Solving the Question
We're given:
[tex]2 NO_{(g)} + O_{2(g)}\rightarrow 2 NO_{2 (g)}[/tex][tex]n_{NO_2}=13.0\hspace{4}mol[/tex][tex]\%\hspace{4}yield=67.1\%[/tex]First, let's calculate the theoretical yield of NO2.
⇒ [tex]\%\hspace{4}yield=\dfrac{actual\hspace{4}yield}{theoretical\hspace{4}yield}[/tex]
The yield of NO2 we must produce is 13.0 mol.
⇒ [tex]\%\hspace{4}yield=\dfrac{13.0}{theoretical\hspace{4}yield}[/tex]
We're also given that the percentage yield of this reaction is 67.1%.
⇒ [tex]0.671=\dfrac{13.0}{theoretical\hspace{4}yield}[/tex]
⇒ [tex]theoretical\hspace{4}yield=\dfrac{13.0}{0.671}\\\\theoretical\hspace{4}yield=19.3740685544\hspace{4}mol[/tex]
First, construct a mole ratio between O2 and NO2.
From the balanced chemical equation, we know that 1 mol of O2 can produce 2 mol of NO2:
⇒ [tex]\dfrac{n_{O_2}}{1}=\dfrac{n_{NO_2}}{2}[/tex]
We're given that we must theoretically produce 19.3740685544 mol of NO2:
⇒ [tex]\dfrac{n_{O_2}}{1}=\dfrac{19.3740685544}{2}[/tex]
⇒ [tex]n_{O_2}=9.6870342772\hspace{4}mol[/tex]
Round to significant figures (3):
⇒ [tex]n_{O_2}=9.69\hspace{4}mol[/tex]
Answer[tex]n_{O_2}=9.69\hspace{4}mol[/tex]
Express 142 in scientific
notation.
Answer:
142 can be expressed in scientific notation as 1.42 x 10².
Explanation:
The strength of mild steel is found to be 232.9 MPa when the grain size is 17.43 pm. and 874.2 MPa when the grain size is 0.80 um. 1. Determine the constants in the Hall-Petch equation. (Express your answer to three significant figures.) K =_____MPa um 0o =______MPa 2. Determine the strength of the mild steel when the grain size is reduced to 0.160 pm. (Express your answer to three significant figures.) 0 = MPa
When the grain size is reduced to 0.160 pm, the strength of mild steel is 1851 MPa.There are a number of variables that can affect mild steel's strength, including the grain size, which is controllable.
We may use the above information to determine the constants in the Hall-Petch equation: The strength of mild steel at grain size d1 = 17.43 pm is 1 = 232.9 MPa. Mild steel has a strength of 2 = 874.2 MPa when the grain size is d2 = 0.80 um (or 800 nm). This is the formula for the Hall-Petch equation: = o + Kd(-1/2). We can use the following equation to determine K: K = (σ2 - σ1)(d2^(1/2) - d1^(1/2))^(-1) (-1) When the values are plugged in, we get the following result: K = (874.2 - 232.9)(800(1/2) - 17.43(1/2))(-1) = 276.3 MPa um(1/2) We can use the following equation to determine o: σo = σ1 - Kd1^(-1/2) Plugging in the numbers yields the following result: o = 232.9 - 276.3(17.43(-1/2)) = 62.28 MPa. The Hall-Petch equation's constants are K = 276.3 MPa um(1/2) and o = 62.28 MPa. Hence, the power of the yield strength of mild steel at 0.160 pm grain size is 1851 MPa.
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If 3.7 liters of CI2 are used for this reaction, how much HCI will be formed in liters?
Assume there are enough reactants to complete and STP
H2(g)+C12(g)-->2HCI (g)
The volume of HCl that will be formed from 3.7 liters of Cl2 would be 6.72 liters.
Moles of gas at STPAt STP, 22.4 liters of gas is equivalent to 1 mole of the gas.
3.7 liters of Cl2 = 3.7/22.4 = 0.17 mole
From the equation of the reaction, the mole ratio of Cl2 to HCl is 1:2. Thus, the equivalent mole of HCl that will be formed from 0.17 mole of Cl2 would be:
0.17 x 2 = 0.34 mole
0.34 mole of Cl2 = 22.4 x 0.3 = 6.72 liters
In other words, the volume of HCl that will be formed would be 6.72 liters.
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Imagine the following reaction of acetic acid with water is at equilibrium at 25 °C.
In A option1 is correct
What is Acid ?
In chemistry, an "acid" is a substance that donates hydrogen ions (H+) to another substance, or accepts electrons from another substance. Acids are typically characterized by a sour taste, the ability to dissolve some metals, and a pH value of less than 7 in aqueous solutions. They are often used as reagents in chemical reactions, and are important in many biological processes. Common examples of acids include hydrochloric acid (HCl), sulfuric acid (H2SO4), and acetic acid (CH3COOH). Acids can be classified as either strong or weak, depending on the extent to which they dissociate in water, and can react with bases to form salts and water in a process called neutralization.
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A student runs an experiment to figure out if the size of a wire changes how well it conducts electricity. She uses 5 different widths of copper wire and attaches each to a multimeter to measure
the resistance in the wires. The data collected is shown below.
Wire 1-12 Ohms
Wire 2-17 Ohms
Wire 3-9 Ohms
Wire 4-14 Ohms
Wire 5-6 Ohms
What is the independent variable in this experiment?
A. The multimeter.
B. The resistance values.
C. The material of the wires, copper.
D. The widths of the wires.
A student runs an experiment to figure out if the size of a wire changes how well it conducts electricity. The independent variable in this experiment is the multimeter. Therefore, option A is correct.
What is resistance ?The amount by which an object impedes or resists an electric current is referred to as resistance. The flow of electrons is referred to as electric current. Consider an example of a person struggling to move from one shop to another in a crowded market.
Because a thin wire has fewer electrons to carry the current, its resistance is greater than that of a thick wire. The relationship between resistance and the area of a wire's cross-section is inversely proportional.
Thus, The independent variable in this experiment is the multimeter,option A is correct.
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Calculate the number of calories of energy absorbed by the water Q
79942.6 calorie is the number of calories of energy absorbed by the water. The energy of an isolated system holds that energy could be transformed.
What is energy?In physics, energy is indeed the quantitative quality that is imparted to a body or a physical system and is visible in the form of light and heat.
The energy of an isolated system holds that energy could be transformed in form but cannot be generated or destroyed. The joule is the International System of Units (SI) unit of measurement for energy (J).
Q = 2 kg × 4181 J / kg °C × 40°C
= 334,480 J
=79942.6 calorie
Therefore, 79942.6 calorie is the number of calories of energy absorbed by the water.
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why polonium so easy to kill someone
Answer:
Polonium is a highly radioactive substance, meaning it emits ionizing radiation, which can cause harm to living organisms. When ingested or inhaled, polonium can damage internal organs, including the kidneys, liver, and bone marrow, and cause radiation sickness. This makes it a potent poison and an easy means to kill someone. Because of its toxic nature and the fact that it is not easily detectable, polonium has been used in assassination attempts, making it a dangerous substance to handle or be around.
Explanation:
Answer:
polonium is a highly radioactive and toxic element that can cause severs health problem if ingested or inhaled
Explanation:
How many grams are in 1. 50 moles of KMnO4?
A. 165. 06
B. 660. 24
C. 237. 06
D. 484. 29
After calculation of molar mass, The amount of grams in 1.50 moles of KMnO4 is 237.06 hence its is the Option C
The question asks to calculate the mass of 1.50 moles of KMnO4. To do this, we need to know the molar mass of KMnO4, which is calculated by adding up the atomic masses of each element in the compound, taking into account their respective number of atoms. For KMnO4, the molar mass is 39.10 + 54.94 + 4(16.00) = 158.03 g/mol.
Once we have the molar mass, we can use the formula mass = number of moles x molar mass to find the mass of 1.50 moles of KMnO4. Substituting the values, we get:
mass = 1.50 moles x 158.03 g/mol = 237.06 g
Therefore, the answer is (C) 237.06 g.
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A student combined two solutions of clear liquids in a test tube, after one minute a solid substance appeared in the test tube. Based on their observations, can the students correctly conclude that a chemical reaction occurred?
