The number of molecules present in 3.50 mol of nitrogen dioxide and number of atoms of oxygen are 2.108 x 10²⁴ molecules and 4.2161 x 10²⁴ molecules respectively.
Molecular formula of Nitrogen dioxide
= NO₂
Avogadro's number, defined as the number of units per mole of a substance (defined as molecular weight (g)), 6.02214076 × 10²³.
Using Avogadro's number, the number of atoms or molecules in one mole of a substance is 6.023 × 10²³. That is one mole NO₂ contains 6.023 × 10²³ molecules.
Number of NO₂ molecules in 3.50 mol
= 3.5 x 6.023 × 10²³
= 2.108 x 10²⁴ Molecules
Number of O₂ Molecules = 3.5 x 2 x 6.023 × 10²³
= 4.2161 x 10²⁴ Molecules
Oxygen will be two times more than NO₂ because each NO₂ molecule has 2 oxygen atoms.
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Help what is the answer?
The heat that is supplied is 556 J.
What is the energy required?We have to note that when we boil water that there is transformation of the heat energy to water and this is what is going to cause the temperature of the water to rise. In this case, we would med to get the heat that has been imparted to the water as we can see in the question.
We have to note that;
H = mcdT
m = mass of the water
dT = temperature change
c = heat capacity
H = 10.1 * 4.2 * (38 - 24.9)
H = 556 J as we can see.
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8. When 50.0 g of MgCO3 react completely with H3PO4, as shown below, 15.8 g of CO₂ is produced.
Determine the theoretical and percent yield for this reaction?
2 H3PO4 + 3 MgCO3 → Mg3(PO4)2 + 3 CO2 + 3 H₂O
The theoretical yield for this reaction is 78.61 g of CO2 and the percent yield is 20.0%, when 50.0 g of MgCO3 react completely with H3PO4.
What is theoretical yield?The theoretical yield is the maximum amount of product that can be produced from a chemical reaction, calculated using the stoichiometry of the reaction equation. It is based on the assumption that the reaction proceeds perfectly, without any loss or waste of reactants, and without any interference from side reactions.
The theoretical yield is calculated by determining the number of moles of each reactant, using the balanced chemical equation to calculate the number of moles of product that can be produced, and then converting this to the corresponding mass of product. It is a useful reference for determining the efficiency of a reaction and for evaluating the quality of the results obtained in a laboratory experiment.
Calculation of Theoretical yield
To calculate the theoretical yield, determine the number of moles of MgCO3 and use the balanced chemical equation to calculate the number of moles of CO2 produced.
The number of moles of MgCO3 is given by:
n(MgCO3) = m(MgCO3) / M(MgCO3)
n(MgCO3) = 50.0 g / 84.31 g/mol
n(MgCO3) = 0.595 mol
Using the balanced chemical equation, calculate the number of moles of CO2 produced:
n(CO2) = 3 * n(MgCO3)
n(CO2) = 3 * 0.595 mol
n(CO2) = 1.785 mol
The mass of CO2 produced can then be calculated:
m(CO2) = n(CO2) * M(CO2)
m(CO2) = 1.785 mol * 44.01 g/mol
m(CO2) = 78.61 g
This is the theoretical yield for the reaction.
The percent yield is a measure of the efficiency of the reaction, and is calculated as the ratio of the actual yield to the theoretical yield, multiplied by 100:
% yield = (actual yield / theoretical yield) * 100
% yield = (15.8 g / 78.61 g) * 100
% yield = 20.0%
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calculate the change in temperature of the cold water and the change in temperature of the hot water
If the initial temperature of the cold water is T1 and the final temperature is T2, then the change in temperature of the cold water is given by T2 - T1.
What is temperature?
Temperature is a measure of the average kinetic energy of the particles in a material. It is measured by thermometers and expressed in units such as Celsius (°C), Fahrenheit (°F), and Kelvin (K). Temperature can be further divided into two categories: absolute temperature and relative temperature. Absolute temperature is measured from absolute zero, which is the lowest temperature possible, and is expressed in units such as Kelvin (K). Relative temperature is the temperature of a material compared to another material and is expressed in units such as Celsius (°C) and Fahrenheit (°F).
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Effect of temperature on the rate of reaction - risk assessment. A Level required practical.
Please can someone send a copy of there's. I will edit it myself.
The relationship between temperature and reaction speed is direct.
The speed of a reaction accelerates with temperature.
How does the practical impact of temperature on reaction rate work?
The kinetic energies of A and B both increase with rising temperature, leading to more collisions per second and a higher proportion of these resulting in chemical reactions. As a result, the rate typically rises as temperature rises.
What are the rates of reaction?
The rate of reaction when concentration is changed can be gauged in two different ways. By assessing a liquid's "cloudiness," it is possible to gauge how quickly a precipitate forms. The second involves using a measuring cylinder or gas syringe over water to gauge the volume of gas produced.
What are the 4 factors that affect the rate of reaction?
temperature, pressure, and reactant type, along with concentration.
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Which of the following has a mass number of 4 and a charge of 2+?
A. alpha particles
B.beta particles
C. gamma rays
D. neutrons
Alpha Particles
Source; Trust me bro
Answer: A alpha particles
Explanation:
This:
"Metal sulfides roasted with oxygen produce the corresponding oxide and sulfur dioxide gas. "
Metal sulfides are compounds that contain sulfur and a metal. When these compounds are heated with oxygen, the sulfur and metal combine with the oxygen to form a metal oxide and sulfur dioxide gas.
The chemical equation for this process is: 2MS + O2 → MO + 2SO2, where M is the metal and S is the sulfur. In this equation, the MS represents the metal sulfide, and the MO represents the metal oxide. The oxygen combines with the sulfur and metal to produce the metal oxide and sulfur dioxide gas. The sulfur dioxide gas is a hazardous air pollutant and can cause health problems if inhaled.
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Ammonia is produced at high temperatures and under great pressure in a tank by
passing a mixture of nitrogen and hydrogen over an iron catalyst. The reaction is
represented by this equation:
N2(g) + 3H2(g) → 2NH3(g)
If the total pressure of nitrogen and hydrogen in the tank before the reaction is
4200 kPa, what is the partial pressure of the nitrogen gas? [Assume there would be
no excess reagent if the reaction went to completion.]
1050 kPa
3150 kPa
1400 kPa
2100 kPa
The partial pressure of nitrogen gas in the tank would be 1050 kPa.
Law of partial pressureAccording to the law of partial pressure of gases, the pressure of a gas mixture would be the sum of the individual pressure of the component gases.
The mole fraction of nitrogen gas in the gas mixture = 1/4
The mole fraction of hydrogen gas = 3/4
The total pressure in the tank before the reaction = 4200 kPa
Partial pressure of nitrogen = 1/4 x 4200 = 1050 kPa
In other words, the partial pressure of nitrogen gas in the mixture before the reaction would be 1050 kPa.
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Answer:
1050 kPa.
Explanation:
HELP ASAP. Due at 11:59 pm ET. I dont know if what I put in is right
Answer:
Explanation:
The net ionic equation is essentially the most simplified version of a reaction with only the reactants that form the precipitate (the solid). Due to this it is extremely important to properly write your ionic equation first. In your total ionic equation, you forgot to balance the compounds with 2- charges. The coefficients in your equation is due to the 2- charge of sulfate and 2+ charge of Strontium. Additionally, precipitates are solid which means they do not dissociate. SrSO4 will stay together while KBR which are both spectator ions will dissociate leaving you with the ionic equation below.
Total Ionic Equation: Sr^2 (aq)+ + 2Br ^1- (aq) +2K ^ 1(aq) + SO4 ^2- (aq) --> SrSO4 (s) + 2K^1+ (aq) + 2Br^1- (aq)
The coefficient of 2 on both K and Br in the products is to ensure that the equation is balanced and that for your net ionic equation, all spectator ions cancel. When you cancel all of the ions that dissociate you are left with the essence of the reaction:
Net Ionic Equation: Sr^2 (aq) + SO4 ^2- (aq) --> SrSO4 (s)
How do you determine the freezing point of a solution from its cooling curve?
