Answer:
The amount of substance we need to recover 34.6 mol of carbon is 465.47g
Explanation:
we want to know what mass of substance we need to recover 34.6 mol of carbon
This substance is composed of 89.2% carbon
Wmust recover 34.6 mol of carbon and we know that the molecular mass of carbon is 12g / mol this means that one mole of carbon has a mass of 12 g
We use a simple rule of three to know how many grams of carbon are in 34.6 mol
[tex]1 mol C\longrightarrow 12g\\34.6 mol C\longrightarrow x\\x=\frac{(34.6)(12)}{1}= 415.2 g[/tex]
415.2 g are 34.6 mol of carbon
As the amount of carbon we want to recover is 415.2g (34.6mol) and this amount corresponds to 89.2% of the total
To calculate the total mass we need we use a simple rule of three
[tex]89.2\%\longrightarrow 415.2 g\\100\%\longrightarrow x\\x=\frac{(100)(415.2)}{89.2}\\ x= 465.4g[/tex]
The amount of substance we need to recover 34.6 mol of carbon is 465.47g
What is the pH of blood, given the hydrogen ion concentration is 4.0 × 10-8M?
The pH of blood with a hydrogen ion concentration of 4.0 × 10⁻⁸ M, we use the formula pH = -log[H+]. This results in a pH of approximately 7.4, indicating that blood is slightly alkaline.
The pH of blood given the hydrogen ion concentration, use the formula: pH = -log[H+]
Given: [H+] = 4.0 × 10⁻⁸ M
Step-by-step calculation:
First, find the log of 4.0 × 10⁻⁸log(4.0 × 10-8) = log(4.0) + log(10⁻⁸)log(4.0) ≈ 0.6021log(10-8) = -8Therefore, log(4.0 × 10⁻⁸) ≈ 0.6021 - 8 = -7.3979So, the pH = -(-7.3979) = 7.3979
Conclusion: The pH of blood is approximately 7.4, which is slightly alkaline.
When 7.94 g of xylene was added to 132.5 g of cyclohexane, the freezing point of the solution was -4.9oC. What is the molar mass of xylene?
Olympic athletes have lower resting heart rates because
What is the energy of an object in motion
It's kinetic energy :)
HELP. Check all answers that apply.
Copper oxide is a(n):
atom.
molecule.
subatomic particle.
element.
compound.
If the strength of the magnetic field at B is 6 units, the strength of the magnetic field at A is _____.
file:///C:/AOP/SH2016Curric/AOP.COM.Science.09IPC.2015/IntegratedPhysicsandChemistry2015/9/magnetic_field_ex1.gif
The magnetic field strength at point A cannot be determined based solely on the strength at point B being 6 units. Factors such as distance from the magnet, the presence of ferromagnetic materials, and orientation relative to the magnetic lines of force could affect its strength.
Explanation:Unfortunately, there is missing information in your question. The strength of the magnetic field at point A cannot be determined, just with the strength at point B being 6 units. The magnetic field strength can vary depending on factors like the distance from the magnet, if any ferromagnetic materials are near, and the orientation relative to the magnetic lines of force. Without additional context or information, it's impossible to infer the magnetic field strength at point A accurately.
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In a reaction, a gas being produced is
An explanation based on experimentation and data is a scientific
Which of the following applies to a good hypothesis?
Select all that apply
- It explains the data that relates to the specific problem.
- It leads to correct predictions, some of which produce new evidence or experiments.
- It is biased by the experimenter's presuppositions.
- It is formulated based on subjective observations.
- It is formulated based on objective observations
The statements that applies to a good hypothesis are.
It explains the data that relates to the specific problem.It leads to correct predictions, some of which produce new evidence or experiments. It is formulated based on objective observationsGood hypothesis explained.
A good hypothesis ought to give an clarification for the information related to the issue being examined. It ought to too lead to forecasts that can be tried and possibly create modern prove or tests.
A good hypothesis ought to be defined based on objective perceptions, meaning it ought to be grounded in irrefutable and quantifiable information instead of subjective conclusions or inclinations.
It is worth noticing that a hypothesis can be impacted by earlier
information or foundation presumptions, but it ought to still be based on objective perceptions and open to experimental testing and confirmation.
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Which of these choices is an indirect cost of using coal?