Which best describes a chemical reaction that follows the law of conservation of matter
A. The reactants have the same mass as the product
B. The reactants have the same density as the product
C. The products conserves all physical properties of the reactant
D. The products conserve all chemical properties of the reactants
Answer:
A
Explanation:
The Law of Conservation of Matter says that the amount of matter (mass) stays the same, even when matter changes its form.
Chymotrypsin has been identified as an enzyme. What characteristics
A.might this enzyme possess?
Is a catalyst
B.Inhibits the binding of a substrate to an active site
C.Speeds up a chemical reaction
D. Is found in cells of some living organisms
Chymotrypsin is an enzyme and, as such, it possesses the following characteristics:
A. Is a catalyst: Enzymes are biological catalysts that speed up chemical reactions without being consumed or altered in the process.
C. Speeds up a chemical reaction: Enzymes work by lowering the activation energy required for a reaction to occur. This means that the reaction can occur more quickly and efficiently in the presence of an enzyme.
D. Is found in cells of some living organisms: Enzymes are found in the cells of living organisms, where they play a crucial role in many biological processes, such as digestion, metabolism, and DNA replication.
These characteristics are common to all enzymes, including chymotrypsin, which is a type of protease enzyme that is involved in breaking down proteins in the digestive system.
B. Inhibits the binding of a substrate to an active site: This statement is incorrect. Enzymes actually increase the rate of reaction by facilitating the binding of the substrate to the active site, where the reaction takes place. Inhibitors, on the other hand, can interfere with this binding and slow down the reaction.
Sodium chlorate decomposes into sodium chloride and oxygen gas as seen in the equation below.
2NaClO3 --> 2NaCl +3O2
How many moles of O2 were produced by 4 moles of NaClO3? Round your answer to the nearest whole number.
Answer:
16 moles
Explanation:
Since we have the ratios of the substances' molar masses, we can just calculate using those. We know that our end product has 3 grams of oxygen; our equation shows that the end product has 3O2 after decomposition, so we can compare how much oxygen we have to how much 3O2 would weigh if we had whole moles of substance.
3O2 would be six moles and weigh 96 grams. Since we only actually have 3 grams, we know that we are working with 3 / 96 = 1/32 of a mole per substance. Now, we look at the equation again, and multiply the ratio of each substance by 1/32, and then by the molar weight. All that's left is finding the importance of the Sodium and the Chlorine, both of which are prevalent in a ratio of 2, so we take 2/32=1/16 of each substance and multiply by their molar weights; 23/16 grams of Sodium, and 35.5/16 grams of Chlorine. Adding those together, we have 58.5/16 grams, which we can round to 64/16, or 4. Adding those 4 grams to the 3 grams of oxygen that the problem gives us, we have seven grams of Sodium Chlorate necessary to give us 3 grams of oxygen post-decomposition.
Answer:
Explanation:
From the given equation, for every 2 moles of NaClO3, 3 moles of O2 are produced.
So, for 4 moles of NaClO3:
4 moles NaClO3 / 2 moles NaClO3 = 2
Therefore, 2 * 3 moles O2 = 6 moles O2.
So, 4 moles of NaClO3 will produce 6 moles of O2.
The base SI unit for molar mass is kgmol.
A. TRUE
B. FALSE
The diagram above is a molecular model of a gaseous diatomic element that is just above its boiling point. Intermolecular forces between the gas molecules will cause them to condense into the liquid phase if the temperature is lowered. Which of the following best describes how the model is limited in its depiction of the phenomenon?
Based on the model shown, the model is limited in its depiction of the condensation of gases as it does not show how the temporary fluctuating dipoles of the molecular electron clouds result in a net force of attraction between the molecules.
The correct option is D.
What are the intermolecular forces in gases?Intermolecular forces are the forces that exist between the molecules of substances such as gases, liquids, and solids. The intermolecular forces in gases are negligible.
Dipole-dipole interactions, London dispersion forces (commonly referred to as van der Waals forces), and hydrogen bonds are the three main types of intermolecular interactions.
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pls i need help with the powerpoint , is only 2 slides.
The given model of metal lattice represent the metallic ions as spheres. The model is very easy to use however, the it does not represent the delocalization of electrons.
What is malleability ?Metals have some peculiar features including malleability, ductility, luster high conductivity etc. These properties are based on the metal -metal bonds between the metallic particles in the lattice.
A metal lattice is a pool of mobile electrons and ions. They can be easily dislocated that is why metal is malleable. The given model of metal lattice represents the metallic particles as spheres. It is easy to show how the particles can dislocate on a pressure applied.
However, it is not describing the delocalization of electrons and metal -metal bonding within the lattice. But it is enough to show the dislocation at the boundary and easiness to be flattened.
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Describe the relationship
between the salinity of water and its surface tension.
Given AH -86 kJ/mol and AS° = -478 J/mol K, determine AG and the spontaneity of the reaction A,(g) + 3 X₂(g) → 2 AX,(g) at 591 K.
A) +196 kJ/mol, spontaneous
B) +196 kJ/mol, nonspontaneous
C) +282 kJ/mol, nonspontaneous
D) +282 kJ/mol, spontaneous
E) -196 kJ/mol, spontaneous
Fracture zones are cracks on the ocean floor that horizontally offset mid-ocean ridges. Fracture zones typically run perpendicular to mid-ocean ridges. The diagram below shows two tectonic plates moving apart. One plate is dark blue, and the other is light blue. Several fracture zones are shown at places where parts of the same tectonic plate are moving in the same direction but at different speeds.
Fracture zones are areas of weakness in the oceanic crust, and they form as a result of the stress of plate tectonics. They are usually narrow and can be up to several hundred kilometers in length.
What is the kilometers ?Kilometers (km) are a unit of measurement for length or distance. One kilometer is equivalent to 1000 meters and is equal to 0.6214 miles. Kilometers are commonly used to measure long distances, such as the length of a road or the distance between two cities. In science, kilometers are often used to measure the size of large objects, such as the diameter of planets, or the distance between two stars.
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How many moles are in 1.5 x 1022 atoms of Cu?
There are 0.0249 moles of Cu in 1.5 x 10²² atoms of Cu.
What is Mole?
A mole is a unit of measurement used in chemistry to express amounts of a chemical substance. It is defined as the amount of a substance that contains the same number of entities (such as atoms, molecules, or ions) as there are in 12 grams of pure carbon-12, which is approximately 6.022 x 10²³ entities.
This number is called Avogadro's number and is used as a conversion factor between the mass of a substance and the number of particles it contains.
To calculate the number of moles, we need to know the atomic mass of Cu, which is 63.55 g/mol.
We can use Avogadro's number, 6.022 x 10²³, to convert the number of atoms to moles:
1.5 x 10²² atoms Cu * (1 mol Cu / 6.022 x 10²³ atoms Cu) = 0.0249 mol Cu
Therefore, there are 0.0249 moles of Cu in 1.5 x 10²² atoms of Cu.
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There are 0.0249 moles of Cu in 1.5 x 10^22 atoms of Cu.
What is Mole?
A mole is a unit of measurement used in chemistry to express amounts of a chemical substance. It is defined as the amount of a substance that contains the same number of entities (such as atoms, molecules, or ions) as there are in 12 grams of pure carbon-12, which is approximately 6.022 x 10^23 entities. This number is called Avogadro's number and is used as a conversion factor between the mass of a substance and the number of particles it contains.
To calculate the number of moles, we need to know the atomic mass of Cu, which is 63.55 g/mol.
We can use Avogadro's number, 6.022 x 10^23, to convert the number of atoms to moles:
1.5 x 10^22 atoms Cu * (1 mol Cu / 6.022 x 10^23 atoms Cu) = 0.0249 mol Cu
Therefore, there are 0.0249 moles of Cu in 1.5 x 10^22 atoms of Cu.
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Calculate the volume of CO2(g) that would form from the burning of 22g of C3H8 (g) at
STP
C3H8(g)+502(g)->3CO2(g)+4H20 (g)
The volume of CO2 that would form from the burning of 22 g of C3H8 at STP is 33.6 L.
What is volume?Volume is described as a measure of three-dimensional space. It is often quantified numerically using SI derived units or by various imperial or US customary units.