Drawing two straight lines connecting the data points above and below the freezing point allows one to infer the solution's freezing point from the graph.
The freezing point of the solution is the temperature that corresponds to the point where the two lines converge.
Pure liquid cooling curves are different from solution cooling curves. Since a pure liquid freezes at a constant temperature, a flat, horizontal zone is anticipated on the cooling curve. If the cooling is kept up until all of the liquid has solidified, the temperature will eventually drop to the bath's temperature as the solid cools. On the other hand, for a solution, the temperature drops at a slower pace when freezing takes place. This happens because the solvent is freezing out completely, increasing the concentration of the liquid solution.
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a solution has a volume of 121 ml and concentration of 0.11 m nacl. what is the number of moles of nacl in this solution? 0.121 l x 0.11 mol/l 0.11 (mol/l) / 0.121 l 0.121 l / (0.11 (mol/l))
The number of moles of NaCl in a 121 mL solution with a concentration of 0.11 M is 0.01321 moles.
The number of moles of NaCl in a solution can be calculated using the concentration and volume of the solution. The volume of the solution is 121 mL, which is equal to 0.121 liters. The concentration of NaCl in the solution is 0.11 M (moles per liter). To calculate the number of moles of NaCl in the solution, we multiply the concentration by the volume:
0.11 M × 0.121 L = 0.01321 moles of NaCl
So, there are 0.01321 moles of NaCl in the 121 mL solution with a concentration of 0.11 M. This can be written as 0.121 L × 0.11 mol/L = 0.01321 moles of NaCl. The calculation can also be written as 0.11 (mol/L) / 0.121 L = 0.01321 moles of NaCl, or as 0.121 L / (0.11 (mol/L)) = 0.01321 moles of NaCl.
The number of moles of NaCl in a 121 mL solution with a concentration of 0.11 M is 0.01321 moles.
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Choose the list of items that starts with the least dense and ends with the most dense:
A: water, alcohol, ping pong ball
B: milk, maple syrup, honey
C: bolt, cherry tomato, soda cap
D: corn syrup, dish soap, lamp oil
Answer: The answer is B
Explanation: i took the test
What is the identity of the element with an electron configuration of 1s²2s²2p6 3s²3p²? How many
electrons are located in its highest main energy level and what orbitals are they located in?
Answer:
Aluminum the highest is spdf
Calculate the molarity of a solution made using 75 gram NH3 and 3000 mL of solution
The number of moles of 75 g of ammonia is 4.411 . The volume of the solution is 3 L. Then the molarity of the solution is 1.47 M.
What is molarity ?Molarity of a solution is a common term used to express the concentration of a solution. It is the the ratio of number of moles of the solute to the volume of solution in liters.
Given that the solution contains 75 g of ammonia.
molar mass of ammonia = 17 g/mol.
no.of moles in 75 g = 75/17 = 4.411 moles.
volume of solution = 3000 ml = 3 L.
molarity = no.of moles of solute/volume of solution in L.
= 4.411 mole/ 3 l = 1.47 M.
Therefore, the molarity of the solution is 1.47 M.
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Write a complete balanced equation for the following single -replacement reactions, predicting the correct products. Be sure to check the activity series to make sure the reaction occurs. Use the equation editor.1. Calcium metal is placed into a solution of copper (II) bromide. 2. Lead metal is placed into a solution of iron (III) acetate.
The complete balanced equations for the following single-replacement reactions are given as follows:
Ca (s) + CuBr₂ (aq) ---> CaBr₂ (aq) + Cu (s)Pb (s) + Fe(CH₃COO)₃ (aq) ---> No reaction occursWhat are single replacement reactions?A chemical reaction in which one element in a compound is replaced by another is referred to as a single-displacement reaction. This reaction is also referred to as a single replacement reaction or exchange reaction.
1. Based on the order of reactivity, calcium > copper
Hence, calcium dispaces copper from its solution.
2. Based on the order of reactivity, iron > lead, hence. lead cannot displace iron from its solution.
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what mass (in g) of potassium chlorate is required to supply the proper amount of oxygen needed to burn 134.9 g of methane? assume 100% yield for both reactions. enter to 0 decimal places. are the equations balanced?
