The heat of combustion of methanol (CH₃OH) can be calculated by subtracting the sum of the bond energies of the reactants from the sum of the bond energies of the products. The heat of combustion is defined as the amount of heat released when a substance is burned in excess oxygen. The heat of combustion of methanol is 879 kJ/mol.
In this reaction, one mole of CH₃OH reacts with one-half mole of O₂ to produce one mole of CO₂ and one mole of H₂O:
CH₃OH + 0.5 O₂ → CO₂ + H₂O
The bond energies can be used to calculate the total energy of the reactants and the products:
Reactants:
CH₃OH: 3 C-H bonds (3 x 413 kJ/mole) + 1 C-O bond (358 kJ/mole) = 1,267 kJ/mole
0.5 O₂: 0.5 x 498 kJ/mole = 249 kJ/mole
Total energy of reactants: 1,267 kJ/mole + 249 kJ/mole = 1,516 kJ/mole
Products:
CO₂: 1 C=O bond (745 kJ/mole) + 2 O-C bonds (2 x 358 kJ/mole) = 1,461 kJ/mole
H₂O: 2 O-H bonds (2 x 467 kJ/mole) = 934 kJ/mole
Total energy of products: 1,461 kJ/mole + 934 kJ/mole= 2,395 kJ/mole
Heat of combustion: Total energy of products - Total energy of reactants = 2,395 kJ/mole - 1,516 kJ/mole = 879 kJ/mole
Therefore, the heat of combustion of methanol is 879 kJ/mol. The heat of combustion of methanol (CH₃OH) can be calculated by subtracting the sum of the bond energies of the reactants from the sum of the bond energies of the products.
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What is the shorthand electron configuration of a potassium ion (K+)?
The shorthand electron configuration of a potassium ion (K+) is [Ar] 4s1.
Electron configuration refers to the arrangement of electrons in an atom or ion. In a neutral atom, the number of electrons is equal to the number of protons, resulting in a neutral charge. However, in an ion, the number of electrons is not equal to the number of protons, resulting in a charge.
The shorthand electron configuration uses symbols from the periodic table to represent the elements, with electron configurations being abbreviated by using the noble gas symbol (in square brackets) that precedes the element in question in the periodic table. In this case, the noble gas symbol [Ar] represents Argon, and the electron configuration of K+ is then given as [Ar] 4s1, indicating that the electron configuration of potassium has lost one electron from its 4s orbital, leaving a single electron in the 4s orbital and a positive charge on the ion.
In more detailed terms, the electron configuration of a neutral potassium atom would be [Ar] 4s1 3d10, where the [Ar] represents the electron configuration of Argon (the preceding noble gas in the periodic table), and the 4s1 and 3d10 indicate the number of electrons in the 4s and 3d orbitals, respectively. However, in the case of a potassium ion, one electron has been removed, resulting in a positive charge and the shorthand electron configuration of [Ar] 4s1.
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How do you calculate atomic mass with percent abundance and isotopes?
To convert each percentage of abundance to a decimal, divide it by 100. Add the atomic mass of the isotope to this value. The atomic mass is obtained by averaging the atomic masses of each isotope.
Is the atomic mass calculated using percent abundance?To calculate the weighted average, we must take each isotope's % natural abundance into effect. The weighted mean of the atomic masses of an element's naturally occurring isotopes serves as the element's atomic mass.
What does an isotope's percentage abundance mean?The proportion of atoms with a particular atomic mass that can be found in a found naturally sample of an element is known as the relative abundance of an isotope.
How do isotopes work?Isotopes are atoms of the same element that have differing mass numbers but the same atomic number. Example: Protium (Z=1, A=1), Deuterium (Z=1, A=2), and Tritium (Z=1, A=3) are hydrogen isotopes.
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Town A experiences several days of cold temperatures and steady rain. Town B, which is twenty kilometers east of Town A, experiences rain and warm yemperatures during. The same time. What weather pattern explains these events?
The weather pattern that explains these events in Towns A and B is likely a temperature inversion.
