The law that demonstrates this observation is the law of definite proportions.
Law of definite proportion states that a given chemical compound continually incorporates its element factors in constant ratio (with the aid of using mass) and does now no longer rely on its supply and technique of preparation. Law of Definite Proportions states that during a given kind of chemical substance, the factors are continually blended withinside the identical proportions with the aid of using mass. The Law of Definite Proportions applies while factors are reacted collectively to shape the identical product. Such as , a sample of an unknown substance contains 24. 0 grams of carbon and 2. 0 grams of hydrogen.
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Suppose that a chemist combines 231 mL of methane and 907 mL of chlorine at STP in a 2.00 L flask. The flask is then allowed to stand at 298 K. If the reaction reaches 75.9% completion, what is the total pressure in the flask
The total pressure in the flask is 1.320 times the total pressure.
What is pressure?Pressure is an important concept in chemistry, as it affects the physical behavior of gases and solids, and the rates at which reactions occur. Pressure is a measure of the force applied to an area, typically expressed in units of atmospheres (atm), or kilopascals (kPa).
Methane :
Mole fraction of methane = (231 mL / 2.00 L) = 0.1155
Partial pressure of methane = 0.1155 * Ptotal
Chlorine:
Mole fraction of chlorine = (907 mL / 2.00 L) = 0.4535
Partial pressure of chlorine = 0.4535 * Ptotal
Products:
Mole fraction of products = (75.9% com) = 0.759
Partial pressure of products = 0.759 * Ptotal
Total pressure = 0.1155*Ptotal + 0.4535*Ptotal + 0.759*Ptotal = 1.320*Ptotal
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(HURRY) Watch the Candy Shop video. In this reaction, a student determined that the mass of the carbon product was less than the mass of the sulfuric acid and sugar that were combined. How would you account for this loss of mass? Use evidence and scientific reasoning to support your answer
The loss of mass can be accounted for by the energy released during the reaction. When the sulfuric acid and sugar mix, the reaction produces carbon dioxide gas, which has a much lower mass than the original reactants. This is because the reaction releases energy as heat, which causes the molecules to break apart and form the gaseous carbon dioxide.
What is molecule?Molecule is the smallest unit of a substance that has all the properties of that substance and is made up of two or more atoms bonded together. Molecules can either be made of elements or a combination of elements and compounds. Molecules can be described as the building blocks of matter, made up of atoms. Atoms are made up of protons, neutrons, and electrons, and the arrangement of these particles determine the type of molecule.
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Prior to Thomson's discovery, the atom was thought to be indivisible. Explain the significance of Thomson's concept of the electron.
In 1897, J.J. Thomson's discovery of the electron was revolutionary.
What is thomson's concept?Thomson's concept of the electron showed that the atom was not indivisible, but instead was composed of smaller particles. This discovery provided the first piece of evidence to support the atomic theory, which states that all matter is made up of atoms.
Thomson's concept of the electron also allowed scientists to understand the behaviour of electricity better. Electrons are negatively charged particles, and Thomson's discovery showed that electricity is a flow of electrons. This knowledge allowed scientists to create new technologies based on the understanding of electrons, such as computers and cell phones.
The significance of Thomson's concept of the electron can be summed up in three words: evidence, electricity, and technology. Thomson's discovery provided the first piece of evidence for the atomic theory, allowed for a better understanding of electricity, and paved the way for the creation of many new technologies.
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The statement "atoms have a small, dense nucleus" is true. What evidence do scientists use to prove this statement as true?
Most alpha particles shot at gold foil go straight through, without any changes in their direction.
The particles ejected in Thomson's experiment bent away from the negatively charged plates, but toward positively charged plates.
A few alpha particles shot at gold foil bounce in the opposite direction
No matter which element Thomson put in a cathode ray tube, the same negative particles with the same properties (such as charge and mass) were ejected.
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, the correct option is option C.
What is atom?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.
In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron.