Mass of potassium chlorate needed: 187 g. To find the mass of potassium chlorate needed.
we can use the balanced chemical equation for the reaction between potassium chlorate and heat to form potassium chloride and oxygen. The balanced equation is: 2KClO3 -> 2KCl + 3O2. Since 134.9 g of methane reacts with 8 g of oxygen to form carbon dioxide and water,
we can use this information to determine the amount of oxygen required for complete combustion. 134.9 g of methane requires 8 * 134.9 g = 1079.2 g of oxygen.
To produce this amount of oxygen from potassium chlorate, we would need 1079.2 g / 3 = 359.7 g of potassium chlorate.
Since the reaction only has a 100% yield, we would need 359.7 g of potassium chlorate. The equation is balanced.
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Sodium is extracted from sodium chloride by electrolysis.
(ii) State what must be done to sodium chloride before it can be electrolysed to produce sodium.
iii) Write an ionic half-equation for the change that occurs at the cathode during this electrolysis
(ii) Sodium chloride must be dissolved in a suitable solvent,
(iii) The ionic half equation for the electrolysis is
2Na+ + 2e- -> Na What is electrolysis?Electrolysis is a process in which electrical energy is used to drive a non-spontaneous chemical reaction.
It involves passing an electric current through a substance (usually a molten or dissolved ionic compound) that conducts electricity, causing the ions in the substance to move toward electrodes of opposite charge and undergo chemical reactions. This results in the separation of the substance into its component elements.
(ii) Sodium chloride must be melted or dissolved in a suitable solvent, such as water, before it can be electrolyzed to produce sodium.
(iii) The ionic half-equation for the change that occurs at the cathode during the electrolysis of sodium chloride is:
2Na+ + 2e- -> Na (sodium metal at cathode)
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suppose one needed 10.65 grams of dilute aqueous solution. what is the approximate volume of the solution in ml would be equivalent to the grams?
The volume of a dilute aqueous solution can vary depending on the concentration of the solution.
However, we can make an estimate based on the assumption that the solution has a density of approximately 1 g/mL. This means that 1 mL of the solution would weigh approximately 1 gram.
Therefore, 10.65 grams of the solution would have a volume of approximately 10.65 mL. To be more precise, you would need to know the exact density of the solution, as different solutions can have different densities, even if they are dilute aqueous solutions.
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potassium and suflur react to form an ionic compound. what is a physical property of the compound formed
Something which makes chalcogen sulfur electronegative. As a result, it is capable of gaining two electrons and becoming an S2 ion. In other words, the reaction of potassium with sulfur results in the formation of potassium sulfide as K is oxidized to K+ ion and S is reduced to S2 ion.
Two potassium atoms are utilized while creating an ionic compound with one sulfur atom. Due to the loss of one electron, each potassium atom gives its outermost electron to the sulfur atom, resulting in the formation of ions with a 1+ charge. Sulfur becomes ionized and transforms into an ion with a 2-charge when it receives these two electrons. Fluorine and potassium combine to form the ionic substance potassium fluoride (KF). Potassium metal is a good conductor of heat and electricity, is soft and white with a silvery luster, and has a low melting point. A flame colored with potassium has a lavender hue, and its vapour is green.
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explain how the bonding model for sodium metal would differ from the bonding model for sodium chlordie, NaCl
The bonding in NaCl occurs by a sodium ion and a chloride ion while the bonding in sodium metal occurs by sodium ions and a sea of electrons.
The bonding of NaCl involves sodium and ion and chloride ion which are held together by an ionic bond. The sodium atom transfers an electron to chlorine atom in order to yield the chloride ion. This ion pair exists in the compound is known as sodium chloride.
In sodium metal, the sodium cations interact electrostatically with a sea of electrons forming a metallic bond. Hence, we can conclude that while the bonding in sodium chloride involves an ion pair, the bonding in sodium metal involves sodium ions and a sea of electrons.
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when 1-bromopropane is exposed to magnesium, followed by acetone and then aqueous acid, what is the resulting product?
