Rounding this to one decimal place gives 299.5 cal/g ≈ 0.3 cal/g, which is likely why 0.3 was given as the answer.
What is Energy?
Energy is a property of objects or systems that can be transferred to other objects or systems, or converted into different forms. It is a scalar physical quantity that can be defined as the ability to do work or produce heat. Energy exists in many forms, such as mechanical, thermal, electrical, chemical, nuclear, and electromagnetic, and can be transformed from one form to another. The SI unit of energy is the joule (J), but other units such as the calorie (cal) or the electronvolt (eV) are also commonly used in different contexts.
To convert the energy from joules per gram to calories per gram, we can use the conversion factor 1 calorie = 4.184 joules.
Thus, to find the energy of the snack in Calories/gram, we can divide the energy in joules/gram by the conversion factor:
1,254 J/g ÷ 4.184 J/cal = 299.5 cal/g
Rounding this to one decimal place gives 299.5 cal/g ≈ 0.3 cal/g, which is likely why 0.3 was given as the answer.
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how to convert mol to vol
In order to convert mol to vol, you need to know the molar mass of the substance, as well as its density. You can use the following formula:
Volume = (Number of moles x Molar mass) / Density
Conversion of Moles to VolumeMoles and volume are two common measurements used in chemistry. Moles, which represent the amount of a substance, are often used to quantify the number of particles (atoms, molecules, or ions) in a given sample. Volume, on the other hand, refers to the amount of space occupied by a substance.
To convert moles to volume, one must understand the relationship between molar mass, density, and volume. Molar mass is the mass of one mole of a substance and is typically measured in grams per mole (g/mol). Density is the mass of a substance per unit volume, usually measured in grams per cubic centimeter (g/cm³).
By using the formula vol = (mol x Molar mass) / Density, one can convert moles to volume. This formula takes into account the molar mass of the substance and its density to determine the volume occupied by a certain number of moles. Understanding this relationship is essential in many chemistry applications, such as calculating the amount of a chemical needed to make a certain volume of solution or determining the volume of gas produced in a chemical reaction.
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what is the half-life of a radioactive isotope?a.
A radionuclide's half-life is the amount of time it takes for half of its radioactive atoms to decay.
Because some atomic nuclei contain excess nuclear charge that makes them unstable, these nuclei undergo radioactive decay to transform into stable nuclei. These substances are known as radioactive substances.
Any of multiple species of the same chemical element with differing masses whose nuclei are unstable and spontaneously produce radiation in the form of alpha, beta, and gamma rays are known as radioactive isotopes, also known as radioisotopes, radionuclides, or radioactive nuclides.
The half-life of carbon-14 is 5,730 years. 5,730 years after the organism perished, just half of the original carbon-14 isotope will be present in the fossil.
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the reaction of benzaldehyde with acetone and sodium hydroxide produces____
The reaction of benzaldehyde with acetone and sodium hydroxide produces an organic compound, known as dibenzylideneacetone (DBA).
Dibenzylideneacetone (DBA) is an organic compound with chemical formula C17H14O. It is a yellow crystalline solid that is commonly used in organic chemistry as a ligand or a precursor to various ligands. It has a distinctive structure consisting of two phenyl rings and a carbonyl group conjugated to an alkene, giving rise to a system of alternating double bonds that contribute to its unique properties. It is also known for its use in organic solar cells and as a photosensitizer in polymer chemistry.
The reaction of benzaldehyde with acetone and sodium hydroxide is a type of aldol condensation reaction, which results in the formation of dibenzylideneacetone (DBA). The reaction proceeds through a series of steps, including the formation of an enolate intermediate from the acetone and the deprotonation of the benzaldehyde by the hydroxide ion.
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6. Energy generated from
nuclear fusion in the sun's core is what causes
the sun to "shine" and radiate energy through
the solar system. In fusion, four hydrogen
atoms fuse together to become one helium
atom. The atomic mass of hydrogen is 1.00794
and the atomic mass of helium is 4.0026.
How does the difference in the mass of four
hydrogen atoms and one helium atom help
explain the energy released by the sun?
The atomic mass is 2.775 are released by the sun.
What is mass ?
