You only need to know first is the vapor pressure of water at that boiling point which is ~ 179 mm hg.
So the (vapor pressure of C2H5I = 760 – 179)
And since you know the molecular weight of H2O which is equal to18 g/mol and the molecular weight of C2H5I = 156 g/mol.
Just apply the equation:
grams H2O M.W. H2O ×
P H2O
---------------------- =
-------------------------- = 28.13 grams C2H5I
grams C2H5I M.W. C2H5I
× P C2H5I
To determine the weight of ethyl iodide carried over by 1 g of steam during steam distillation, we need to calculate the mole fraction of ethyl iodide in the mixture and multiply it by the weight of the steam.
Explanation:The boiling point of a solution can be determined using Raoult's law, which states that the vapor pressure of a solvent above a solution is equal to the product of the mole fraction of the solvent and the vapor pressure of the pure solvent. In this case, we are looking for the weight of ethyl iodide carried over by 1 g of steam during steam distillation. Since the mixture of ethyl iodide and water boils at 63.7°C, we know that the vapor pressure of ethyl iodide at 63.7°C is equal to the vapor pressure of steam at that temperature.
To determine the weight of ethyl iodide carried over by 1 g of steam, we need to calculate the mole fraction of ethyl iodide in the mixture. We can use the equation:
mole fraction of ethyl iodide = weight of ethyl iodide / weight of ethyl iodide + weight of water
Once we have the mole fraction of ethyl iodide, we can multiply it by the total weight of the steam (1 g) to find the weight of ethyl iodide carried over.
The half-life of substance-X is 5 minutes. If you start with 20g of substance-X, how much substance-X is leftover after 5 minutes? How about 10 minutes?
Food labels list the amount of carbohydrates, fats, and proteins, but not nucleic acids. why not
Which trait would most likely lead scientists to investigate folk remedies of tribes living in rain forest for new medicine
The trait that would most likely lead scientists to investigate folk remedies of tribes living in rainforest for new medicine is openness. Option 1 is correct.
This trait encompasses curiosity, originality, intellectualism, creativity, and a willingness to embrace new ideas. It is the capacity for openness that prompts scientists to explore indigenous knowledge and integrate it into scientific inquiry.
Traditional practices, such as those employed by Northwestern North American Indigenous peoples who used seawrack on burns and broadleaved plantain on insect bites, may stem from both trial and error and an empirical understanding of natural resources. Openness allows for the consideration of these methods as part of 'real science,' emphasizing their testable and evidence-based nature.
People with high levels of openness thrive in flexible situations and are motivated to learn new things, which aids in the acceptance of and adaptation to novel environments. This characteristic is essential for scientists who are delving into folk remedies and evaluating them under the rigorous conditions of scientific research.
Hence, 1. is the correct option.
The complete question is:
Which trait would most likely lead scientists to investigate folk remedies of tribes living in rain forest for new medicine? 1. openness 2. narrow-minded 3. creativity 4. skepticism
What is one difference between a mixture and a compound? 1. a compound consists of more than one phase. 2. a mixture can only be separated into its components by chemical means. 3. a compound can only be separated into its components by chemical means. 4. a mixture must be uniform in composition?
When you dissolve solid sugar into water, this new solution will taste sweet. the sugar went through a chemical change?
Which elements likely conduct electricity well? Check all that apply.
chromium
iodine
carbon
calcium
osmium
Answer : Option A) Chromium
Option D) Calcium
Option E) Osmium
Explanation : The elements likely conduct electricity well are chromium, calcium and osmium. As these are metals and are observed to be good conductors of heat and electricity. They have extra electrons to donate and hence flow of electrons cause them to be a good conductor of electricity. Rest iodine is a non-metals which is not good conductors of electricity. Carbon is not itself a good conductor but one of its allotrope which is graphite is a good conductor of electricity.
Which quantity expresses the sum (2.1 g + 33.566 g + 12.22 g) to the proper degree of precision
First let us get the sum of the numbers.