This occurs when a layer of warm air is trapped above a layer of cold air, causing the warm air to stay close to the ground and the cold air to remain in the upper atmosphere. In this scenario, Town A would be experiencing the cold, rainy weather because it is located under the layer of cold air, while Town B would experience the warm, rainy weather because it is located above the layer of warm air. This type of weather pattern can last for several days and is caused by differences in air pressure and temperature.
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Beaker A contains sulphuric acid and beaker B contains ethanoic acid.
Answer:
Explanation:
TRY LITMUS PAPER TEST
turn red if it comes in contact with an acid (a substance with pH between 0 and 7) and blue if it comes in contact with a base (a substance with pH between 7 and 14).
When a pure substance undergoes a change from a solid state to a gaseous state, this is an example of a Select the correct answer below. physical change chemical change electrical change
none of the above
Option A. Physical change. When a substance changes from a solid to a gaseous state, it is an example of a physical change.
A physical change is a type of change that occurs when a substance undergoes a change in its physical properties, such as state, size, shape, or volume, without undergoing a chemical reaction. In other words, the chemical composition of the substance remains the same. When a pure substance changes from a solid state to a gaseous state, it is an example of a physical change. In this type of change, the substance is undergoing a phase transition from a solid to a gas without passing through a liquid phase, which is also known as sublimation. Physical changes are reversible and do not result in the formation of new substances. Examples of physical changes include melting, freezing, boiling, condensation, evaporation, and the change of state from solid to gas. Physical changes play a crucial role in many natural processes and are also important in many industrial and technological applications.
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Complete question:
When a pure substance undergoes a change from a solid state to a gaseous state, this is an example of a Select the correct answer below.
A) physical change
B) chemical change
C) electrical change
D) none of the above
How many valence electrons does boron have? A.2 B.3 C.3 D.3
Option 3 is the correct answer .
What is electron ?
Electrons are subatomic particles that have a negative electric charge. They are located outside the atomic nucleus in the electron cloud, and they play a crucial role in chemical reactions and electrical conductivity. The study of electrons and their behavior is called electromagnetism, and it is a fundamental field of physics.
Electrons occupy different energy levels, or shells, around the nucleus and can move between these shells through a process called electron excitation. This movement of electrons is what gives atoms their chemical properties and allows them to bond with other atoms to form molecules.
In a conductor, electrons are free to move and carry an electric current. In an insulator, electrons are tightly bound to their atoms and do not move freely, so they cannot carry an electric current.
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How much phosphorous is in plant food?
The exact amount of phosphorous in plant food depends on the specific product, as well as the intended use and type of plant it is formulated for.
Plant food typically contains varying amounts of phosphorous, one of the three primary macronutrients essential for plant growth and health along with nitrogen and potassium.
For example, standard all-purpose plant food will often have a balanced ratio of the three macronutrients, including around 10% phosphorous. However, specific plant food products may have higher or lower amounts of phosphorous, with some formulated for high-phosphorus crops like tomatoes or flowering plants.
It's important to note that too much phosphorous can lead to imbalanced soil nutrient levels, potentially inhibiting the uptake of other essential micronutrients like iron and zinc. Therefore, it's important to follow label instructions and not over-fertilize with high-phosphorus plant food.
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One mole of ____ contains the smallest number of atoms.
a) S8
b) C10H8
c) Al2(SO4)3
d) Na3PO4
e) NaCl
The smallest mole is one mole of sodium chloride. E is the right response.
What are the uses of NaCl?As an electrolyte replenished, sodium chloride is used to assist reduce heat cramps brought on by excessive perspiration.This drug is also used to make a standard isotonic sodium chloride solution.
Determine how many atoms there are in every mole of the specified elements as a first step.
For S₈
8 atoms of sulphur
∴Total atoms = 8 atoms
For NaCI
1 atom of Chlorine
1 atom of Sodium
∴ Total atoms = 2 atoms
For AI₂(S0₄)₃
2 atoms of Al
3 atoms of sulphur
12 atoms of oxygen
∴ Total = 17 atoms in one mole of AI₂(S0₄)₃
For C₁₀H₈
10 atoms of Carbon
8 atoms of hydrogen
Total atoms = 18 atoms
For Na₃PO₄
3 atoms of sodium
1 atom of P
4 atoms of Oxygen
Total atoms = 8 atoms
As a result, we may say that of the elements listed, 1 mole of NaCl has the fewest atoms.
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amino acids have similar structures. what part of an amino acid’s molecular formula distinguishes the macromolecule from other amino acids?
Amino acids have similar structures, the functional group linked to the central carbon atom makes one amino acid different from another (also known as the alpha carbon).
Each amino acid has a different functional group, also known as the R group, which gives it its own special characteristics. The R group, which might be a hydrogen atom, an alkyl group, a functional group with a charge, or a functional group with a polar or hydrophobic property, governs the physical and chemical properties of an amino acid.
The distinctive R group connected to the alpha carbon, together with the carbon, hydrogen, nitrogen, oxygen, and sulfur atoms that make up the backbone structure, are all included in the chemical formula of an amino acid. The distinctive R group that sets one amino acid from from another is also what helps peptide bonds, polypeptides, and proteins develop.
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I have 7.83x10^-2 helium how many grams he do have?
Answer:
It depends on the missing unit.
Explanation:
What is meant by "7.83x10^-2 helium?" Helium atoms, kg, cm^3, ? Without the unit, the statement is meaningless. If the unit is kg, then:
(7.83x10^-2 kg helium)*(1,000g/1kg) = 78.3 grams He
which of the type(s) of protons given are chemically non-equivalent?
Diastereotopic protons is the type(s) of protons given are chemically non-equivalent .
What is Diastereotopic protons ?
Diastereotopic protons are essentially different from one another chemically, and they all result in different chemical changes. Usually, this kind of proton belongs to a CH2 group and is found in chiral molecules, although it can also be found in the achiral compounds' more subtle chemical surroundings.
Which protons have the same chemical properties?
Homotopic protons exhibit identical NMR absorptions because their electronic properties are identical because they are chemically comparable.
Understanding NMR will rely heavily on the capacity to distinguish between chemical equivalency and nonequivalency among atoms in a molecule.
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which of the follow compounds is bonded together by ionic bonds?
An ionic bond, sometimes known as just an electrovalent bond, is formed when two ions with opposite charges are electrically attracted to one another in a chemical molecule. This kind of link is made when the valence (outermost) electrons of one atom were permanently transported to another atom.
What, exactly, is indeed an ionic bond?A chemical molecule's ionic bond, often known as such an electrovalent bond, is produced by the electrostatic force between ions with different charges. This type of bond develops when the valence electrons, which are an atom's outermost electrons, are permanently transferred through one atom to another.
What makes for a good ionic bond?When two sodium atoms and one fluorine atom form an ionic bond, sodium fluoride, also know as NaF, is the result. As part of this process, the fluorine atom receives the single valence electron from the sodium atom with just enough room.
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which type the 3D clay sphere or the 2D cross-section diagram provides more advantages as a model
The 3D clay sphere provides more advantages as a model than 2D cross-section diagram. A diagram is a simple picture or representation.
What is diagram?In many facets of our everyday life, including work, education, personal projects, and much more, diagrams are typically employed. For any business, professional activity, or personal project, creating a clear and well-defined diagram is crucial to displaying a certain concept, idea, relationship, anatomy, statistical data, and any issue in an orderly manner.
A diagram is a simple picture or representation made out of lines and forms that serves to illustrate a certain concept, idea, information, or subject. The 3D clay sphere provides more advantages as a model than 2D cross-section diagram.
Therefore, the 3D clay sphere provides more advantages as a model.
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if you know that you have 4.52 x 10-2 moles of metal ions in a 125 ml sample, what is the molarity of the sample? place your answer in 3 significant figures, not in scientific notation, and no unit. be sure to include the zero before the decimal.
Metal chloride has a 16.485% chloride concentration. To create the precipitate, agency, for a soluble metal, 73.5 ml of 0.256 m agno3 must be added to the metal chloride (s).
In order for your body to function properly and to keep you hydrated and healthy, electrolytes are required. One of the most important is chloride, which is an electrolyte. Along with salt and potassium, they maintain a balance in your body's acid and base levels. It is responsible for managing the fluid movement into and out of your cells. Metal chlorides, bromides, and to a lesser extent iodides continue to be the three most important class introductory materials in inorganic chemistry. Chlorine has a molecular weight of 1.88 * 10-2 * 35.5. = 0.667g. Therefore, the chloride content of metal chloride is represented as 0.667/4.046 * 100. = 16.485%
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Logan demonstrates to the class how mass must be conserved in every chemical reaction.
He measures the mass of hydrochloric acid and a magnesium strip separately. He then places the magnesium strip into the acid and bubbles form as the magnesium seems to
disappear. The combined mass afterward is less than the original.
Hydrochloric Acid + Magnesium
How could Logan explain this lower mass?
This is not a chemical reaction so the conservation laws do not apply.
The magnesium is destroyed and therefore the mass is less after the reaction.
The bubbles indicate that a gas is created and mass is lost as it escapes from the container.
The student must have not measured the mass correctly.
The bubbles indicate that a gas is created and mass is lost as it escapes from the container. Option 3.
Law of mass conservationAccording to the law of conservation of mass. the combined mass before the reaction must be equal to the combined mass after the reaction.
In the case of hydrochloric acid and magnesium, this is not the case. It is not so because when hydrochloric acid reacts with magnesium metal, hydrogen gas is liberated in the form of bubbles. These bubbles escaped into the atmosphere in the case of Logan.
Thus, the remaining mass must have escaped in the form of a gas.
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Which of the following generated osmotic pressure? sodium chloride, glucose and albumin generated osmotic pressure. sodium chloride glucose albumin
All three substances (sodium chloride, glucose, and albumin) can generate osmotic pressure.
Osmotic pressure is the pressure that arises from the difference in concentration of solutes between two solutions separated by a semi-permeable membrane. The semi-permeable membrane allows small solvent molecules, such as water, to pass through it but not larger solute molecules.
Sodium chloride, glucose, and albumin can all generate osmotic pressure because they are all solutes that are not able to pass through the semi-permeable membrane. As a result, a higher concentration of these substances on one side of the membrane compared to the other creates an imbalance in the concentration of solvent and solute, leading to the movement of solvent from the side with lower concentration to the side with higher concentration. This movement generates pressure, which is known as osmotic pressure.
In summary, the generation of osmotic pressure depends on the presence of solutes that are not able to pass through the semi-permeable membrane, and all three substances (sodium chloride, glucose, and albumin) fit this criteria.
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Calculate the average atomic ma for neon of it abundance in nature i 90. 5% neon-20,0. 3% neon-21, and 9. 2% neon-22
The average atomic mass for neon of it abundance in nature is 90. 5% neon-20,0. 3% neon-21, and 9. 2% neon-22 is 20.187 amu
Isotopes are members of the same element's family but have various numbers of neutrons and the same number of protons.
In this case, we calculate the average atomic mass of the specified element by taking into consideration the mass and abundance of each isotope. The average atomic mass can be calculated using the following equation:
Average atomic mass = (mass₁ x abundance)+( mass₂ x abundance)+( mass₃ x abundance)
Average atomic mass = (0.905 x 20) + (0.003 x 21) +( 0.092 x 22)
Average atomic mass = 20.187 amu
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3) what is the molarity of a solution that was prepared by dissolving 14.2 g of nano3 (molar mass = 85.0 g/mol) in enough water to make 350 ml of solution?
The molarity of the solution that is prepared by dissolving 14.2 g of NaNO₃ in enough water to make 350 ml of solution is 0.477 M.
The mass of the NaNO₃ = 14.2 g
The molar mass of the NaNO₃ = 85 g/mol
The moles of the NaNO₃ = mass / molar mass
The moles of the NaNO₃ = 14.2 / 85
The moles of the NaNO₃ = 0.167 mol
The molarity expression is as:
The molarity = moles / volume
The molarity = 0.167 / 0.350
The molarity = 0.477 M
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(30 POINTS)
Modeling the Greenhouse Effect
In this activity, you will model the greenhouse effect by graphing air temperature over time.