The statement "atoms have a small, dense nucleus" is true. A few alpha particles shot at gold foil bounce in the opposite direction is the evidence.
Therefore, the correct option is option C.
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Everyone!
Give a Question/Problem for Hot and Cold Compress Pillow
Thank you!!
Answer:
are u good at geometry math? their are some questions I didn't understand it PLEASE
If you double the total amount of Na ions, but you also double the amount of water they are dissolved in, __________.
Na ion concentration will remain constant if you increase the overall number of Na ions while also increasing the volume of water in which they are dissolved.
The amount of material in a certain area is referred to as concentration in chemistry. Another definition states that concentration is the ratio of a solution's solute to its entire solution or solvent. Mass per unit volume is a common way to express concentration. However, moles or units of volume can also be used to express the solute concentration. Concentration could be per unit mass instead of volume. Concentration can be computed for any mixture, despite often being used with chemical solutions.
By mathematically dividing the mass, moles, or volume of the solute by the mass, moles, or volume of the solution, one may calculate the concentration (or, less commonly, the solvent).
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Problems that can be caused by both the complete and incomplete
combustion of methane in a gas fire.
Answer:
carbon dioxide produced, or carbon monoxide, soot produced and Soot can cause breathing problems and it blackens buildings.
Explanation:
During complete combustion carbon and hydrogen combine with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O). During incomplete combustion part of the carbon is not completely oxidized producing soot or carbon monoxide (CO).
Complete this Lewis structure for S2O32− by adding lone pairs and formal charges.
Add lone-pair electrons and formal charges to this structure.
The complete lewis structure is shown in the below figure by adding lone pairs and formal charges.
Assign the valence electrons to each atom as dictated by the periodic table placing one electron at each compass direction and then pairing them only after the first four until you have place all of the atom’s valence electrons. (See the Roman numeral above the group/column it is in.)
Arrange the remaining atoms around the central atom and join them to the central atom by a single bond. The more electronegative atoms are typically farther away from the center and attaching hydrogen last is advised.
Lone electrons (not lone pairs) indicate an ability to form more covalent bonds, resulting in either double or triple bonds. Their presence or the lack of a full octet on any atom indicates there is a better Lewis structure.
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Express the answers to the following operations with the proper number of significant figures.
4. 108 x 5. 3
____ X 10^
The answer to the given operations with proper number of significant figures is 5.7 × 10².
Significant figures or numbers can be defined as those particular numbers or digits which are essential in determining the accuracy of a particular value. For example, 4.392 has 4 significant figures.
When we are rounding off a number to write it with the proper number of significant figures, we first need to decide the amount of significant figures that it should have.
On calculating the given operation,
⇒ 108 × 5.3 = 572.4
In significant figures,
= 5.72 × 10²
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Molecular iodine, i2(g), dissociates into iodine atoms at 625 k with a first-order rate constant of 0. 271 s−1. Part a part complete what is the half-life for this reaction?
After solving the equation: The half-life for this reaction is 0.693/0.271 = 2.56 s.
What is reaction?Reaction is the response of a system to an external or internal stimulus. It is the way a person or object behaves in response to a change in their environment. Reactions can be physical, chemical, or psychological. Physical reactions involve changes in the body, such as muscle tension, sweating, or heart rate.
The half-life for this reaction is the time it takes for the concentration of molecular iodine to decrease by a factor of 2, or for half of the original amount of molecular iodine to react. This can be calculated using the equation:
T1/2 = 0.693/k
where k is the first-order rate constant.
Therefore, the half-life for this reaction is 0.693/0.271 = 2.56 s.
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Why don't we draw a double bond between the Be and Cl atoms in the Lewis structure for BeCl2? a. That would give each Cl a positive formal charge and the Be a negative formal charge b. There aren't enough electrons in the molecule to do so. c. That would result in an expanded octet for beryllium.
d. That would result in an expanded octet for chlorine.
Lone electron pairs are absent from the Be atom. A negative formal charge would be placed on the Be atom as a result of the double bonds existing between it and the Cl atom.
