A solution contains 0.35 mol of isopropanol (C₃H₇OH) dissolvedin 0.85 mol of water. (b) The mass percent?
Answers
The mass percentage of the solution is 137.2% .
What is mass percent of a solution?The mass percent is described as the grams of solute per grams of solution, multiplied by 100 to get Percentage. The mass percent formula is expressed as solving for the molar mass also for the mass of each element in 1mole of the compound.
Mass percentage→mass of solute×100/mass of solution .
We have given here the moles of isopropanol are 0.35 mol and moles of water are 0.85 ,molar mass of isopropanol is 60g/ mol and the molar mass of water is 18g/ mol .
Mass of isopropanol=35×60→2.10g
mass of H20 is 85×18→15.30g
Mass percent →2.10×100/15.30
mass percentage→137.2%
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Related Questions
The radioisotope that has the longest half-life is the best to use in powering planet and space exploration vehicles because they can travel farther. which radioisotope is the best to use? lithium-5 uranium-240 carbon-14 plutonium-239
Answers
The best radioisotope to use in powering planet and space exploration is plutonium-239 since it has the longest half-life of 21400 years.
What is Half-Life of radioactive element?The half-life ofa radioactive element is the time it takes for half the amount of atoms in the element to spontaneously decay.
The half-life of radioactive elements vary.
The half life of the given radioactive elements are as follows:
lithium-5 is 3.038×10^-22 secondsuranium-240 is 14.1 hours carbon-14 is 5700 years plutonium-239 is 21400 yearsTherefore, the best radioisotope to use in powering planet and space exploration is plutonium-239 since it has the longest half-life of 21400 years.
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Answer:
D. ) Plutonium-239
A metal sample is heated and placed into the water in a calorimeter at room temperature. Which statement best describes how the calorimeter can be used to determine the specific heat capacity of the metal sample? Energy transfers to the metal from the water and calorimeter until they are all at room temperature. Energy transfers from the metal to the water and calorimeter until they are all at room temperature. Energy transfers to the metal from the water and calorimeter until they all reach a single temperature. Energy transfers from the metal to the water and calorimeter until they all reach a single temperature.
Answers
Answer:
Energy transfers from the metal to the water and calorimeter until they are all at room temperature.
Explanation:
Calorimetry is the process that is used to determine the amount of heat that has been transferred in any process. In any chemical or physical process, the amount of energy is required. This energy is measured by the process of calorimetry. A calorimeter is a device that is used in this process. The heat that has been used in the process is measured and the change in the temperature is noted.
Answer:
b
Explanation:
what is the molarity of a solution that was prepared by dissolving 82.0 g of CaCl2 in enough water to make 812 mL of solution
Answers
The molarity of a solution that was prepared by dissolving 82.0 g of calcium chloride in enough water to make 812 mL of solution is 0.91M.
How to calculate molarity?Molarity is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution
The Molarity of a solution can be calculated using the following formula:
Molarity = no of moles ÷ volume
According to this question, a solution was prepared by dissolving 82.0 g of calcium chloride in enough water to make 812 mL of solution. The molarity can be calculated as follows:
no of moles of Calcium chloride = 82.0g ÷ 110.98 g/mol = 0.74 mol
Molarity = 0.74 ÷ 0.812 = 0.91M
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What do cuticles do for land plants that was not necessary for ancestors that lived in water?
Answers
Answer:
What do cuticles do for land plants that was not necessary for ancestors that lived in water? Cuticles help prevent water loss. ... The next groups of land plants to evolve were ferns, which could grow bigger and taller because they could transport water and food.
Explanation:
An insulated cup contains 75. 0g of water at 24. 00oc. A 26. 00g sample of metal at 82. 25oc is added. The final temperature of the water and metal is 28. 34oc. What is the specific heat of the metal?.
Answers
An insulated cup contains 75 g of water at 24 °C. A 26 g sample of metal at 82.25°C is added. The final temperature of the water and metal is 28.34°C. The specific heat of the metal is 0.972 J/ g°C.
Given that :
Mass of the metal = 26 g
The specific heat of the metal = ?
Initial temperature of the metal = 82.25°C
Equilibrium temperature = 28.34°C
Mass of the water = 75 g
Specific heat of water = 4.18 J/ g°C
Initial temperature of the water = 24 °C
The specific heat capacity is given as :
26 × c × ( 82.25 - 28.34) = 75 × 4.18 ( 28.34 - 24)
26 × c × 53.91 = 313.5 × 4.34
c = 0.972 J/ g°C
Thus, the specific heat capacity of metal is 0.972 J/ g°C.
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What happen when hydrogen reacts with nitrogen at necessary conditons?
Answers
Answer:
Hydrogen gas combines with nitrogen to form Ammonia.
Convert 6.6 ft to meters. Use the
conversion factor 1 m = 3.3 ft
Answers
Answer:
2.01168 or 2.01 meters
Answer:
2.01 meters
Explanation:
Using the conversion process shown in the chart.
Inch to mm - multiply by 25.4. Yards to meters - multiply by .9144. mm to inch - multiply by .03937. Meters to yards - Multiply by 1.094.
Sq. in. to sq. cm - multiply by 6.452.
Cu. Ft. to Cu. M - multiply by .0283.
The Sun’s Influence on Atmosphere and Oceans
Note-taking Guide
Directions: Complete the note-taking guide using the words in the word bank below. To enter your answers, click on the blanks and type.
weather hurricanes poles convection currents warming salt
global conveyor belt surface currents dense equator
Loop Current salinity climate heat cooling wind
The Sun is the main energy source on Earth. Approximately
50%
of the
solar energy hitting Earth is absorbed by land and oceans.
This absorbed energy changes into
which can be transferred to
the atmosphere. As the air in the atmosphere then gets heated, it becomes
less
and rises.
Cool, dense air from other places flows in to replace this warm air, which we
feel as
.
This cool air eventually heats and starts to rise again. This continual process
of air closest to Earth’s surface warming, rising, cooling, and then sinking
creates
in the atmosphere.
Atmospheric winds that blow over the ocean surface create
that carry water around the globe.
Unequal heating of the oceans and differences in
also
create currents.
The Sun warms water at the
more than it does at the
high latitude Polar regions.
At the
, some water freezes. The water that doesn’t freeze
contains more
, making it denser.
As this cold, dense water sinks, the warm water from the equator moves
toward the poles to replace it.
This constant movement creates a deep ocean current called the
.
The global conveyor belt transfers heat from one part of the world to the
other, thus affecting the
and
in all parts
of the world.
Surface and deep ocean currents continually transfer warm and cold waters
around the globe.
As these waters warm or cool the air above it, winds blow the air over land,
it up or
it down.
The
in the Gulf of Mexico is an ocean current
that creates a warm layer of water in the gulf. This results in the growth of
several
that affect the Gulf Coast.
Answers
Answer:
bestie this is like 6th grade stuff
Explanation:
Which electron configuration could represent the electrons in a sodium atom in an excited state?
(1) 2-8
(2) 2-8-17
(3) 2-7-1
(4) 2-7-2
Answers
Answer:
2-7-2
Explanation:
Elements in which their valence atoms takes up higher energy orbitals compared to the ground state are said to be in an excited state. Hence, sodium atom in an excited state could have the electronic configuration 2 - 7 - 2
The number of atoms in sodium is 11. Hence, a ground state sodium would have the configuration ; 2, 8, 1 In an excited state, the outer shell could have more than 1 atom such as 2, 7, 2 ; with two atoms taking up the higher orbital instead of 1.Therefore, a possible representation of sodium atom in an excited state is 2 - 7 - 2.
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Which example is most likely an inorganic compound
Answers
Answer:
Inorganic compounds — simple molecules that usually consist of one or two different elements ; for example:
Water (H2O)
Carbon dioxide (CO2)
Bimolecular oxygen (O2)
Sodium chloride (NaCl)
Answer:
water (H2O)
Explanation:
water is the example of inorganic compound
Juan carlos placed 35 grams of ice into a dry, 200-gram container. The top of the container was attached tightly. When the ice was completely melted, he measured the mass of the container with the liquid water. What should the mass of the liquid water in the container be?.
Answers
To find the mass of the liquid water in the container, we need to consider the principle of conservation of mass. The total mass before and after the ice melts should be the same.
First, let's find the mass of the ice. Juan Carlos placed 35 grams of ice into the container. Next, let's find the total mass of the ice and the container before the ice melts. The mass of the container is given as 200 grams. Therefore, the total mass before the ice melts is 35 grams (mass of ice) + 200 grams (mass of container) = 235 grams.
Since the ice has completely melted, the mass of the liquid water should be the same as the total mass before the ice melts, which is 235 grams. So, the mass of the liquid water in the container should be 235 grams.
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Neutral atoms of all isotopes of a given element have the same
A) number of protons and neutrons
B) number of neutrons
C) number of electrons
D) mass numbers
E) masses
Answers
Neutral atoms of all isotopes of a given element have the same number of protons and neutrons.
All the isotopes of the same element consists of the same number of protons, which defines the element.
Depending on the neutron count, different isotopes can exist . This is because electrons are negatively charged and they can counterbalance the positive charge of protons. Also, they are present in equal numbers in neutral atoms of the same element.
Mass number is formed from the addition of protons and neutrons, which varies between isotopes. An isotope's mass can differ between different isotopes since it depends on its mass number and the masses of the particles that it is formed from.
However, the masses of various isotopes of the same element are extremely close. Hence, this can be challenging to distinguish without the help of specialized tools.
Thus, option (a) is correct.
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A student prepared 250 mL of a buffer solution containing an equal number of moles of
HClO and NaClO. Using a pH meter, the student measured the pH of the buffer solution
to be 7.52. To this solution, another student added 5 drops of 0.10 M HCl and
remeasured the pH of the solution. The process was repeated several times and the data was recorded in the table below.
Total HCl
added(drops) pH
0 7.52
5 7.52
10 7.52
20 7.52
30 7.52
40 7.52
50 7.51
Write a balanced net ionic equation for the reaction that occurs between HCl and the
species in the buffer solution that reacts with the HCl. Explain, based on this reaction,
why the pH did not significantly change with the addition of HCl(aq).
Answers
The net ionic equation of the reaction is:
H⁺ + ClO⁻ ---> HClO (l)The pH does not change significantly because the conjugate base reacts with the acid to neutralize it and form a weak acid.
What is a buffer solution?A buffer solution is a solution that resists changes to its pH when a small quantity of strong acid or strong bases is added to it.
Buffer solutions are able to resist changes in their pH as a result of the composition of the buffer solution.
Buffer solutions are made from a mixture of a weak acid and its conjugate base or a weak base and its conjugate acid.
The buffer solution that is prepared from HClO, a weak acid, and NaClO, its conjugate base dissociates as follows in solution when a small quantity of a strong acid or base is added to it.
When HCl is added to the buffer, the ionic equation that occurs is as follows:
NaClO + HCl ---> NaCl (aq) + HClO (l)
The net ionic equation is H⁺ + ClO⁻ ---> HClO (l)
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a gc analysis of a mixture containing two compounds dissolved in pentane produced the following peak areas: compound 1 5 23.2, compound 2 5 56.3, and pentane 5 203.5. relative mf values are 0.85 for compound 1 and 1.00 for compound 2. calculate the corrected mol % for compounds 1 and 2 in the mixture.
Answers
the corrected mol % for compounds 1 and 2 in the mixture is 29.2 and 70.8 respectively.
Calculation :
In Gas Chromatography (GC),
% mol is calculated as,
% mol = (Peak area / Total peak area) x 100
For compound 1:
% mol = (23.2 /23.2 + 56.3) x 100 = 29.2
For compound 2:
% mol = (56.3 / 23.2 + 56.3) x 100 = 70.8
Gas chromatography (GC) is a common type of chromatography used in analytical chemistry to separate and analyze compounds that can be vaporized without decomposition. Typical applications of GC include testing the purity of specific substances and separating various components of mixtures [1]. Preparative chromatography can use GC to produce pure compounds from mixtures
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what is the agriculture thallium?
Answers
Answer:is a trace metal of severe toxicity. Its health concerns via consumption of contaminated vegetables have often been overlooked or underestimated
Explanation: Read it carefully and it explains
Is H2SO4 the conjugate acid of SO4^2-? Select the single best answer. O Yes, because both contain SO4^2-. O No, because both contain SO4^2-. O No, because they differ by two hydrogen ions. O Yes, because they differ by two hydrogen ions.
Answers
Yes, H₂SO₄ is the conjugate acid of SO₄²⁻, because they differ by two hydrogen ions.
In a conjugate acid-base pair, the acid and base differ by a single proton (H⁺). In this case, H₂SO₄ loses two hydrogen ions (2H⁺) to become SO₄²⁻.
When H₂SO₄ donates its two protons, it forms the conjugate base SO₄²⁻, and when SO₄²⁻ accepts two protons, it forms the conjugate acid H₂SO₄.
Although they differ by two hydrogen ions instead of one, they still constitute a conjugate acid-base pair because the loss and gain of protons are involved in their interconversion.
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A chemical ____ is a force of attraction between atoms or
ions that share or transfer valence electrons.
Answers
A chemical bond is a force of attraction between atoms or ions that share or transfer valence electrons.
determine the value of kp at 25 °c for the reaction i2(g) cl2(g) ⇌2 icl(g) given that the standard free energies of formation for i2(g) and icl(g) are 62.42 kj/mol and 25.75 kj/mol, respectively.
Answers
The value of Kp at 25 °C for the reaction I2(g) + Cl2(g) ⇌ 2 ICl(g) is 1305.57.
The equilibrium constant Kp at 25 °C can be determined using the standard free energy change (∆G°) of the reaction and the following equation:
∆G° = -RT ln Kp
where R is the gas constant (8.314 J/K·mol), T is the temperature in Kelvin (25 + 273.15 = 298.15 K), and ln is the natural logarithm.
The reaction can be written as:
I2(g) + Cl2(g) ⇌ 2 ICl(g)
The standard free energy change (∆G°) for the reaction can be calculated as follows:
∆G° = ∑∆G°f(products) - ∑∆G°f(reactants)
∆G° = 2∆G°f(ICl(g)) - ∆G°f(I2(g)) - ∆G°f(Cl2(g))
∆G° = 2(-25.75 kJ/mol) - 62.42 kJ/mol + 0 kJ/mol
∆G° = -51.92 kJ/mol
Substituting the values into the equation for ∆G° and solving for Kp, we get:
-51.92 kJ/mol = -8.314 J/K·mol × 298.15 K × ln Kp
ln Kp = -51.92 kJ/mol ÷ (-8.314 J/K·mol × 298.15 K)
ln Kp = 7.18
Kp = e^(7.18) = 1305.57
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The value of Kp at 25°C for the reaction \(I_{2}\)(g) + \(Cl_{2}\)(g) ⇌ 2ICl(g) is approximately 1718. The value of Kp can be determined using the equation ΔG° = -RTlnK.
The value of Kp at 25°C for the reaction \(I_{2}\)(g) + \(Cl_{2}\)(g) ⇌ 2ICl(g) can be determined using the equation ΔG° = -RTlnK, where ΔG° is the standard free energy change, R is the gas constant, T is the temperature in Kelvin, and K is the equilibrium constant.
First, we need to calculate the standard free energy change for the reaction using the free energies of formation for \(I_{2}\)2(g) and ICl(g) provided. The equation for the standard free energy change is:
ΔG° = ