Answer: The stoichiometric coefficient of [tex]O_2[/tex] is 3.
Explanation:
Every balanced chemical equation follows Law of conservation of mass.
This law states that mass can neither be created nor be destroyed, but it can only be transformed from one form to another form.
This also means that the total number of individual atoms on the reactant side must be equal to the total number of individual atoms on the product side.
For the balanced chemical equation:
[tex]C_2H_6O(l)+3O_2(g)\rightarrow 2CO2(g)+3H_2O(l)[/tex]
On reactant side:
Number of Carbon atoms = 2
Number of Hydrogen atoms = 6
Number of Oxygen atoms = 7
On product side:
Number of Carbon atoms = 2
Number of Hydrogen atoms = 6
Number of Oxygen atoms = 7
Hence, the coefficient of [tex]O_2[/tex] in the balanced chemical equation is 3.
A chemical equation is said to be balanced if the quantity of each type of atom in the reaction is the same on both the reactant and product sides. In a balanced chemical equation, the mass and the charge are both equal. Here the stoichiometric coefficient for oxygen is 7.
A balanced chemical equation, in which the masses of the reactants and products are equal, contains the same amount of atoms of each element on both sides of the equation. In other words, both sides of the reaction have an equal balance of mass and charge.
The number in front of the formula is the coefficient in chemistry. The coefficient reveals the number of molecules in a specific formula.
Here the balanced equation is:
2C₂H₆ +7O₂ → 4CO₂+ 6H₂O
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What are the benefits of stationary weather collection
Calculate the formula mass for the compound tin(IV) sulfate.
Write the complete electron configuration for the common monatomic ion formed by the element calcium, ca.
The complete electron configuration for the common monatomic ion formed by calcium (Ca) is [Ar]4s².
Explanation:Calcium (Ca) is located in the second column of the s block. We would expect its electron configuration to end with 4s². The complete electron configuration for calcium is [Ar]4s². When calcium forms a monatomic ion, it loses its two valence electrons, resulting in a 2+ charge and an electron configuration of 1s²2s²2p⁶3s²3p⁶. The calcium ion (Ca²+) is therefore isoelectronic with the noble gas argon (Ar).
Which product(s) would be obtained by the dehydration of 2-heptanol? of 2-methyl-l-cyclohexanol?
The dehydration of 2-heptanol would yield 2-heptene as the major product along with 1-heptene as a minor product, while the dehydration of 2-methyl-1-cyclohexanol would yield 1-methyl-1-cyclohexene as the major product along with other isomeric alkenes as minor products.
The products obtained by the dehydration of 2-heptanol and 2-methyl-1-cyclohexanol can be predicted based on the rules of alkene formation during dehydration reactions.
For 2-heptanol, the dehydration follows Zaitsev's rule, which states that the more substituted alkene is the major product. In this case, dehydration of 2-heptanol would yield a mixture of alkenes, with the most substituted alkene, 2-heptene, as the major product, and the less substituted alkene, 1-heptene, as a minor product. The reaction can be represented as follows:
[tex]\[ \text{CH}_3\text{CH}(\text{OH})\text{CH}_2\text{CH}_2\text{CH}_2\text{CH}_3 \rightarrow \text{CH}_3\text{CH}=\text{CHCH}_2\text{CH}_2\text{CH}_3 + \text{CH}_3\text{CH}_2\text{CH}=\text{CHCH}_2\text{CH}_3 \][/tex]
For 2-methyl-1-cyclohexanol, the dehydration would also follow Zaitsev's rule. However, since the hydroxyl group is on a cyclohexane ring, the dehydration would lead to the formation of an alkene within the ring. The most substituted alkene that can be formed is 1-methyl-1-cyclohexene. The reaction can be represented as follows:
[tex]\[ \text{C}_6\text{H}_{11}\text{CH}(\text{OH})\text{CH}_3 \rightarrow \text{C}_6\text{H}_{11}\text{C}(\text{CH}_3)=\text{CH}_2 + \text{isomeric alkenes} \][/tex]
In summary, the dehydration of 2-heptanol would yield 2-heptene as the major product along with 1-heptene as a minor product, while the dehydration of 2-methyl-1-cyclohexanol would yield 1-methyl-1-cyclohexene as the major product along with other isomeric alkenes as minor products.
The instrument that is commonly used to measure the intensity of radioactivity is called a _____.