We will calculate the number of moles of propane (C3H8) that are burned:
22 g C3H8 × 1 mole C3H8 / 44 g C3H8 = 0.5 mole C3H8
Find the number of moles of carbon dioxide (CO2) produced by the reaction:
0.5 mole C3H8 × 3 mole CO2 / 1 mole C3H8 = 1.5 mole CO2
The volume of CO2 produced at STP is found as follows:
1.5 mole CO2 × 22.4 L CO2 / 1 mole CO2 = 33.6 L CO2
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Sometimes a neutral oxygen (o) atom may gain electrons. when this happens, oxygen becomes a(n) _____ with a ______charge .
Sometimes a neutral oxygen atoms gains electrons. The oxygen then becomes an anion with a negative charge.
All the atoms undergoes chemical reactions to attain the octet electronic configuration. It means that it tries to attain the configuration of noble gases, which has the most stable atoms.
Oxygen has 6 electrons in its outer shell. It accepts two more electrons to attain the configuration of neon. As it attains electrons the atoms become negatively charged ions, called anions. It will now become O²⁻.
So the oxygen atom attains electrons to become an anion, with negative charge.
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Two solutions of different concentrations of acid are mixed creating 40 ml of a solution that is 32% acid. One-quarter of the solution is made up of a 20% acid solution. The remaining three-quarters is made up of a solution of unknown concentration, c.
The unknown concentration, c, of the acid in the remaining three-quarters of the solution is 36%.
Let x be the volume of the unknown concentration of the solution.
Then, the volume of the 20% acid solution is (40/4) = 10 ml.
We know that the total volume of the resulting solution is 40 ml, and the resulting solution is 32% acid.
This means the amount of acid in the solution is:
0.32 * 40 ml = 12.8 ml
Since we mixed 20% and c% solutions, we can set up an equation:
0.2 * 10 ml + c * x = 12.8 ml
Solving for c, we get:
c = (12.8 - 2)/x = 10.8/x
Since the volume of the unknown solution, x, is three-quarters of the total volume of the solution (40 ml),
x = 30 ml
Substituting x, we can solve for c:
c = 10.8/30 = 0.36
Therefore, the concentration of the acid in the remaining three-quarters of the solution is 36%.
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please name these compounds
1) 1-Phenyl propan -1-ol
2) 3-methyl butanal
3) 2-Cyano ethene
4) 4 - bromo-2-methyl pent -3- one
5) 3,5 -dihydroxy -3-enoic acid
What is the IUPAC names of the compounds?The IUPAC nomenclature has to do with the manner that we use in chemistry to be able to name compounds. These are the rules for the naming of compounds that have been put together by the International Union of Pure and applied chemistry.
In these rules, we would have to find out the root of the compound name by counting up the number of the chains that we have and then noting the substituents that we have on the chains.
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Which term is used to describe the energy needed for a chemical reaction to begin? (1 point)
bond energy
activation energy
kinetic energy
potential energy
Activation energy is used to describe the energy needed for a chemical reaction to begin.
Define chemical reactions .
Breaking chemical bonds between reactant molecules (particles) and creating new bonds between atoms in product particles are two aspects of chemical reactions (molecules). While there are the same number of atoms both before and after the chemical transition, there will be a change in the number of molecules.
The least amount of energy necessary to start a process, such a chemical reaction, is known as the activation energy. Exothermic reactions require activation energy to begin, just like all other chemical reactions. Reactants require activation energy in order to move collectively, overcome repulsive forces, and begin bond breakdown.
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The molar mass of hydrogen gas is 2 g/mol. The molar mass of oxygen gas is 32 g/mol. When the reaction starts with 64 g of oxygen and a sufficient quantity of hydrogen, how many moles of water are produced? (1 point)
O 8
O 18
O 2
O 4
According to the stoichiometry of the reaction for formation of water according to the given condition, 4 moles of water are produced.
What is stoichiometry?It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.
In the given reaction, 32 g oxygen gives 36 g water, thus 64 g oxygen gives 64×36/32=72 g which is equivalent to 72/18=4 moles of water.
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Elag for Rev
Use the drop-down menus to complete the hypothesis of the
first group of researchers.
During a drought, the decrease in rainfall will reduce the
amount of vegetation that can grow and increase the
occurrence of natural fires, so an elevation in
Select...
and a reduction in Select...
be found in the cores.
▾should
According to the problem should and charcoal particles.
