V1 / V2 = P2

1 * 2 / .25 = 8 ATM

This is an exercise of Equation of state of an ideal gas.

To start solving this exercise, we obtain the following data:

The gas law is derived from the gas law of Boyle, Charles, Gay Lussac and General.

This means that if the volume is doubled the pressure is reduced by half, and if the pressure is made three times greater, the volume will be one third of what it was originally which can be summarized in the equation.

P₁V₁=P₂V₂ ⇒ General Formula

Where:

The word inversely proportional means: "That if the pressure increases the volume decreases but proportionally".

We clear formula for final pressure:

\(\bf{P_{2}=\dfrac{P_{1}V_{1}}{V_{2}} \ \ \to \ \ \ Formula }\)

We clear our data in the formula:

\(\bf{P_{2}=\dfrac{(1.0 \ atm)(2.0\not{l})}{0.25\not{l}} }\)

\(\bf{P_{2}=8 \ atm}\)

If the volume is reduced to 0.25 liters, the new pressure of the gas will be 8 atm.

The [OH-] in a solution that is 0.200 M in NaF. Ka for HF is 6.7 x 10^-4 is 1.73 x 10⁻⁶M . Therefore, option C is correct.

Any mixture of one or more solutes that have been dissolved in a solvent is referred to as a solution. To create a homogenous mixture, a solute must dissolve in a solvent. To create a homogenous mixture, a solute must dissolve in a solvent.

A particular kind of homogenous mixture made up of two or more substances is known as a solution. A solute is a substance that has been dissolved in a solvent, which is the other substance in the mixture.

Given that,

0.200M NaF → 0.200M Na⁺(aq) + 0.200M F⁻(aq)

Na⁺ + H₂O → no reaction  because sodium ion will not hydrolyze to form weak electrolyte

F⁻ + H₂O → HF + OH⁻ ( F⁻ hydrolyzes in water to form weak acid HF )

Now, Analysis:

                 F⁻        +    H₂O   →     HF     +      OH⁻

C ( i ):      0.200M         -------         0.00M       0.00M

ΔC :          -x                 -------            +x              +x

C ( eq ) : 0.200-x            -------              x                x

        ~0.200M

Kb = Kw/Ka(HF) = [HF][OH⁻]/[F⁻]

= x²/ ( 0.200 )

= 1x10⁻¹⁴/6.7x10⁻⁴

x = [HF] = [OH⁻]

= √(0.200)(1x10⁻¹⁴)/(6.7x10⁻⁴)

= 1.73 x 10⁻⁶M in OH⁻ ions.

Thus, option C is correct.

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Answer:

mass = moles x molar mass

m= 3.7 x (23x2+16)

m= 3.7x62

m= 229.4g

198.4 grams are there is 3.7 moles of Na₂O.

The number of moles is defined as the ratio between given mass and molar mass.

\(\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}\\\\\)

Given:

Number of moles= 3.7 moles

To find:

Mass=?

Molar mass of Na₂O= 62 g/mol

Thus substituting the values in the given formula

\(\text{Given mass}=\text{Number of moles}*\text{Molar mass}\\\\\text{Given mass}= 3.2 \text{moles}*62 \text{g/mol}\\\\\text{Given mass}=198.4 \text{g}\)

Thus, 198.4 grams are there is 3.7 moles of Na₂O.

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It will be used 1.95 grams of the reactant in the reaction.

To calculate the density of a given substance, use the following expression:

                                                     \(d = \frac{m}{v}\)

Thus, having the values ​​of volume and density, just apply the formula above to find the value of mass, so that:

                                               \(0.975 = \frac{m}{2}\)

                                            \(m= 1.95 grams\)

So, it will be used 1.95 grams of the reactant in the reaction.

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The ion with a +3 charge, 28 electrons, and an atomic mass of 71 is the aluminum ion (\(Al^{3+}\)).

Aluminum (Al) typically has an atomic number of 13, which means it has 13 protons and 13 electrons in its neutral state. However, in the given ion, \(Al^{3+}\), the ion has lost three electrons, resulting in a +3 charge. This means that the ion now has 13 protons and only 10 electrons remaining, giving it a net positive charge of +3.

The atomic mass of aluminum is 26.98 atomic mass units (amu). The given ion has an atomic mass of 71 amu, which suggests that the ion has gained additional particles. In this case, the ion has also gained three neutrons, resulting in a higher atomic mass.

The total number of particles (protons, neutrons, and electrons) in the ion can be calculated by adding the number of protons (13) and the number of neutrons (3), which equals 16. Since the ion has a net charge of +3, it only contains 10 electrons.