How much water must be added to 12.0 mL of 1.65 M LiCl to dilute the solution to 0.495 M LiCl?
To solve this problem, we use the formula:
M1 V1 = M2 V2
To calculate for the total final volume V2:
V2 = M1 V1 / M2
V2 = 1.65 M * 12 mL / 0.495 M
V2 = 40 mL
Since final volume is 40 mL so water needed is:
water volume = 40 mL – 12 mL
water volume = 28 mL
A neutral atom of potassium (K) has an average mass of 39 amu and 19 electrons. How many neutrons does it have?
10
19
20
58
A neutral atom of potassium (K) has an average mass of 39 amu and 19 electrons. It has 20 neutrons. Thus, the correct option for this question is C.
What are Electrons?Electrons may be characterized as the type of subatomic particles which are consistently revolving within the orbitals around the nucleus. These subatomic particles are negatively charged in nature. J.J. Thomson is known as the discoverer of these subatomic particles.
It is clearly mentioned in the question that an atom is neutral which means the number of positively charged particles (protons) is equal to the number of negatively charged particles (electrons). So, the number of protons is also 19.
Now, the number of neutrons is determined by the following formula:
The number of neutrons = Atomic mass - Number of protons.
= 39 - 19 = 20.
Therefore, a neutral atom of potassium (K) has an average mass of 39 amu and 19 electrons. It has 20 neutrons. Thus, the correct option for this question is C.
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Which best defines partial pressure in a mixture of gases?
pressure that is exerted by all the gases of a mixture on the container
pressure that is exerted by one gas as if it occupied a container by itself
half of the pressure that is exerted by the gases of a mixture on the container
sum of the individual pressures that are exerted by two or more gases
Pressure that is exerted by one gas as if it occupied a container by itself
Explanation;Partial pressure refers to the pressure exerted by an individual gas in a mixture of gases.According to Dalton's law of partial pressure, the total pressure of a mixture of gases is equivalent to the sum of the partial pressures of the component gases.Therefore; The partial pressure of one gas in a mixture of gases, contained in a given volume, is the pressure that one gas would exert if it occupied the entire volume all by itself.Considering the Dalton's partial pressure, the correct answer is the second option: "pressure that is exerted by one gas as if it occupied a container by itself" defines partial pressure in a mixture of gases.
Dalton's lawThe pressure exerted by a particular gas in a mixture is known as its partial pressure.
So, Dalton's law states that the total pressure of a gas mixture is equal to the sum of the pressures that each gas would exert if it were alone:
[tex]P_{T}=P_{1} +P_{2} +...+P_{n}[/tex]
where n is the amount of gases present in the mixture.
This relationship is due to the assumption that there are no attractive forces between the gases.
Dalton's partial pressure law can also be expressed in terms of the mole fraction of the gas in the mixture. The mole fraction is a dimensionless quantity that expresses the ratio of the number of moles of a component to the number of moles of all the components present.
So in a mixture of two or more gases, the partial pressure of gas A can be expressed as:
[tex]P_{A} =x_{A} P_{T}[/tex]
In summary, the correct answer is the second option: "pressure that is exerted by one gas as if it occupied a container by itself" defines partial pressure in a mixture of gases.
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what is one difference between a cell wall and a cell membrane
SELECT ALL THAT APPLY. Which of the following statements about Charles's law are true?
A. Real gases may be expected to deviate from Charles's law at high pressures.
B. Ideal gases may be expected to deviate from Charles's law at high pressures.
C. Real gases may be expected to deviate from Charles's law near the liquefaction temperature.
D. Ideal gases may be expected to deviate from Charles's law near the liquefaction temperature.
Answer is:
A. Real gases may be expected to deviate from Charles's law at high pressures.
C. Real gases may be expected to deviate from Charles's law near the liquefaction temperature.
At high pressure gas molecules are close to one another and near the liqueffaction temperature energy is very low.
Charles' Law (The Temperature-Volume Law) - the volume of a given amount of gas held at constant pressure is directly proportional to the Kelvin temperature:
V₁/T₁ = V₂/T₂.
When temperature goes down, the volume also goes down.
Assuming ideal gas behavior, what is the pressure in atm exerted by 1.57 mol Cl2(g) confined to a volume of 1.50 L at 273K?
The formula for ideal gas law is:
P V = n R T
where
P is pressure = ?