The product of the reaction when 1-bromobutane is exposed to magnesium, followed by acetone and then aqueous acid is 2-Methyl-2-hexanol.
What is a chemical reaction?
In a chemical reaction, one or more substances—also known as reactants—are changed into one or more additional substances—also known as products.
1-Bromopropane (n-propylbromide or nPB) is an organobromine compound with the chemical formula CH₃CH₂CH₂Br.
CH₃CH₂CH₂Br + Mg → CH₃CH₂CH₂MgBr
When 1-bromobutane reacts with magnesium in ether, a Grignard reagent is created.
With carbonyl compounds, the Grignard reagent reacts to produce the corresponding alcohols.
When formaldehyde is the carbonyl compound, primary alcohols are produced.
When an aldehyde other than formaldehyde is the carbonyl compound, secondary alcohols are produced.
Grignard reagents and ketones react to produce tertiary alcohols.
Given that the carbonyl compound in question is Acetone (ketone), the result will be a tertiary alcohol.
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which antiseptic may affect the results of tests for bilirubin uric acid
The antiseptic may affect the results of tests for bilirubin uric acid is Povidone-iodine.
Polyvinylpyrrolidone (povidone, PVP) and elemental iodine combine chemically to form the stable compound known as povidone-iodine. On a dry basis, it has a 9.0% to 12.0% available iodine content. H. A. Shelanski and M. V. Shelanski found this particular complex in 1955 at the Industrial Toxicology Laboratories in Philadelphia.
The compound was discovered to be less harmful to mice than tincture of iodine during in vitro tests to exhibit anti-bacterial efficacy. Clinical tests on humans revealed that the medication outperformed competing iodine formulations. Povidone-iodine was marketed right away and has since taken over as the most widely used iodine antiseptic.
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Povidone-iodine is an antiseptic that may affect the results of tests for bilirubin and uric acid. Povidone-iodine is a commonly used antiseptic that can be applied topically to the skin to reduce the risk of infection during medical procedures. However, it can also interfere with certain laboratory tests, including tests for bilirubin and uric acid.
Bilirubin is a yellow pigment that is produced when red blood cells break down, and it is excreted by the liver. Uric acid is a waste product that is produced when the body breaks down purines. Both bilirubin and uric acid can be measured through laboratory tests to help diagnose certain medical conditions.
However, povidone-iodine can interfere with these tests by reacting with the substances being tested, leading to inaccurate results. It is important for healthcare professionals to be aware of the potential for povidone-iodine to affect laboratory test results and take appropriate measures to minimize this risk, such as avoiding its use immediately prior to testing.
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I NEED HELP ASAP!!!!!!!!!!
The standard enthalpy of formation of gaseous carbon dioxide is −393.5 kj/mol. what is the equation that represents the formation of gaseous carbon dioxide?
C(s) + O2(g) → CO2(g) is the equation for the production of carbon dioxide gas.
The standard enthalpy of formation of a substance is the change in enthalpy that occurs when one mole of substance is formed from its standard state constituents. A pure element in its standard state has a standard enthalpy of formation of zero. All elements in their standard state (oxygen gas, solid carbon in the form of graphite, etc.) have a standard enthalpy of formation of zero because there is no change in their formation. C(s) + O2(g) → CO2(g) is the equation for the production of carbon dioxide gas.
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Where do most of the proteins in cookie dough come from?a. Sugarb. eggsc. Butterd. Flour
Most of the proteins in cookie dough come from eggs (Option b.).
Proteins are big biomolecules and macromolecules that are composed of one or more long chains of amino acid residues. Proteins can be classified as either macromolecules or biomolecules. Proteins are responsible for a wide variety of processes that take place within organisms.
These processes include the catalysis of metabolic reactions, the replication of DNA, the response to stimuli, the provision of structure to cells and organisms, and the movement of molecules from one location to another. Proteins are distinguished from one another primarily by the order of the amino acids that they contain. This order is determined by the nucleotide sequence of their genes, and it typically leads to the protein folding into a particular three-dimensional structure that is responsible for determining the protein's function.