In summary, the ion with a +3 charge, 28 electrons, and an atomic mass of 71 is the aluminum ion (\(Al^{3+}\)), which has 13 protons, 10 electrons, and 3 neutrons.

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Answer:

the answer is letter B,FALSE

Explanation:

To perform calculations involving the pH of a solution, we can use the following logarithmic equation:

pH = - log [H3O+] or pH = - log [H+]

In calculations involving the pH of a solution, we always use logarithm to base 10.

In this case, we have:

[H+] = 4.51 x 10^-4 M

So:

pH = -log 4.51 x 10^-4

pH = 4 - log 4.51

pH = 4 - 0.65

pH = 3.35

Answer: pH = 3.35

Answer:

1. C) Hydrogen of water is separated from oxygen.

2. A) Carbon dioxide

3. D) Mechanical energy to chemical energy

4. B) Glucose

5. B) Respiring while swimming underwater

6. A) Oxygen

7. B) Photosynthesis depends on the carbon dioxide released during cellular respiration.

8. A) It is affected by social concerns.

9. D) Chlorophyll stores chemical energy needed for photosynthesis.

10. Cellular respiration is the process by which organisms use oxygen to break down food molecules to get chemical energy for cell functions.

Brainlist Pls!

Answer:

E°(Ag⁺/Fe°) = 0.836 volt

Explanation:

3Ag⁺ + 3e⁻ => Ag°;            E° = +0.800 volt

Fe° => Fe⁺³ + 3e⁻ ;             E° = -0.036 volt

_________________________________

Fe°(s) + 3Ag⁺(aq) => Fe⁺³(aq) + 3Ag°(s) ...    

E°(Ag⁺/Fe°) = E°(Ag⁺) - E°(Fe°) = 0.800v - ( -0.036v) = 0.836 volt

Answer:

Congestive heart failure

Explanation:

Congestive heart failure happens when your heart gets too weak to pump blood from the lungs out to the body. Pressure builds up in the heart which puts pressure on the blood vessels of the lungs. This will lead to leakage of the vessels and the fluids build up in the air sacs of the lungs. This condition is called pulmonary edema.

Pulmonary edema occurs when fluid builds up in the lungs making it hard to breathe. It may start out as running out of breath easily but if left untreated (both conditions) symptoms get worse over time.

Answer:

the light would be less bright

Explanation:

The term that refers to the passing of a wave through an object is "transmission."

Transmission refers to the process by which a wave passes through an object or medium. In the context of sound, transmission occurs when sound waves travel through different substances, such as air, water, or solids.

When a sound wave encounters an object, it can be transmitted through it, reflected off it, or absorbed by it, depending on the properties of the object and the medium through which the sound is traveling.

For example, when you speak into a microphone, the sound waves produced by your voice travel through the air and are transmitted to the microphone's diaphragm. The diaphragm converts the sound waves into electrical signals, which can then be amplified and reproduced as sound through speakers.

In summary, transmission is the term used to describe the passage of a wave, such as a sound wave, through an object or medium. It is an essential concept in understanding how waves interact with their surroundings and how sound propagates through different materials.

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Answer:

Gas exchange occurs in microscopic dead-end air-filled sacs called alveoli, where a very thin membrane (called the blood-air barrier) separates the blood in the alveolar capillaries (in the walls of the alveoli) from the alveolar air in the sacs.

Explanation:

Answer:

0.0365 is your answer

Explanation:

Answer:

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Answer:

a. Gas pressure: decreases

b. Gas moles: remain constant

c. Average speed of gas molecules: decreases

d. Average distance between molecules: large

Explanation:

The kinetic molecular theory of gases explains the behavior and properties of gases.

In this case, the gas is cooled, so its temperature decreases.

a. Gas pressure:

To analyze the gas pressure we can use the Ideal Gas formula P.V=n.R.T, where pressure and temperature are directly proportional, that is, if the temperature decreases, the gas pressure will also decrease.

b. Gas moles:

The moles of gas remain constant, since the flask is sealed, so gases cannot enter or leave the flask.

c. Average speed of gas molecules:

Temperature is related to the average speed of movement of molecules, so as temperature decreases, the average speed of molecules also decreases.

d. Average distance between molecules:

As the average speed of molecules decreases, they stay in place, hardly moving, so the average distance between molecules is greater than if the molecules were moving faster.

Answer:

x = w/v

General Formulas and Concepts:

Pre-Algebra

Explanation:

Step 1: Define

v = w/x

Step 2: Solve for x

Answer:

The mechanism for the formation of hexamethylenetetraamine predicts the formation of aminomethanol from the addition of ammonia to formaldehyde. This molecule subsequently undergoes unimolecular decomposition to form methanimine and water.

Explanation:

Brainliest please?

Answer:

Electrons.

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