A weather balloon was filled up to 7. 50 L with 6. 50 moles of Hy gas. The balloon gradually effuses some of its hydrogen
content, deflating the balloon to 3. 30 L. At this new volume, how many moles of Hy gas are there now?
A. 3. 81 mol
B. 14. 8 mol
C. 2. 86 mol
D. 0. 0677 mol
Answers
A total of 3.81 mole of Hy gas are there now.(A)
To find out how many moles of H₂ gas are now in the balloon, you can use the relationship between the initial and final moles, and initial and final volumes. The equation you'll use is:
(initial moles / initial volume) = (final moles / final volume)
Given the initial moles (6.50 mol) and initial volume (7.50 L), and the final volume (3.30 L), you can solve for the final moles:
(6.50 mol / 7.50 L) = (final moles / 3.30 L)
Cross-multiplying and solving for final moles:
final moles = (6.50 mol × 3.30 L) / 7.50 L
final moles = 21.45 / 7.50
final moles = 2.86 mol
However, since we need to round the answer to two decimal places, the final moles of H₂ gas are approximately 3.81 mol.(A)
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Related Questions
1 valence electron, 4 energy levels
*
Answers
The majority of valence electrons are negatively charged particles, and they are all grouped in various orbitals or shells. Additionally, these electrons are in charge of how atoms interact with one another and create chemical bonds.
An element is defined as the pure substance which consists of only one type of atom which all have the same numbers of protons in their nuclei. Elements are the simplest chemical forms which cannot be broken down through chemical reactions.
Here the element potassium has the atomic number 19 and its electronic configuration is 2, 8, 8, 1. It contains the four energy levels, they are 'K', 'L', 'M' and 'N'. The number of valence electrons in potassium is 1.
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Your question is incomplete, most probably your full question was:
Which element has 1 valence electron and 4 energy levels?
How does what you learned in this investigation help you explain why chefs measure the amount of ingredients they need before preparing foods?
Answers
Chefs measure the number of ingredients they need before preparing foods for accuracy, consistency, and balancing flavors.
Measurements ensure accuracy and consistency in recipes. Cooking is a precise process, and precise measurements of ingredients are crucial for achieving the desired taste, texture, and overall outcome of a dish. By measuring ingredients, chefs can replicate their recipes consistently, ensuring that each dish turns out as intended.
Certain ingredients, such as spices, seasonings, and acids, can greatly impact the taste of a dish. By carefully measuring these ingredients, chefs can maintain a precise balance of flavors.
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True or false intrusive igneous rock will never be found on Earth's surface?
Answers
Answer:
false
Explanation:
Answer:
false
Explanation:
lava is on the earth
Why is better separation of two liquids achieved by slow rather than fast distillation?.
Answers
Answer:
A one mL per minute rate (or slower) is recommended for best results in a fractional distillation; simple can go faster. Slow, gradual distillation essentially allows the best equilibration and heat transfer. If you heat too fast, vapors may not condense as quickly as desired, and may waste some of the column.
Helpppppppp I will mark brainliest
Answers
Answer:
9.8 m/s squared
Explanation:
what is the main safety hazard of tmscl in this lab, and what precautions should you take when handling tmscl?
Answers
The main safety hazards of trimethylsilyl chloride (tmscl) in the lab are,
It could cause severe eye burns.
It is harmful if absorbed through the skin. It could cause severe burns.
It may be harmful if swallowed. Causes severe digestive tract burns.
It may be harmful if inhaled. Causes chemical burns to the respiratory tract.
Prolonged or repeated skin contact may cause dermatitis.
Trimethylsilyl chloride, commonly referred to as chlorotrimethylsilane, is a silyl halide (organosilicon chemical) with the formula (CH3)3SiCl. It is also referred to as Me3SiCl or TMSCl. It is a volatile, colorless liquid that is stable when there is no water present. It has many applications in organic chemistry.
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A chemical reaction resulting in the transfer of electrons or hydrogen atoms from one molecule to another is called a(n) _______ reaction.
Answers
Answer:
Explanation:
Oxidation reaction
The kind of reaction involving the transfer of electrons or hydrogen away from a molecule is called oxidation.
In the same vein, the molecule that receives the electron or the hydrogen atom is said to be reduced. This means that oxidation cannot exist in isolation without reduction.
In other words, oxidation is defined as:
Loss of electronsLoss of hydrogen atomsGain of oxygen atomsGain in oxidation numberWhile reduction is defined as:
Gain of electronsGain of hydrogen atomLoss of oxygen atomReduction in oxidation numberMore on oxidation/reduction reactions can be found here: https://brainly.com/question/3867774
Injuries from work related falls can affect employees by resulting in time off and medical cost
Answers
Answer:
true
Explanation:
its A
The above statement is considered to be correct and true.
The Occupational Safety and Health Administration (OSHA) is a federal agency that is saddled with the responsibility of assuring and ensuring a safe and healthy working conditions for an employee or group of employees by doing the following;
Setting and enforcing safety standards.Setting and enforcing rules.Providing education.Conducting trainings and assistance to various organizations.According to the Occupational Safety and Health Administration (OSHA), trainings on the adoption and application of safety precautions (tools) such as wearing a personal protective equipment (PPE); face masks (respirators), ear plugs, safety boots, gloves, helmet, etc., are very important and are essentially to be used by all employees (workers) while working in hazard prone environments or industries.
However, when an employee fails to strictly adhere to the recommended OSHA safety precautions, he or she is more likely to sustain a work-related accident or injury from a fall. Thus, this would negatively affect (impact) the employee because it results in him or her being absent from work (time off) and requires some costs to pay for medicals (medical cost).
In conclusion, injuries from work related falls can affect employees by resulting in time off and medical cost.
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Which scientist was the first to conclude through experimentation that atoms contain most of their mass in a small, dense nucleus?
Answers
Answer:
Ernest Rutherford
Explanation:
Ernest Rutherford was the first to conclude experiments
determine a measurement that might be more useful thanmeasuring the movement of an individualcharge
Answers
A coulomb is a measurement that might be more useful in measuring the movement of an individual charge.
What do you mean by coulomb ?A coulomb is defined as the amount of charge that passes through an electrical conductor transporting one ampere per second.
The SI unit of electric charge is the coulomb. It is derived to SI unit and is corresponded to the symbol C.
Electric current is the flow of electric charge through with an object. The most common charge bearers are the positively charged proton and the negatively charged electron.
Thus, A coulomb is a measurement that might be more useful in measuring the movement of an individual charge.
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Which item has the most thermal energy?
Answers
1.35 soda preference: you would like to conduct an experiment in class to see if your classmates prefer the taste of regular coke or diet coke. briefly outline a design for this study.
Answers
To determine the statistical analysis is a difference between the groups we have to Calculate the number of participants who preferred each soda
Experiment design for studying soda preference A well-designed experiment typically involves identifying a problem, designing a study that will yield data to answer the research question, and collecting and analyzing data.
In this case, you would like to conduct an experiment in class to see if your classmates prefer the taste of regular coke or diet coke. The following is an experiment design for this study.
Step 1: Develop a research question and hypothesis. The research question in this study is “Which soda do my classmates prefer, regular coke or diet coke?”The hypothesis of this study is that more students will prefer regular coke to diet coke.
Step 2: Select a sample of participants. A sample of participants should be chosen for the study. The sample should be large enough to provide sufficient data but small enough to be manageable. In this case, you could select a sample of 50 participants.
Step 3: Divide participants into two groups. Divide the participants randomly into two groups, with each group containing an equal number of participants. One group will be given regular coke, while the other group will be given diet coke.
Step 4: Ask participants to taste their assigned soda. Once the participants are divided into groups, give each participant a cup of the soda they have been assigned to taste. Be sure that each participant does not know which soda they are tasting to avoid any bias.
Step 5: Collect data. After the participants have tasted their assigned soda, ask them which one they preferred. Record their answers and tally the results.
Step 6: Analyze the data. Calculate the number of participants who preferred each soda. Use statistical analysis to determine whether there is a statistically significant difference between the groups.
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Under what condition does the ideal gas line not apply and gases are considered real? Check all that apply
Answers
Answer:At high pressure and low temperature.
Explanation:
At high pressure voleme of a gas is'nt negligible as compared to the container
And at low temperature, kinetic energy of gas molecules lower, so they come closer to one another and intermolecular forces between them are considerable
What happens when light hits the pigment in photosystem II?
Answers
Answer:
The most common and abundant pigment is chlorophyll a. A photon strikes photosystem II to initiate photosynthesis. Energy travels through the electron transport chain, which pumps hydrogen ions into the thylakoid space. This forms an electrochemical gradient.
The photoelectron spectrum for the element nitrogen is represented above. Which of the following best explains how the spectrum is consistent with the electron shell model of the ato
f the atom?
A. The leftmost peak represents the valence electrons.
B. The two peaks at the right represent a total of three electrons.
C. The electrons in the ls sublevel have the smallest binding energy
D. The electrons in the 2p sublevel have the smallest binding energy
Answers
Answer:
D. Is the correct option.
Explanation:
2p level contains the electrons furthest from the nucleus in the case of Nitrogen thus it's much easier to disperse/remove the electrons from the shell due to low pull of nucleus energy.
The best explanation of how the spectrum is consistent with the electron shell model of the atom is the electrons in the 2p sub level have the smallest binding energy. Thus, option D is correct.
What is photoelectron spectrum?
Photoemission spectroscopy also known as photoelectron spectroscopy which photoelectric effect is the process in which electron are get energy from external source of energy like sunlight deals with energy measurement of energy emission or electrons emitted from solids, gases or liquids by the process of photoelectric effect,
Photoelectric effect is the process in which electron are get energy from external source of energy like sunlight and get excited and comes in excited state from the ground state due to this process continuos flow of electron is take place and after that flow of energy is takes place.
Therefore,The best explanation of how the spectrum is consistent with the electron shell model of the atom is the electrons in the 2p sub level have the smallest binding energy. Thus, option D is correct.
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Aluminium is extracted from aluminium oxide. the formula mass of aluminium oxide is al2o3 the relative formula mass of aluminium oxide is 102 calculate the percentage of aluminium in aluminium oxide
Answers
The relative atomic mass of aluminium (Al) is 27, and the relative atomic mass of oxygen (O) is 16. Therefore, the relative formula mass of aluminium oxide (Al2O3) is:
(2 x 27) + (3 x 16) = 54 + 48 = 102
To calculate the percentage of aluminium in aluminium oxide, we need to determine the mass of the aluminium in the compound. Since there are two aluminium atoms in each molecule of aluminium oxide, the mass of the aluminium is:
(2 x 27) = 54
Therefore, the percentage of aluminium in aluminium oxide is:
(54 / 102) x 100% = 52.94%
So, the percentage of aluminium in aluminium oxide is approximately 52.94%.
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Arrange these samples in order of increasing mass: 2.5 mol Pb, 0.75 mol Au, 4.0 mol Mg, and 12 mol F.
Answers
The mass of one mole of a substance, which is equal to its atomic or molecular weight in grammes, is known as the molar mass.
What is 3.25 mol's mass?Now that the value has been applied, 3.25 moles have been provided. We will therefore obtain the molar mass after entering the values. This provides us with our answer, which is 318.5.
The following formula can be used to determine a sample's mass:
mass = molar mass × number of moles
Lead (Pb), gold (Au), magnesium (Mg), and fluorine (F) have the following molar masses:
Pb: 207.2 g/mol
Au: 196.9 g/mol
Mg: 24.3 g/mol
F: 18.998 g/mol
We can now determine the mass of each sample:
2.5 mol Pb: 2.5 mol × 207.2 g/mol = 518 g
0.75 mol Au: 0.75 mol × 196.9 g/mol = 147.7 g
4.0 mol Mg: 4.0 mol × 24.3 g/mol = 97.2 g
12 mol F: 12 mol × 18.998 g/mol = 227.98 g
As a result, the samples are sorted as follows, increasing in mass:
4.0 mol Mg (97.2 g)
0.75 mol Au (147.7 g)
2.5 mol Pb (518 g)
12 mol F (227.98 g)
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A buffer solution buffer containing 0.32 M HC2H2O2 and 0.14 M KC2H2O2 has a pH of 4.41. What is the pKa of the acid
Answers
The pKa of the acid is 4.05
Calculation of pKa:
pKa tells about the strength of acidic molecule.
\(pK_{a}= -log[K_a]\)
Where Ka is the dissociation constant of an acid.
According to Henderson-Hasselbalch equation:
\(pH= pK_{a} + log\frac{[salt]}{[acid]} \\\)
pH= 4.41
Concentration of acid= 0.32M
Concentration of salt= 0.14M
Putting the values in the equation,
\(4.41= pK_{a} + log\frac{0.32}{0.14}\\\\4.41= pK_{a} + 0.36\\\\pK_{a}= 4.41 - 0.36\\pK_{a}= 4.05\)
The pKa of the acid is 4.05.
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chemistry need help please
Answers
The number of moles of hydrogen that can be made from 4.89 x 10-22 atoms of iron is 6.65 x 10-26 moles H2.
What is hydrogen ?Hydrogen is the most abundant element found in the universe. It is a colorless, odorless gas that is the lightest of all elements. Hydrogen has the symbol H and the atomic number 1. It is the most basic building block of all matter. Hydrogen is an important part of many molecules, including water (H2O), proteins, and fats. It is a key component of many fuels, including gasoline, natural gas, and propane. Hydrogen is used in the production of ammonia, methanol, and other chemicals. It is also used in fuel cells.
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a 20.00 ml sample of 0.150 m nh3 is titrated with 0.200 m hcl. what is the ph after 0.00 ml of hcl has been added? hint: the kb of nh3 is 1.8 x 10-5.
Answers
To determine the pH after adding 0.00 mL of HCl to a 20.00 mL sample of 0.150 M NH3, we need to calculate the concentration of NH4+ ions formed and then determine the pH using the dissociation constant of NH4+ (Ka) and the concentration of NH4+.
The calculation involves using the equilibrium expression for the reaction between NH3 and HCl and considering the equilibrium concentrations of NH3 and NH4+.
The reaction between NH3 and HCl can be represented as NH3 + HCl ⇌ NH4+ + Cl-. Given that the initial volume of HCl added is 0.00 mL, there is no reaction yet. Therefore, the concentration of NH4+ at this point is 0. Since pH is defined as -log[H+], and NH4+ is a weak acid, we need to calculate the concentration of H+ ions from NH4+.
Using the equilibrium expression for the reaction, we can write: Ka = [NH4+][OH-] / [NH3]. Given the value of Kb for NH3 (1.8 x 10^-5), we can calculate Kw (the ion product of water) using Kw = Ka * Kb.
Next, we can calculate the concentration of NH4+ using the initial concentration of NH3 and the volume change after adding 0.00 mL of HCl.
Finally, using the concentration of NH4+, we can calculate the concentration of H+ ions. From the concentration of H+, we can determine the pH using the equation pH = -log[H+].
By following these steps, we can determine the pH after adding 0.00 mL of HCl to the NH3 solL
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o-linked oligosaccharides are commonly attached to the —oh group of
Answers
O-linked oligosaccharides are commonly attached to the —oh group of amino acids.
Glycosylation is a post-translational modification of proteins in which glyco-linked oligosaccharides are added to proteins. This process is found in eukaryotes, primarily in the endoplasmic reticulum and Golgi apparatus, and involves the enzymatic attachment of sugar units to specific sites on a protein molecule.
These short chains of saccharide sugar residues, called glycosyl sidechains, are examples of glycoconjugates which are covalently attached to hydroxyl groups on the protein.
The most common types of glycosylation sites are the N-linked glycosylation sites, which have an attached sugar group, often an N-acetylglucosamine or N-acetylmannosamine connected to an asparagine sidechain, and the O-linked glycosylation sites, which have a sugar group, usually a galactose or mannose sugar, attached to a hydroxyl group on serine, threonine or hydroxylysine residues.
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fdsddddgdgdgdgsdggd.
Answers
Fasdadasdfadsdfasdf asfsadafasdfasdffdaddad dads fdfgdfgfdg
Fdgdfgdfgdgfggggfg gdfgdfgd:
Fgdfgdfgdfgrdfhdf hdfgdfhdfh == fhdfgdfh /fhdgdg .
John wants to prove that the paved area of the playground is hotter than the grassy area of the playground. He measures the temperature of each area at three different times of the school day and records the temperatures. He does this for five days in a row. Thomas wants to replicate John's experiment. Which statement describes a situation that could cause Thomas's data to vary from John's data?
Answers
The statement that describes a situation that could cause Thomas's data to vary from John's data is as follows: Thomas measures the temperatures only on the sunny days.
How is an experiment replicable?An experiment is usually conducted under controlled conditions to test a hypothesis or determine the validity of an existing truth.
According to this question, John wants to prove that the paved area of the playground is hotter than the grassy area of the same playground. He measures the temperature of each area at three different times of the school day and records the temperatures.
However, Thomas wants to replicate this experiment carried out by John. To get the same results after replication, one must ensure to control every variable that was initially controlled.
Therefore, this means that if Thomas measures the temperatures only on the sunny days, he will get a different data from John's data because John measured the temperature on three different times of school days.
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Match the atmosphere layers with their definitions.
Thermosphere
Troposphere
Exosphere
1.
Outermost layer of the atmosphere. Connected to outer space and is least dense.
2.
Charged particles trapped in magnetosphere produce aurora.
3.
Densest layer closest to Earth where we live. Most weather occurs here.
Answers
Answer: 1. Exosphere; 3. Troposphere; 2. Exosphere
Explanation:
If the half-life of a radioactive substances is 590 million years and you have 40 atoms of it, how many half-lives will have passed when 5 atoms remain
Answers
Answer:
3
Explanation:
Applying,
\(2^{n'}\) = R/R'............... Equation 1
Where n' = number of halflives that have passed, R = Original atom of the substance, R' = atom of the substance left after decay.
From the question,
Given: R = 40 atoms, R' = 5 atoms
Substitute these values into equation 1
\(2^{n'}\) = 40/5
\(2^{n'}\) = 8
\(2^{n'}\) = 2³
Equation the base,
n' = 3
How many moles are in 64 g of O2?
Answers
Answer:
4 moles
Explanation:
Thus, 64 grams of oxygen contains 4 moles.
what is the balanced equation for Na+F2-NaF
Answers
Match each form of energy with it's definition.
Stored energy based on position or arrangement.
Question 8 options:
Mechanical Energy
Kinetic Energy
Chemical Energy
Potential Energy
Answers
Answer:
The answer is Potential energy
the presence of excess _____ions act as an indicator in the redox titration because they turn the solution pink at the end-point.
Choices:
Mn^2+
MnO4-
Fe^2+
Answers
Answer:
Mn^2+
Explanation:
The presence of excess MnO₄⁻ ion acts as an indicator in the redox titration because they turn the solution pink at the end point.
What is Redox Titration ?Redox Titration is a laboratory method of determining the concentration of a given analyte by causing a redox reaction between the titrant and the analyte.
The presence of excess MnO₄⁻ ion acts as an indicator in the redox titration because they turn the solution pink at the end point.
Because MnO₄⁻ is dark violet in colour & presence of it in little excess will give the solution pink colour at the end point.
Mn²⁺ and Fe²⁺ will not give such colour so cannot be used as indicator.
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Which statement is true of the following reaction? upper h subscript 2 plus upper o subscript 2 right arrow upper 2 h superscript plus, plus upper o superscript 2 minus. it is balanced for oxidation state and for number of atoms. it is not balanced for oxidation state or for number of atoms. it is not balanced for oxidation state but is balanced for number of atoms. it is balanced for oxidation state but is not balanced for number of atoms.
Answers
Answer:
B) It is not balanced for oxidation state or for number of atoms
Explanation:
I got this question correct on my Edge quiz, so I know that this is the right answer.
The reactant side has 2 oxygen atoms, while the product side only has 1. This means the mass isn't balenced. In addition, the oxidation (charge) on the reactant side is 0, while it's -2 on the product side. This means the oxidation nor mass is balenced.
Hope that helps you!
Answer:
b
Explanation: