A 634. 5 g sample of helium absorbs 125. 7 calories of heat. The specific heat capacity of helium is 1. 241 cal/(g·°C). By how much did the temperature of this sample change, in degrees Celsius?

Answer:

Explanation:

Here, we want to calculate the initial volume of the container

Mathematically, we know that volume and pressure are inversely related. What this means is that as volume increases, pressure is expected to decrease and as pressure increases, volume is expected to decrease

A mathematical link between these two is as follows:

The above is according to Boyles' law.

The values with subscript 1 are the initial values, while the values with the subscript 2 are the final values

Thus:

V1 = ?

P1 = 1.25 atm

V2 = 1L

P2 = 3.75 atm

From the relation:

Answer:

144.7 g/mol would be the molar mass of the monoprotic acid

Explanation:

We can find the molar mass of the monoprotic acid from the data showed in the excersie. As every titration we can say that:

mEq acid = mEq base

mEq acid = 14.6 mL . 0.426 M

mEq acid = 6.2196 mEq

mEq = Volume (mL) . N = mass (g) / (EQ / 1000), where the EQ is the:

Molar weight / valence. For this case, as the acid is a monoprotic one, we assume Molar Weight = EQ

6.2196 mEq = 0.9 g / (EQ / 1000)

6.2196 mEq . EQ/1000 = 0.9 g

EQ = 0.9 g / 6.2196×10⁻³ = 144.7 g/mol

Spectral absorption and emission lines are important tools used to determine the composition of a gas. When light passes through a gas, certain wavelengths are absorbed by the gas particles. This results in dark absorption lines in the spectrum.

Each element and molecule has its unique absorption lines, allowing us to identify the composition of the gas based on the presence and position of these lines.
On the other hand, when a gas is excited, it emits light at specific wavelengths, resulting in bright emission lines in the spectrum. Similar to absorption lines, emission lines are also characteristic of specific elements and molecules. By analyzing the positions and intensities of these lines, we can determine the composition of the gas.
Spectral absorption and emission lines provide a fingerprint for each gas, enabling scientists to identify the elements and molecules present. This information is valuable in various fields, such as astronomy, chemistry, and environmental science. By studying these lines, we can gain insights into the chemical makeup of gases, helping us understand their properties and behavior.

To know more about Spectral absorption visit:

https://brainly.com/question/31818734

#SPJ11

Answer: C

Explanation:

Reaction 1 starts off with one mole of reactant and produces 2 moles of product. The increase in the number of moles, along with the fact that aqueous compounds are more disordered than solid compounds, increases the disorder and thus entropy.

Reaction 2 starts off with 1 mole of solid and produces 1 mole of solid and one mole of gas. The increase in the number of moles, along with the fact that gases are more free and disordered than solids, increases the disorder and thus entropy.

The molecular formula of a compound refers to the actual number of atoms of each element present in a molecule of that compound. The empirical formula, on the other hand, provides the simplest whole-number ratio of atoms in a compound. In this case, the empirical formula of the compound is C3H5O2. To determine the molecular formula, we need to know the molar mass of the compound.

We can calculate the molecular formula by finding the ratio of the molar mass of the compound to the molar mass of the empirical formula. The molar mass of the empirical formula C3H5O2 is:

(3 x 12.01 g/mol for C) + (5 x 1.01 g/mol for H) + (2 x 16.00 g/mol for O) = 73.08 g/mol

To find the molecular formula, we divide the molar mass of the compound (146 g/mol) by the molar mass of the empirical formula (73.08 g/mol):

146 g/mol ÷ 73.08 g/mol = 2

This tells us that the compound has two times the number of atoms in the empirical formula. Therefore, the molecular formula of the compound is:

(C3H5O2)2 = C6H10O4

So, the molecular formula of the compound with a molar mass of 146 g/mol and an empirical formula of C3H5O2 is C6H10O4.

Learn more about empirical formula here:

https://brainly.com/question/14044066

#SPJ11

The volume of the gas in a sealed container would be decreased at constant pressure: C. by raising the temperature.

Charles law states that when the pressure of an ideal gas is kept constant, the volume of a gas is directly proportional to the absolute temperature of the gas.

This ultimately implies that, the volume of a gas decreases at constant pressure when its temperature is decreased and vice-versa.

In conclusion, we can infer and logically deduce that the volume of the gas in a sealed container would be decreased at constant pressure by raising the temperature in accordance with Charles law.

Read more on Charles law here: https://brainly.com/question/888898

#SPJ1

Answer:

Hydrologists study how water interacts with the earth's crust. For example, they may study how rainfall and snowfall cause erosion, create caves, percolate through soil and rock to become groundwater, or eventually reach the sea.Hydrologists strive to improve water quality and increase our access to water so that we can continue to make use of it in all the ways that are necessary to our lives. A hydrologist measures the stream flow in a tributary to the Coeur d'Alene River. layers of gases surrounding a planet or other celestial body

The full electron configuration for the S⁻² ion is 1s² 2s² 2p⁶ 3s² 3p⁶. This electron configuration represents the sulfur ion (S) with a charge of -2.

To identify the noble gas with the same electron configuration, we can look for the noble gas that comes before sulfur in the periodic table.

In this case, the noble gas that matches the electron configuration is argon (Ar).

The electron configuration of argon is 1s² 2s² 2p⁶ 3s² 3p⁶. If we compare the electron configurations of S⁻² and argon, we can see that they are identical.

This is because noble gases, such as argon, have completely filled electron shells. They possess stable electronic configurations, making them chemically unreactive.

The noble gas configuration is often used to represent the core electrons of an element or ion, as it simplifies the electron configuration notation.

In conclusion, the noble gas with the same electron configuration as the S^2- ion (1s^2 2s^2 2p^6 3s^2 3p^6) is argon (Ar).

To know more about  noble gas visit:

https://brainly.com/question/1984010

#SPJ11

Quadratic equation is a polynomial equation of the second degree.

The term quadratic equation refers to an equation of the type ax^2 + bx +c. It is a polynomial of degree 2. The highest power of x therein is only 2.

The question is incomplete hence we can't really tell which of the  pair of functions in which the exponential is consistently growing at a faster rate than the quadratic over the interval.

Learn more about quadratic equation: https://brainly.com/question/2263981

Answer:C

Explanation:

Answer:

C

Explanation:

The percent composition of an atom in a molecule gives information regarding the relative amount of mass an atom contributes to a molecule.

Answer:

An exothermic reaction is a chemical reaction in which energy is given out to the surroundings in the form of heat or light or even sound.

Other explanations are given below.

Explanation:

An exothermic reaction is a chemical reaction in which energy is given out to the surroundings in the form of heat or light or even sound. In exothermic reactions, the energy content of the products are lower than that of the reactants and this excess energy is therefore released as the reaction proceeds towards formation of products.

Combustion of fuel is an exothermic reaction because the process involves the  release of energy in the form of heat and light to the surroundings as the reactants (usually a fuel and oxygen) which are at a higher energy state combine to give the products which are at a lower energy state (usually CO₂ and water).

An example of a fuel is the gas propane found in cooking gas. It combines with oxygen found in air to produce the heat that is used to cook our foods.

Other examples of exothermic reactions include

1.Lighting firewood: In this process, wood which is a mixture of gaseous fuels like methane and solid fuel like charcoal combine with oxygen found in air to produce carbon (iv) oxide and water vapor while releasing heating the process.

2. Lighting a match: The head of safety matches are made of potassium chlorate, mixed with sulfur, fillers and glass powder.  The side of the box contains red phosphorus, binder and powdered glass. When the match is struck, the friction generates heat which causes a small amount of red phosphorus to be converted to white phosphorus, which then ignites spontaneously in air.  The heat produced initiates the decomposition of potassium chlorate to give oxygen and potassium chloride.  The sulfur catches fire and ignites the wood which also burns in the air to release carbon (iv) oxide an water.

3. Burning of coal: Coal is solid carbon which combines with oxygen in air when ignited to produce carbon (iv) oxide and water vapor while also releasing heat and light energy.

Answer:

genes I believe???? like genes transmitted from past relatives

The number of particles of water you drink if you drink 64 oz., or 1893 grams, of water in a day is 6.32 x 10²⁵ particles.

In order to determine how many particles of water you consume if you drink 64 oz of water in a day, we need to convert the given mass of water to moles.

Mass of water = 1893 g

Molar mass of water (H₂O) = 18.0 g/mol

Number of moles of water = mass / molar mass = 1893 g / 18.0 g/mol = 105 mol

Now, we can use Avogadro's number (6.02 x 10²³ particles/mol) to determine the number of particles:

Particles of water = number of moles x Avogadro's number = 105 mol x 6.02 x 10²³ particles/mol = 6.32 x 10²⁵ particles

Therefore, if you drink 64 oz or 1893 grams of water in a day, you would consume approximately 6.32 x 10²⁵ particles of water.

Learn more about Avogadro's number here: https://brainly.com/question/30340398

#SPJ11

To prevent mixing up, the food worker must carefully mark the spray bottle with what is inside to assure that accident hapen.

Since chemicals are dangerous, it is best top store them in their own special location and to stay away from sanitizing chemicals when preparing food to prevent contamination.

Chemicals labels must be included on all substances that are poisonous, oxidizing, corrosive, reactive, carcinogenic, or flammable, as well as any liquids or gases that are under pressure, such as liquid nitrogen tanks and compressed air cylinders.

Chemicals should also never be kept close to food or surfaces that come into contact with it. To prevent cross-contamination, the chemical storage space for food workers needs to be isolated from the food storage area. Chemical spills into food are relatively simple to happen if they are stored close to locations where food is prepared.

Learn more about chemical storage here https://brainly.com/question/8038400

#SPJ4

Answer:

Fisica, Astronomia, Biologia

Explanation:

con esta relacion entre ellas se puede explicar y comprender fénomenos de la naturaleza.

Answer:

8.677

⋅

10

8

g

Explanation:

Answer:

0.326 mol. is the answer.

Explanation:

No. of moles = Volume (L) / Volume at STP

N = 7.3 / 22.4

N = 0.326 moles

Answer:

8

Explanation:

trust

Answer:

a) 1.6

f)7.51

b)3.9

g)9.2

c)3.1

h)41.9

d)1.959

i)0.29

e)5.2

j)1.112

Explanation:

When you are multiplying or dividing the numbers you take the least amount of significant figures and that's how many significant figures your answer will be. Instead of being a super long answer. Hope this helps. Also, sorry it took me a hot minute :)

The Ksp of NaCl when it begins to crystallize out of a solution is 21.34.

To determine the Ksp of NaCl we need to consider the solubility product constant (Ksp) expression for the dissociation of NaCl in water:

NaCl(s) ↔ Na⁺(aq) + Cl⁻(aq)

The Ksp expression for NaCl is given by:
Ksp = [Na⁺][Cl⁻]

Since NaCl has a 1:1 stoichiometry, both the concentrations of Na⁺ and Cl⁻ ions are equal, which is 4.62 M.

Therefore, the Ksp can be calculated as:
Ksp = (4.62)(4.62)
Ksp = 21.3444

So, the Ksp for NaCl at the point where it begins to crystallize out of solution with a concentration of 4.62 M is 21.34.

To learn more about Ksp visit:

https://brainly.com/question/1419865

#SPJ11

Answer:

96 g/mol.

Explanation:

As a result, as shown below, the molecular weight of sulfate SO4 can be easily calculated.

=(S) + 4(O)\s

= (32) + 4(16)\s

= 32 + 64.\s

= 96.

As a result, the molecular mass of sulfuric acid SO4 is 96 g/mol.

Answer:

Below

Explanation:

Use your Periodic Table of Elements

  sulfur = 32.06 gm  molar mass

  oxygen= 15.999  gm   ( and there is FOUR of these)

       total = 96.056 gm  molar mass for SO4

Answer:

Refraction of waves involves a change in the direction of waves as they pass from one medium to another.

Explanation:

Refraction, or the bending of the path of the waves, is accompanied by a change in speed and wavelength of the waves.

Synthesis reaction

It is a reaction in which 2 or more reactants combine with each other to form one product .

Check option C

Sulphate and water are combining to form sulfuric acid .

Hence option C is correct

Answer:

SO3 + H2O => H2SO4

Explanation:

I took the test :)

The frequency of a wave with a wavelength of 6.0 x 10-⁷m is 5.0 × 10¹⁴Hz.

The frequency of a wave can be calculated by dividing the wavelength by its wavelength as follows:

f = v/λ

Where;

According to this question, a wave has a wavelength of 6.0 x 10-⁷m. The frequency can be calculated as follows:

f = 3 × 10⁸ ÷ 6.0 × 10-⁷

f = 5.0 × 10¹⁴Hz

Therefore, the frequency of a wave with a wavelength of 6.0 x 10-⁷m is 5.0 × 10¹⁴Hz.

Learn more about frequency at: https://brainly.com/question/14316711

#SPJ1

The big bang is characterized by an expanding universe.

The scientists hold the theory that the universe is the result of a massive explosion that marked the beginning of the universe. Since the big bang, matter has been spreading.

Hence, one thing that has become associated with the big bang is the idea of an expanding universe.

Learn more about the universe:https://brainly.com/question/9724831

Answer: I think you're supposed to add the protons and neutrons and then that's your answer. Sorry if I'm wrong :/

Explanation:

Answer: A The Triangle Fire was a tragedy that could have been prevented.

Explanation:

The Triangle Fire was a tragedy that happened in the factory of Shirtwaist Company in New York City where there was.a.fore outbreak and about 145 employees of the company were killed.

The deaths could have been prevented because the company neglected safety measures such as having a good and reliable pump system, having readily available fire extinguishers. Also, what resulted in the lethal nature of the incident was because the doors within the building of the factory were locked.

The tragedy generated lots of attention and series of laws were been out in place in order to ensure that workers are safe at their workplace.