2.1 g + 33.566 g + 12.22 g = 47.886 g
Now to get the proper degree of precision, the amount of decimal places should be equal to the least decimal places of the numbers that were added. In this case, 2.1 g has the least number of decimal places which is equal to 1, hence the correct answer is:
47.9 g
The sum of (2.1 g + 33.566 g + 12.22 g) to the proper degree of precision is 47.9 g.
Explanation:The sum of (2.1 g + 33.566 g + 12.22 g) to the proper degree of precision is 47.886 g. The numbers given in the question have different decimal places. To determine the proper degree of precision, we look at the least precise measurement, 2.1 g, expressed to the tenth place. Therefore, the final answer should be rounded to the tenth place, giving us 47.9 g.
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How many helium atoms are there in a helium blimp containing 540 kg of helium?
The answer is 8.13 x 10²⁸ atoms.
First we calculate the number of moles using the molar mass.
molar mass of helium = 4 g/mol.
it means that 1 mole of helium atoms weighs 4 gram.
Now we have 540 kg of helium =540000 grams
Number of moles in 540000 grams;
540000 / 4 =135000 mol
Now in one mole there is 6.02 x 10²³ atoms
So, in 135000 mol there is;
135000 x 6.02 x 10²³ = 8.13 x 10²⁸atoms
The open spaces in water's crystal structure make it possible for
Final answer:
The open spaces in ice's crystal structure contribute to its lower density compared to liquid water, allowing ice to float and providing insulation for aquatic life. Water's polarity makes it an excellent solvent for many substances, supporting life by enabling the distribution of vital nutrients and facilitating biochemical processes.
Explanation:
The open spaces in water's crystal structure make it possible for a variety of environmental and biological processes. Ice is less dense than liquid water due to its open, cage-like structure caused by hydrogen bonding. This unique property allows ice to float, creating an insulating layer on bodies of water that protects aquatic life during cold temperatures. Additionally, because water is a polar molecule, it is an excellent solvent. For instance, when sodium chloride (table salt) is placed in water, the water molecules interact with the ions in the crystal lattice and dissolve into the water, creating spheres of hydration around them.
This ability of water to serve as a solvent is crucial for life on Earth. Substances can easily disperse in water due to its molecular structure, providing essential nutrients for organisms and allowing for critical biochemical processes to occur in living organisms.
Furthermore, water's properties such as surface tension and the ability to undergo osmosis are vital for many forms of life, playing key roles at the cellular level and within ecosystems as a whole.
What are the advantages and disadvantages of using a net ionic equation to represent a chemical change rather than a molecular equation?
Advantage: Net ionic equations focus on the essential chemical species involved, simplifying complex reactions.
Disadvantage: They may omit important details, making them less suitable for comprehensive analysis.
Advantages of using a net ionic equation to represent a chemical change:
Clarity and Simplicity: Net ionic equations focus on the species that are directly involved in the chemical reaction, ignoring spectator ions that do not participate. This simplifies the equation, making it clearer and easier to understand.Emphasis on Reactants and Products: Net ionic equations emphasize the actual chemical change by showing the relevant ions or molecules that undergo transformation. This helps in identifying the key species involved.Balancing: Net ionic equations are often easier to balance because they only involve the species that participate in the reaction. This simplifies the process of ensuring that mass and charge are conserved.Useful for Identifying Reaction Type: Net ionic equations can help in identifying the type of chemical reaction (e.g., precipitation, acid-base, redox) more readily because they highlight the relevant ions or molecules.Disadvantages of using a net ionic equation:
Incomplete Picture: While net ionic equations focus on the key species involved in a reaction, they do not provide a complete picture of the reaction. They omit spectator ions, which are essential for understanding the stoichiometry of the reaction.Limited Applicability: Net ionic equations are most useful for reactions that occur in solution, particularly in aqueous solutions. They may not be as applicable to reactions in other phases or non-aqueous environments.Limited Information: Net ionic equations do not provide information about the physical state (solid, liquid, gas) or the molecular structure of the species involved. Molecular equations or complete ionic equations may be needed for this information.May Require Additional Information: In some cases, particularly complex reactions, the net ionic equation alone may not provide sufficient information to fully understand the reaction. Additional contextual information or complete ionic equations may be needed.Learn more about Net Ionic Equation here:
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A net ionic equation provides a more concise representation of a chemical change by excluding spectator ions, making it easier to analyze and understand the reaction. However, it may overlook important information such as the overall ionic balance and the presence of certain ions. Molecular equations provide a more complete picture of the reactants and products, including all ions.
