A mixture of CO₂ and Kr weighs 35.0 g and exerts a pressure of 0.708 atm in its container. Since Kr is expensive, you wish to recover it from the mixture. After the CO₂ is completely removed by absorption with NaOH(s), the pressure in the container is 0.250 atm. How many grams of CO₂ were originally present? How many grams of Kr can you recover?
Answers
17.15 g of CO2 is originally present, and 17.85 g of Kr is recovered.
Since it is given that carbon dioxide is completely removed by absorption with NaOH. And, the pressure inside the container is 0.250 atm.
For Kr = 0.250 atm and pressure CO2 will be calculated as follows.
CO₂ = (0.708-0.250) atm
= 0.458 atm
Now, we will calculate the mole fraction as follows.
CO₂ = 0.458/ 0.708
= 0.646
Kr= 0.250/0.708
= 0.353
Now, we will convert it into a gram fraction as follows.
CO₂ = 0.646 x 44
= 28.424
Kr =0.353 x 83.78
= 29.57
Therefore, the total mass is calculated as follows.
Total mass = (28.424 +29.57)
= 57.994
Hence, the percentage of CO2 and Kr is calculated as follows.
CO₂ = 29/58 x 100
= 49%
Kr = 29.57/58 x 100
= 51%
Hence, the amount of CO2 and Kr present in the mixture is as follows.
CO2 in mixture 35 x 0.49
= 17.15 g
Kr = 35 x 0.51
= 17.85 g
Thus, we can conclude that 17.15 g of CO2 is originally present, and 17.85 g of Kr is recovered.
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Related Questions
What are the coefficients that will balance the skeleton equation below?
AlCl3 + NaOH → Al(OH)3 + NaCl
a) 3, 1, 3, 1
b) 1, 3, 1, 3
c) 1, 1, 1, 3
d) 1, 3, 3, 1
Answers
Answer:
B
Explanation:
AlCl3 + NaOH → Al(OH)3 + NaCl
a) 3, 1, 3, 1
b)1, 3, 1, 3
c) 1, 1, 1, 3
d) 1, 3, 3, 1
cause there are 3Cl= AlCl3; NaCl must be 3 as well
So answers (a) and (d) are wrong
Then cause it is 3NaCl and there are (OH)3 so it must be 3NaOH.
Sahil watched a demonstration in which a scientist combined two substances in a sealed container and analyzed the results. The ending substances did not look the same as the starting substances.
Sahil was given a diagram with the repeating groups of atoms that make up the starting substances, plus information about the properties of the starting and ending substances. He created a model of the repeating groups of atoms that might make up the two ending substances.
Does his model correctly show why the properties of the ending substances are different from the properties of the starting substances?
Answers
Samira's model accurately depicts how the characteristics changed when the atoms were rearranged.
What is model?A model (most occasionally referred to just as a model, although distinct from a mental model in this context) is a bigger or smaller physical replica of an item. The simulated item might be tiny (for example, an atom) or huge (for example, the Solar System).
A physical model, in some respects, "is always the post structuralist of some mental model; the prototype is thought ahead as the blueprints of the physical one," which is then built as intended. Samira's model accurately depicts how the characteristics changed when the atoms were rearranged.
Therefore, samira's model accurately depicts how the characteristics changed when the atoms were rearranged.
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How much heat is required to change temperature of 10 g of water from 4 °C to 8 °C? (Water has a specific heat of 4.18 )?
Answers
Answer: 167.2 J
Explanation:
You were given a 100. G wine sample to verify its age. Using tritium dating you observe that the sample has 0. 688 decay events per minute. Tritium has a half life of 12. 3 and fresh water exhibits 5. 5 decay events per minute per 100g. What year was the wine produced?.
Answers
Wine was produced 37 years ago (1984 as usual year 15,2021) that is shown in the calculations below.
