please help me with this problem

Answer:

P₂ = 46.3 KPa

Explanation:

Given data:

Initial pressure = 54.5 KPa

Initial temperature = 19.0 °C (19+273 = 292 K)

New pressure = ?

Final temperature = -25°C (-25+273 =248 K)

Solution:

According to Gay-Lussac Law,

The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.

Mathematical relationship:

P₁/T₁ = P₂/T₂

Now we will put the values in formula:

13.0 atm / 293 K = P₂/375 K

P₂ = 54.5 kpa × 248 K / 292 K

P₂ = 13516 KPa. K /292 K

P₂ = 46.3 KPa

Answer: C. 3, 1, 4, 2

Explanation:

Got It Right On Edge

Answer:

C

Explanation:

A solution is made by mixing 114.g of benzene C6H6 and 83.g of acetyl bromide CH3COBr, the mole fraction of benzene in this solution is 1.45mol.

The term molar mass is defined as the compound is often calculated by adding the quality atomic masses in g/mol of the constituent atoms.

Molar mass of CH3COBr,

Molar Mass = 2 × MM(C) + 3 × MM(H) + 1 × MM(O) + 1 × MM(Br)

= 122.944 g/mol

Molar mass of C6H6,

MM = 6 × MM(C) + 6 × MM(H)

= 6 × 12.01 + 6 × 1.008

= 78.108 g/mol

n(CH3COBr) = mass/molar mass

= 83 /122.944

= 0.675

n(C6H6) = mass/molar mass

= 114 / 78.108

= 1.45

n(CH3COBr),n1 = 0. 675mol

n(C6H6),n2 = 1. 45mol

Thus, the mole fraction of benzene in this solution is 1.45mol.

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When a molecule lacks polar bonds, there is no permanent charge difference between parts of the molecule, and the molecule is nonpolar.

Because the electron charge on both atoms is identical, the Cl2 molecule has no polar bonds. As a result, it is a nonpolar molecule. Hydrocarbons are nonpolar molecular substances because none of the bonds in hydrocarbon molecules, such as hexane, C6H14, are significantly polar.

The molecule is nonpolar if the arrangement is symmetrical and the arrows are of equal length. The molecule is polar if the arrows are of different lengths and do not balance each other. The molecule is polar if the arrangement is asymmetrical.

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Answer: No, the speed of propagation is constant in a given medium; only the wavelength changes as the frequency changes.

Explanation:

Protein, peptide and amine-based hormones have amino acids in common. Amino acids are the building blocks of protein. The synthesis of these hormones takes place in the endocrine glands which are responsible for producing and releasing hormones into the bloodstream.

The amino acids which make up these hormones, are linked together to form a long chain of amino acids, which can be broken down into smaller peptides. These peptides are then modified in various ways to produce the final hormone. The modification can include the addition of carbohydrates, lipids, and other molecules.

The hormones are then transported through the bloodstream to their target cells where they bind to specific receptors on the surface of the cell. Once bound, the hormone can either activate or inhibit certain cellular functions which results in a specific physiological response.In conclusion, the correct answer is that protein-, peptide-, and amine-based hormones have amino acids in common.

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This is due to Avogadro's law, which states that equal volumes of gases at the same temperature and pressure contain an equal number of molecules.

This relationship holds true because equal volumes of gases contain an equal number of molecules when other conditions are constant.

According to Avogadro's law, which states that equal volumes of gases at the same temperature and pressure contain an equal number of molecules,

we can determine the relationship between the number of molecules and the volume of hydrogen and oxygen gases.

The equation V / n = k represents Avogadro's law, where V is the volume, n is the number of moles, and k is a constant.

Since both hydrogen (H₂) and oxygen (O₂) gases are at the same temperature and pressure, their volumes will be directly proportional to the number of molecules present.

Therefore, the ratio of the number of molecules of hydrogen gas (2 liters) to the number of molecules of oxygen gas (2 liters) will be equal to the ratio of the volumes occupied by these gases.

Since the volumes are equal, the number of molecules of hydrogen gas will indeed be twice the number of molecules of oxygen gas.