What is the charcoal ?Charcoal is a black, porous, and lightweight material that is produced by burning wood, wood products or other organic materials in the absence of oxygen. It is composed mainly of carbon, but also contains small amounts of hydrogen and other elements. Charcoal is an extremely versatile material that has been used for centuries for a variety of purposes, such as fuel for fires, as an abrasive for polishing and cleaning, and as a pigment for painting. Charcoal is also used in agriculture as a soil enhancer and fertilizer, and in medicine as a detoxifying agent.
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The relationship between the amount of energy released by an earthquake and its magnitude is described by this formula. Here E is energy, in joules, and M is magnitude. Approximately how much energy is released by a magnitude 5 earthquake? Select the correct answer.logE=5.24+1.44M
The relationship between the amount of energy released by an earthquake and its magnitude is described by this formula is [tex]E = 10^{(5.24 + 1.44M)}[/tex]
Describe magnitude.Magnitude is a unit used to describe something's size or power. It is a technique for expressing the size of an object, event, or phenomena as a number. For instance, the Richter scale is typically used to indicate the magnitude of earthquakes. Magnitude can also be used to describe a sound, force, or amount's strength or intensity. For instance, the intensity of a sound is typically measured in decibels, and the intensity of a force is typically measured in newtons. Magnitude can also be used to denote a number's size.
For a magnitude 5 earthquake, [tex]E = 10^{(5.24 + 1.44 \times 5)} = 10^{(10.24)} = 8.02 \times 10^9[/tex] joules of energy.
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In the chemical equation:
C3H8 +502 3CO₂ + 4H₂O
How many grams of oxygen are required to burn 46.8 gram of propane (C3H8)
Answer:
168.64 grams of O2
Explanation:
To burn 46.8 grams of propane (C3H8), we need to find the amount of oxygen that reacts with it according to the balanced chemical equation:
C3H8 + 5O2 -> 3CO2 + 4H2O
From the equation, 1 mole of propane (C3H8) reacts with 5 moles of oxygen to form 3 moles of carbon dioxide and 4 moles of water. The number of moles of propane can be calculated as follows:
46.8 g C3H8 / (44.1 g/mol) = 1.054 mol C3H8
Therefore, 1.054 mol of propane (C3H8) requires 5 x 1.054 = 5.27 moles of oxygen to burn completely. To find the mass of the oxygen in grams, we multiply the number of moles by the molar mass of oxygen (O2):
5.27 moles O2 * 32.0 g/mol = 168.64 g O2.
So, 168.64 grams of oxygen are required to burn 46.8 grams of propane (C3H8).
Which energy output object(s) work with the solar panel?
A. fluorescent light bulb
B. fan
C. water heater
D. incandescent light bulb
Fan and water heater are the energy output object(s) work with the solar panel. Therefore, option B and C are correct.
What is solar panel ?Solar panels are devices that capture the sun's rays and convert them into electricity or heat. A solar panel is a collection of solar (or photovoltaic) cells that can be used to generate electricity via the photovoltaic effect.
Once you've determined the voltage and amperage, all you have to do is multiply them. The wattage of your solar panel output should be similar to the solar panel rating as a result.
Thus, option B and C are correct.
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2H2(g) + O2(g) → 2 H₂O(g)
How many liters of H2 are required to produce a total of 2 moles of H2O at STP?
Taking into account the reaction stoichiometry, the volume of H₂ required is 44.8 L.
Reaction stoichiometryThe balanced reaction is:
2 H₂ + O₂ → 2 H₂O
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
H₂: 2 moles
O₂: 1 mole
H₂O: 2 moles
STP conditionsThe STP conditions refer to the standard temperature and pressure, which values are 0 °C and 1 atmosphere as a reference values for gases. In these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.
Volume of H₂ requiredTo calculate the number of moles of O₂ required, you can observe the stoichiometry of the reaction. By reaction stoichiometry 2 moles of H₂O are formed by 2 moles of H₂.
Now, you can apply the following rule of three: if by definition of STP conditions 1 mole of H₂ occupies a volume of 22.4 liters, 2 moles occupies how much volume?
volume= (2 moles× 22.4 L)÷ 1 L
volume= 44.8 L
Finally, 44.8 L of H₂ are needed.
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