A sample of a gas at 25°C has a volume of 150 mL when its pressure is 0.947 atm. What will the temperature of the gas be at a pressure of
0.987 atm and the volume changes to 144mL?
Be sure to show all of your work, define variables, show equation and substitute variables. Report you answer in Celcius.

Answer:

The final temperature of the water is 23.92°C.

Explanation:

Given that,

A heater in a hot water tank gives off 20,000 kJ per hour.  

For 1 hour or 60 minutes, heat is 20,000 kJ

For 90 minutes,

\(Q=\dfrac{20000}{60}\times 90\\Q=30000\ kJ\)

Mass, m = 450 kg or 450000 grams

Initial temperature, \(T_i=8^{\circ} C\)

We need to find the final temperature of the water. We know that the specific heat capacity of water is 4.186 J/g- °C

Heat is given by :

\(Q=mc\Delta T\\\\Q=mc(T_f-T_i)\\\\T_f=\dfrac{Q}{mc}+T_i\\\\T_f=\dfrac{30000\times 10^3}{450000\times 4.186}+8\\\\T_f=23.92^{\circ} C\)

Hence, the final temperature of the water is 23.92°C.

In order to determine the value of q in a reaction mixture with reactants and products each at a concentration of 0.5 M (molar concentration), we need additional information about the specific reaction and its equilibrium constant (K).

The value of q represents the reaction quotient, which is calculated similarly to the equilibrium constant (K) but using the concentrations of reactants and products at any given moment, rather than at equilibrium. The general formula for the reaction quotient is:

q = [C]^c [D]^d / [A]^a [B]^b.

Where [A], [B], [C], and [D] represent the molar concentrations of the reactants and products, and a, b, c, and d are the stoichiometric coefficients of the balanced chemical equation.

Without knowing the specific reaction and its equilibrium constant, it is not possible to determine the exact value of q.

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Svante Arrhenius theory suggests that in order for a substance to release either H+ or OH- ions, it must contain that particular ion. However, this does not explain the weak base ammonia (NH3), In Bronsted-Lowry acid-base theory, acids are defined as proton donors; whereas bases are defined as proton acceptors.

With the chemical formula NH3, ammonia is a nitrogen and hydrogen inorganic compound. Ammonia is a colorless gas with a strong, pungent odor.

It is a stable binary hydride and the most basic pnictogen hydride. In terms of biology, it is a typical nitrogenous waste, especially among aquatic organisms, and it significantly contributes to the nutritional requirements of terrestrial organisms by acting as a precursor to 45 percent of the world's food and fertilizers.

Approximately 70% of ammonia is used to create fertilizers, including urea and diammonium phosphate, in a variety of shapes and compositions. Additionally, pure ammonia is sprayed onto the ground.

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The element that can be found in both plays and stories is "characters."

Characters are an essential element of both plays and stories. They are the individuals or entities that drive the narrative, interact with each other, and contribute to the development of the plot. In plays, characters are typically portrayed by actors who perform their roles on stage, while in stories, characters are described and depicted through written words.

Characters can be central or supporting figures in a play or story, and they play a vital role in engaging the audience or readers. They have distinct personalities, motivations, and relationships that influence the events and conflicts within the narrative. Through their actions, dialogue, and character development, they contribute to the overall themes and messages conveyed by the play or story.

Whether it is a theatrical production or a written narrative, the presence and portrayal of characters are fundamental to creating engaging and compelling plays and stories.

Thus, the element that can be found in both plays and stories is "characters."

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Answer:

True

Explanation:

The greater the mass of the object, the greater its weight force will be.

Answer:

Physical properties

Atomic mass: 55.845

Density: 7.87 g/cm3

Group: Transition metals

Electrons: [Ar] 3d6 4s2

Melting point: 1811 K

Boiling point: 3134 K

Discovered: Ancient times

Explanation:

hope this helps! :D

Answer:

4.34 times 10^24

Explanation:

number of atoms=7.2 times Avogadro's number

                           =7.2 times 6.02 times 10^23

                           =4.34 times 10^24

Answer:

Explanation: we will multiple the amount of moles to the Avogadro's number for example:                                                                                                        

                                     7.2*6*10 to the power 23

The pH value of the solution which have a count of hydrogen ion [H⁺] of 0.57 is 0.244.

The pH ("potential of hydrogen" or "power of hydrogen") of a solution is essentially a measure of the concentration of hydrogen ions in a solution. In other terms, pH is a scale used to define the acidity or basicity of an aqueous solution. Acidic solutions with larger quantities of H+ ions have lower pH values than basic or alkaline solutions.

In the provided solution, the strong bases are totally ionised. As a result, the concentration of the hydroxide ion is the same as the concentration of the base. The hydroxide ion concentration in the mixture is equal to the sum of the base concentration divided by the entire volume.

we have value of [H⁺] is  0.57

so pH of the solution is

pH = -log [H⁺]

= - log(0.57)

= - (-0.244)

= 0.244

pH of the solution is 0.244.

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The molecular formula of the compound which has a molecular weight of 112.124 atomic mass units is C₆H₈O₂.

Molecular formula of any compound tells about the composition and numbers of each entities present in that molecule.

Steps involved in the prediction of molecular formula:

      Molar mass of C₃H₄O = 3(12) + 4(1) + 16 = 56

        112.124/56 = 2

        Molecular formula = (C₃H₄O)₂ = C₆H₈O₂

Hence correct option is (E).

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Answer:

d.

Explanation:

Answer:

D!

Explanation:

A is not true! When big meteors fall into the ocean, they cause mega-tsunamis I think, which does a lot of damage.

B, no, Uranus does too.

C, I think this is untrue, red wavelength and reflects the blue the blue!

D, is so true! A lot of reliable sources on this one!

Sorry if I did any wrong, I haven't learn chemistry in school yet.

The mass of the glass is 1 gram.

What is specific heat capacity?

 This refers to the amount of heat in joules (J) absorbed per unit mass (kg) of the material when its temperature rises 1 K (or 1 °C), and its units are J/(kg K) or J/(kg °C).

From the question:

cp= 0.20 cal/(g°C)

T = 150°C

heat added = 30 cal

To find the mass of the glass, you can use the formula:

mass = heat added / (specific heat capacity x temperature change)

Substituting the given values:

mass =           30 cal

              (0.20 cal/(g°C) x 150°C)

mass =             30

                 (0.20 x 150)

mass       = 30

                  30

mass = 1 g

Hence, the mass of the glass is 1 gram.

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1. The absolute error is 128.76 g

2. The relative error is 0.99

3. The percentage error is 99%

From the question given above, the following data were obtained:

Absolute error = |Accepted - Measured|

Absolute error = |130 - 1.24|

Absolute error = 128.76 g

Relative error = Absolute error / accepted value

Relaive error = 128.76 / 130

Relative error = 0.99

Percenrage error = relative error × 100

Percenrage error = 0.99 × 100

Percenrage error = 99%

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The velocity between point A and point B is 1.0 m/s

What is velocity?

Velocity is simply defined as the rate of change of displacement with time. Mathematically, it can be expressed as:

Velocity = Change of displacement / time

From the question given above, the following data were obtained:

The velocity between point A and point B can be obtained as follow:

Velocity = Change of displacement / time

Velocity = 8 / 8

Velocity = 1.0 m/s

Thus, the velocity between point A and point B is 1.0 m/s

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Answer:

Explanation:

16. 12

17. 8

18. 9

19. 10

20. 5

21. 15

22.8

23. 24

24. 12

25. 3 i guess( some one comment for 25th pls)

26. 2

Answer:

Carbon disulfide, CS2 , will have a total of 16 valence electrons, 4 from the carbon atom and 6 from each of the two sulfur atoms.

Explanation:

Your Welcome!

Answered By : TrinTrinPrinted!

The total electron pairs in the structure of Carbon disulfide (CS₂) is 8 electron pairs.

Electron pair is, two electrons occupying the same orbital in an atom or molecule.

CS₂ is Carbon disulfide, it will have a total of 16 valence electrons, 4 from the carbon atom and 6 from each of the two sulfur atoms.

The 16 valence electrons will form 8 electron pairs.

Thus, the total electron pairs in the structure of Carbon disulfide (CS₂) is 8 electron pairs.

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Answer:

Na2SO3 + H2O2 = Na2SO4 + H2O

Explanation:

Chemical reaction and equation.

Answer:

what to do in this question

First, separate them into homogenous units and then randomly select representative samples from each unit.

In order to sample a heterogenous population or material and we want the sample to be representative of the population or material:

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A real-life situation where multiplication and division of polynomials needs to be solved could be the following:

Tom is a carpenter and he needs to calculate the volume of a cuboid-shaped object he is constructing. The object has a length of 5x^2 + 6x - 2, a width of 3x - 2, and a height of 4x + 1. Tom needs to calculate the total volume of the object and rate his work with the rubric provided.

The volume of the object can be calculated by multiplying the length, width, and height together:

(5x^2 + 6x - 2)(3x - 2)(4x + 1)

The total volume can be simplified to 60x^3 + 4x^2 - 18x - 10. Tom can then use the rubric provided to rate his work.

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A crystal of halite weighing 5.73 g contains approximately 0.0981 moles of NaCl.

To calculate the number of moles of NaCl in a crystal of halite (table salt) weighing 5.73 g, you need to use the molar mass of NaCl. The molar mass of NaCl is 58.44 g/mol (22.99 g/mol for sodium + 35.45 g/mol for chlorine).

Calculate the moles of NaCl using the formula: Moles = Mass / Molar mass.

Moles = 5.73 g / 58.44 g/mol

          = 0.0981 mol (rounded to four decimal places).

Therefore, there are approximately 0.0981 moles of NaCl in a crystal of halite weighing 5.73 g.

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To measure the enthalpy of a given reaction and the reaction needs to be at atmospheric pressure so (C) coffee cup calorimetry is the best option.

A calorimeter that measures heat under constant pressure is called a coffee cup calorimeter. As a result, the heat detected by such a device is equal to the change in enthalpy. The use of a coffee cup calorimeter is typically reserved for the study of solution-based chemistry, which typically involves a reaction in which the volume is affected very little if any. So the best option is option (c) "coffee cup calorimetry" because the experiment is to be performed under atmospheric pressure which is constant.

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The change from graphite to diamond is a chemical change.

A chemical change involves the rearrangement of atoms in a substance. In other words, the "composition" of the substance changes when a chemical change takes place.

This is clearly seen when graphite changes to diamond. The arrangement of carbon atoms changes as reflected by the change in the density of graphite when it is converted to diamond.

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In their laboratory in Paris, Marie and Pierre Curie were able to successfully separate radioactive radium salts from the mineral pitchblende. In 1898, the Curies' study of pitchblende led to the discovery of the elements radium and polonium.

The majority of radium's functions have been replaced by those of other radioactive substances or radiation-emitting machinery. Radium is still utilized today, but, in a few different contexts, like industrial radiography.

Scientists and medical experts eventually understood that the ailments of these individuals were being brought on by internal contamination as from radium they swallowed. On watch and clock dials, radium was no longer utilized by the 1970s.

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The correct answer to the first part of your question is option (c): Energy is released by water vapor as it condenses.

When water vapor condenses into liquid water, it undergoes a phase change from a gaseous state to a liquid state. During this phase change, energy is released in the form of latent heat. This release of energy occurs because the water molecules in the vapor phase are more energetic and have higher kinetic energy compared to the water molecules in the liquid phase.

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acetic acid has a boiling point of 118oc. 391 K (118+273 = 391) is the boiling point of acetic acid in k.

Acetic acid, which has the molecular formula  \(CH_{3} COOH\), is also referred to as ethanoic acid, ethylic acid, vinegar acid, and methane carboxylic acid. As a byproduct of fermentation, acetic acid lends vinegar its distinctive smell. About 4-6% of the acetic acid in vinegar is water. In laboratories, more concentrated concentrations are often used, and glacial acetic acid is pure acetic acid with very little water present.

The 33rd most frequently manufactured chemical in the US is acetic acid. Acetic anhydride, cellulose acetate, vinyl acetate monomer, acetic esters, chloracetic acid, plastics, dyes, pesticides, photographic chemicals, and rubber are all products made with acetic acid. Other industrial applications include the production of organic chemicals, vitamins, antibiotics, hormones, and dietary additives. Acetic acid typically has amounts of 700 to 1,200 milligrams per kilogram (mg/kg) in wines, up to 860 mg/kg in aged cheeses, and 2.8 mg/kg in fresh orange juice when it is present naturally in food.

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B). The reagent that can be used to convert benzoic acid to benzoyl chloride is  SOCI2 (thionyl chloride). This reaction is called the Vilsmeier-Haack reaction.

The reaction involves the use of SOCI2 as a dehydrating agent, which converts the -COOH group of benzoic acid to -COCl (benzoyl chloride) by replacing the -OH group with a chlorine atom. This reaction occurs via a mechanism that involves the formation of an intermediate complex, which then breaks down to give benzoyl chloride. Option a (Cl/C14) is not a valid reagent for this reaction.  

The reaction proceeds through the formation of an intermediate that ultimately leads to the desired product. This conversion is an example of an acyl substitution reaction, specifically known as the "acyl chloride formation" in organic chemistry. It is essential to note that the other reagents listed (Cl/C14, SOCI, CHICI, AICI) are not suitable for this specific transformation.

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The moles of H2 are contained in a balloon that contains hydrogen and water vapor, has a volume of 28.3 cm3 at 25.0oc and a total pressure of 1.001 atm is 7.28 moles.

Pressure is defined as the tension at a point inside a confined fluid, or the perpendicular force per unit area. The physical amount of force applied to a certain region is known as pressure.

Given

P = 1.001 atm

V = 28.3 cm³

T = 25 °C

R = 8.31 jK⁻¹mol⁻¹

PV = nRT

n = RT / PV

n = 8.31 x 25 / 1.001 x 28.3

n = 7.28 moles

Thus, the moles of H2 are contained in a balloon that contains hydrogen and water vapor, has a volume of 28.3 cm3 at 25.0oc and a total pressure of 1.001 atm is 7.28 moles.

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