In summary, based on Avogadro's law, the number of molecules in 2 liters of hydrogen gas will be twice the number of molecules in 2 liters of oxygen gas, given that they are at the same temperature and pressure.

This relationship holds true because equal volumes of gases contain an equal number of molecules when other conditions are constant.

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Emerging scientific ideas are new theories or ideas that are gaining attention in the scientific community, but have not yet been fully accepted or confirmed.

Emerging ideas refer to the new and innovative ideas or theories that have yet to gain full scientific acceptance. While a scientific consensus is a view or theory that has been universally accepted and confirmed by multiple experiments or research, an emerging scientific idea is a new and unproven theory or idea that is gaining attention in the scientific community. These emerging ideas may also be referred to as scientific hypotheses. In contrast to scientific consensus, emerging scientific ideas have not yet been subjected to rigorous testing and confirmation.

They are generally proposed to explain new observations or experimental results, which have not yet been fully understood or explained by established scientific theories. Emerging scientific ideas can have the potential to challenge the current scientific consensus. If an emerging scientific idea is found to be valid, it can ultimately lead to the establishment of a new scientific consensus. For example, the emerging scientific idea of the Higgs boson particle led to the discovery of a new field in particle physics, which is now an established scientific consensus.

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The speed of sound in substances is ranked in this order: 25°Cair, 50°C air, water and steel

Matter is anything that has mass and can occupy space. Matter can be classified into three, solid liquid and gas. In the substance named in the question, steel is solid, air is gas and water is liquid.

The speed of sound varies in matter. For example Sound travels fastest through solids. This is because molecules in a solid medium are much closer together than those in a liquid or gas, allowing sound waves to travel more quickly through it. In fact, sound waves travel over 17 times faster through steel than through air. Due to the closeness of the particle of steel sound travels in it fastest to water and air. The compatibility of the molecule of water is greater than that of air. However, sound travels faster in hot air than cold air.

This means in the order of slowest to fastest it will be ; 25°Cair, 50°C air ,25°C water and steel.

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Answer:

B: nuclear energy.

Explanation:

It is emission-free and it saves 2.4 billion tons of carbon emissions per year. Also, the level of hazard of nuclear waste does decrease during the time.

Hope that helps!

Answer:

the answer is (a)true.

Answer (s) true.

Explanation: Natural science can be divided into two main branches: life science and physical science. Life science is alternatively known as biology, and physical science is subdivided into branches: physics, chemistry, astronomy and Earth science.

Answer: lightbulb, lamp, nightlight

Explanation:

The boiling point of a substance is directly proportional to the strength of its intermolecular forces.

Stronger intermolecular forces indicate a higher boiling point. Intermolecular forces are the forces between molecules that keep them together in a liquid or solid state. The strength of intermolecular forces is determined by the type of molecules and the number of electrons they possess.

                                          The boiling point of a substance is the temperature at which it changes from a liquid to a gas state. When the temperature rises, the kinetic energy of the molecules increases, causing them to move faster and more freely. When the temperature reaches the boiling point, the kinetic energy of the molecules is sufficient to overcome the intermolecular forces holding the molecules together in the liquid state and move apart, forming a gas state.

                                      Stronger intermolecular forces require more energy to overcome them, so they result in a higher boiling point. Conversely, weaker intermolecular forces result in a lower boiling point for the substance. In short, the stronger the intermolecular forces the higher the boiling point.

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An average quality lawn can capture approximately 4 times the carbon output of a typical gasoline-powered mower. This calculation takes into account the process of photosynthesis, where plants absorb carbon dioxide (CO2) from the atmosphere and convert it into oxygen (O2) and organic compounds through the use of sunlight.

During photosynthesis, plants take in CO2 and release O2, effectively reducing the amount of CO2 in the atmosphere. This carbon capture process is vital for mitigating climate change and reducing greenhouse gas emissions. Lawns, being comprised of grass and other vegetation, contribute to this carbon capture.

On the other hand, a typical gasoline-powered mower emits CO2 as a byproduct of combustion. The emissions from the mower add to the overall carbon footprint associated with lawn maintenance.