The amount of matter in a body is referred to as its mass. The kilograms is the kilograms, which is the SI unit of mass (kg). Mass is defined as: Mass = Density /Volume.
What is atom ?
The smallest unit of matter that can participate in a chemical reaction is an atom. Electron, proton, and neutrons make up an atom. Atoms are incapable of existing alone.
Therefore, atomic mass is 2.775 are released by the sun.
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If the molecular mass of a carbon atom is 12, the mass of a hydrogen atom is 1, and the mass of an oxygen atom is 16 daltons, how many molecules does one mole of table sugar (sucrose; c12h22o11)
One mole of table sugar (sucrose: C12H22O11) would contain about 6.022 x 10^23 molecules of sucrose.
In order to calculate the number of molecules present in one mole of table sugar i.e. sucrose ( C12H22O11 ), we need to calculate the molecular mass of sucrose firstly. To get the molecular mass of sucrose the atomic masses of all the contributing atoms is needed to be added :
Molecular mass of sugar will be = (12 x 12) + (22 x 1) + (11 x 16)
= 144 + 22 + 176
= 342 daltons
So, according to avogadro's law one mole of sucrose will have the mass of 342 grams. Now, to calculate the number of molecules present in one mole of sucrose, we have to use Avogadro's number. Which is the number of particles (atoms, molecules, or ions) present in one mole of a substance. Avogadro's number is approximately 6.022 x 10^23 particles per mole.
Therefore, the number of molecules in one mole of sucrose can be calculated below :
Number of molecules in one mole of sucrose = 1 × (6.022 x 10^23) molecules.
So, the number of molecules in 1 mole of sucrose is calculated to be approximately 6.022 x 10^23 molecules.
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A calcium supplement contains 570 mg of calcium per tablet. Write the equality for this statement. Express your answer using correct number of significant figures.
1 tablet = mg of calcium
A calcium supplement contains 570 mg of the calcium per tablet. The equality for this statement is 610 mg of the calcium = 1 tablet .
The Amount of the calcium present in the calcium supplement is 610 mg per tablet . The Equality statement are obtained is expressed as follows: 610mg of the calcium = 1 tablet
Our body needs calcium to be build and to maintain the strong bones. Our heart, muscles and the nerves also need the calcium to function it properly. When our body calcium intake is insufficient, and our body will remove the calcium from the bones, and making them weak and the brittle.
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A student accurately measured the volume of a solution, but spilled some before measuring solution mass. What is the effect on calculated solution density?
The calculated solution density is lower than the actual density
The predicted mass of the solution will fall short of the actual mass of the solution if the student spilled part of the solutions prior to taking the mass measurement.
What is the solution's total mass?After we have the masses of the solute and solvent, we may add them to determine the mass of both the solution. Masses are always additive. Hence, we may determine the solution's density by knowing its mass and volume.
What are the meanings of the terms "solute" and "solution mass"?Mass or moles are used to describe the solute's concentration. A solution's mass percent is computed by dividing the grams of component per grams of solutions by 100 to arrive at the percentage. The mass of each element in a mole of the compound as well as its molar mass are both solved by using the Mass Percent formula.
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An experimental volume of 21.4 L is determine for 1 mole of gas at STP. What is the experimental error?|Accepted−Experimental / Accepted ×100%A)Between 5 and 10%B) Between 10 and 15%C) Between 15 and 20%D) A little less than 5%
The experimental error is a little less than 5%, which corresponds to option D.
What is the experimental error?Experimental error refers to the difference between a measured or observed value and the true value of a quantity. In other words, it is the difference between the value obtained from an experiment or measurement and the value that would be expected in theory or from a known reference.
Using the formula for experimental error, we have:
Experimental error = {Accepted - Experimental} / Accepted x 100%
Substituting the given values, we get:
Experimental error = |22.4 L - 21.4 L| / 22.4 L x 100%
Experimental error = 0.9 L / 22.4 L x 100%
Experimental error = 4.02%
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Turn off the heat and place it into the “Cool” position. 2. Where are the energy symbols going and what does this represent?
Your system is set to heat or cool to this temperature. To change the target temperature, rotate the thermostat's ring either clockwise or anticlockwise.