Why is it necessary to go over the formal charges that each atom has in the Lewis diagram?When compared to an isolated neutral atom, the number of electrons that are attached to an atom in a molecule determines its formal charge.
Why is the octet rule broken by becl2?The octet rule is broken by B e C l 2, as the boron should be in a valence state that enables it to attach to three chlorines. However, in this molecule, the boron is joined by six electrons.
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What is the molecular formula of a compound that has an empirical formula of CH2O and a molar mass of 120.12 g/mol
The molecular formula of a compound that has an empirical formula of CH₂O and a molar mass of 120.12 g/mol is C₄H₈O₄.
A molecular formula shows the number of different types of atoms that are present in a molecule whereas an empirical formula represents the simplest whole number ratio of the different atoms present in a molecule.
Given,
empirical formula= CH₂O
molar mass = 120.12 g/mol
To find: molecular formula
we know that,
atomic mass of carbon= 12 g/mol
atomic mass of hydrogen= 1g/mol
atomic mass of oxygen= 16 g/mol
molar mass of CH₂O
= (12+ 1×2 + 16) g/mol
=30 g/mol
therefore, molecular formula
⇒(CH₂O )n = 120.12
⇒30 n= 120.12
⇒n=120.12/30
⇒n= 4.004
⇒n≈4
Thus,
(CH₂O )n = (CH₂O )4 =C₄H₈O₄
Hence, molecular formula is C₄H₈O₄
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How many atoms of K are present in 195. 49 grams of K?
O 3. 0110 x 1024
O 6. 0220 x 1024
O 1. 1772 x 1026
0 4. 5797 x 1027
The number of K atoms present in 195.49 grams of K is 3.0110 × 10²⁴ atoms. The correct option is a 3.0110 x 10²⁴.
We are to determine the number of K atoms present in 195.49 grams of K.
First, we will determine the number of moles K present
number of moles =[tex]\frac{mass}{molar mass}[/tex]
Atomic mass of K = 39.0983 g/mol
Number of moles of K present = [tex]\frac{195.49}{39.09}[/tex]
Number of moles of K present = 4.99996 moles
Number of moles of K present ≅ 5 moles
Now, for the number of atoms present
From the formula
Number of atoms = Number of atoms × Avogadro's constant
Number of K atoms present = 5 × 6.022 × 10²³
Number of K atoms present = 5 × 6.022 × 10²³
Number of K atoms present = 30.11 × 10²³
Number of K atoms present = 3.0110 × 10²⁴ atoms
Hence, the number of K atoms present in 195.49 grams of K is 3.0110 × 10²⁴ atoms. The correct option is a 3.0110 x 10²⁴.
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The reaction of solid sodium metal with gaseous diatomic chlorine produces common table salt and lots of heat. The chemical equation for this reaction is best written as
The chemical equation for this reaction is best written as: Na (s) + Cl2 (g) → NaCl (s) + Heat
What is reaction?Reaction is a process in which one or more substances are changed into one or more different substances. It is a chemical or physical change that occurs in response to a stimulus. Reactions can be used to create new materials or to break down existing materials into simpler components. They can also be used to generate energy or to store energy. Reactions can be either spontaneous or non-spontaneous, depending on the conditions in which they occur.
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Why is bromine the most reactive?
Being a highly chemically reactive metal having seven valence electrons and even a high attraction for electrons, bromine reacts quickly as well as violently with alkali metals, therefore is rarely found in nature pure.
Despite being a potent oxidizer, it is difficult to break down under typical circumstances. Fluorine was the strongest active halogen, followed by chlorine, bromine, as well as iodine.
Since bromine has a higher atomic radius over chlorine, it is much less reactive. Compared to chlorine, bromine does not hold electrons as tightly. This is supported by the fact that chlorine contains fewer electron shells, which causes the electrons to connect nearer to the nucleus.
Due to its lower reactivity, the bromine radical is so much more selective for such 2° radical. Cl• is much less picky and less selective since it is less stable as well as more reactive.
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Cobalt-60 is a beta emitter with a half-life of 5.3 years. Approximately what fraction of cobalt-60 atoms will remain in a particular sample after 26.5 years
The fraction of cobalt-60 atoms remaining after 26.5 years is approximately 0.25 (1/4).
What is atom?An atom is the smallest unit of matter that still retains its properties. It consists of a nucleus, which is made up of protons and neutrons, surrounded by electrons that orbit the nucleus. Atoms are the building blocks of all matter and can combine to form molecules. Atoms are also constantly in motion and can be found in everything from air to rocks. They are essential for life, as they make up all the molecules that form the cells and organs in the human body.
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CH4 + 2 Cl₂ →→ 4 HCl + C
4. Use the equation above to calculate how many moles of CH4 are required to
produce 3.6 moles of HCl. (2 pts)
By using given equation 0.9 moles of CH₄ are required to produce 3.6 moles of HCl.
In simple terms, what is a chemical reaction?The transformation of one or more reactants, also known as reactants, into one or more new products, also known as products, occurs during a chemical reaction.
Chemical reactions turn reactants into products by involving reactants in the process. As an illustration, when we breathe, oxygen is inhaled, and upon coming into contact with glucose, it reacts to create carbon dioxide, water, and energy.
Given chemical reaction:
CH₄ + 2 Cl₂ → 4 HCl + C
1 mole of CH₄ gives 4 moles of HCl
x moles of CH₄ gives 3.6 moles
x moles of CH₄ = 3.6/4
x moles of CH₄ = 0.9moles.
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In this redox reaction, identify the element that was reduced. Fe2O3 3CO 2Fe 3CO2 A. C B. CO C. Fe D. FeO E. O
the element that was reduced in this redox reaction is Fe
A redox reaction, also known as an oxidation-reduction or redox reaction, involves the exchange of electrons between chemical entities (the atoms, ions, or molecules involved in the reaction). Redox reactions occur everywhere; they are involved in the burning of fuels, the rusting of metals, and even the processes of photosynthesis and cellular respiration.Some species experience oxidation, or the loss of electrons, while others experience reduction, or the gain of electrons, during a redox process. Take rust, which results from the interaction of iron and oxygen:The third selection from the options presented above is the right response. The element that was reduced in the described redox reaction was Fe, or iron. It now has a neutral charge after having its +3 charge lowered.
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Hydrogen bonds are an especially strong type of dipole-dipole interaction What are oil and water examples of
An exceptionally potent type of dipole-dipole interaction is hydrogen bonding. Oil and water are examples of the effects of hydrogen bonding.
Hydrogen bonding are a type of dipole-dipole interaction that occur between the hydrogen atoms of one molecule and the nitrogen or oxygen atoms of another molecule. They are relatively strong interactions, about 5-10% as strong as a covalent bond, and are responsible for the unique properties of many biological molecules, such as DNA and proteins. Oil and water are examples of substances that demonstrate the effects of hydrogen bonding. Water molecules are polar, meaning that they have a partial positive charge on the hydrogen atoms and a partial negative charge on the oxygen atoms. This polarity allows water molecules to form hydrogen bonds with one another, giving water its high surface tension and making it a good solvent for polar substances. Oil, on the other hand, is composed of non-polar molecules such as alkanes and alkenes, which do not form hydrogen bonds with one another. As a result, oil is immiscible with water and will float on top of it, because it does not have the same kind of attractive forces between its molecules as water does, and also the oil molecules have a low polarity. In summary, hydrogen bonds are a type of dipole-dipole interaction that are relatively strong, and oil and water are examples of substances that demonstrate the effects of hydrogen bonding. Water molecules can form hydrogen bonds with one another, giving it the properties of high surface tension and making it a good solvent for polar substances, while oil is composed of non-polar molecules and it is immiscible with water, having low polarity.
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Balance the following equation. Do
H₂+NO → H₂O + N₂
✓
V
V2 + 2NO → 2H2O + N2 The equation is balanced by adding an additional coefficient (2) to the hydrogen (H2) and water (H2O) molecules on the product side.
What is balanced?Balanced is a term used to describe a state of equilibrium or harmony. It implies a situation where all elements are in proportion and none are out of place or dominant. This could describe a healthy diet that provides a balance of proteins, carbohydrates, and fats, or a successful family life where time is shared between work, play, and private activities. Balance is also a key factor in physical and mental health, when all aspects of life are in alignment it allows for a more fulfilling and enjoyable experience.
This ensures that the number of atoms of each element is equal on both sides of the equation. In other words, the number of atoms of hydrogen (H2) and water (H2O) molecules on the left side of the equation must be equal to the number of atoms of hydrogen (H2) and water (H2O) molecules on the right side of the equation.
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A principle of value stream mapping is to concentrate on speeding up value-added operations.
True/False
False. Value streaming mapping technique is used to analyze the flow of information, people and material required to bring a product to a consumer.
The value stream mapping is a series of steps. Value stream mapping provides a structured visualization of the key steps and corresponding data needed to understand and intelligently make improvements that optimize the entire process. Value stream is a series of steps that occur to provide the product or service that customers wants. Value stream mapping enables us to understand where the value is added, where it’s not and more importantly, how to improve upon the collective process.
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If an automobile air bag has a volume of 11.8 L, what mass of (in g) is required to fully inflate the air bag upon impact
22.3 g of NaN₃ are required to fully inflate an airbag of 11.5 L at STP.
What is decomposition reaction?Chemical decomposition, also known as chemical breakdown, is the process of breaking down a single chemical entity into two or more components. Chemical breakdown is commonly thought of and characterized as the inverse of chemical synthesis. When one reactant breaks down into two or more products, this is referred to as a decomposition reaction. This is expressed by the following generic equation: AB A + B. The breakdown of hydrogen peroxide to water and oxygen is an example of a decomposition process, as is the breakdown of water to hydrogen and oxygen.
Here,
In airbags, sodium azide decomposes to form sodium and nitrogen gas, which inflates the bag. The decomposition reaction is:
2 NaN₃ ⇒ 2 Na + 3 N₂
We can calculate the mass of NaN₃ needed to produce 11.5 L of N₂ at STP, using the following relations.
At STP, 1 mole of N₂ occupies 22.4 L.
The molar ratio of N₂ to NaN₃ is 3:2.
The molar mass of NaN₃ is 65.01 g/mol.
=11.8*1/22.4*2/3*65.01/1
=118/112*21.67
=22.82 g
22.3 g of NaN₃ are required to fully inflate an airbag of 11.5 L at STP.
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Select the correct answer.
How does substituting a hydrogen atom with a halogen in a hydrocarbon affect the resulting compound?
A.
All the single bonds in the original molecule change to double bonds.
B.
The boiling point of the new compound increases.
C.
The bonds between the carbon atoms in the molecule become weaker.
D.
The resulting compound is called a saturated hydrocarbon.
E.
The substitution allows each carbon atom to accept more than four valence electrons.
Answer:
E. The substitution allows each carbon atom to accept more than four valence electrons.
Explanation:
Halogens (except for fluorine) have seven valence electrons, which gives them the flexibility to participate in more than four covalent bonds. Hydrogen only has one valence electron, so it tends to form only four covalent bonds. In a substitution reaction, each halogen provides the carbon atom with additional electrons, allowing it to accept more than the usual four.
Answer:
C. The bonds between the carbon atoms in the molecule become weaker.
Explanation:
What is the definition of meter in biology?
The definition of the meter in biology is that the meter scale is used to measure the length. it is first unit of the international system of the units.
The meter is the first unit of the length in the international system of the units. currently the definition of the meter is : The meter can be defined as the length of the path that is travelled by the light in the vacuum during the time interval of 1 / 2999792458 second. The symbol of the meter is m.