You will need these materials:
2 empty two-liter plastic bottles (or 2 clear plastic containers, similar in size), rinsed
2 thermometers (not mercury) that will each fit inside a bottle
a lamp with a 150-watt incandescent bulb (if direct sunlight is not available)
a measuring cup
soil (4 cups)
a roll of plastic wrap
a scissors or utility knife
clear tape
1 rubber band
6-8 ice cubes (all the same size)
Follow these steps to set up the experiment, and then answer the question in part A.
Cut off the neck of each bottle using the scissors as shown in the image. Stay safe: cut slowly and carefully so you do not cut yourself. If you’re using containers other than bottles, no cutting is needed.
Add two cups of soil to each bottle.
Place 3–4 ice cubes on top of the soil. The number of cubes must be the same in each bottle.
Tape a thermometer into the inside wall of each bottle. Stay safe: do not use mercury thermometers in the event they might break. Be sure to face the thermometer outward from the bottle for easy reading.
Cover the top of one bottle tightly with plastic wrap secured by a rubber band. Leave the other bottle open.
Position the bottles so that they are an equal distance from the lamp. (If you're not using a lamp, place the bottles in direct sunlight.) Turn the lamp on. Stay safe: To avoid electrocution, keep all water away from electrical sources.
Face the thermometers in the same direction for easy reading, as shown in the image.
a plastic bottle cut in half
two plastic bottles containing thermometers kept under a lamp
Hypothesis and Data Collection
Part A
Study your experiment setup. In 30 minutes, how will the air temperature in the bottles compare? What do you predict will happen to the ice in each bottle?
The answers include the following:
There will be an increase in the air temperature in the bottle.The ice which is present in each bottle will melt when observed after minutes.What is Temperature?This is referred to as the degree of hotness or coldness of a substance and it is influenced by thermal energy with the unit being in Kelvin which is denoted as K.
Greenhouse effect leads to an increase in the temperature of the environment due to the depletion of the ozone layer thereby causing global warming which is experienced in today's world and is the reason why the ice will melt.
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What is a renewable resource?
Answer:
also known as a flow resource, is a natural resource which will replenish to replace the portion depleted by usage and consumption, either through natural reproduction or other recurring processes in a finite amount of time in a human time scale.
differentiate between homogeneous and heterogeneous mixtures with examples
Answer:
heterogenous- easily seen, easy to seperate, can see what makes it up-trail mix
homogenous- can't see all of the parts that make it up, difficult to separate
Explanation:
what is the density of nitrogen gas at stp
The density of nitrogen gas will be 1.25 g/L at S.T.P.
The density of a material shows the denseness of that material in specific given area. A material’s density is termed as its mass per unit volume. Density is essentially the measurement of how tightly matter will be packed together. It is a unique physical property of the particular object.
At STP, one mole of any gas occupies 22.4litres of volume. Nitrogen will exists in molecular form as N2.
So, the Density = Molecular mass / Volume
Molecular mass of one mole of N2 is 14(2) = 28 grams and Volume is 22.4 liters.
Density = 28 /22.4 g / L
= 1.25 g /L
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Suppose that instead of letting the pipet drain naturally when delivering the stock solution used to prepare known solution #5 in part II of the procedure, you used the bulb to expel the last drop remaining in the pipet tip into the flask. a. Describe how the concentration of known solution #5 will be affected by this error. ** b. Describe how the absorbance measurement of known solution #5 will be affected by this error. ** c. Since the absorbance of known solution #5 is used to generate the Beer’s Law plot, state how will the slope of the best-fit line be affected by this error
When preparing a solution, it is important to accurately measure the volume of the stock solution being used. The method used to deliver the solution into the flask can impact the final concentration of the solution and therefore affect the absorbance measurement and the slope of the best-fit line generated from the absorbance measurements.
a. Impact on concentration of known solution #5:
When the last drop remaining in the pipet tip is expelled using the bulb, it may cause an overestimation of the volume of the stock solution being delivered into the flask. This leads to an increase in the total volume of the solution, thereby diluting the concentration of the solution. As a result, the concentration of known solution #5 will be lower than expected, leading to an error in the final solution concentration.