Reaction rate is calculated using the formula rate = Δ[C]/Δt, where Δ[C] is the change in product concentration during time period Δt. The rate of reaction can be observed by watching the disappearance of a reactant or the appearance of a product over time.
The time can be represented as follows:
t= 2.303\∧ log A0/A
∧= 0.693/t 1/2
The rate of a reaction is proportional to the reciprocal of the time taken. Rate α 1 time Rate is inversely proportional to time. Units: s-1, min-1 etc.
The given parameters are as follows:
t1/2=12.3
A0=5.5
A=0.688
t= 2.303/(0.693/12.3) log (5.5/0.688)
t=36.9
t=37 years
Thus, wine was produced 37 years ago (1984 as usual year 15,2021)
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Which is the correct Lewis dot structure for BeH2 ?
Answers
Since there are 4 valence electrons in total, Beryllium has 2 and Hydrogen has 2. You would put the Be in the middle because there is only 1 of them.
The correct Lewis dot structure for \(BeH_2\) is Be : H : H
What does the Lewis dot structure show?The Lewis dot structure shows the valence electrons as dots. The valence electrons of beryllium are shown as 2 dots on the left side of the atom.
The central atom, beryllium, has 2 valence electrons where each hydrogen atom has 1 valence electron. To form a stable molecule, beryllium shares its 2 valence electrons with the 2 hydrogen atoms, each of which shares its 1 valence electron with beryllium which gives each atom a full outer shell of electrons.
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Ethanol and biodiesel are two liquid biofuels that are currently in use in the transportation industry either in neat or blended forms. Outline the biochemical steps in the production of ethanol from a first generation feedstock. Compare the process (without giving details) to the production of biodiesel from indigenous feedstock.
Answers
The feedstock used in the production of biodiesel is also different from that of ethanol, with biodiesel feedstocks being derived from indigenous sources such as plant oils or animal fats.
Biochemical steps in the production of ethanol from a first generation feedstock:
Ethanol is a biofuel that is made by the fermentation of glucose (C6H12O6) from sugar cane, wheat, or maize feedstocks. These feedstocks are first pretreated before the conversion process. The process of producing ethanol can be divided into five main steps as outlined below:
1. Pretreatment: In the first step, the feedstock undergoes pretreatment that helps to remove lignin, hemicellulose, and other impurities that are present in the plant cell wall. This step exposes the cellulose component to the enzymatic hydrolysis process.
2. Enzymatic hydrolysis: In this step, the cellulose component is converted into glucose using enzymes that break down the cellulose molecule into smaller glucose molecules.
3. Fermentation: After hydrolysis, the glucose is converted to ethanol by fermentation. The fermentation process is carried out by yeast or bacteria, which converts the glucose to ethanol through the process of anaerobic respiration.
4. Distillation: Once the ethanol is produced, it is then distilled to separate the ethanol from the water and other impurities.
5. Dehydration: In this final step, the water is removed from the ethanol using a dehydration process to obtain a pure form of ethanol. Compare the process (without giving details) to the production of biodiesel from indigenous feedstock.
Biodiesel is a biofuel that is made from plant oils or animal fats through a process known as transesterification. In the transesterification process, the triglycerides in the feedstock are reacted with an alcohol, usually methanol, to produce fatty acid methyl esters (FAMEs) and glycerol.
The FAMEs are then separated from the glycerol by distillation to produce biodiesel. The production of biodiesel is quite different from that of ethanol as it involves the use of transesterification to produce the biofuel.
The feedstock used in the production of biodiesel is also different from that of ethanol, with biodiesel feedstocks being derived from indigenous sources such as plant oils or animal fats.
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23. In a linked-based implementation of the ADT list with a tail reference, what is the performance of adding an entry at the end of the list?
a. O(1)
b. O(log n)
c. O(n) d. O(n 2 )
Answers
In a linked-based implementation of the ADT list with a tail reference, what is the performance of adding an entry at the end of the list, the correct option is (a) O(1).