The meter scale is used to measure the length or the distance between the two points.
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In a typical IR spectrum, what name describes the units shown on the x-axis? a. wavenumber b. relative abundance c. %transmittance d. ppm e. intensity
In a typical IR spectrum, wavenumber name describes the units shown on the x-axis.
According to common understanding, IR includes wavelengths between the notional red edge of the visible spectrum, which is at a frequency of 430 THz, and 1 millimeter (300 GHz) (although the longer IR wavelengths are often designated rather as terahertz radiation ).The spatial frequency of a wave is measured in cycles per unit distance (common wavenumber) or radians per unit distance, and is also known as the wavenumber or repetency[1] (angular wavenumber).It is comparable to temporal frequency, which is determined by the quantity of radians or wave cycles per unit of time (ordinary frequency) (angular frequency).
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18) Write the expression: the sum of the quantity h and 2 divided by 4. A) h 4 2 B) h 2 4 C) h 2 4 D) 4 h 2
The expression is [tex]\frac{(h+2)}{4}[/tex] which can be solved by BODMAS rule
The abbreviation BODMAS, which stands for "Brackets, Order of powers or roots, Division, and Multiplication," is followed by the BODMAS rule. A stands for addition and S for subtraction. According to the BODMAS rule, multi-step mathematical statements must be solved in the BODMAS order from left to right. Similar to how Addition and Subtraction depend on which comes first in the sentence, Division and Multiplication are thought of as interchangeable operations.
The expression can be written as follows WE have 2 quantities h and 2
Their sum can be written as h+2 Now We have the sum divided by 4 so it can be written as : [tex]\frac{(h+2)}{4}[/tex]
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What do we use a meter stick to measure?
A meterstick is used to measure things in meters and centimeters.
Meterstick is the measurement tool that measures one meter (hundred centimeters) and is used to measure the things in meters and centimeters. Metersticks are often rectangular and tin, and it is made up of wood or metal. Metal ones are often backed with a 'grippy' material such as cork, to improve the friction. Metersticks are usually divided within the lines for each millimeter (1000 per meter) and the numerical markings as per centimeter (100 per meter), with the numbers either in centi- or millimeter. It is a large ruler used for measuring the size or the distance using the metric scale.
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Carefully feel the sides of the flask. Is the crystallization of sodium acetate endothermic or exothermic? How do you know?
Answer:
It is not possible to determine whether the crystallization of sodium acetate is endothermic or exothermic simply by feeling the sides of the flask. To determine the heat of crystallization, you would need to measure the temperature of the solution before and after crystallization and compare the two values.
The heat of crystallization is defined as the heat absorbed or released during the process of crystal formation from a solution or a melt. If heat is absorbed during the process, the reaction is endothermic and the temperature of the solution or melt will decrease. If heat is released, the reaction is exothermic and the temperature will increase.
In the case of sodium acetate, it is an exothermic reaction, meaning that heat is released during crystallization and the temperature of the solution will increase. This is because the process of forming the crystal lattice requires the breaking of hydrogen bonds and other intermolecular forces, which releases energy.
Explanation:
Answer:
exothermic
Explanation:
When you crystallize the solution, sodium acetate forms a new bond from the soluble aqueous state ( Na+ and C2H3O2- ) to the solid state (NaC2H3O2). Forming bonds in chemistry is generally an exothermic reaction.
How many moles are there in 10g?
Answer:
0.25 moles
Explanation:
What is the mass of 2.80 x 10 ^23 molecules of CO2?
The answer is 20.46g.
As we know that
1 mole of CO2 has 6.02 x 10^23 molecules of CO2.
Now, let's say x moles of CO2 has 2.80 x 10^23 molecules of CO2.
Therefore,
x = 2.80 x 10^23 / 6.02 x 10^23 = 0.465
As, M = nmr
M = 0.465 *( 12 + 2x16)
= 0.465 *( 12 + 32)
= 0.465 * 44
= 20.46g