b. Impact on absorbance measurement of known solution #5:
Absorbance is a measure of how much light a solution absorbs and is proportional to the concentration of the absorbing species in the solution. Since the concentration of known solution #5 is affected by the error described above, the absorbance measurement of this solution will also be affected. If the solution is more dilute than expected, it will absorb less light, resulting in a lower absorbance measurement. This can impact the accuracy of the experimental results.
c. Impact on slope of best-fit line:
The Beer's Law plot is a graphical representation of the relationship between absorbance and concentration of a solution. The slope of the best-fit line generated from this plot represents the molar absorptivity of the absorbing species in the solution. If the error described above results in a lower absorbance measurement for known solution #5, this will impact the slope of the best-fit line. The slope will be lower, indicating that the molar absorptivity of the absorbing species is also lower than expected. This can impact the accuracy of the experimental results and make it difficult to interpret the data.
In conclusion, the error of expelling the last drop of the stock solution into the flask can have significant impacts on the final concentration of the solution, the absorbance measurement, and the slope of the best-fit line generated from the absorbance measurements. It is important to accurately measure the volume of the stock solution to avoid these errors and ensure the accuracy of the experimental results.
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jose is studying atomic particle physics and wants to focus on particles that are found outside of the nucleus of an atom. which particles should he focus on? a. photons b. protons c. neutrons d. electrons
Jose should focus his study on Particles called Electrons present outside the nucleus of an atom. option (d)
Atom is defined as the smallest particle of matter and is composed of subatomic particles protons, Neutrons and Electrons. Protons have a positive charge and Neutrons have neutral charge; they are concentrated at the Nucleus. Electrons are electrically negative and spin around the Nucleus in specialized pathways called Orbits or shells.
The Atom is electrically neutral due to equal number of Protons and Electrons. Nucleus has a positive charge so negatively charged electrons are attracted to the positive core or Nucleus. The number of electrons in orbit is in increasing order of energy level. The orbits near the nucleus have less number of electrons and this is called the Principal Quantum Number.
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Explain what happens in:a. RBC with 10% NaCl.b. RBC with 0.9% NaCl.c. RBC with 0.1% NaCl.
a. In RBC with 10% NaCl, the concentration of sodium chloride is much higher than the normal concentration in blood, causing the red blood cells to shrink and become crenated due to osmotic pressure.
b. In RBC with 0.9% NaCl, the concentration of sodium chloride is close to the normal concentration in blood, resulting in little to no change in the shape or size of the red blood cells.
c. In RBC with 0.1% NaCl, the concentration of sodium chloride is much lower than the normal concentration in blood, causing the red blood cells to swell and become distorted due to osmotic pressure.
What is the effect of 10% NaCl on RBC?The effect of 10% NaCl on RBC is that it causes the water to move out of the RBC and into the solution, resulting in the RBC shrinking and becoming crenated due to the high concentration of salt compared to the concentration inside the RBC.
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a student incorrectly names a compound as 4,6-diethyl-5-heptene. the correct iupac name of this compound is ________.
5-Ethyl-3-methyloct-3-ene is the IUPAC name of the substance. Alkenes are organic substances with a functional group made up of a carbon-carbon double bond. Alkenes can be named according to a logical set of rules, just like any other chemical substance.
According to this iupac method, the names of organic compounds are written using the IUPAC names of alkanes, which are straight-chain molecules containing all of the carbon atoms. An analog alkane or similar alkane is one such substance. The structure, common name, and IUPAC name of each of these alkane's atoms are listed below. The main benefit of a method is that it does not require memorizing the names of all organic compounds; instead, it just requires remembering a few rules and the names of the aforementioned alkanes.
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one way to analyze for the amount of phosphorus in a rock is to precipitate the phosphorus as mgnh4po4, which is then heated to tum it into mg2p2o7. what mass of mg2p2o7 will be obtained from a 2.087 g sample of a rock that contains 86.52% ca3(po4)2 (and no other source of phosphorus) if this analysis is done? hint: you will not be able to write an equation for this problem.
The mass of [tex]Mg_2P_2O_7[/tex] that will be obtained would be 0.22 grams
Stoichiometric problemThe equation of the reaction is as below:
[tex]2MgNH_4PO_4 -- > Mg_2P_2O_7 + 2NH_3 + H_2O[/tex]
The mole ratio of [tex]MgNH_4PO_4[/tex] and [tex]Mg_2P_2O_7[/tex] is 2:1.
2.087 g sample of [tex]MgNH_4PO_4[/tex] contains 86.52% Ca3(PO4)2.
The actual amount of [tex]MgNH_4PO_4[/tex] = 2.087 - (0.8652x2.087) = 0.2813 grams
Mole of 0.2813 grams [tex]MgNH_4PO_4[/tex] = 0.2813/137.315 = 0.002mol
Equivalent mole of [tex]Mg_2P_2O_7[/tex] produced = 0.002/2 = 0.001 mol
Mass of 0.001 mol [tex]Mg_2P_2O_7[/tex] = 0.001 x 222.55 = 0.22 grams
In other words, the mass of [tex]Mg_2P_2O_7[/tex] that will be obtained from a 2.087 g sample of a rock that contains 86.52% Ca3(PO4)2 would be 0.22 grams.
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water was boiled in a beaker. the mass of the water remaining in the beaker was measured and graphed. how many moles of water vaporized during the first five minutes?
The number of moles of water that vaporized during the first five minutes would be 2.78 moles (50 g / 18 g/mol = 2.78 moles).
What is moles?Moles are a kind of small mammal found in many parts of the world. They are burrowing animals, living underground in burrows and tunnels. They have adapted to life underground and have physical features that help them survive in this environment, such as small eyes and ears, short legs and strong claws. They feed mainly on grubs, worms, and other small invertebrates found underground. They also eat some plant material and occasionally small animals. Moles are solitary animals and live in small family groups. They play an important role in the ecosystem, aerating and fertilizing the soil.
In order to calculate the number of moles of water that vaporized during the first five minutes, we must first calculate the mass of water vaporized during the same time period. This can be done by subtracting the mass of water remaining in the beaker after five minutes from the initial mass of water in the beaker. Once the mass of water vaporized is determined, it can then be converted to moles using the equation mass (g) = moles x molar mass (g/mol).
Assuming the initial mass of water in the beaker was 100 g, and the mass of water remaining in the beaker after five minutes was 50 g, the mass of water vaporized during this time period would be 50 g. To convert this to moles, we would use the equation mass (g) = moles x molar mass (g/mol). Since the molar mass of water is 18 g/mol, the number of moles of water that vaporized during the first five minutes would be 2.78 moles (50 g / 18 g/mol = 2.78 moles).
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What is the bond order of CO group?
a. 1
b. 2.5
c. 3.5
d. 3
e. None of the above/more than one of the above
3 is the bond order of CO group. Option d is correct alternative.
A bond order is a measure of the number of chemical bonds between two atoms in a molecule. In a molecule, the bond order is calculated by 1/2 *(numbers of electron in bonding - number of electron antibonding)
In the case of CO, the carbon atom forms a triple bond with the oxygen atom.
Considering, the molecular orbital electronic configuration of CO molecule,
here number of electron bonding is 10
number of electron antibonding is 4
so the bond order is = (10-4)*1/2= 3
So the bond order of CO molecule is 3.
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the answer to the calculation below with the correct number of significant figures is (4.16 x 10^3 + 2.58 x 10^2) / (5.377 x 10^4)
The answer to the calculation is 0.0775 with 3 significant figures.
define significant figures ?
Significant figures are the digits in a number that carry meaning contributing to its measurement precision. They are used to express the precision of a measurement or calculation result. Significant figures include all digits except for leading and trailing zeros, and zeros used to fill in the decimal portion of a number that is not an exact multiple of 1. In mathematical operations, the precision of the final result should be rounded to the least precise measurement or to the appropriate number of significant figures.
The answer to the calculation is 0.0775 with 3 significant figures.
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