V is volume = 1.50 L
n is number of moles = 1.57 mol
R is gas constant = 0.08205746 L atm / mol K
T is temperature = 273 K
P = 1.57 mol * 0.08205746 L atm / mol K * 273 K / 1.50 L
P = 23.45 atm
What is the process that changes the composition of rocks by dissolving them called?
When a soda is poured into a glass and the soda bubbles, is it the result of a chemical change? explain your answer?
Do strong acid and strong base have similar effects on protein solubility and denaturation
The Lewis structure for ethylene, C2H4, is shown. How many valence electrons do the two carbon atoms in the molecule share with each other in the double bond?
the correct answer is 2
Household object that includes metal and why
Retry: 1.Examine Record A. Use the three basic rules to figure out the ages of the layers. In Chart A, list the layers from youngest to oldest with the youngest layer in the first row.
Answer:
C, E, H, A, B, F, K, D, L, G, J, I.
Explanation:
Hello,
In this case we are dating each layer based on its deepness as the deeper the layer is, the farther back in time it is (older). In such a way, the youngest layer is C and henceforth by going down, we find older and older layers no matter if the layer is horizontal or diagonal, we just go down by straight line, therefore, from youngest to oldest, the order turn out into:
C, E, H, A, B, F, K, D, L, G, J, I.
Best regards.
The bond enthalpy in no is 632 kj/mol and that of each no bond in no2 is 469 kj/mol. explain the difference in bond enthalpies between the two molecules. 1. the bond type does not explain the difference. 2. no has a singl
The bond enthalpy is the energy required to break a chemical bond. The bond enthalpy of NO2 is lower than NO because NO2 has a double bond which is stronger and thus requires more energy to break compared to the single bond in NO.
Explanation:The bond enthalpy, or energy, is a measure of the strength of a chemical bond. It is identified by the energy required, in joules or kilojoules per mole (kJ/mol), to break a chemical bond. In this case, we are comparing the bond enthalpy of NO, a molecule with a single bond, and that of NO2, a molecule with double bonds between the atoms.
The bond enthalpy in NO is 632 kJ/mol and that of each NO bond in NO2 is 469 kJ/mol. The difference in bond enthalpies is due to the difference in the number of electron pairs in the bond. The strength of a bond between two atoms increases as the number of electron pairs in the bond increases. Simply put, a single covalent bond (as in NO) is typically weaker than a double bond (as present in NO2), and therefore, requires less energy to break. Hence the bond enthalpy is lower for NO2 as it is harder to break its double bond.
It's important to remember that the exact values of bond enthalpy also depend on the specific atoms in the bond and their electronegativity, which is why there are some discrepancies seen in bond enthalpies in different molecules.
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which has prokaryotic cells
Prokaryotic cells are found in bacteria and archaea.
What is Prokaryotic cellsProkaryotic cells are a type of cell that lacks a nucleus and other membrane-bound organelles. They are found in bacteria and archaea, which are two domains of microorganisms.
Prokaryotic cells are structurally simpler compared to eukaryotic cells, which are found in plants, animals, fungi, and protists.
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Write orbital diagrams (boxes with arrows in them) to represent the electron configurations of carbon before and after sp hybridization.
The electron configuration of carbon atom in its ground state is 1s² 2s² 2p². After sp hybridization, one 2s electron gets excited to the 2p orbital forming four unpaired electrons ready for bonding. These form two sp hybrid orbitals, leaving the remaining two 2p orbitals with single electrons.
Explanation:The electron configuration for a carbon atom (C) in its ground state is 1s² 2s² 2p², represented by an orbital diagram with two arrows in the 1s box, two in the 2s, and two single arrows in two of the three 2p boxes, indicating paired and unpaired electrons respectively.
During sp hybridization, one of the 2s electrons gets excited and moves to the 2p orbital, leading to four unpaired electrons ready for bonding. These mix to form two sp orbitals. In the electron configuration diagram, the two sp hybrid orbitals would have a single electron each, leaving the remain two 2p orbitals also with single electrons. Remember, these are depicted as boxes, each with a single upward arrow.
The distinction between the carbon atom's electron configurations before and after sp hybridization is essential in understanding its bonding behaviour and the formation of diverse organic compounds.
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why is it important to know a tornados velocity and not just its speed
How many cl atoms are in 0.0728 g of pcl3?
