A system containing 1 atm of an ideal gas is doubled in temperature and halved in volume, and then the new pressure is 4 atm. Thus, d is the correct option.
The gas law equation to find out the new pressure is as follows:
P₂ V₂ / T₂ = P₁ V₁ / T₁
Where,
The initial pressure, P₁ = 1 atm
The initial volume, V₁ = V₁
the initial temperature = T₁
The final pressure P₂ =?
The final volume is given as, V₂ = V₁/ 2
The final temperature, T₂ = 2T₁
P₁ V₁ / T₁ = (P₂ V₁/ 2 ) / 2T₁
P₂ = 4 atm
Thus, the new pressure is 4 atm.
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2. Some gold used for jewelry is called '18-karat white gold. This alloy is 75% gold (Au), 12.5%
silver (Ag), and 12.5% copper (Cu). If you wanted to make 25 grams of 18-karat white gold for a
ring, how many grams of each metal would you need to start with?
If you wanted to make 25 grams of 18-karat white gold for a ring then grams of each metal will remain same.
What is gold?Gold has the chemical symbol Au (from Latin: aurum) as well as the atomic number 79. As a result, it is one among the highest atomic number elements found in nature.
Some gold used for jewelry is called '18-karat white gold. This alloy is 75% gold (Au), 12.5% silver (Ag), and 12.5% copper (Cu). If you wanted to make 25 grams of 18-karat white gold for a ring then grams of each metal will remain same.
Therefore, if you wanted to make 25 grams of 18-karat white gold for a ring then grams of each metal will remain same.
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what is the relationship between absorbance and concentration?
The concentration of a chemical influences absorbance. A substance's absorbance relates to its concentration. This is true because the quantity of light absorbed depends on the number of molecules with which light interacts.
The relationship between the absorbance and the concentration (c) of the sample solution employed in the experiment is straightforward. The width of the cuvette (l), which is equal to the length of the light path (l), has a direct relationship with absorbance. They are negatively correlated; as concentration rises, absorbance falls. Using Lambert's Beer Law, it is demonstrated that given a clear but colored solution, the relationship between absorbance and concentration is directly proportional. Increased particle density increases light absorption.
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Is the disaccharide made from a glucose linked to a fructose?
Sucrose is the carbohydrates that disaccharide made from a glucose which is linked to a glucose named fructose.
Carbohydrates are one of the macro minerals, along with protein and fat, that give the energy necessary for the body to perform all it's diurnal functions. There are two general types of carbohydrates called simple carbohydrates and complex carbohydrates.
Simple carbohydrates are broken down by the body veritably snappily into glucose for energy, and complex carbohydrates have longer chains of glucose motes and thus take longer to digest.
Polysaccharide comes from word “ poly ” which means numerous. Polysaccharides formed of long chains or numerous motes of monosaccharides. It includes bounce, cellulose, glycogen.Two motes of a simple sugar that are linked each other form a disaccharide. One of the most common disaccharides is sucrose( known as table sugar), which is composed of one glucose and one fructose patch. Maltose is composed of two glucose motes, while lactose( milk sugar) is synthesized by glucose and galactose.Monosaccharides or simplest sugar is a structure blocks of carbohydrates. They're glucose, galactose and fructose.Learn more about Types of carbohydrates:
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Exercise 6.76- Enhanced - with Feedback
MISSED THIS? Read Section 6.6. You can click on the
Review link to access the section in your eText.
Silver chloride, often used in silver plating, contains 75.27%
Ag.
Part A
Calculate the mass of silver chloride in grams required to make 4.4 g of silver plating
Express your answer using two significant figures.
196) ΑΣΦ
magci =
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g
Silver chloride, often used in silver plating, contains 75.27% Ag. 450mg is the mass of silver chloride in grams required to make 4.4 g of silver plating.
What is silver plating?Silver is stable in clean air and clean water, but tarnishes whenever subjected to ozone, hydrogen sulfide, especially sulfurous air. Silver is largely utilized in electroplating for industrial purposes, notably electrical connections.
1 mole of AgCl, 0.7527 mol of Ag present.