The performance of adding an entry at the end of the list in a linked-based implementation of the ADT list with a tail reference is O(1), which means it is constant time complexity. This is because with a tail reference, we can easily access the last node in the list and add a new node after it without having to traverse through the entire list.
A queue is the abstract data type (ADT) is most suitable to store a list of perishable products such that the product with the nearest expiry date is removed first.
In a linked-based implementation of the ADT list with a tail reference, what is the performance of adding an entry at the end of the list, the correct option is (a) O(1) .
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which scientist concluded that all cells came from existing cells?
Please help!!
Answers
Answer:
Theodor Schwann
Explanation:
The classical cell theory was proposed by Theodor Schwann in 1839. There are three parts to this theory
The reaction below proceeds spontaneously at 298 K. NH3(g) Cl2(g)Right arrow. NH4Cl(s) What is the sign of the entropy change, Delta. S? Delta. S is negative because the product is less random than the reactants. Delta. S is negative because the reactants are less random than the product. Delta. S is positive because the product is less random than the reactants. Delta. S is positive because the reactants are less random than the product.
Answers
A spontaneous reaction favours the product formation and increases the entropy of the isolated system. The sign of the entropy change will be negative as the product formation is less random.
What is entropy?Entropy is the degree of the disorder or randomness that occurs in the system that lacks available energy and cannot convert the mechanical energy or work.
The entropy of the reaction will be negative as the reactants are present in the gaseous state and the product formed is solid. The product formation was spontaneous and less random.
Therefore, option a. entropy will be negative as product formation is less random.
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carbon dioxide and particulates are emitted by volcanoes. particulates form stratospheric aerosols that reflect sunlight. which of the following best describes the impact of atmospheric carbon dioxide and stratospheric aerosols?
Answers
Carbon dioxide and particulates are emitted by volcanoes. Particulates form stratospheric aerosols that reflect sunlight The impact of atmospheric carbon dioxide and stratospheric aerosols can be briefly described below.
Carbon dioxide (CO₂): Carbon dioxide is a greenhouse gas that contributes to the greenhouse effect and global warming. It is released into the atmosphere through various human activities, such as the burning of fossil fuels and deforestation. The increasing concentration of CO₂ in the atmosphere is a significant driver of climate change.
Stratospheric aerosols: Stratospheric aerosols, formed by the release of particulates from volcanic eruptions or human activities, can have a cooling effect on the Earth's climate. These aerosols reflect sunlight back into space, reducing the amount of solar radiation that reaches the Earth's surface. As a result, they can temporarily offset some of the warming caused by greenhouse gases like CO2.
It's important to note that while stratospheric aerosols can have a cooling effect, they are relatively short-lived in the atmosphere compared to CO₂. Carbon dioxide, on the other hand, has a long residence time and accumulates over time, leading to long-term warming.
Therefore, the overall impact of increasing atmospheric CO₂ concentrations outweighs the cooling effect of stratospheric aerosols.
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Rx Ephedrine sulfate (fz. pt = -0.13°C). 2%
Sodium chloride MW 58.5
Purified water qs ad. 30 mL
How much sodium chloride should be used to make this eye
solution isotonic with tears?
the answer is 22
Answers
The correct answer is the amount of sodium chloride needed to make this eye solution isotonic with tears is approximately 1.85 grams. Rounding it up to the nearest whole number gives us the answer as 2. Hence, the correct option is 22.
The given solution is a hypotonic solution as the solution's tonicity is lower than that of the tears. The tears contain 0.9% w/v of NaCl, which is isotonic with tears. So, to make the given solution isotonic, the amount of sodium chloride needs to be added.
The concentration of NaCl in tears is 0.9% w/v. Additional Information: We know that % w/v is the amount of solute present in grams per 100 ml of the solution. Therefore, 0.9% w/v means 0.9 grams of NaCl is present in 100 mL of tears.
