an aqueous solution of hydrobromic acid is standardized by titration with a 0.162 m solution of barium hydroxide. if 29.3 ml of base are required to neutralize 25.9 ml of the acid, what is the molarity of the hydrobromic acid solution? m hydrobromic acid

In case of exothermic or endothermic reactions  where heat is  absorbed  or released  there is a need to measure specific heat, change in temperature and time to heat.

An exothermic reaction is defined as a chemical reaction which involves release of energy in the form of light,heat .In these reactions, energy is transferred from system to surroundings rather than taking energy from surroundings into system as in endothermic reactions.

In an exothermic reaction,change in enthalpy is negative.Therefore, it can be inferred that net amount of energy which is required to start the exothermic reaction is less than the net amount which is released by the reaction.

Examples of exothermic reactions are combustion reactions, detonation of nitroglycerin , neutralization reactions and nuclear fission.

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The average molar mass of sulfur is 32.84g/mol

The average atomic mass of a chemical element is calculated by taking into account the atomic masses of its naturally occurring isotopes and their respective abundances

Here given data is natural sulfur consists of three isotopes :

95.0% sulfur-32 = 31.97 amu

0.75% sulfur-33 = 32.97 amu

4.21% sulfur-34 = 33.96 amu

So, we have to find average molar mass of the sulfur = ?

Formula for average molar mass = ∑i × isotope i  × abundance i

³²S = 95.0% abundance = 31.97 amu

³³S = 0.75% abundance = 32.97 amu

³⁴S = 4.21% abundance = 33.96 amu

This means that average molar mass of sulfur is

Average molar mass = 31.97 amu×95.0 +  32.97 amu× 0.75 + 33.96 amu×4.21

Average molar mass = 32.84g/mol

Average molar mass of sulfur is 32.84g/mol

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1.enthalpy ΔH = -45.1872 Kj/mol

2.enthalpy ΔH = -2.092 Kj/mol

3.enthalpy ΔH = -13.888 Kj/mol

A thermodynamic system's internal energy and the product of its pressure and volume are added to form enthalpy, which is one of the system's properties. It is a state function that is frequently used to monitor chemical, biological, and physical systems at a constant pressure that is conveniently given by the sizable surrounding environment. The labor necessary to determine the system's physical dimensions, or to make room for it by displacing its surrounds, is expressed by the pressure-volume phrase. Under typical conditions, the pressure-volume term is very small for solids and liquids and moderately small for gases. As a result, in chemical systems, enthalpy serves as a stand-in for energy; bond, lattice, solvation, and other concepts referred to as "energies" in chemistry are actually differences in enthalpy.

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To solve this we need to have knowledge of differential rate law which relate the rate to the concentration and time The option B is correct option.

A differential rate law represents the rate of a reaction . According to this rate is directly proportional to changes in the concentration of reactants and inversely proportional to specific interval of time. There is another expression of rate law which is integrated rate law which is just opposite of differential rate law

The given equation is

[tex]A+3B\rightarrow2C[/tex]

Rate of B= rate of C

[tex]\frac{1}{3}d\frac{[B]}{dt} =\frac{1}{2}d\frac{[C]}{dt}[/tex]

[tex]d\frac{[B]}{dt} =\frac{3}{2}d\frac{[C]}{dt}[/tex]

Thus option B is correct option.

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If an elephant of mass 500kg stands on the ground, each foot has an area of 0.08m2, the pressure exerted on ground is  15,625 Pa.

In the physical sciences, pressure is defined as the perpendicular force per unit area or the stress at a point within a confined fluid. A 42-pound box with a bottom area of 84 square inches will press down on a surface with a pressure equal to the force divided by the area over which it is applied, or half a pound per square inch.

Atmospheric pressure, which at sea level is roughly 15 pounds per square inch, is the weight of the atmosphere pressing down on each unit area of the Earth's surface. One pascal is equal to one newton per square meter when expressed in SI units, which is how pressure is calculated. Nearly 100,000 pascals of atmospheric pressure are present.

We have given that mass is 500kg and area of each leg is 0.08m²

The formula for Pressure is

Pressure = Force/Area

Let us find the weight first

⇒ weight = mass × g

= 500kg × 10N/kg

= 5000N

Total contact area = 0.08m² × 4

= 0.32m²

Finally, we will calculate the pressure

⇒ Pressure = Force/Area

= 5000N/0.32m²

= 15625 Pa

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The work done by the isothermal compression of the gas is -666.7 J.