By comparing the carbon capture capacity of an average quality lawn to the carbon emissions of a typical gasoline-powered mower, it is estimated that the lawn can capture approximately 4 times the amount of carbon emitted by the mower. This estimate emphasizes the importance of maintaining and promoting healthy lawns as a means to counteract carbon emissions and contribute to environmental sustainability.

In conclusion, an average quality lawn can capture around 8 times the carbon output of a typical gasoline-powered mower, primarily through the process of photosynthesis.

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Hydrogen breaks down relatively fast in the atmosphere. In the presence of sunlight, hydrogen breaks down within a few years. However, in the absence of sunlight, it can take up to a decade (10 years) for hydrogen to break down in the atmosphere.

Hydrogen is the first element in the periodic table with the symbol H. It is the most abundant element in the universe, but it is rarely found in its elemental form on Earth. It is often found combined with other elements such as oxygen and carbon. Hydrogen is a colorless, odorless, and highly flammable gas. It is used in a variety of applications, such as fuel for vehicles, electricity production, and chemical manufacturing.

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The root-mean-square (rms) speed of the molecules of a sample of N2 gas at a temperature of 32.9° C is approximately 448 m/s.

The root-mean-square speed (rms) of molecules in a sample of diatomic nitrogen (N2) gas at a temperature of 32.9° C is given as follows.

The formula for the rms speed of gas molecules is:

vrms = √3kT/m

Boltzmann's constant, denoted as k, has a value of 1.38 × 10−23 J/K.

T is the temperature in Kelvin, and

The mass of the gas molecules is represented by the variable m.

The root mean square (rms) speed of the gas molecules is denoted as v.

Using the provided values of the temperature, the molecular mass of nitrogen, and Boltzmann's constant, we have the following:

Temperature of N2 gas,

The temperature T, originally measured at 32.9°C, can be converted to 305.9 K by adding 273 to the Celsius value.

Mass of N2 molecules, m = 28 × 10−3 kg/mol

Using these values, we can now calculate the rms speed of the N2 molecules in the gas sample:

rms speed,

v = √3kT/m

= √(3 × 1.38 × 10−23 × 305.9)/(28 × 10−3)

= 448 m/s (approx.)

Therefore, the root-mean-square speed of the molecules of a sample of N2 gas at a temperature of 32.9° C is approximately 448 m/s.

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Approximately 222.4 grams of oxygen reacted in the combustion process. To determine the amount of oxygen that reacted, we can use the balanced chemical equation for the combustion of hydrogen:

2H₂ + O₂ → 2H₂O

From the equation, we can see that 1 mole of oxygen reacts with 2 moles of hydrogen to produce 2 moles of water.

First, we need to convert the given masses of hydrogen and water into moles using their molar masses:

Molar mass of hydrogen (H₂) = 2 g/mol

Molar mass of water (H₂O) = 18 g/mol

Mass of hydrogen in moles = 27.8 g / 2 g/mol = 13.9 mol

Mass of water in moles = 249 g / 18 g/mol = 13.8 mol

Since the stoichiometry of the reaction tells us that 2 moles of hydrogen react with 1 mole of oxygen, we can calculate the moles of oxygen consumed as:

Moles of oxygen consumed = 13.9 mol / 2 = 6.95 mol

Finally, we can convert the moles of oxygen to grams using its molar mass:

Molar mass of oxygen (O₂) = 32 g/mol

Mass of oxygen consumed = 6.95 mol × 32 g/mol = 222.4 g

Therefore, approximately 222.4 grams of oxygen reacted in the combustion process.

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Answer: decomposing biomass

The number of c70 molecules that can be made from one mole of carbon atoms would be 42.14 × 10²³ molecules.

According to standards, 1 mole of any substance contains 6.02 × 10²³ molecules of the substance.

C70 is an allotope of carbon that contains 70 atoms in a single molecule of its atom.

If 1 mole of carbon contains 6.02 × 10²³ molecules by standard, then the number of C70 molecules that can be made from 1 mole of carbon atoms would be:

6.02 × 10²³ x 7 = 42.14 × 10²³ molecules

In other words, the number of C70 molecules that can be made from one mole of carbon atom would be 42.14 × 10²³ molecules.