The answer is there are 9.57 x 10²⁰ number of Cl atoms are in 0.0728 g of PCl₃.
Number of moles = mass / molar mass
Mass of PCl₃ = 0.0728 g and molar mass of PCl₃ = 137.33g/mol
Number of moles of PCl₃ = 0.0728 / 137.33 = 5.3 x 10⁻⁴
In one mole there are Avogadro’s number of molecules that is 6.02 x 10²³
So, in 5.3 x 10⁻⁴ moles of PCl₃, there are =5.3 x 10⁻⁴ x 6.02 x 10²³ = 3.19 x 10²⁰
Now there is 3 atoms of Cl in PCl₃ so in 3.19 x 10²⁰ molecules of PCl₃, number of Cl atoms = 3.19 x 10²⁰ x 3 = 9.57 x 10²⁰ atoms
To find the number of chlorine atoms in a given mass of PCl3, you calculate the number of moles of PCl3, using its molar mass. Then, multiply the number of moles by three (since there are three chlorine atoms in each molecule of PCl3), and then use Avogadro's number to convert the number of moles to atoms. The resulting number is 9.56 x 10^20 Cl atoms.
Explanation:First, determine the molar mass of PCl3. Phosphorus (P) has an atomic mass of about 31g/mol, and Chlorine (Cl) has an atomic mass of about 35.5 g/mol. Since there are three chlorine atoms in PCl3, the molar mass of PCl3 becomes 31 + 3 * 35.5 = 137 g/mol.
Then, calculate the number of moles in 0.0728 g of PCl3. This is done by dividing the mass of the sample by the molar mass of PCl3: 0.0728 g / 137 g/mol = 0.000531 moles of PCl3.
Since each mole of PCl3 contains three moles of Cl, we multiply the number of moles of the compound by three to get the number of moles of Cl: 0.000531 moles * 3 = 0.00159 moles of Cl.
Then, using Avogadro's number (6.02 x 10^23), we can convert the number of moles to the number of atoms. 0.00159 moles * 6.02 x 10^23 atoms/mol = 9.56 x 10^20 atoms.
So, there are around 9.56 x 10^20 atoms of chlorine (Cl) in a 0.0728 g sample of PCl3.
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When chromium chloride crcl2 is dissolved in water the temperature of the water decreases answers?
which of the following identifies the number and location of protons in a lithium atom
A lithium atom always contains three protons located in its nucleus, defining its atomic number as 3, regardless of the isotope.
Explanation:The number and location of protons in a lithium atom is universally three within its nucleus. This constant feature defines the element lithium (Li) and gives it an atomic number of 3. Lithium atoms can, however, have different numbers of neutrons, resulting in isotopes with different mass numbers such as Lithium-6 (three neutrons) and Lithium-7 (four neutrons). Despite these differences, the number of protons remains constant at three, which is a characteristic trait of the lithium element.
What is the difference between a white and red reaction integumentary system?
In the integumentary system, the white reaction is caused by vasoconstriction, which is the narrowing of blood vessels. The red reaction is caused by vasodilation, which is the widening of blood vessels.
The white reaction and the red reaction are two types of skin reactions that can occur in response to an injury or irritation.
The white reaction is usually a temporary reaction that goes away on its own within a few minutes or hours. The red reaction can last longer, depending on the severity of the injury or irritation. The triple reaction is usually caused by a more severe injury or irritation than the white or red reactions. It can also be a sign of an allergic reaction.
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The integumentary system undergoes changes as a person ages, resulting in a thinner epidermis and slower wound healing. Both the white and red reactions are affected by these changes.
Explanation:The integumentary system undergoes changes as a person ages, leading to a thinner epidermis and slower wound healing. These changes are reflected in both the white and red reactions of the integumentary system. The white reaction refers to decreased mitosis in the stratum basale, resulting in a thinner epidermis. The red reaction relates to the reduced ability of the dermis to regenerate, leading to slower wound healing.
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Which of the following represents a chemical change?
Bending a wire
Freezing of water
Fireworks exploding
Melting of a wax candle
Explosion of fireworks represents a chemical change because explosion causes chemical reaction due to which chemical properties change.
How do chemical changes occur?Chemical changes occur when chemical reactions take place.During chemical reactions, bonds between atoms break due to which properties change.
Bending of wire only causes change in physical property that is shape and there is no change in chemical properties or constituents of wire.Freezing of water changes the state of water to solid but does not change it's properties.
Melting of wax candle only changes the state of candle from solid to molten form it does not alter its chemical properties.During explosion of fireworks there is chemical change taking place along with which large amount of energy is released.
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What are the major species in solution when solid ammonium bromate is dissolved in water?
The major species when ammonium bromate is dissolved in water are ammonium ions, bromate ions, hydronium ions, and ammonia.
When solid ammonium bromate is dissolved in water, the major species in solution are ammonium ions (NH₄⁺) and bromate ions (BrO₃⁻). In an aqueous solution, the ammonium ion is a weak acid, which can donate a proton to water, forming hydronium ions (H₃O⁺) and ammonia (NH₃), hence making the solution slightly acidic. The bromate ion is a stable species that does not further react in water. Therefore, the major species in solution are NH₄⁺, BrO₃⁻, H₃O⁺, and some unreacted NH₃.
What is the de Broglie wavelength (in meters) of a 45-g golf ball traveling at 72 m/s?
If 32.0 g of MgSO4⋅7H2O is thoroughly heated, what mass of anhydrous magnesium sulfate will remain?
After heating, approximately 15.65 g of anhydrous magnesium sulfate will remain from the original 32.0 g of magnesium sulfate heptahydrate.
Identify the Molar Masses:
Molar mass of MgSO₄ = 24.31 (Mg) + 32.07 (S) + 4 × 16.00 (O) = 120.37 g/molMolar mass of 7H₂O = 7 × 18.02 (H₂O) = 126.14 g/molTherefore, the molar mass of MgSO₄·7H₂O = 120.37 g/mol + 126.14 g/mol = 246.51 g/molCalculate the Moles of MgSO₄·7H₂O:
Moles of MgSO₄·7H₂O =Determine the Moles of Anhydrous MgSO₄:
Upon heating, all the water is removed, leaving anhydrous MgSO₄.The moles of anhydrous MgSO₄ are equal to the moles of MgSO₄·7H₂O because heating just removes water.Calculate the Mass of Anhydrous MgSO₄:
Mass of MgSO₄ = Moles × Molar MassDescribe the preparation of 40 liters of 0.02 m phosphate buffer, ph 6.9
By following these steps, you can prepare 40 liters of 0.02 M phosphate buffer with a pH of 6.9 using solid Na3PO4 and 1M HCl:
Step 1: Calculate the amount of Na3PO4 required
Step 2: Prepare the Na3PO4 solution
Step 3: Calculate the amount of HCl required
Step 4: Adjust the pH
To prepare 40 liters of 0.02 M phosphate buffer solution with a pH of 6.9, starting from solid Na3PO4 and 1M HCl, we can follow these steps:
Step 1: Calculate the amount of Na3PO4 required
The phosphate buffer will be prepared using the following equilibrium reaction:
Na3PO4 + 3HCl → 3NaCl + H3PO4
We need to calculate the amount of Na3PO4 required to make a 0.02 M solution in 40 liters.
First, calculate the moles of phosphate ions required:
Moles of phosphate ions = Molarity × Volume
Moles of phosphate ions = 0.02 mol/L × 40 L = 0.8 moles
Since Na3PO4 dissociates into three moles of phosphate ions, the moles of Na3PO4 needed will be one-third of the moles of phosphate ions:
Moles of Na3PO4 = 0.8 moles / 3 = 0.2667 moles
Step 2: Prepare the Na3PO4 solution
Weigh out the calculated amount of Na3PO4 and dissolve it in water to make up the 40 liters of solution.
Step 3: Calculate the amount of HCl required
The pH of the buffer is adjusted using HCl. To achieve a pH of 6.9, we need to calculate the amount of 1M HCl needed.
Step 4: Adjust the pH
Add the calculated amount of 1M HCl to the Na3PO4 solution while monitoring the pH using a pH meter or pH paper. The pH should be adjusted to 6.9 by adding small amounts of HCl at a time and then checking the pH until the desired pH is reached.
By following these steps, you can prepare 40 liters of 0.02 M phosphate buffer with a pH of 6.9 using solid Na3PO4 and 1M HCl.
The probable question may be:
Describe the preparation of 40 liters of 0.02 M phosphate buffer, pH 6.9, starting from solid Na3PO4 and 1M HCl.