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a sample of 5.10 g of naphthalene (c10h8) is dissolved in 76.1 g of benzene (c6h6). calculate the percent by mass of naphthalene in this solution.
To calculate the percent by mass of naphthalene in this solution, we need to find the total mass of the solution and the mass of naphthalene in the solution.
The mass of the solution is the sum of the masses of naphthalene and benzene:
mass of solution = mass of naphthalene + mass of benzene
mass of solution = 5.10 g + 76.1 g = 81.2 g
Next, we can find the mass of naphthalene in the solution as a fraction of the total mass and convert it to a percentage:
mass of naphthalene / mass of solution * 100%
(5.10 g) / (81.2 g) * 100% = 6.29%
Therefore, the percent by mass of naphthalene in this solution is 6.29%.
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. Each reproductive _____________ has only one copy of each gene.
Each reproductive cell has only one copy of each gene because it has a haploid number of genes.
What is a haploid number of genes?The expression a haploid number of genes is used to denote that meiotic reproductive gamete cells only contain a set of chromosomes in opposition to mitotic somatic cells that are diploid because they contain two complete sets of chromosomes.
Therefore, with this data, we can see that the haploid number of genes only has a complete set of different chromosomes in the meiotic gametic types of cells.
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pls find the answers plss
Answer:
a)Boron and Flourine 3. b) Carbon and Hydrogen 4. c) Sulfur and Oxygen 3. d) Nitrogen and Flourine 3. e) Nitrogen 2 and Oxygen 4. f) Chlorine 2 and Oxygen 5. g) Phosphorus and Chlorine 3. h) Hydrogen 2 and Oxygen 2. i) Boron and Chlorine 3 . j) Oxygen and Chlorine 2
what happens to the motion of molecules after equilibrium is reached
Answer: It will continue to move
Explanation: Although it may seem as if the concentrations are not changing, nearly equal numbers of particles cross the membrane in both directions.
when flavoprotein transfers electrons directly to oxygen, hydrogen peroxide is produced. what other consequences might results from electron carriers in the etc being bypassed?
When flavoprotein transfers electrons directly to oxygen, hydrogen peroxide is produced. The other consequences might results from electron carriers in the etc being bypassed is hydrogen peroxide.
In a typical mechanism, flavoproteins that are engaged in electron transfer absorb the electrons from primary dehydrogenases and transfer them to flavoprotein dehydrogenase, which then transfers the electrons to coenzyme Q. Flavoproteins are found in the inner mitochondrial membrane.
Therefore, if the flavoprotein transports the electrons to the final electron acceptor directly, hydrogen peroxide, a very strong oxygen radical, would be created. In addition to this, the other outcome would be;
As a result of pumping fewer protons into the mitochondria's intermembrane gap, less ATP would be produced.
There would be more heat production because the energy of the electrons would be lost as heat since it is not used to produce ATP.
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combustion analysis of 1.200 g of an unknown compound containing carbon, hydrogen and oxygen produced 2.086 g of carbon dioxide and 1.134 g of water. what is the empirical formula of the compound? please input the subscript hydrogen has in the empirical formula.
The empirical formula of the compound is C2H2O2, with hydrogen having a subscript of 2.
The equation for combustion of the unknown compound is:
CxHyOz + O2 → CO2 + H2O
Therefore, the equation for this particular combustion reaction is:
1.200g CxHyOz + 32.00g O2 → 2.086g CO2 + 1.134g H2O
Rearranging the equation, we get:
1.200g CxHyOz → 2.086g CO2 + 1.134g H2O - 32.00g O2
Dividing both sides of the equation by the molar mass of the compound:
[tex]\frac{(1.200g CxHyOz)}{(x(12.01) + y(1.008) + z(16.00))}\\ \\=\frac{ (2.086g CO2 + 1.134g H2O - 32.00g O2)}{(44.01)}[/tex]
After simplifying, we get:
[tex]\frac{(1.200g CxHyOz)}{(x(12.01) + y(1.008) + z(16.00)) }\\\\= 0.0478[/tex]
Therefore, the empirical formula of the compound is C2H2O2, with hydrogen having a subscript of 2.
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