The work done by the compression of a gas in an isothermal process or at constant temperature  is given by the formula below:

Work done, W = nRT ln(Vf / Vi)

where;

From the data provided:

number of moles, n = 0.250 moles

Molar gas constant, R = 8.314 J/K/mol

Temperature, T = 292 K

Vf = 2.00 L

Vi = 6.00 L

W = 0.25 * 8.314 * 292 * ln(2/6)

Work done = -666.7 J

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Answer:

Explanation:

Here, we want to get the value of the oxidation number of Z

Generally, hydrogen has an oxidation number of +1, while oxygen has an oxidation number of -2

The total oxidation number is zero

Thus:

Answer:

salt

Explanation:

cause salt is a solid item

Answer:

Explanation:

Here, we want to write the net ionic equation

We start by writing the complete equation of reaction:

Now, we write out the ions as follows:

The Chromium and Nitrate ions are spectator ions

Thus, we have:

The ph after 25.0 ml of the naoh solution have been added is 1.222.

You are aware that the balanced chemical equation states that sodium hydroxide and hydrochloric acid balance each other out in a 1:1 mole ratio.

NaOH (l) + HCl (l) = NaCl (l) + H2O (l)

As a result, equal amounts of sodium hydroxide and hydrochloric acid must be used to completely neutralize a substance, producing a neutral solution with a pH of 7 at ambient temperature.

Although the molarities of your two solutions are equivalent, the hydrochloric acid solution has a volume of 100 mL divided by 25.0 mL, which equals four.

[tex][H3O+]=(75⋅0.100103).moles H3O+125⋅103.L=(75⋅0.100125)mol L−1This means that you havepH=−log(75⋅0.100125)=1.222−−−−−[/tex]

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Answer: the answer is D) The first equation should be multiplied by 9 and the second equation by −4.

Explanation:edge 2022

The balanced version of the half reaction is H2S - S + 2H+ , this is how we balance half reactions.

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when 35.0kg of sio2 react with 25.3kg of c, 14.4kg of si are recovered.

The percent yield for the reaction is 8.8012%

sio2 + 2c = si + co

moles of sio2 = 35*[tex]10^{3}[/tex] / 600.02   = 582.503mol

moles of c = 25*[tex]10^{3}[/tex] / 12 = 2.1083 kcal

yield = moles of si produced / mole of sio2 used

        = 512.72/582.36  * 100

        = 8.8012%

chemical reaction is a process in which one or more substances the reactants—are changed into one or more additional substances the products. Chemical elements and compounds are both substances. To produce various compounds as products, a chemical reaction rearranges the atoms that make up the reactants.

Technology, culture, and life itself are all influenced by chemical interactions. Numerous activities that involve chemical reactions have been known and used for thousands of years, including burning fuels, smelting iron, creating glass and pottery, brewing beer, and producing wine and cheese. Numerous intricate processes that take place in all living systems, as well as the Earth's geology, atmosphere, and oceans, include chemical interactions.

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Answer:tells you the identity of the atom

Explanation:

number of protons=atomic number

Answer: C

Explanation: The answer would be C, it tells you the identity of the atom.

Physical change of a substance involves the change in phase or state. The physical change which is endothermic is, conversion of solid carbon to gaseous carbon.

Endothermic reactions are those which absorbs heat energy to give the products. Thus heat is taken into the reaction system hence the name endothermic.

In exothermic reactions, the heat energy is released by the reaction system, where the heat is exiting hence the name exothermic.

When solids changes to gaseous state, the tightly packed molecules in the solid state requires much energy to move apart and to overcome the intermolecular forces of attraction.

Liquid to gas does not require these much energy and gas to liquid evolves energy out.  Therefore, the physical change given here which is  endothermic is conversion of solid carbon dioxide to gas carbon dioxide.

Hence, option D is correct.

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2.83 lamda is the wavelength of a wave with a frequency of 105.7 x10^6 Hz in here.

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At STP, the volume of oxygen of mass 250g is found to be 175mL.

Volume is the amount of space occupied by an item or substance. Volume is a measurement of how much 3-dimensional space an object occupies. Volume is the measurement of a limited quantity of area at a specific end.

Mass is a measurement of the quantity of matter in an item or substance. Mass is the physical quantity that represents the amount of matter in an object's body. The amount of weight accommodated in an item or stuff is measured in mass.

Density - The amount of space taken up by an item or substance (its volume) in proportion to the amount of matter in that thing or substance (its mass).

Given:

Mass = 250g = 0.25kg

Density at STP = 1.4291g/L

To find:

Volume = ?

Formula:

Density = Mass / Volume

Calculations:

Volume = Mass / Density

Volume = 0.25 / 1.4291

Volume = 0.175L

Volume = 175mL

Result:

The volume of oxygen of mass 250g is found to be 175mL at STP.