Explanation:A molecular equation represents a chemical change by showing all reactants and products as neutral substances. On the other hand, a net ionic equation only includes the dissolved ionic reactants and products that undergo a chemical or physical change, excluding spectator ions.
The advantage of using a net ionic equation is that it provides a more concise representation of the actual chemical change, focusing on the substances that are directly involved. This can make it easier to analyze and understand the reaction. Additionally, net ionic equations are particularly useful in determining the type of reaction, such as precipitation, acid-base, or redox reactions.
However, there are also disadvantages to using net ionic equations. By excluding spectator ions, some important information may be overlooked, such as the overall ionic balance and the presence of certain ions. Molecular equations, on the other hand, provide a more complete picture of the reactants and products, including all ions present in the reaction.
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You are confronted by a phosphorus atom. this atom has 15 protons and 17 neutrons. how many electrons does it have
The wavelength of light in the infrared region is 4.257 X 10 ⁻⁷cm. What is the frequency of this light? SHOW WORK
Answer: The frequency of the given light is [tex]7.05\times 10^{16}s^{-1}[/tex]
Explanation:
To calculate the frequency of light, we use the equation:
[tex]\nu=\frac{c}{\lambda}[/tex]
where,
[tex]\lambda[/tex] = wavelength of the light = [tex]4.257\times 10^{-7}cm=4.257\times 10^{-9}m[/tex] (Conversion factor: 1 m = 100 cm)
c = speed of light = [tex]2.998\times 10^8m/s[/tex]
[tex]\nu[/tex] = frequency of light
Putting values in above equation, we get:
[tex]\nu=\frac{3\times 10^8m/s}{4.257\times 10^{-9}m}\\\\\nu=7.05\times 10^{16}s^{-1}[/tex]
Hence, the frequency of the given light is [tex]7.05\times 10^{16}s^{-1}[/tex]
Chemist have developed a method of measuring the mass of an atom called what?
which of the following activities often starts the scientific process ?
a) publishing articles
b) learning new vocabulary
c) asking questions
d) summarizing data
Calculate the number of moles of hcl in 25.50 g of 1.0 m hcl solution. assume that the density of the hcl solution is 1.00 g/ml.
What happens to the shape of the hydrophobic tail in a phospholipid when a double bond is present in the carbon chain?
The presence of a double bond in the carbon chain of a phospholipid's hydrophobic tail causes the tail to become bent or 'kinked', which can increase the fluidity of the cell membrane.
Explanation:When a double bond is present in the carbon chain of the hydrophobic tail of a phospholipid, the shape of the tail changes. Specifically, the tail becomes bent or 'kinked'. This happens because double bonds restrict the rotation of the carbon atoms around the bond, causing the chain to bend. The presence of such double bonds can therefore influence the properties of the phospholipid and the cell membrane in which it is a part. For example, it can increase the fluidity of the membrane, since the bent tails do not pack together as tightly as straight tails do.
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Write a generic equation that can be used to convert the mass of a substance to volume using density.
A balloon is a sphere with a radius of 5.0 m.the force of the air against the wall of loan is 45 N. what is the air pressure inside the balloon ? (Surface area = 12.56 x radius 2, 1 Pa = N/m^2)
Answer:
1.4×10−1 Pa
Explanation:
An _____ generates heat for an entire building from one central source.
A heat pump generates heat for an entire building from one central source.
Explanation:An example of a system that generates central heat for an entire building is a heat pump. A heat pump uses a small amount of energy to move heat from a low-temperature source, such as the outside air, to a high-temperature source, such as the building's interior. It does this by using a compressor and a refrigerant to transfer heat energy.
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How did lavoisier revolutionize the science of chemistry?
You have 125 g of a certain seasoning and are told that it contains 48.0 g of salt. what is the percentage of salt by mass in this seasoning
What is the relationship between the electronic structure of a carbon atom and the variability of organic compounds?
Give an example of how environmental science might involve geology and chemistry.
Environmental science often integrates geology and chemistry to study and address environmental issues.
For example, in the context of water pollution, geology helps assess the types of rocks and soils present in an area, influencing water quality and contamination risks.
Chemistry analyzes the composition of pollutants and their reactions in aquatic systems, identifying harmful substances. Together, geology and chemistry help understand the sources, movement, and transformation of pollutants in groundwater and surface water.
This knowledge guides strategies for pollution prevention, cleanup, and sustainable water resource management, demonstrating how the combination of geology and chemistry contributes to effective environmental science solutions.
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Final answer:
Environmental science intertwines geology and chemistry through the study of weathering processes, where the breakdown and chemical transformation of rocks at Earth's surface illustrate the interplay between geological formations and chemical reactions.
Explanation:
An example of how environmental science might involve geology and chemistry is seen in the study of weathering processes. Weathering, a critical geochemical process, illustrates the interaction between Earth's geological and chemical elements. The decomposition and alteration of rocks and minerals at the Earth's surface involve both the physical breakdown (geology) and chemical transformations (chemistry), significantly influenced by water, air, and biological activity.
Particularly, chemical weathering involves the molecular breakdown of minerals, which changes their chemical composition under the influence of water and atmospheric gases. This process is pivotal for soil formation and nutrient cycling, thus demonstrating the intricate connections between geology and chemistry in environmental sciences.
Moreover, the application of geochemical methods in identifying and analyzing mineral content in ore bodies integrates geology and chemistry. Geologists use chemical information about minerals from specific locations to infer the ecological and environmental processes at play. This integration facilitates a deeper understanding of Earth's resources and environmental challenges, highlighting the importance of interdisciplinary approaches in solving complex ecological problems.
Write a balanced chemical reaction for the dissolution of your copper oxide sample in hydrochloric acid
Final answer:
When copper(II) oxide (CuO) is mixed with hydrochloric acid (HCl), it dissolves to form copper(II) chloride (CuCl2) and water (H₂O). The reaction is represented by the balanced chemical equation: CuO(s) + 2HCl(aq) → CuCl₂(aq) + H₂O(l), demonstrating an acid-base interaction resulting in salt and water.
Explanation:
When copper(II) oxide (CuO) dissolves in hydrochloric acid (HCl), a reaction occurs that forms copper(II) chloride (CuCl₂) and water (H₂O). This reaction is a type of double displacement reaction where the anion from the acid (Cl⁻) swaps with the anion of the base (OH⁻ from Cu(OH)₂), resulting in the dissolution of copper oxide in the acid. It's important to ensure the chemical equation is balanced to accurately represent the conservation of mass principle.
Steps to Balance the Equation
Write the unbalanced equation: CuO(s) + 2HCl(aq) → CuCl₂(aq) + H₂O(l)Check the balance of atoms on both sides of the equation. The copper (Cu), chlorine (Cl), oxygen (O), and hydrogen (H) atoms need to be equal on both sides.Adjust coefficients to balance the equation. Given the unbalanced equation already has the correct coefficients, it is therefore balanced as is.The correctly balanced equation representing the dissolution of copper(II) oxide in hydrochloric acid is: CuO(s) + 2HCl(aq) → CuCl₂(aq) + H₂O(l). This equation illustrates the interaction between a base (CuO) and an acid (HCl) that produces a salt (CuCl₂) and water, exemplifying an acid-base reaction.
What is the frequency of electromagnetic radiation having a wavelength of 3.27 ✕ 10-8 m? s-1 What type of electromagnetic radiation is this?
How many grams of magnesium oxide forms when 8.0g of magnesium are burned?
When 8.0 grams of magnesium are burned, approximately 13.26 grams of magnesium oxide are formed following the chemical reaction 2Mg(s) + O2(g) → 2MgO(s). This calculation is based on finding the equivalent moles of magnesium and magnesium oxide using their respective molar masses.
Explanation:The question involves a chemical reaction where magnesium (Mg) is burned or reacts with oxygen to form magnesium oxide (MgO). The balanced chemical equation for this reaction is 2Mg(s) + O2(g) → 2MgO(s).
We first need the molar mass of magnesium (Mg) and magnesium oxide (MgO) to perform these calculations. The atomic mass of magnesium is 24.305 g/mol and for oxygen it's 16 g/mol. Therefore, the molar mass of magnesium oxide (MgO) is 40.305 g/mol (24.305 g/mol for Mg + 16 g/mol for O).
Next, we are given 8.0 grams of magnesium (Mg). Using its molar mass, we find this is roughly 0.329 moles of Mg (8.0g ÷ 24.305g/mol).
According to the balanced chemical equation, the stoichiometric ratio between Mg and MgO is 1:1. Therefore, 0.329 moles of Mg would react to form 0.329 moles of MgO. Converting this to grams using the molar mass of MgO (40.305 g/mol), we find that about 13.26 grams (0.329 mol × 40.305 g/mol) of magnesium oxide are formed when 8.0 grams of magnesium are burned.
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Final answer:
To determine how many grams of magnesium oxide are produced when 8.0g of magnesium are burned, the stoichiometry of the reaction between magnesium and oxygen to form magnesium oxide is analyzed. Using molar masses and the balanced chemical equation, approximately 13.26g of magnesium oxide is calculated to be produced.
Explanation:
The question concerns the chemical reaction between magnesium and oxygen to form magnesium oxide (MgO). This reaction is a classic example of a synthesis reaction where two elements combine to form a compound. In a balanced chemical equation, magnesium (Mg) reacts with oxygen (O2) to produce magnesium oxide (MgO). The balanced equation for this reaction is: 2Mg + O2 → 2MgO.
To determine how many grams of magnesium oxide forms when 8.0g of magnesium are burned, we must first understand the stoichiometry of the reaction. Since one mole of magnesium reacts with half a mole of oxygen to produce one mole of magnesium oxide, the mass of magnesium oxide produced can be calculated using molar masses and stoichiometric ratios. Given that the molar mass of magnesium is approximately 24.305 g/mol and that of magnesium oxide is approximately 40.30 g/mol, the calculation involves converting grams of magnesium to moles, then using the stoichiometric ratios from the balanced equation to find the moles of magnesium oxide produced, and finally converting this amount back to grams.
Given 8.0g of Mg, the moles of Mg can be calculated as 8.0g / 24.305 g/mol = 0.329 moles. From the balanced equation, it is clear that the moles of MgO produced would be the same (because the ratio of Mg to MgO in the reaction is 1:1), therefore, 0.329 moles of MgO. The mass of MgO produced can then be calculated as 0.329 moles × 40.30 g/mol = approximately 13.26g.
The atomic mass of gold (au) is 198, and the atomic number of gold is 79. how many neutrons does a neutral atom of gold contain?
The larger oxygen atom, with more protons, is more ____________ than the hydrogen atom and attracts the electron pair closer.
the covalent compound formaldehyde forms when one carbon atom, two hydrogen atoms, and one oxygen atom bond. write a chemical formula for formaldehyde
what is the source for the ultraviolet radiation in earths
atmosphere