1 mol of Ag is obtained from 1/0.75mol of AgCl
number of moles = 4.4 g / 107.87=0.002mol
0.002364 mol of Ag will be obtained from 0.002mol/ 0.7527 =0.003 mol
mass = moles × molar mass
= 0.03 × 143.3=0.450g=450mg
Therefore, 450mg is the mass of silver chloride in grams required to make 4.4 g of silver plating.
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Which food chain best represents the flow of energy from plants to mountain lions in this food web?
1. Plants, grasshoppers, frogs, mountain lions
2. Plants, deers, coyotes, mountain lions
3. Plants, deer, birds, mountain lions
4. Plants, grasshoppers, birds, mountain lions
can you guys help me with these things??? please!
The balanced reaction equation is; NH4Cl (aq) → NH3 (aq) + HCl (aq)
The temperature was increasing by 1 degree.
How do you balance reaction equation?
Balancing a chemical reaction equation involves making sure that the same number of each type of atom appears on both the reactant and product side of the equation. This is necessary because the law of conservation of mass states that the total amount of matter in a system must remain constant.
To balance a chemical reaction equation, follow these steps:
Write the unbalanced equation
Count the number of atoms of each element on both sides of the equation.
Add coefficients (numbers in front of molecules) to the reactants or products to make the number of atoms of each element the same on both sides of the equation.
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Which of these ions is most likely to be leached from the soil?magnesium ions,chlorine ions,calcium ions,iron ions, orpotassium ions
Potassium ions are highly soluble in water and are easily leached from the soil. They are important for plant growth and are one of the three main macronutrients required by plants
Factors Affecting Ion Leaching in Soil and the Most Leachable IonSoil leaching is the process by which water-soluble minerals and nutrients are removed from the soil due to the downward movement of water. The leaching of ions from soil depends on several factors such as soil texture, organic matter content, rainfall, and soil pH. The most leachable ion from the soil is potassium (K+).
Potassium ions are highly soluble in water and are easily leached from the soil. They are important for plant growth and are one of the three main macronutrients required by plants. However, excessive leaching of potassium from the soil can lead to soil degradation and nutrient depletion. This is especially true in sandy soils with low organic matter content, where water moves quickly through the soil profile and takes the potassium ions with it.
Other ions such as magnesium, chlorine, calcium, and iron are less likely to be leached from the soil due to their lower solubility in water. However, the leaching of these ions can still occur under certain conditions. For example, calcium ions can be leached from acidic soils, while iron ions can be leached from waterlogged soils.
In conclusion, the leaching of ions from the soil is a natural process that can have both positive and negative effects on plant growth and soil health. The most leachable ion from the soil is potassium, but the leaching of other ions can also occur depending on soil conditions. It is important for farmers and gardeners to manage soil fertility and nutrient levels to prevent excessive leaching of potassium and other ions from the soil.
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you decide to blow bubbles (soapy water) outside on a snowy day. which answer best explains what has happened to the molecule arrangement of the water?
The water molecule positioning has become farther apart, forming rings. Thus, B is the correct option.
The molecules at the surface of water do not have water molecules above them to cling to, so they grow a stronger bond with the water molecules which are adjacent to them. Thus, the surface of the water develops a thin, flexible ‘skin’. Scientists call this surface tension.
Surface tension acts a bit like an elastic layer. Some insects can walk on water because their weight is little enough so it does not break through the surface tension. If we look carefully at the insect’s feet, we can see that the water looks as if it is stretched.
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The correct question is:
you decide to blow bubbles (soapy water) outside on a snowy day. which answer best explains what has happened to the molecule arrangement of the water?
A) The WATER molecule ARRANGEMENT has become CLOSER.
B) The WATER molecule ARRANGEMENT has become FARTHER APART, forming rings.
C) The WATER molecule ARRANGEMENT has become CLOSER, forming squares.
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Which type of plate boundary is the student modeling? Explain your answer.
The "convergent plate boundary" is the kind of plate boundary that the student is simulating.
What does word boundary mean?This zero-width check between two letters identifies a word boundary. A word character and a non-word letter must be present for the test to be successful. Each figure must appear on one side, regardless of which side they are on.
What are examples of word boundaries?For illustrate, the "three little pigs" went to the market. Indivisibility: Specify a statement and request that someone "add extra words" to it. This additional item will be entered between the words, not before or after them.
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A dog chases a rabbit out of the garden at a speed of 6.0 m/s. If the dog has a momentum of 60.0 kg • m/s then what is his mass
Hi there, here's your answer:
Given the velocity of the dog v = 6.0 m/s
Momentum of the dog P = 60.0 kg m/s
To find:
The mass of the dog.
Solution:
We know that the formula for finding the momentum given the mass of a body and it's velocity is P = m × v.
Substituting the values, we get 60.0 = m × 6.0
Therefore, [tex]m = \frac{60.0}{6.0} = 10kg[/tex]
Thus, the mass of the dog is 10kg.
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An aqueous NaCl solution is made using 112 grams of NaCl diluted to a total solution volume of 1 L. Calculate the molarity, Molality, and mass percent of solution
Molarity of solution is 1.91moles/L ,molaity of solution is 1.91mole/Kg and mass percent of solution is 99.8%
Molality is a proportion of the quantity of moles of solute in an answer comparing to 1 kg or 1000 g of dissolvable. This differentiations with the meaning of molarity which depends on a predetermined volume of arrangement.An ordinarily involved unit for molality in science is mol/kg. An answer of fixation 1 mol/kg is likewise once in a while signified as 1 molal. The unit mol/kg expects that molar mass be communicated in kg/mol, rather than the standard g/mol or kg/kmol.
We know that molarity=number of moles of solute/volume of solution in liters.
Now,number of moles of NaCl=112/molecular mass of NaCl.
Molecular mass of NaCl is 58.5g
So,number of moles of NaCl=112/58.5g=1.91moles
Now,molarity=number of moles of NaCl/volume of solution in liters
=>molarity=1.91/1=1.91moles/liters.
Now,molality=number of moles of NaCl/ amount of solvent in grams
Here,solvent is water so,amount of solvent in 1000gm
So,molality =1.91/1000g=1.91/1kg=1.91moles/Kg
Now,mass percent of solution =(mass of solute/total mass of solution) ×100
Mass of solute is 112g and total mass of solution is 112+1000+10g=1122g
Therefore,mass percent of solution =(112/1122)×100=99.98%
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When heating this reaction mixture at reflux, the reaction temperature will be maintained at approximately. A. 25C B. 65C C.100C D. 125C
The reaction temperature at reflux will typically be lower than 100°C.
The boiling point of the reaction mixture is determined by the vapor pressure of the components present in the reaction mixture. As such, the temperature of the reaction mixture at reflux will depend on the boiling point of the components present in the reaction mixture. Generally, the boiling point of a reaction mixture is lower than the boiling point of its components, so the reaction temperature at reflux will be lower than the boiling point of the components. Therefore, the reaction temperature at reflux will typically be lower than 100°C.
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explain why a water or carbon dioxide fire extingisher might not be effective in putting out a sodium fire
Water and carbon dioxide are ineffective extinguishing agents for a sodium fire because they react with sodium to produce hydrogen gas and carbon monoxide, which can ignite and worsen the fire.
When sodium metal is exposed to air or water, it reacts vigorously and can ignite, producing a bright yellow flame. Sodium is highly reactive and has a low ignition temperature, so even a small amount of heat or moisture can cause it to ignite.
Water is not appropriate because it reacts with sodium to produce hydrogen gas, which can ignite and make the fire worse. This reaction also releases a large amount of heat, which can further fuel the fire.
Carbon dioxide can also be ineffective for extinguishing a sodium fire. While carbon dioxide does displace oxygen, it can also react with the sodium metal to produce carbon monoxide and sodium oxide. These products can also ignite and potentially increase the intensity of the fire.
Therefore, in the case of a sodium fire, specialized extinguishing agents such as dry powder, sand or graphite are recommended. These agents can help to smother the fire and prevent the sodium from coming into contact with air or moisture, which can further fuel the fire. It is important to note that sodium fires should be handled with extreme caution and should only be extinguished by trained professionals using the appropriate equipment and techniques
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How is an unknown oxidation state of an element within a compound
determined?
By taking a sum of the oxidation numbers and equating it to zero, the oxidation number of the unknown element can be determined.
What is the oxidation number?We know that the oxidation state of an unknown element can be found in a compound can be determined when we know that the sum of all the oxidation numbers of the elements in the compound is zero.
If we know the oxidation number of the other elements in the compound then we can call the unknown oxidation number x. By taking a sum of the oxidation numbers and equating it to zero, the oxidation number of the unknown element can be determined.
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IS ANYONE GOOD AT CHEMISTRY IF SO PLEASE COMMMENT AND LMK I NEED HELPPP
Answer:
yes I am good at the subject. That is my course
a swimming pool whose volume is gal contains water that is ​% chlorine. starting at t​0, city water containing ​% chlorine is pumped into the pool at a rate of ​gal/min. the pool water flows out at the same rate. what is the percentage of chlorine in the pool after ​? when will the pool water be ​% ​chlorine?
the percentage of chlorine in the pool will be % When the amount of chlorine in the pool is equal to the amount that was in the city water.
The pool has a total volume of gal, and it is initially filled with water containing % chlorine. Starting at t0, city water containing % chlorine is pumped into the pool at a rate of gal/min. At the same time, the pool water flows out of the pool at the same rate.
After minutes, the pool will contain % chlorine. This can be determined by calculating the amount of chlorine that will be in the pool after minutes, which is calculated by adding the amount of chlorine that was initially in the pool and the amount of chlorine that will be added to the pool from the city water. When the amount of chlorine in the pool is equal to the amount that was in the city water, the percentage of chlorine in the pool will be %.
When the pool water reaches % chlorine, this will happen after minutes. This can be determined by calculating the amount of chlorine that will be in the pool after minutes, which is calculated by subtracting the amount of chlorine that was initially in the pool, and adding the amount of chlorine that will be added to the pool from the city water. When the amount of chlorine in the pool is equal to the amount that was in the city water, the percentage of chlorine in the pool will be %.
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Transcribed image text: A pipet is used to measure out 10 mL of water. If the mass of this volume of water is 9.990 g and the density of water is given as 0.9978 g/mL, what is the actual volume of water measured out? O 10.000 mL 9.990 mL O The actual volume measured out is impossible to tell 10.012 mL
10.012 mL is the actual volume of water measured out.
We can use the given information to determine the actual volume of water measured out using the formula:
The density of water is equal to the Mass of water divided by the Volume of water.
Rearranging this formula, we get:
Volume = Mass / Density
As per the given information,
Mass of water = 9.990 mL
Density of water = 0.9978 g/mL
Volume = 9.990 g / 0.9978 g/mL
Volume = 10.012 mL (rounded to three significant figures)
One milliliter of water has a volume of 1 cubic centimeter.
Therefore, the actual volume of water measured out is 10.012 mL. The closest option given in the transcribed image is 10.012 mL.
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nuclei differ in their stability, and some are so unstable that they undergo radioactive decay. the ratio of the number of neutrons to the number of protons in a nucleus (n/z) correlates with its stability. calculate the n/z ratio for 147sm.
Nuclei differ in their stability, and some are so unstable that they undergo radioactive decay. the ratio of the number of neutrons to the number of protons in a nucleus (n/z) correlates with its stability. 1.41 is the n/z ratio for 147Sm.
What is radioactive decay?The process by which an unstable atomic nucleus loses energy through radiation is known as radioactive decay (also referred as nuclear decay, radioactivity, radioactive disintegration, and nuclear disintegration). A radioactive substance is one that contains unstable nuclei.
Nuclei differ in their stability, and some are so unstable that they undergo radioactive decay. the ratio of the number of neutrons to the number of protons in a nucleus (n/z) correlates with its stability.
n/z ratio = 88/62= 1.41
Therefore, 1.41 is the n/z ratio for 147Sm.
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how many grams of pbbr2 will precipitate when excess febr3 solution is added to 79.0 ml of 0.578 m pb(no3)2 solution?
Lead nitrate reacts with ferric bromide to give lead bromide and ferric nitrate. Here the weight of lead bromide precipitate will be 16.75g.
We can write the balanced reaction as follows,
3Pb(NO₃)₂ + 2FeBr₃ -----------> 3PbBr₂ + 2Fe(NO₃)₃
Here ferric bromide is in excess, so the limiting reagent will be lead nitrate.
Number of moles = molarity × volume in L
Number of moles of lead nitrate reacted = 0.578 × 0.079
= 0.0456
3 moles of lead nitrate reacts to form 3 moles of lead bromide.
So 0.0456 moles of lead nitrate gives 0.0456 moles of lead bromide.
Number of moles of lead bromide = 0.0456
Molar mass of lead bromide = 367.01
Mass of lead bromide formed = Number of moles× molar mass
= 0.0456 × 367.01 = 16.75g
So the mass of lead bromide precipitate will be 16.75g
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a solution is made using 191.7 ml of isopropanol (density 0.7860 g/ml) and 275.0 ml of water (density 1.000 g/ml). what is the molality isopropanol in water?
Isopropanol has a molality in water of 9.1315 M. suppose a solution is created using 275.0 ml of water and 191.7 ml of isopropanol, both of which have a density of 1.000 g/ml.
Molarity = grams of solute/molar mass of solute x 1/mass of solvent(Kg)
mass os isopropanol = density x volume
= 0.7860 g/ml x 191.7 ml
= 150.6762 gm
mass of water(solvent) = 275.0 ml x 1.000 g/ml
=275.0 gm
= 0.275 Kg
Molarity = 150.67gm / 60g/mol x 1/0.275Kg
Molarity = 9.1315 M
The number of moles of solute per litre of solution is known as molecularity or molar concentration.
The mass or moles of solute and the volume of the solution can be converted using molar concentration.
Homogeneous mixes are created when ingredients are combined in a way that ensures the composition is consistent throughout the sample. The term "heterogeneous" refers to a mixture that does not have a constant composition across the sample.
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suppose you separate a 2.40 mixture of sand and salt and recover 1.49 g of salt. what is the perecent by mass of salt in the mixture?
The correct answer is
The percent by mass of salt in the mixture is 62.08%
A component in a particular combination or a concentration can be described using the mass percent symbol. The mass of solute present in a certain mass of solution is indicated by the mass percentage used to characterize the solution composition. The concentration of the solute is expressed in units of mass or moles. The mass percent is the ratio of the mass of the solute in a solution to the mass of the entire solution. Since this type of concentration, which is often calculated for solid- and liquid-phase solutions, is reported as a percentage, it must also be multiplied by 100 as shown below.
Minimum (G) 100 equals Mass Percent.
Since a solution consists of both a solute and a solvent, its total mass is equal to the sum of the masses of the two components. As a result, the following equation may also be used to calculate the mass percent of a solution.
Mass Percent = msolute(g), msolvent(g), and msolute(g), multiplied by 100
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a 50.00 ml sample is titrated with 18.10 ml of a 0.0148 m hcl solution to the phenolphthalein endpoint. what is the p alkalinity of the sample in ppm of caco3?
The p-alkalinity of the CaCO3 sample in ppm is 12.57.
In order to solve this problem, we need to use the balanced chemical equation for the reaction between the HCl and the alkalinity in the sample:
OH- + HCl -> H2O + Cl-
From the equation, we can see that each mole of HCl reacts with one mole of OH-. Therefore, the number of moles of OH- in the sample is equal to the number of moles of HCl that were added during the titration.