To make 30 ml of isotonic solution, we can use the following formula: Equivalent weight of NaCl = 58.5/2 = 29.25 (as NaCl ionizes to give Na+ and Cl- ions)Moles of NaCl required to make 30 ml isotonic solution = 0.9 × 30 / 1000 = 0.027Moles of Na+ and Cl- ions present in 30 mL of isotonic solution = 2 × 0.027 = 0.054
A number of grams of NaCl needed to prepare 30 mL of isotonic solution is calculated as follows:0.054 g = (0.027 x 29.25 x X) / 1000Where X is the amount of NaCl required to make 30 mL isotonic solution. Solving this equation gives us: X = 1.85 g (approx). Therefore, the amount of sodium chloride needed to make this eye solution isotonic with tears is approximately 1.85 grams. Rounding it up to the nearest whole number gives us the answer as 2. Hence, the correct option is 22.
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What is one common reaction to all hydrocarbons?
Answers
Answer:
Common properties of hydrocarbons are the facts that they produce steam, carbon dioxide and heat during combustion and that oxygen is required for combustion to take place. The simplest hydrocarbon, methane, burns as follows: CH4 + 2 O2 → 2 H2O + CO2 + energy.
Explanation:
90cm3 of 1 m hcl solution and 10cm3 of 0.5 m naoh solution are mixed together. the concentration of hcl contained in the final solution
Answers
The concentration of HCl contained in the final solution is 0.95 M.
Calculation:Here, we use the dilution formula, which is,
M (V₁ + V₂) = M₁V₁ + M₂V₂
where,
M = resultant concentration
M₁ = concentration of HCl
V₁ = volume of HCl
M₂ = concentration of NaOH
V₂ = volume of NaOH
Given,
M₁ = 1 M
V₁ = 90 cm³ = 90 mL
M₂ = 0.5 M
V₂ = 10 cm³ = 10 mL
To find,
M =?
Put the values in the above formula,
M (V₁ + V₂) = M₁V₁ + M₂V₂
M (90 + 10) = (1 × 90) + (0.5 × 10)
M × 100 = 90 + 5
M × 100 = 95
M = 95/100
M = 0.95 M
Therefore, the concentration of HCl contained in the final solution is 0.95 M.
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Which of the following salts when dissolved in water will form a solution that will change blue litmus to red?
A. CH3COONa
B. NH4Cl
C. NaCl
D. KCl
Answers
Answer:
B. NH4CI
Explanation:
Select the correct answer.
In this reaction, what effect does a change in the concentration of substances have on the reverse reaction rate?
CaCO3(s) ⇌ CaO(g) + CO2(g)
A.
The rate of the reverse reaction increases with an increase in the concentration of CaCO3(s).
B.
The rate of the reverse reaction increases with an increase in the concentration of CaO(g) and CO2(g).
C.
The rate of the reverse reaction decreases with a decrease in the concentration of CaCO3(s).
D.
The rate of the reverse reaction decreases with an increase in the concentration of CaO(g) and CO2(g).
E.
The rate of the reverse reaction increases with a decrease in the concentration of CaO(g) and CO2(g).
Answers
Answer:
A. The rate of the reverse reaction increases with an increase in the concentration of CaCO3(s)
Explanation:
If the concentration of a reactant has increased, The substance will shift in the direction of the reaction that uses the reactants, So that the Reactants substance Increases.
The loss of part or all of a forest, _____, is a major threat to biodiversity.
1)Deforestation
2)Damming
3)Drainage
4)Poaching
Answers
Answer: #1 deforestation
Explanation:
zinc crystals is made from zinc Oxide and which acid
Answers
Answer:
hydrochloric acid
Explanation:
Zinc oxide will react with hydrochloric acid to form zinc chloride and water.
sulphuric acid
So to make zinc sulphate crystals you add granulated zinc to heated sulphuric acid
Two students are having a tug of war. The flag on the rope begins at point Y. team A pulls to the left with force of 120 N. Team B pulls to the right with force of 160 N. Based on these forces, which letter shows the likely movement of the flag?
Choices:
A: W
B: X
C: Y
D: Z
(Please help!!) 20 points
Answers
How does the strength
of the force effect the
velocity of the object?
Answers
Answer:
nertial mass is a measure of how difficult it is to change the velocity of an object. Example. Calculate the force needed to accelerate a 22 kg cheetah at 15 m/s².
Explanation:
What is the empirical formula of the following molecule? C12H24O20 (this does not require moles to solve)
6) Find the empirical formula for a compound which contains 32.8% chromium and 67.2% chlorine.
7) Calculate the empirical formula of a compound is 40% Calcium, 12% Carbon and 48% Oxygen.
Answers
The simplest proportion of the components of a molecule is shown in an empirical chemical formula instead of the overall amount of atoms within the molecule.
Describe an element?Primary constituent of a whole. refers to a straightforward substance that can't be divided into smaller components or transformed into another substance in chemistry. An atom, which is made up of protons, neutrons, and electrons, is the fundamental unit of an element. An element's atoms all contain the same number atomic protons.
An atom is what?The smallest component of an object that cannot be destroyed chemically. The centre of every atom is called the nucleus, and it is made up of neutrons and protons. The nucleus is filled with electrons, which are negative particles.
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Classify the following type of stoichiometry problem: How many cubic centimeters of oxygen are produced from decomposing 5.00 mL of steam? (Sec.9.3)
(a) mass–mass problem
(b) mass–volume problem
(c) volume–volume problem
(d) mole–mole problem
(e) none of the above
Answers
Answer:
volume problem
Explanation:
cubic usually means volume
Calculate the mass of an object that has a density of 3.52g/cm^3 and
a volume of 5000 cm^3. Note that Mass = Volume X Density
Answers
Answer:
17.6kg
Explanation:
mass = Volume × Density
mass = 5000cm^3 × 3.52g/cm^3
mass = 17600g = 17.6kg
during a synthesis reaction, 3.2 grams of magnesium reacted with 12.0 grams of oxygen. what is the maximum amount of magnesium oxide that can be produced during the reaction? mg o2 → mgo (5 points)
Answers
In a synthesis reaction, 3.2 grams of magnesium combined with 12.0 grams of oxygen. The maximum amount of magnesium oxide that can be produced in this reaction is 5.33 grams,
The balanced chemical equation for the synthesis of magnesium oxide is 2 Mg + O2 → 2 MgO.
According to this equation, 2 moles of magnesium react with 1 mole of oxygen to produce 2 moles of magnesium oxide. To determine the maximum amount of magnesium oxide produced, the given masses of magnesium and oxygen are converted into moles using their respective molar masses.
The molar mass of magnesium (Mg) is approximately 24.31 g/mol, and the molar mass of oxygen (O2) is around 32.00 g/mol. By dividing the given mass of magnesium (3.2 grams) by its molar mass, we obtain approximately 0.132 moles of magnesium.
Similarly, dividing the given mass of oxygen (12.0 grams) by its molar mass, we obtain approximately 0.375 moles of oxygen. Since the ratio between magnesium and magnesium oxide is 1:1, the amount of magnesium oxide produced will be equal to the amount of magnesium used. Therefore, the maximum amount of magnesium oxide that can be produced during the reaction is approximately 0.132 moles. Converting this to grams using the molar mass of magnesium oxide (40.31 g/mol), we find that the maximum amount of magnesium oxide produced is approximately 5.33 grams.
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What mass loss would you expect from a reaction between 10.04g of calcium carbonate and 20cm3 of 1m hydrochloric acid
Answers
Based on the law of conservation of mass, there is no loss in mass in the reaction, however carbon dioxide gas is evolved.
What is the law of conservation of mass?The law of conservation of mass states that for a chemical change occurring, the sum of masses before and after the reaction is constant.
Based on the law of conservation of mass, the reaction between 10.04g of calcium carbonate and 20cm3 of 1m hydrochloric acid will have the same mass before and after the reaction. Any change in mass will be due to evolution of carbon dioxide gas.
Therefore, there is no loss in mass in the reaction, however carbon dioxide gas is evolved.
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The most valuable part of the carcass is the
Answers
Answer:
The rib and loin, because of their palatability and diversity in how they can be used--especially on the market.
Explanation:
mira added vanilla flavored liquid to a cake and heated . The resulting cake is having vanilla flour. What could have happened
Answers
The change in the taste of the cake to vanilla flour is an example of a chemical change.
What are chemical changes?Chemical changes are changes which occur when substances undergo changes that are no easily reversible an in which new substances are formed.
During chemical changes, large amounts of heat changes occur.
Some example of chemical changes is in the rusting of iron, the baking of breads and cake from a mixture of flour sugar and various flavors.
In the given scenario, Mira added vanilla flavored liquid to a cake and heated which resulted in a cake is having vanilla flour. The change in the taste of the cake after the vanilla flavor was added and the cake heated is an example of a chemical change.
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recall that your chambers had a set amount of co2 entering each chamber and then you measured how much co2 was exiting the chamber. suppose you conduct your experiment and discovered one of your chambers had a lower in-flow of air relative to the other chambers. what would this do to your data in that chamber?
Answers
If the chambers had a lower in-flow of air relative to the other chambers, then it would bias the results toward less photosynthesis in the chamber with a lower in-flow of air. Thus, c is the correct option.
A result of lower in-flow of air would result in a decrease in the availability of carbon dioxide, which is an important component for photosynthesis.
Photosynthesis is the process used by plants, algae and some other bacteria to convert sunlight into energy. The process chemically converts carbon dioxide and water into food (sugars) and oxygen. Chlorophyll is the pigment which gives plants their green colour and is essential for the chemical reactions inside the plant.
If the in-flow of air in a chamber is reduced, the concentration of carbon dioxide which is present in the plant would also decrease. Subsequently, the plant would take up less carbon dioxide and release less oxygen as the rate of photosynthesis would decrease.
Therefore, the chamber has lower rates of photosynthesis and higher rates of respiration, as the plant would still need to perform cellular respiration to produce energy, even after the reduction in photosynthesis.
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The complete question is:
Recall that your chambers had a set amount of co2 entering each chamber and then you measured how much co2 was exiting the chamber. suppose you conduct your experiment and discovered one of your chambers had a lower in-flow of air relative to the other chambers. what would this do to your data in that chamber?
a.) It would bias the results towards more photosynthesis
b.) It would not change the results
c.) It would bias the results towards less photosynthesis
d.) It would bias the results toward more respiration
geologists attempting to locate metallic mineral resources such as copper and iron will first consider the ____ of the rock and how it formed.
Answers
Minerals can be located using geochemical surveys and remote sensors that analyze satellite images. Following that, mining or quarrying is used to remove many minerals.
What do you do to find mineral resources first?Search for Potential Deposits, Locating areas that are likely to contain mineral deposits is one of the first steps in the exploration process. Prospective areas might be close to other known mineralization areas or to active mine sites because mineral deposits frequently form in clusters.Minerals can be located using geochemical surveys and remote sensors that analyze satellite images. Following that, mining or quarrying is used to remove many minerals. Pumping, however, can be used to extract liquid minerals like oil or gas.When choosing which deposit to pursue, some factors include the deposit's location and shape, the rock's strength, the grade of the ore, the costs associated with mining it, and the commodity's current market price.To learn more about minerals refer to:
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Peer-reviewed papers are considered trustworthy because they
A.Have more than one author incorrect answer
B.Prove their hypotheses incorrect answer
C.Have been checked by other scientists
D.are published frequently
Answers
If you observed a beam of particles being bent towards a negatively
charged plate, what might you conclude?
Answers
Answer:
The particles did not have a positive charge.