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Calculate the mass, in amu, of 278 atoms of Li.

1) We need to find Li (Lithium) in the periodic table.

1) The atomic mass of Lithium is 6.94 u.

2) We can cancel some units and rearrange the equation.

3) Multiply the equation above by the number of atoms

The mass of 278 atoms of Lithium is 3.20*10^-21 u

The relative contribution of CO2 attributed to global warming is 60 % in the environment.

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Answer:

Barium sulfate, BaSO4, is made by reacting barium hydroxide and other barium sources with sulfuric acid and has a long history as a translucent white pigment.

The net ionic reaction equation for the change that happens when strong base is added to this buffer looks like this:

CH₃COOH(aq) + OH⁻(aq) → CH₃COO⁻(aq) + H₂O(l)

To solve this problem, we need to consider what will happen when a strong base is added to a buffer solution made from acetic acid and sodium acetate. All buffers have a basic and an acidic component. In this one the acidic component is, obviously, acetic acid, a weak acid.

When making a buffer based on a weak acid, the basic component is usually a salt of that acid, in this case, sodium acetate.

When a strong base is added to the buffer, it will dissociate to yield the metal cation and the OH⁻ anion. The basic OH⁻ anion will interact with the acidic component, neutralizing it and forming the acetate ion and water.

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Cellular respiration and photosynthesis similar is both processes break down glucose

Photosynthesis converts carbon dioxide and water into oxygen and glucose and glucose is used as food by the plant and oxygen in a byproduct whereas cellular respiration converts oxygen and glucose into water and carbon dioxide and both processes break down glucose and both are processes within the cell which make chemical energy available for life

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Each solution has a concentration of 7.625 x 103 m, 3.8125 x 104 m, and 1.90625 x 105 m, respectively.

Dilution is the process of lowering a sample's concentration by incorporating more solvent, according to its definition. The following is the dilution formula.

C₁V₁ = C₂V₂

where C1 is the sample's initial concentration.

V1 is the initial sample volume.

After dilution, the ultimate concentration is C2.

After dilution, the ultimate total volume is V2.

Calculate the concentration of the diluted solution by entering the numbers into the formula.

first common answer

C₁V₁ = C₂V₂

0. 1525 m(5.00 ml) = C₂(100.0 ml) (100.0 ml)

C₂ = 7.625 x 10⁻³ m

Second common solution

C₁V₁ = C₂V₂

7.625 x 10⁻³ m(5.00 ml) = C₂ (100.0 ml)

C₂ = 3.8125 x 10⁻⁴ m

Third accepted option

C₁V₁ = C₂V₂

3.8125 x 10⁻⁴ m(5.00 ml) = C₂(100.0 ml) (100.0 ml)

C₂ = 1.90625 x 10⁻⁵ m

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The correct answer is option C: Catalyst

A substance that helps a reaction to take place, but does not participate in the reaction is called a catalyst.

In Chemistry, a catalyst is defined as a substance that increases the rate of a chemical reaction without itself undergoing any changes. This process is called catalysis.

There are 3 different types of catalysts: enzymatic, homogeneous, and heterogeneous.

The catalytic substance remains unchanged and does not consume during the reaction, Their only job is to speed up the reaction by breaking bonds and saving time and energy.

For example, during the commercial preparation of ammonia also called the 'Haber process' iron is added as a catalyst to accelerate the reaction rate.

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The wavelength of these radio waves with a frequency 18GHz is equal to 0.0167m.

Microwave transmission is the method of transmission of information by electromagnetic waves that lie in the microwave range (1 m - 1 mm) of the electromagnetic spectrum. Microwave signals are limited to the line of sight, so long-distance transmission using these signals needs a series of repeaters to create a microwave relay network.

The relationship between wavelength (λ) and frequency (ν) can be expressed as follow:
λ = c/ν

Given, the frequency of the radio wave = 18GHz

The frequency in (per second) = 18 × 10⁹ s⁻¹

The wavelength of the radiowaves, λ = c/ν

where c is the speed of light and has a value of 3× 10⁸ m/s.

λ = c/ν = 3× 10⁸ m/s./ 18 × 10⁹ s⁻¹

λ = 0.0167 m

Therefore, the wavelength of these radio waves is equal to 0.0167m.

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Your question was incomplete, most probably the complete question was,

NASA communicates with the Space Shuttle and International Space Station using Ku-band microwave radio. Suppose NASA transmits a microwave signal to the Space Shuttle using radio waves with a frequency of 18GHz. Calculate the wavelength of these radio waves.

Be sure your answer has the correct number of significant digits.