What are the units of temperature?The most popular scales are the Celsius scale, sometimes known as centigrade, with the unit symbol °C, the Fahrenheit scale (°F), and the Kelvin scale (K), with the latter being mostly used for scientific purposes. One of the seven base units in the International System of Units is the kelvin (SI).
What are the properties of temperature?A thermometric property is one that is affected by temperature. Volume, pressure, electrical resistance, emf, and color are a few examples. A thermometer can be created with one of these characteristics.
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Which of the following formulas represents that of an unsaturated hydrocarbon with 3 degrees of unsaturation?a) C10H20b) C8H14c) C12H24d) C6H6e) C4H10f) C8H12
Hydrocarbons Unsaturation occurs in organic molecules because of the double and bonds present that are present.
What are the uses of hydrocarbons?
Hydrocarbon. The main components of natural gas and petroleum are hydrocarbons. They are used as lubricants, fuels, and raw materials for making industrial chemicals, polymers, fibers, rubber, solvents, and explosives.
Which firms produce the most hydrocarbons?
Exxon Mobil, Texaco, Royal Dutch Oil, Saudi Arabia, and PetroChina are a few of the biggest oil firms. The economies and financial markets around the world are significantly impacted by these businesses' success and capacity to offer energy resources effectively and affordably.
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How do mineral nanoparticles in sunscreens protect from UV radiation? Multiple Choice A) The particles scatter incoming UV light B) The particles absorb incoming UV light C) The particles dissolve with incoming UV light D) None of these choices are correct
Mineral nanoparticles in sunscreens protect from UV radiation by scattering incoming UV light and the correct option is option A.
What are nanoparticles?
A nanoparticle is a small particle that ranges between 1 to 100 nanometres in size. Undetectable by the human eye, nanoparticles can exhibit significantly different physical and chemical properties to their larger material counterparts.
Nanoparticles have a very large surface area to volume ratio when compared to bulk material, such as powders, plate and sheet.
This feature enables nanoparticles to possess unexpected optical, physical and chemical properties, as they are small enough to confine their electrons and produce quantum effects.
Protective properties of sunscreens work on the basis of absorption and scattering of incident radiation by their ingredients (UV filters). These chemical and physical compounds are organic molecules that absorb UV light and mineral nanoparticles that exhibit absorbing and scattering properties, respectively.
Therefore, mineral nanoparticles in sunscreens protect from UV radiation by scattering incoming UV light and the correct option is option A.
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9. which compound in the following pairs would you expect to have the higher absolute entropy? briefly explain your rational for each. i. 1 mol co2(g) and 1 mol co(g) ii. 45 g sc(s) and 45 g sc(g) iii. 1 mole n2o4(g) in 1l and 1 mole n2o4(g) in 2l iv. 1 mole nh3(g) in 1l at 298k and 1 mole nh3(g) in 1l at 498k
1 mole n2o4(g) in 1l and 1 mole n2o4(g) in 2l compound in the following pairs would you expect to have the higher absolute entropy.
The correct option is (iii).
What is absolute and residual entropy?The lowest point on the enthalpy temperature scale is known as absolute zero. The entropy that a substance still possesses even at absolute zero is referred to as residual entropy. The vitreous state, or glass, is the most prevalent non-equilibrium state seen. Carbon monoxide is an additional example.
Is positive absolute entropy a constant?Free energy has to be negative for a process to be spontaneous. Reason: Changes in enthalpy and entropy are connected to changes in free energy. If a process is spontaneous, its change in entropy must always be positive.
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Write the formula for Potassium Permanganate.
Answer:
KMnO4
Explanation:
The chemical formula for potassium permanganate is KMnO4.
꧁༒αηѕωєяє∂ ву gσ∂кєу༒꧂
Answer:
KmN04
Explanation:
.....,...........
The solubility of a gas in water will typically decrease most with Select the correct answer below:
A. increasing polarity.
B. decreasing polarity.
C. decreasing temperature.
D. increasing pressure.
The solubility of a gas in water will typically decrease with decrease in polarity. Hence, the correct choice is B.
Generally, the solubility of any gas in a particular liquid is defined as the volume of the gas present in cc which can dissolve in a unit volume of the liquid in order to form the saturated solution at the temperature of the experiment and under the pressure of one atmosphere.
Generally the solubility of the gas in a liquid solution decreases with increase in temperature and decrease in polarity. This is due to, with an increase in temperature, the kinetic energy present in the gas molecule usually increases, thus it becomes difficult for liquid molecules to hold them. Hence, the correct option is B.
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help me pleaseeeeeeeeeeeee
Answer:
B. Thermal energy was transferred more quickly into the salmon on the right side of the grill.
Explanation:
The tempurature of the Salmon on the right said is higher and the inital tempurates were the same. Meaning that that one on the right transferred thermal energy faster.
The part of a melting-alloy overload that responds to an overload current is known as the
79. Chemical Symbol Parade
Answer:Chart that arranges all of the known elements in a particular order.
cExplanation:Chart that arranges all of the known elements in a particular order.Chart that arranges all of the known elements in a particular order.Chart that arranges all of the known elements in a particular order.Chart that arranges all of the known elements in a particular order.
How many atoms are in 36.4g of magnesium?
Divide the 36.4g mass by atomic mass units of magnesium, 24.31g/mole to get moles of Mg.
Multiply answer from step one by 6.022×10^23 (Avogadros Number) to get your final answer.
in an atom, what type of particle orbits the others?
Answer:
Electrons orbit the nucleus in an atom.
term for the negatively charged subatomic particle are called____
An atom has a charged as well as neutral particles and these particles is called subatomic. The term for the negatively charged subatomic particle are called electrons.
An atom is the smallest unit of matter. There are three main types of subatomic particles : protons, neutrons and electrons. Two subatomic particles have charged particles, that is, protons are positively charged and electrons are negatively charged. An electron is a daughter particle of an atom, a negatively charged particle that orbits around the nucleus at a constant. Scientist J. J. Thompson discovers the electron. An electron has a charge of negative 1.60217662 × 10⁻¹⁹ Coulombs. The mass of a electron is 9.1093835× 10⁻³¹kg.
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Mass (g) to mass (g)
2Na + 2H2O >2NaOH+ H2
How many moles of NaOH are produced if 120 grams of H2O are available?
Answer:
4.44 g
Explanation:
First, we need to determine the limiting reactant. The balanced chemical equation is:
2Na + 2H2O → 2NaOH + H2
From the equation, we see that 2 moles of sodium reacts with 2 moles of water to produce 1 mole of hydrogen.
Moles of Na in 120 g of Na:
Molar mass of Na = 22.99 g/mol
Number of moles of Na = mass/molar mass = 120 g / 22.99 g/mol = 5.22 mol
Moles of water in 80 g of H2O:
Molar mass of H2O = 18.02 g/mol
Number of moles of H2O = mass/molar mass = 80 g / 18.02 g/mol = 4.44 mol
Since 5.22 moles of Na requires 5.22 moles of H2O, water is the limiting reactant.
The moles of hydrogen produced is equal to the moles of the limiting reactant, which is 4.44 mol.
The mass of hydrogen produced is:
Mass = number of moles x molar mass
Mass = 4.44 mol x 1 g/mol = 4.44 g
So the grams of hydrogen produced by the 120 grams Na and 80 grams of water is 4.44 grams.
Choose the best answer. Nuclear power plants produce electricity using energy from the radioactive decay of (a) uranium-235. (b) uranium-238. (c) plutonium-235. (d) plutomium-238.
Nuclear power plants produce electricity using energy from the radioactive decay of uranium-235. Option A is correct.
Nuclear power plants use nuclear reactors to produce heat through a process called nuclear fission, in which the nucleus of an atom is split into two smaller nuclei, releasing a large amount of energy. Uranium-235 is a naturally occurring radioactive isotope of uranium that is used as fuel in nuclear reactors because it undergoes nuclear fission more readily than other isotopes.
Uranium-238 is also used in nuclear reactors, but it must first be converted into plutonium-239 through a process called nuclear transmutation. Plutonium-235 and plutonium-238 are also used as nuclear fuel in certain types of nuclear reactors, but they are produced artificially through nuclear transmutation.
Hence, A. uranium-235 is the correct option.
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what is the molality of a solution that contains 16.32 g of glucose, c6h12o6, in 505.0 g of water? group of answer choices 0.356m 0,0900m 0.180 m 0.0323 m
The molality of the solution that contains 16.32 g of glucose is calculated as 0.180 m.
What is molality?Molality can be defined as number of moles of solute per kilogram of solvent. To find the molality of the solution, we need to calculate number of moles of glucose and the mass of the solvent.
Molar mass of glucose (C6H12O6) is: 6 x 12.01 + 12 x 1.01 + 6 x 16.00 = 180.18 g/mol
Number of moles of glucose is: n = m / M = 16.32 g / 180.18 g/mol = 0.0905 mol
Mass of water is 505.0 g.
The molality is: molality = moles of solute / mass of solvent in kg
mass of solvent = 505.0 g = 0.5050 kg
molality = 0.0905 mol / 0.5050 kg = 0.1795 mol/kg
molality = 0.180 m
Therefore, the molality of the solution is 0.180 m.
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2n2 o2 → 2n2o if 0.49 mol of nitrogen reacts with 0.49 mol of oxygen, what is the limiting reactant?
2N₂ + O₂ → 2N₂O if 0.49 mol of nitrogen will reacts with 0.49 mol of oxygen, then the limiting reactant is nitrogen.
To determine the limiting reactant, we need to compare the amount of product that can be formed by each of the reactants. The reactant that produces the lesser amount of product will be the limiting reactant.
Balanced chemical equation for the reaction will be:
2N₂ + O₂ → 2N₂O
From the equation, we can see that 1 mole of O₂ reacts with 2 moles of N₂ to produce 2 moles of N₂O. Therefore, if 0.49 mol of N₂ reacts, we would need 0.49/2 = 0.245 mol of O₂ to completely react with all of the N₂.
Since we have 0.49 mol of O₂, which is greater than the amount required to react with all of the N₂, oxygen is in excess and nitrogen is the limiting reactant.
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how to remember the names of different gas laws
You must keep in mind the ideal gas rule law that PV = NRT, which has a pleasant sound to it.
Several scientists created the gas laws at the close of the 18th century (after whom, the individual laws are named). There are five gas laws:
Boyle's Law, which establishes a connection between a gas's pressure and volume. Charles' Law, which establishes a connection between a gas's volume and its exact temperature. Gay-Law, Lussac's which establishes a connection between a gas's absolute temperature and the pressure it exerts on the container's sides. Avogadro's Law, which establishes a correlation between a gas's volume of filled space and its mass. The result of combining the four aforementioned principles is the Combined Gas Law (also known as the Ideal Gas Law).Learn more about gas laws-
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when an oceanic plate converges with another plate subduction occurs the oceanic plate is pushed beneath the other plate a trench is formed when the plate is being pushed beneath the other what rock can likely result?
When an oceanic plate is subducted beneath another plate during a convergent boundary, the rock that can likely result is metamorphic rock.
Explanation:
This occurs because as the oceanic plate is subducted, it is forced deep into the Earth's mantle where it is subject to extreme heat and pressure. This heat and pressure cause the minerals and rocks in the oceanic plate to recrystallize, creating metamorphic rocks.
Examples of metamorphic rocks that can be formed from subducted oceanic plates include blueschist, eclogite, and amphibolite. These rocks can then be brought to the surface through a process called uplift and can be studied to understand the geological history of the area.
~ Zeph
Express the rate of reaction in terms of the change in concentration of each of the reactants and products:
A(g) + 2B(g) → C(g)
a. Rate = − Δ[A]/Δt = − 2/1 Δ[B]/Δt = Δ[C]/Δt
b. Rate = − Δ[A]/Δt = − Δ[B]/Δt = Δ[C]/Δt
c. Rate = − Δ[A]/Δt = − 1/2 Δ[B]/Δt = Δ[C]/Δt
When [B] is decreasing at 0.44 mol/L·s, how fast is [A] decreasing?
____mol/L·s
The correct answer is: c. Rate = − Δ[A]/Δt = − 1/2 Δ[B]/Δt = Δ[C]/Δt. The rate at which [A] is decreasing is 0.22 mol/L·s. The rate of a reaction can be affected by various factors, including temperature, pressure, concentration, and the presence of a catalyst.
In this reaction, the stoichiometric coefficient for A is 1, and the stoichiometric coefficient for B is 2. Therefore, for every mole of A that reacts, 2 moles of B react, and 1 mole of C is formed.
According to the given rate expression, the rate of the reaction is proportional to the change in concentration of each species, with the coefficients of the reactants and products taken into account.
So, if [B] is decreasing at 0.44 mol/L·s, we can use the rate expression to calculate the corresponding rate of change in [A]:
Rate = − Δ[A]/Δt = − 1/2 Δ[B]/Δt
We know that Δ[B]/Δt = -0.44 mol/L·s (since [B] is decreasing). Substituting this value into the rate expression, we get:
Rate = − Δ[A]/Δt = − 1/2 (-0.44 mol/L·s) = 0.22 mol/L·s
Therefore, the rate at which [A] is decreasing is 0.22 mol/L·s.
The rate of a chemical reaction is the speed at which the reactants are converted into products. It is expressed as the change in the concentration of a reactant or product per unit time, typically in units of mol/L·s or M/s. The rate of a reaction can be affected by various factors, including temperature, pressure, concentration, and the presence of a catalyst.
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What is a major difference between inorganic and organic compounds? A.There are many more inorganic compounds than organic compounds B.Organic compounds contain carbon; few inorganic compounds do. C.Organic compounds are never ionic. D.Organic compounds tend t0 be more polar than inorganic compounds.
The significant difference between inorganic and organic compounds is that an organic compound contains carbon; few inorganic compounds do. The correct answer is option(B).
Organic compounds are molecules made up of a combination of carbon, hydrogen, and oxygen atoms. Organic compounds are said to be more volatile and also highly combustible. These compounds are often associated with living organisms and are found in foods and medicines. These are insoluble in water.
Examples of organic compounds are carbohydrates, fats (lipids), proteins, and nucleic acids, which are the basis for the molecules of life.
Inorganic compounds are made up of atoms from different elements, such as metals, sulfur, or nitrogen, and are not associated with living things. These compounds are not flammable and are non-volatile in nature. These are soluble in water and also non-soluble in some of the organic solutions.
Examples of inorganic compounds include table salt (sodium chloride), bleach (sodium hypochlorite), and ammonia (NH3). The compound which despite having carbon are inorganic are graphite, carbon dioxide, carbon monoxide, carbides (e.g, Silicon Carbide), carbonates ( Calcium Carbonate), and some cyanides.
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The mass of a certain substance is 17. 5 kg. The density of the substance is 1. 71 g/ml. Determine the volume (in liters) of the substance
The volume of the substance is approximately 10.20468 liters.
Volume is the three-dimensional area that a material occupies or that is encircled by a surface. The cubic metre is the common unit of volume in the International System of Units (SI) (m3). The litre (L) is the volume unit used in the metric system.
First, we need to convert the mass to grams since the density is given in grams per milliliter:
17.5 kg = 17,500 g
Then, we can use the formula:
Density = mass / volume
to solve for the volume:
volume = mass / density
volume = [tex]17,500 g / 1.71 g/ml[/tex]
volume = 10,204.68 ml
Finally, we can convert milliliters to liters by dividing by 1000:
volume =[tex]10,204.68 ml / 1000 ml/liter[/tex]
volume = 10.20468 liters (rounded to 5 decimal places)
Therefore, the volume of the substance is approximately 10.20468 liters.
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The central core of the atom which accounts for most of its mass is
The central core of the atom which accounts for most of its mass is the nucleus.
The nucleus, which makes up the majority of the bulk of an atom, is composed of protons and neutrons, also known as nucleons, which are held together by the nuclear force. The nucleus, located in the center of the cell, is home to all of the chromosomes, which are responsible for encoding the genetic material. Therefore, protecting this component of the cell is very essential. The chromosomes are all kept inside the nucleus by a membrane, which also distinguishes between the chromosomes being inside the nucleus and the other structures and parts of the cell remaining outside. There are pores in the nuclear membrane that enable molecules to enter and exit the nucleus when necessary, such as when RNA needs to move between the nucleus and the cytoplasm.
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