We can use this information to calculate the p-alkalinity of the sample as follows:
Calculate the number of moles of HCl that were added during the titration:
moles HCl = concentration of HCl x volume of HCl
= 0.0148 mol/L x 0.01810 L
= 0.00026788 mol
Since the reaction is 1:1 between OH- and HCl, the number of moles of OH- in the sample is equal to the number of moles of HCl that were added during the titration:
moles OH- = 0.00026788 mol
Convert the number of moles of OH- to ppm of CaCO3:
ppm CaCO3 = (moles OH-) x (1000000 ppm / 1 mol OH-) x (100 g CaCO3 / 2 mol OH-) x (1 L / 50.00 mL)
ppm CaCO3 = 267.88 ppm
Calculate the p-alkalinity:
p-alkalinity = 14 - log(ppm CaCO3)
= 14 - log(267.88)
= 12.57
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2 KCIO3 = 2 KCI + 3 O2
If 12.0 grams of potassium chlorate decompose, how many grams of potassium chloride will be
produced? Round your answer to the nearest hundredths.
Answer:
7.30g Potassium Chloride (KCl)
Explanation:
You are given 12.0 grams of KClO3, so start with that!
12g KClO3[tex]\frac{12g KClO3}{ } \frac{1 mol KClO3}{122.55g} \frac{2 mol KCl}{2 mol KClO3} \frac{74.55g KCl}{1 mol KCl} = 7.299877601[/tex]≈7.30
what alkene would yield 2,2-dimethoxycyclopentane-1,3-dicarbaldehyde on treatment with o3 followed by (ch3)2s?
The alkene that would yield 2,2-dimethoxycyclopentane-1,3-dicarbaldehyde on treatment with O3 followed by (CH3)2S is 2-methyl-2-pentene.
The reaction scheme is as follows:
2-methyl-2-pentene → O3 → (CH3)2S → 2,2-dimethoxycyclopentane-1,3-dicarbaldehyde.
2-Methyl-2-pentene is an organic compound that belongs to the category of alkenes. It is a saturated hydrocarbon, meaning it contains only single bonds between the carbon atoms. The chemical formula for 2-methyl-2-pentene is C5H10 and it is composed of two carbon-carbon double bonds. It has a boiling point of 63.2 °C, a melting point of -81.2 °C, and a density of 0.719 g/cm3. It is a colorless liquid at room temperature and has a sweet, gasoline-like odor. It is insoluble in water, but it can be dissolved in organic solvents such as ethanol and ether. 2-Methyl-2-pentene is commonly used as a starting material for the synthesis of other organic compounds, such as aldehydes, ketones, and alcohols.
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the reaction of 5.50 g of carbon with excess o2 yields 13.7 g of co2. what is the percent yield of this reaction?
The reaction of 5.50 g of carbon with excess o2 yields 13.7 g of co2. The percent yield of this reaction is 58.75%
To find the percentage yield of 5.50 grams of ethyl butyrate:
Percentage yield= (actual yield/Theoretical yield)*100
so we find Theoretical yield
Butanoic acid has a molecular weight of 88 g/mol.
Ethyl butyrate's atomic weight (molecular weight) is 116 g/mol.
The 7.10 grammes of butanoic acid are completely consumed by the chemical process because we are anticipating a yield of 100 percent.
Therefore, we would calculate the amount of butanoic acid used in moles:
Number of moles= mass/molar mass
Number of moles =7.10/88
=0.0807moles
The amount of ethyl butyrate that would result from this chemical reaction would then be calculated:
Ethyl butyrate is equal to 1 mole of butanoic acid.
Ethyl butyrate is equal to 0.0807 moles of butanoic acid.
Mass= Number of molar mass* mass
=0.0807*13.7
9.361grams
so percentage yield= (actual yield/Theoretical yield)*100
=(5.50/9.361)*100
=58.75%
Percent yield = 58.75%
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Round off the following numbers to three significant figures.
40.009????????
Answer:
40.0
40.009 contains 5 significant figures and 3 decimals. 40.009 rounded to 4 sig figs is 40.01, to 3 sig figs is 40.0, and to 2 sig figs is 40.. To count the number of sig figs in 40.009, count all 5 digits since it has no insignificant digits (all digits are significant).
SEP Develop a Model Mountain climbers need really warm clothing because it
gets colder at higher altitudes. Sketch molecular models for equal-mass samples of
air at different altitudes. Use your models to show why there might be less energy
in the samples at higher altitudes.
Answer:
At lower altitudes, the air molecules are closer together and have more energy due to their increased interactions with each other. At higher altitudes, the air molecules are more spread out and have less energy due to their decreased interactions with each other. This can be represented by sketching molecular models of air at different altitudes.
At lower altitudes, the molecules are represented by a dense, tightly packed arrangement. At higher altitudes, the molecules are represented by a more spread out, less dense arrangement. This difference in density and energy can be seen in the models, and it explains why there is less energy in the samples at higher altitudes.
if a reaction is first order with a rate constant of 0.0450 s⁻¹, how much time is required for 65% of the initial quantity of reactant to be consumed?
It will take approximately 26.5 seconds for 65% of the initial quantity of reactant to be consumed in this first-order reaction.
The integrated rate law for a first-order reaction is:
ln([A]t/[A]0) = -kt
where [A]t is the concentration of a reactant at time t, [A]0 is the initial concentration, k is the rate constant, and ln is the natural logarithm.
To solve for t when 65% of the initial quantity of reactant is consumed, we can use the following steps:
Determine the concentration of reactant remaining after 65% is consumed:
[A]t = (1 - 0.65) [A]0 = 0.35 [A]0
Rearrange the integrated rate law to solve for time t:
t = -ln([A]t/[A]0) / k
Substitute the given values and solve for t:
t = -ln(0.35) / 0.0450 s⁻¹
t ≈ 26.5 seconds
Therefore, it will take approximately 26.5 seconds for 65% of the initial quantity of reactant to be consumed in this first-order reaction.
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which of the gases has the fastest‑moving molecules, on average, at a given temperature?
HBr
NO2
C2H6
They all have same average speed
C2H6 is the gas having the fastest‑moving molecules, on average, at a given temperature because of its lower molecular mass
With the chemical formula C 2H 6, ethane is an organic chemical substance. Ethane is a colourless and odourless gas at ordinary temperature and pressure. Ethane is separated from natural gas on an industrial scale, and it is produced as a by-product of the petrochemical process used to refine crude oil.
The mass of a certain molecule is its molecular mass, which is expressed in daltons. Because different isotopes of an element 30.07 g in 1 mole C2H6 are present in different molecules of the same chemical, their molecular weights might vary. As a result, we state that ethane has a molar mass of 30.07 g/mol (grammes per mole).
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Explain how the basic laws of matters led to the formulation of daltons atomic theory
Dalton's Atomic Theory proposed a model of the atom as a small, indivisible, and indestructible particle. This theory was based on a set of observations and experiments that followed from the basic laws of matter.
One of the key observations was the law of definite proportions, which states that the proportions of elements in a compound are always the same regardless of the amount or source of the compound. For example, water always consists of two hydrogen atoms and one oxygen atom, no matter where it comes from or how much is present. This observation led to the conclusion that elements combine in fixed ratios to form compounds, suggesting that the elements themselves must be made up of individual, uniform particles.
Another important observation was the law of conservation of mass, which states that the total mass of a system remains constant during a chemical reaction, indicating that matter cannot be created or destroyed. This led to the conclusion that chemical reactions involve the rearrangement of individual particles, rather than the creation or destruction of matter.
Finally, the law of multiple proportions, which states that when two elements combine to form more than one compound, the ratio of the masses of one element that combine with a fixed mass of the other element is always a ratio of small whole numbers. This observation led to the conclusion that elements could combine in different ratios to form different compounds, suggesting that the elements must consist of individual particles with different masses.
Based on these observations, Dalton proposed his Atomic Theory, which stated that:
All matter is made up of atoms, which are small, indivisible particles.Atoms of a given element are identical in size, mass, and other properties.Atoms cannot be created, destroyed, or transformed into atoms of another element.Atoms of different elements combine in fixed ratios to form compounds.Chemical reactions involve the rearrangement of atoms, but no creation or destruction of matter occurs.Overall, Dalton's Atomic Theory was an attempt to explain the basic laws of matter through a model of the atom as a small, indivisible, and indestructible particle that could explain the chemical behavior of elements and compounds. It provided a framework for understanding the behavior of matter and set the stage for further research into the nature of the atom and the fundamental principles of chemistry.
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