56.2 ml of ethanol was dissolved in 123.6 ml of water. what is the proof of the ethanol in the solution?
Answers
The concentration terms are molality, normality and mole fraction and percent by volume. Therefore, the proof of the ethanol in the solution is the percent by volume that is 45.4%.
What is percent by volume?The percent by volume formula calculates the concentration of the solution by using the volume of the solute (the dissolved content in the solvent) and the volume of the solution. It is represented as (v/v%).
Mathematically,
percent by volume=(volume of solute÷ volume of solution)×100
Volume of solute=56.2 ml
volume of solution=123.6 ml
Substituting all the given values in the given formula, we get
percent by volume=(56.2 ÷ 123.6)×100
=45.4%
Therefore, the proof of the ethanol in the solution is the percent by volume that is 45.4%.
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Related Questions
If the solutions of nabr and hg(no3)2 are mixed, how many precipitation reactions will there be?
Answers
If the solutions of NaBr and Hg(NO₃)₂ are mixed, there will be one precipitation reaction.
What is a Precipitation Reaction?When dissolved substances react, one (or more) solid products are created, which is termed a precipitation reaction. These kinds of reactions, which are also occasionally known as double displacement, double replacement, or metathesis reactions, frequently involve the exchange of ions between ionic compounds in aqueous solutions.The development of a solid form residue known as the precipitate occurs during precipitation reactions, which are typically double displacement processes.Additionally, when two or more solutions containing various salts are mixed, these reactions take place, resulting in the creation of insoluble salts that precipitate out of the solution.The precipitation reaction of the given reaction is
NaBr + Hg(NO₃)₂ ⇒ HgBr₂ + NaNO₃.
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What do all cells requiere a constant supply of
Answers
What volume will 25.2 g of He occupy at STP?
Answers
Answer:
The volume is 20.3
Explanation:
for a given amount of a gas at a certain temperature, does the pressure deviate from ideality more in a smaller or larger container? why? the pressure deviates more from ideality in a larger container because the attractive forces between molecules become a greater factor at the lower pressure and the molecular volume is a smaller part of the total volume of the larger container. the pressure deviates more from ideality in a smaller container because the attractive forces between molecules become less of a factor at the higher pressure and the molecular volume is a larger part of the total volume of the smaller container. the pressure deviates more from ideality in a smaller container because the attractive forces between molecules become a greater factor at the higher pressure and the molecular volume is a larger part of the total volume of the smaller container. the pressure deviates more from ideality in a smaller container because the attractive forces between molecules become a greater factor at the higher pressure and the molecular volume is a smaller part of the total volume of the smaller container. the pressure deviates more from ideality in a larger container because the attractive forces between molecules become less of a factor at the lower pressure and the molecular volume is a smaller part of the total volume of the larger container. the pressure deviates more from ideality in a larger container because the attractive forces between molecules become less of a factor at the lower pressure and the molecular volume is a larger part of the total volume of the larger container.
Answers
The pressure will deviates more ideality in case of smaller container as its attract more forces between molecules because of intermolecular and finite volume of gas particle .
Smaller container will have more devotion because on the basis of ideal gas law the gas particles don't posses any volume and there are no intermolecular forces between them. But , the gas particles do have a finite volume and there are intermolecular forces that can affect the behavior of the gas in closed system .
Hence, In a smaller container, the gas particles remains close with each other so their volume becomes a more significant fraction of the total volume of the container. On the other hand, in a larger container, the gas particles are more scattered and lies apart , so their volume becomes a smaller fraction of the total volume of the container.
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Hello! Please Answer this chemistry question!
Are two atoms of the same element identical?
Answers
Yes they are
According to definition of an element
An element is a combination of one kind of many atoms into one place .An element consists of several atoms of one type
So they are identical
Answer:
Although it may seem weird, the answer is actually yes. An element is a pure substance consisting only of atoms that all have the same numbers of protons in their nuclei. This means that all of the atoms are all the same because they contain the same amount of protons.
In conclusion, the atoms that make up an element are identical.
TIME REMAINING
01:50:03
The independent variable is the only factor that a scientist
O varies for different groups in an experiment.
O measures in an experiment
O keeps constant for each group in an experiment.
O records throughout an experiment.
Save and Exit
Next
Submit
Mark this and return
Answers
Answer:
measures in an experiment
The independent variable is also defined as the regressors or controlled variable. It is the variable which is thought to be the cause of some effect. The independent variable is the only factor that a scientist varies for different groups in an experiment. The correct option is A.
An independent variable is defined as the variable which is changed or controlled in a scientific experiment in order to study the effects on the dependent variables. It is known as the quantity which is being manipulated in an experiment.
Thus independent variable is option A.
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O CHEMICAL BONDING = Drawing Lewis structures for simple organic compounds Draw the Lewis structure for iodoethane (C2H,1). Be certain you include any lone pairs. Ć c с IT ?
Answers
The Lewis structure for iodoethane (C2H,1) is as follows.
I - C - C - H
| |
H H
| |
H H
What is a Lewis structure?A Lewis structure, also known as a Lewis dot diagram, is a way to represent the bonding and non-bonding electrons in a molecule. It is named after Gilbert N. Lewis, who introduced it in 1916. A Lewis structure shows the chemical symbol of each atom in the molecule and the electrons that are involved in the chemical bonds. It is used to predict the molecular geometry, reactivity, and other chemical properties of a molecule.
In this structure, the central atom is the carbon atom, and the outer atoms are the hydrogen and iodine atoms. The carbon atoms each have four bonds, which are satisfied by the three hydrogen atoms and the iodine atom. The iodine atom has one lone pair, which is not shown in the structure.
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a ballon with helium gas is initally at pressure 1 atm(101325 Pa) with volume =1 m∧3 and temperature of T=300 K. part a. how many atoms of helium are in the gas? part b. how many moles? part c. what is the total kinetic energy of the gas? part d. if the temperature is increased to T=400k, what is the new volume? part e. if the volume is decreased to V=.2m ∧3 what is the new pressure?
Answers
(a) The number of helium atoms in the gas can be calculated using Avogadro's number and the ideal gas law.
(b) The number of moles of helium can be determined by dividing the number of atoms by Avogadro's number.
(c) The total kinetic energy of the gas can be calculated using the equation for the average kinetic energy of gas particles.
(d) The new volume can be determined using the ideal gas law and the given temperature change.
(e) The new pressure can be calculated using the ideal gas law and the given volume change.
To determine the number of helium atoms in the gas, we can use Avogadro's number (6.022 × 10^23 atoms/mol) and the ideal gas law. Since the gas is initially at 1 atm and 300 K, we can calculate the number of atoms using the formula: (number of atoms) = (pressure) × (volume) / (RT), where R is the ideal gas constant. Substitute the given values and calculate the result.
Once we have the number of atoms, we can find the number of moles by dividing the number of atoms by Avogadro's number. This will give us the quantity of helium in moles.
The total kinetic energy of the gas can be calculated using the equation: (total kinetic energy) = (3/2) × (number of moles) × (R) × (temperature), where R is the ideal gas constant. Substitute the given values and calculate the total kinetic energy.
To determine the new volume when the temperature is increased to 400 K, we can use the ideal gas law. Rearrange the formula PV = nRT to solve for the new volume V. Substitute the given values and calculate the new volume.
When the volume is decreased to 0.2 m³, we can use the ideal gas law again to find the new pressure. Rearrange the formula PV = nRT to solve for the new pressure P. Substitute the given values and calculate the new pressure.
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A student flipped a coin 1000 times and recorded the outcome of each
and every flip. Her data showed 517 Heads and 483 Tails. Knowing the data
should have turned out with the same number of heads as tails, what is
her % error for tails?
17
3.4%
83
-0.034%
None of these
Answers
Answer:
i guess none of these or 3.4% for 10%
Explanation:
I think the answer should be in the 30 to 40 number scale
hellpppp pleaseeee !!! under immense pressure and immense heat the protons at the center will _______ together.
Answers
The process of nuclear fusion will occur.
What will protons at the center do under immense pressure and immense heat ?Under immense pressure and heat, protons at the center of an object can undergo a process called nuclear fusion, where two or more atomic nuclei combine to form a heavier nucleus, releasing a large amount of energy in the process. This is the process that powers stars, including our sun.
In the core of a star, for example, the immense pressure and heat cause hydrogen nuclei (protons) to collide and fuse together to form helium nuclei. This process releases a tremendous amount of energy in the form of light and heat, which ultimately keeps the star shining and stable.
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What happened to the molecule when the electron was promoted to the antibonding orbital?.
Answers
the bond will break
The bond will dissolve (break) if the electron absorbs a photon and is moved from a bonding molecular orbital to an antibonding orbital since there is no longer an overall stabilizing interaction.
What is an antibonding orbital?An antibonding molecular orbital is the molecular orbital created by the destructive overlapping of atomic orbitals.
Why is it called antibonding orbital?Every atom will add one electron to the bond that makes up the lower energy bond. To prevent interacting with the other two electrons, the additional electron will occupy a higher energy state. The antibonding orbital is the name of this higher energy orbital.What orbitals form an antibond?The bonding orbitals are home to electrons that spend the majority of their time between the nuclei of two atoms, whereas the antibonding orbitals are home to electrons that spend the majority of their time outside the nuclei of two atoms.When an electron was elevated to the antibonding orbital, what happened?In contrast, putting electrons in antibonding orbitals will make the molecule less stable. The energy levels of the orbitals will determine how many electrons are filled. The lower energy orbitals will be filled first, and then the higher energy orbitals.To learn more about antibonding orbitals visit:
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The specific heat capacity of solid copper metal is 0. 385 J/g-K. How many joules of heat are needed to raise the temperature of a 2. 12-kg block of copper from 25. 0 °C to 88. 0 °C?
Answers
Answer:
Explanation:
To calculate the amount of heat needed to raise the temperature of the copper block, we can use the formula:
Q = m * c * ΔT
where Q is the amount of heat in joules, m is the mass of the copper block in grams, c is the specific heat capacity of copper in J/g-K, and ΔT is the change in temperature in Kelvin.
First, we need to convert the mass of the copper block from kilograms to grams:
m = 2.12 kg * 1000 g/kg = 2120 g
Next, we need to calculate the change in temperature in Kelvin:
ΔT = (88.0 °C + 273.15 K) - (25.0 °C + 273.15 K) = 336.30 K - 298.15 K = 38.15 K
Now, we can plug in the values into the formula:
Q = m * c * ΔT = 2120 g * 0.385 J/g-K * 38.15 K = 31233.98 J
Therefore, approximately 31,234 joules of heat are needed to raise the temperature of the 2.12-kg block of copper from 25.0 °C to 88.0 °C.
What is the trachea and where does it go?
Answers
Answer:
The trachea is a tube-like structure within the neck and upper chest. It transports air to and from the lungs when a person breathes. When a person inhales, air travels through the nose or mouth, down the trachea, and into the lungs.
Explanation:
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the solution in part b consists of 1.00 g of dissolved sodium hydroxide in 25.0 g of water. if the solution temperature increases from 23.2 °c to 45.3 °c, how much heat is absorbed?
Answers
The amount of heat absorbed when the temperature of the sodium hydroxide solution increases from 23.2 °C to 45.3 °C is 1084.4 J.
To calculate the amount of heat absorbed when the temperature of the sodium hydroxide solution increases from 23.2 °C to 45.3 °C, we can use the formula:
q = m x C x ΔT
where q is the heat absorbed, m is the mass of the solution, C is the specific heat capacity of the solution, and ΔT is the change in temperature.
First, we need to calculate the mass of the solution. The mass of the solution is the sum of the mass of the sodium hydroxide and the mass of water:
mass of solution = mass of NaOH + mass of water
mass of solution = 1.00 g + 25.0 g
mass of solution = 26.0 g
Next, we need to calculate the specific heat capacity of the solution. The specific heat capacity of a solution is the amount of heat required to raise the temperature of one gram of the solution by one degree Celsius. The specific heat capacity of a solution can be estimated as the weighted average of the specific heat capacities of the solute and solvent. The specific heat capacity of water is 4.18 J/g °C, and the specific heat capacity of sodium hydroxide is 1.23 J/g °C. The weight fraction of water in the solution is:
weight fraction of water = mass of water / mass of solutionweight fraction of water = 25.0 g / 26.0 g
weight fraction of water = 0.9615
The weight fraction of sodium hydroxide is therefore:
weight fraction of NaOH = 1 - weight fraction of water
weight fraction of NaOH = 1 - 0.9615
weight fraction of NaOH = 0.0385
Using these weight fractions and specific heat capacities, we can calculate the specific heat capacity of the solution:
C = (0.9615 x 4.18 J/g °C) + (0.0385 x 1.23 J/g °C)
C = 4.08 J/g °C
Finally, we can use the formula to calculate the heat absorbed:
q = m x C x ΔT
q = 26.0 g x 4.08 J/g °C x (45.3 °C - 23.2 °C)
q = 1084.4 J
Therefore, the amount of heat absorbed when the temperature of the sodium hydroxide solution increases from 23.2 °C to 45.3 °C is 1084.4 J.
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where is the chemical energy stored in adenosine triphosphate (atp), as shown below?
Answers
imagine two locations (a and b) for which we only observe zinc concentrations. location a contains 100ppm higher concentration of zinc than location b. how much higher would we expect the lead concentration to be in location a compared to location b?
Answers
With just an averaged concentration of fifty ppm, Zn concentrations of soils range between 10 to 300 ppm on the geochemical composition. Zinc content would've been 100 * 0.289523, and 28.9523 ppm higher.
What do elevated zinc levels indicate?The major causes of elevated zinc levels are lead toxicity and iron insufficiency. Infections, anaemia, and chronic disease sufferers may also have high zinc levels, although these disorders are not often tracked or diagnosed with zinc assays. Interpret your laboratory findings.
What causes wastewater to have a high zinc content?Zinc levels in air, soil, or water have increased as a result of increased demand for zinc around the world over the past few decades, incorrect wastewater discharge from mineral extraction and processing, landfill or dumpsite spills, and the combustion of fossil fuels.
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why is iron widely extracted in the industries
Answers
Answer: it's an integral component of steel
Explanation: it's also an economic essential to US growth and is used for transportation, energy, and construction
Draw the following particle (molecular compound).
SO4^-2
Answers
Counting electrons
When drawing molecules, an important first step is to first count the total valence electrons (electrons in the outer shell) in the molecule. Sulfur has 6 valence electrons, each oxygen has 6 valence electrons, and the 2- charge indicates there are 2 additional electrons. This comes out to be a total of 32 electrons.
Drawing the molecule
The next step is to draw the general shape of the molecule. In this case, sulfur is the central atom and 4 oxygens surround it, so draw a sulfur atom labelled as S with 4 oxygens equally spaced around it.
Next, you want to fill in the bonds between each oxygen to the sulfur atom. This will be a total of 4 bonds.
Now, count the number of electrons used. 4 bonds consisting of 2 shared electrons each is 8 electrons. We have 24 electrons left.
Add these remaining 24 electrons to the surrounding oxygens in pairs of 2, making sure that no atom has more than 8 electrons around it (1 bond and 3 pairs).
This is one possible structure of SO4 2-, but it is not the most common one.
Formal charge of each atom in a molecule is calculated by taking the normal amount of valence electrons, in sulfur for example, 6, and subtracting it by the total amount of non-bonding electrons and the amount of bonds. In this case in the structure we just drew above, the formal charge is 6-4=2, where 4 is the amount of bonds to sulfur.
FC=V−N−B/2
this is the equation for formal charge. V is the valence electrons of the atom in its ground state, or when it is not bonded to anything else. N is the number of non-bonding, or loose, electrons around the atom in the molecule. B is the number of electrons that are in bonds.
All atoms in a molecule want to have a formal charge as close to zero as possible, and this is a rare case where sulfur can be an exception to the octet rule and have more than 8 valence electron in order to satisfy this need.
Therefore, in this case, 2 of the single bonds around sulfur can be replaced by double bonds, so that the formal charge is 6-6=0. So, for two of the oxygens, remove one pair of electrons and turn them into bonds with sulfur.
There are several different places you can add these double bonds, which lead to structures called resonant structures. Resonant structures have the same number of non bonding electrons and bonds, but the single and double bonds are in different places.
The attached image is just one resonant structure, but keep in mind there are other possible very similar structures-- for example, the double bonds could be opposite of each other.
These structures are more common as they have the lowest formal charge on the central atom, sulfur.
If 0.004 moles of oxygen (O2) reacted, how many grams of N2 were needed? (round to the nearest hundredth, type in number and units )
Answers
Approximately 0.06 grams of N2 were needed. This number of entities is approximately 6.022 x 10^23 and is known as Avogadro's number.
What is Moles?
Moles are a unit of measurement used in chemistry to express amounts of a chemical substance. One mole is defined as the amount of a substance that contains as many elementary entities (such as atoms, molecules, ions, or electrons) as there are atoms in 12 grams of pure carbon-12.
The balanced chemical equation for the reaction between oxygen and nitrogen is:
N2 + O2 -> 2NO
From the equation, we see that 1 mole of N2 reacts with 1 mole of O2 to produce 2 moles of NO. Therefore, if 0.004 moles of O2 reacted, then we need half as many moles, or 0.002 moles of N2.
To convert moles of N2 to grams, we need to use the molar mass of N2, which is approximately 28 g/mol. Thus, the mass of 0.002 moles of N2 is:
0.002 moles N2 x 28 g/mol = 0.056 g N2
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The three isotopes of uranium are ^234<92U ^233<92 and ^232<92U how many proton neutron and electron are present in each isotopes
Answers
Answer: protons: 92
electrons: 92
1. neutrons: 234-92 = 142
2. Neutrons- 233-92 = 141
3. Neutrons 232-92= 140
Explanation:
How many grams of rubber stoppers would be needed to contain the same number of stoppers as there are corks in 1.0 kg of corks?
Answers
The weight of each stopper can vary based on the material, size, and manufacturing process used, so it is not possible to determine the number of rubber stoppers needed without more information.
What is weight and average weight?Weight is a measure of the force of gravity on an object and is typically measured in units of Newtons (N), pounds (lb), or kilograms (kg).
Average weight, on the other hand, refers to the sum of the weights of a group of objects divided by the number of objects in the group. It provides an estimate of the typical or central value of the weights in the group. The units of average weight are the same as the units used to measure weight.
The number of rubber stoppers needed to contain the same number of stoppers as there are corks in 1.0 kg of corks would depend on the average weight of each type of stopper.
The weight of each stopper can vary based on the material, size, and manufacturing process used, so it is not possible to determine the number of rubber stoppers needed without more information.
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How many cans are on each palet
Answers
Answer:
1440
Explanation:
32 cans/bundle and there are 45 bundles 32 x 45 = 1440
Silver, Chromium and Copper are these type of elements _____
Answers
Answer:
Group 11
Explanation:
Group 11, by modern IUPAC numbering, is a group of chemical elements in the periodic table, consisting of copper (Cu), silver (Ag), and gold (Au).
Answer:
silver, chromium and copper are metal type of element
Balance the following chemical equation (if necessary):
FeCl3(aq) + Na₂S (aq) → Fe₂S3 (S) + NaCl(aq)
Answers
The correct balanced chemical equation is FeCl₃(aq) + Na₂S(aq) → 3Fe₂S₃(s) + 3NaCl(aq)
To achieve a chemical equation's balance:
Fe₂S₃ (s) + NaCl (aq) FeCl₃ (aq) + Na₂2S (aq)
Let's start by balancing the atoms of iron (Fe). The iron atoms are already balanced, since there are two on the reactant side and two on the product side.
Let's now balance the atoms of sodium (Na). Two sodium atoms are present on the reactant side, hence two sodium atoms are required on the product side. By adding a coefficient of 2 in front of NaCl, we may do this:
Let's balance the sulfur (S) atoms lastly.
FeCl3(aq) + Na2S(aq) → 3Fe2S3(s) + 3NaCl(aq)
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does anyone know how to do this??????
Answers
Answer:
you have to answer about what Emmy Noether was known for and how she accomplished her goal! For example Dr. Martin Luther King was known for his peaceful protests and his famous "I Have a Dream". He accomplished this goal by never giving up and sticking to his morals! I hope this helped!! ♡♡ (BTW love your profile picture)
A lump of zinc is tossed into a beaker of 500L of 14M hydrochloric acid. this reaction produces Hydrogen Gas and zinc (II) chloride. If the hydrogen gas is combusted and produces 645L of water vapor at 400 kelvin and 1.75 atm, what is the mass of the zinc?
Answers
If the hydrogen gas is combusted and produces 645L of water vapor at 400 kelvin and 1.75 atm, 2796.96 g mass of the zinc is produced .
Using the ideal gas law equation:
PV = nRT
n = (PV) / (RT)
= (1.75 atm * 645 L) / (0.0821 atm·L/(mol·K) * 400 K)
= 42.71 moles
the balanced equation for the reaction between zinc and hydrochloric acid:
Zn + 2HCl -> \(ZnCl_{2}\) + \(H_{2}\)
1 mole of zinc produces 1 mole of hydrogen gas. Therefore, the moles of zinc are also 42.71.
The molar mass of zinc is 65.38 g/mol.
Mass of zinc = moles of zinc * molar mass of zinc
= 42.71 moles * 65.38 g/mol
= 2796.96 g
Therefore, the mass of the zinc is 2796.96 grams.
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Using tabulated values from the textbook Resource section or the chemlibre links, calculate the standard reaction entropy of N2(g) + 3 H2(g) → 2 NH3(g). (3 sig figs, units of J/K/mol)
Answers
The standard reaction entropy of N2(g) + 3 H2(g) → 2 NH3(g) is -196.3 J/K·mol.
What do you mean by standard reaction entropy?
Standard reaction entropy (ΔS°) is a measure of the disorder or randomness of a chemical reaction at a constant temperature and pressure. It is defined as the change in the entropy of the system when a reaction occurs under standard conditions. The standard state for a substance is its pure form at a pressure of 1 bar and a temperature of 25°C (298 K).
The standard reaction entropy (ΔS°) of a reaction can be calculated using the standard molar entropies (S°) of the reactants and products. The formula to calculate the standard reaction entropy is:
ΔS° = ΣS° (products) - ΣS° (reactants)
To calculate the standard reaction entropy for the reaction: N2(g) + 3 H2(g) → 2 NH3(g)
S° (N2) = 191.8 J/K·mol
S° (H2) = 130.6 J/K·mol
S° (NH3) = 192.5 J/K·mol
ΔS° = [2(S° (NH3)) - (S° (N2) + 3(S° (H2))]
ΔS° = [2(192.5) - (191.8 + 3(130.6))] J/K·mol
ΔS° = -196.3 J/K·mol
Hence, the standard reaction entropy of N2(g) + 3 H2(g) → 2 NH3(g) is -196.3 J/K·mol.
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Why does platinum metal make a good catalytic surface for reactant molecules?
It causes reactant molecules to be less reactive.
It strengthens bonds between reactant molecules.
It prevents products from breaking away from the surface.
It holds reactant molecules in a good position for them to react.
Answers
Answer:
it holds reactant molecules in a good position for then to react
Answer:
D. It holds reactant molecules in a good position for them to react.
Explanation:
Got a 100 on e2020.
the potassium- nuclide radioactively decays by positron emission. write a balanced nuclear chemical equation that describes this process.
Answers
The potassium nuclide, symbolized as K, decays by positron emission, which means that it emits a positron (a particle with the same mass as an electron but with a positive charge). The resulting nuclide is one atomic number lower and has the same mass number. Here is the balanced nuclear chemical equation for the decay of potassium by positron emission:
39 19 K → 39 18 Ar + 0 1 e + + ν
In this equation, the atomic number (or the number of protons) is shown as a subscript on the left-hand side and the mass number (or the number of protons plus neutrons) is shown as a superscript. The positron emission is shown as 0 1 e +, and the antineutrino (ν) is also emitted to balance the equation. The resulting nuclide on the right-hand side is argon, symbolized as Ar.
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what is the change in elevation between points a and b?
a. 150 m
b. 900m
c. 100 m
d. 0 m