A. Cost to transport coal
B. Cost of maintaining power plants
C. Cost to mine coal
D. Cost of pollution from burning coal
Answer:
D. Cost of pollution from burning coal
Explanation:
Energy resources can be classified into two categories: renewable and non-renewable.
Renewable resources are those that can be replenished within a short time. This includes, wind energy, solar, hydrothermal etc
Non-renewable resources in contrast, are finite and are in limited supply. This includes, fossil fuels like coal, oil and natural gas as well as nuclear energy.
Coal is a fossil fuel which also the most common source of energy. However, it pollutes the environment by emitting carbon dioxide which is greenhouse gas.
In an ecosystem ,cost of pollution from burning coal is an indirect cost of using coal.
What is an ecosystem?Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
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51.7ml at 27 Celsius and 90kpa to stp
How many nad+ are reduced in the β-oxidation of stearoyl-coa to form nine molecules of acetyl-coa?
Determine the percent yield for the reaction between 3.74 g of na and excess o2 if 5.34 g of na2o2 is recovered.
The percentage yield for the reaction is 84.2%.
What is percent yield?Percent yield is the difference in the percent of theoretical yield to the percent of actual yield.
The reaction is
[tex]\rm2Na + O_2 = Na_2O_2[/tex]
Mass of Na = 3.74g
Calculating the moles of Na
[tex]\rm Number\;of \;moles= \dfrac{mass}{molar\;mass}\\\\\\Number\;of \;moles= \dfrac{3.74}{23}= 0.162 \;mol[/tex]
The ratio of mole of Na : (Na₂O₂) = 2:1
[tex]\rm Number\;of \;moles= \dfrac{0.162}{2}= 0.081 \;mol\\\\mass\;of Na_2O_3 = 0.081 \times 78\;g/mol\\\\mass\;of Na_2O_3 = 6.341\;g\\\\\\Yield \;of\;reaction = \dfrac{5.34g}{6.341g} \times 100 = 84.2\%[/tex]
Thus, the percent yield is 84.2%.
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Three different sub-atomic particles are described below:
Particle X: Uncharged
Particle Y: Present outside the nucleus
Particle Z: Attracts Particle Y
Which statement is true?
X is a neutron, Y is an electron, and Z is a proton.
X is a neutron, Y is a proton, and Z is an electron.
X is a proton, Y is an electron, and Z is a neutron.
X is an electron, Y is a proton, and Z is a neutron.
Answer:
The first answer
Explanation:
Why? Because i got it right on my test.
I didn't copy of the other persons answer.
The number of protons is different for each element and is know as the
Will maynez burns a 0.8-g peanut beneath 76 g of water, which increases in temperature from 22âc to 46 âc. (the specific heat capacity of water is 1.0 cal/(gââc).)
When a neat, ordered chemical is changed into a more disordered chemical, there is an increase in what?
A sample of ammonia contains 0.500 mol. What volume at STP would the gas occupy?
what is part of the first stage in the process of technological design
Answer:
Researching information
Explanation: Edge 2020
hope this helps <3. Brainliest?
Identifying the problem is the first stage in the process of technological design.
What do you mean by technological design?Technological design is a distinctive process with a number of defining characteristics: It is purposeful; it is based on certain requirements; it is iterative; it is creative; and it is systematic.
The four steps in the technological design process are:
Identify the problem Design a solution or product Implement the design Evaluate the product/solution.Hence, identifying the problem is the first stage in the process of technological design.
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What is the atomic nucleus made of ?
only neutrons
electrons
only protons
nucleons
The atomic nucleus is made of Nucleons
which of the following groups contain 3 elements with stable electron configuration
a. xenon, neon, boron
b. calcium, krypton, argon c. helium, xenon, carbon d. argon, neon, xenon
Option d, which includes argon, neon, and xenon, contains three elements with stable electron configurations as they are all noble gases with full valence shells.
The student's question pertains to the electron configuration of elements, specifically identifying a group of elements that all have stable electron configurations. A stable electron configuration typically means having a full valence shell of electrons, which is characteristic of the noble gases. Noble gases include helium, neon, argon, krypton, xenon, and radon, and they are known for being chemically inert, or nonreactive, due to their complete electron shells. The correct answer to the question is option d. argon, neon, xenon, as all three of these elements are noble gases and therefore have a stable electron configuration.
Identify which statement describes the following process. 2Ce + 3Cu2+ → 3Cu + 2Ce3+
A-Ce is oxidized because it is losing electrons and Cu is reduced because it is gaining electrons.
B-Ce is oxidized because it is losing electrons and Cu is reduced because it is losing electrons.
C-Ce is reduced because it is losing electrons and Cu is oxidized because it is gaining electrons.
D-Ce is reduced because it is gaining electrons and Cu is oxidized because it is losing electrons.
The correct statement describing the process is A. Ce is oxidized because it is losing electrons and Cu is reduced because it is gaining electrons.
To understand the oxidation and reduction processes in the given chemical reaction, we need to look at the changes in the oxidation states of the elements involved:
The reaction is:
[tex]\[ 2\text{Ce} + 3\text{Cu}^{2+} \rightarrow 3\text{Cu} + 2\text{Ce}^{3+} \][/tex]
For cerium (Ce), it starts with an oxidation state of 0 (since it is an elemental form) and ends up as Ce³⁺ , which means its oxidation state has increased from 0 to +3. An increase in oxidation state indicates that the element has lost electrons, which is the definition of oxidation. Therefore, Ce is oxidized. For copper (Cu), it starts with an oxidation state of +2 (since it is in the form of Cu²⁺ ions) and ends up as elemental copper with an oxidation state of 0. A decrease in oxidation state indicates that the element has gained electrons, which is the definition of reduction. Therefore, Cu is reduced. The correct description of the process is that Ce is oxidized because it loses electrons, and Cu is reduced because it gains electrons, which corresponds to option A. The other options contain incorrect descriptions of the oxidation and reduction processes for Ce and Cu.What is the ph of a 0.01 m solution of the strong acid hno3 in water?
The pH of a 0.01 M solution of the strong acid [tex]HNO\(_3\)[/tex] in water is 2.
To determine the pH of a strong acid solution, we can use the fact that strong acids completely dissociate in water. This means that for a 0.01 M solution of [tex]HNO\(_3\)[/tex], all of the [tex]HNO\(_3\)[/tex] molecules dissociate into H⁺ ions and [tex]NO\(_3\)\(^-\)[/tex] ions. Therefore, the concentration of H⁺ ions in the solution is equal to the concentration of the [tex]HNO\(_3\)[/tex] solution, which is 0.01 M.
The pH of a solution is defined as the negative logarithm (base 10) of the hydrogen ion concentration [H⁺]:
[tex]\[ \text{pH} = -\log_{10} [\text{H}^+] \][/tex]
Substituting the concentration of H⁺ ions into the equation gives:
[tex]\[ \text{pH} = -\log_{10} (0.01) \] \[ \text{pH} = -\log_{10} (10^{-2}) \] \[ \text{pH} = -(-2) \] \[ \text{pH} = 2 \][/tex]
Thus, the pH of a 0.01 M [tex]HNO\(_3\)[/tex] solution is 2.
The vapor pressure of water at 25.0 oc is 23.8 torr. determine the mass of glucose (molar mass = 180. g/mol) needed to add to 27.78 moles of water to make a solution that has a vapor pressure of 23.1 torr.
Molecules of hydrogen escape from earth, but molecules of oxygen and nitrogen are held to the surface and remain in the atmosphere. explain.
Answer:
Hydrogen is a light molecule
Explanation:
The molecular weight of a gas determines its molecular speed. Hydrogen is a very light gas, far lighter than oxygen or nitrogen. These heavier gases cannot escape the earth because of their molecular weight but hydrogen does escape the earth surface because it is very light molecule having very high molecular speed.
Does the nature of intermolecular forces change when a substance goes from a solid to a liquid or from liquid to gas?
Why will oil and water never mix second law of thermodynamics?
What is the mass of 1.71 ✕ 1023 molecules of h2so4?
Marine organisms that are well adapted to drastic changes in salinity would most likely be found in which environment?
a. Hydrothermal vent
b. Estuary
c. Open ocean
d. Deep ocean
K12 the answer is estuary
Hope this helps!
Of the choices below which one is not an ionic compound quizlwr
NC13 is a compound that is not an ionic compound.
Explanation:Of the compounds listed, the only one that is not an ionic compound is NC13. Ionic compounds are formed between a metal and a nonmetal, where electrons are transferred from the metal atom to the nonmetal atom. Covalent compounds, on the other hand, are formed between nonmetals, where electrons are shared between atoms. In this case, NC13 is covalent because it is composed of nitrogen (a nonmetal) and chlorine (also a nonmetal).