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The difference between 8.1456 - 5.12 will be 3.0256 and rounding it off will give 3.

It should be noted that the information given is that we should subtract 5.12 from 8.1456.

It should be noted that subtraction is used when we want to deduct a number from another number. It is taking away a number form another one.

In this case, we will take away 5.12 from 8.1456. This will give the difference between the numbers.

Therefore, 8.1456 - 5.12 = 3.0256

Therefore, the difference is 3.0256 and rounding it appropriately will give a value of 3.

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A carbon-carbon bond has an average bond dissociation energy of 410 kj/mol. The energy of UV radiation at wavelength 292 in nanometers is 410 kj/mol.

The wavelength of a wave is the separation between its two crests or troughs. In the direction of the wave is measured.

The wavelength of a wave is the distance it travels between its crests and troughs (which may be an electromagnetic wave, a sound wave, or the any other wave). The peak of a wave is at its crest, and its trough is at its top. It is given in length units like meters, centimeters, millimeters, and nanometers because wavelength is a measurement of both length and distance.

Light's wavelength changes with color, meaning that it differs for each hue. Violet has the shortest wavelength while red has longest. Compared to violet light, UV radiation has a shorter wavelength. In a similar vein, infrared energy has a larger wavelength than red light.

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Answer:

1.10 g/mL

Explanation:

The amount of volume an object displaces is the amount of volume that object takes up.

7.87 - 1.67 = 6.2

The object has a volume of 6.2 mL.

You have the mass (6.82 g) and the volume (6.2 mL).  Divide the two value to find the density.

(6.82 g)/(6.2 mL) = 1.10 g/mL

The density of the object is 1.10 g/mL.

Answer:

For example, the sugar found in milk is called lactose. With the aid of the enzyme, lactase, the substrate, lactose, is broken down into two products, glucose and galactose. People who don't make enough lactase have trouble digesting milk products and are lactose intolerant.

Answer:

it's the United states

Explanation:

because It has alot of tornadoes

Answer: 1) The answer is: c) protons and neutrons.

2) The answer is: a) electrons.

Explanation:

To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. Therefore, Much of the mass of an atom is concentrated in its nucleus. The nucleus contains  protons and neutrons and the outer part of the atom contains  electrons.

Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit. Electron has -1 charge while proton has +1 charge. Neutron is neutral.

Much of the mass of an atom is concentrated in its nucleus. The nucleus contains  protons and neutrons and the outer part of the atom contains  electrons.

Therefore, much of the mass of an atom is concentrated in its nucleus. The nucleus contains  protons and neutrons and the outer part of the atom contains  electrons.

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There is great relationship between the SI unit for volume and length because the base unit is same.

The base units of length and volume are linked to each other in the metric system because the unit of volume is cubic meters while on the other hand, the unit of length is meter. The unit of volume is three times of the unit of length. There is direct relationship between volume and length due to the similar of their base units. So volume and length are related to each other.

So we can conclude that there is great relationship between the SI unit for volume and length because the base unit is same.

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Answer:

Percent composition of O is 48g80g×100%=60%

In the compound iodine heptafluoride: (hints: write out the molecular formula of this compound before answering the question. Also be sure you clearly understand the concepts of charge, oxidation numbers, how to determine charge and oxidation numbers, and - most important of all! - the similarities and the differences between charges and oxidation numbers)

Each fluorine atom has a charge of 1

The interhalogen compound iodine heptafluoride, often known as iodine(VII) fluoride or iodine fluoride, has the chemical formula IF7.   As anticipated by VSEPR theory, it exhibits a unique pentagonal bipyramidal structure.  The molecule is capable of undergoing the Bartell process, a pseudorotational rearrangement that is similar to the Berry mechanism but for a heptacoordinated system.  It produces colorless crystals that melt at 4.5 °C and have a very narrow liquid range with a boiling point of 4.77 °C. The dense mist has an unpleasant, musty smell. The molecule is symmetrical with D5h. suggestion

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Answer:

choice D. Ionic, because valence electrons are transferred.

Explanation: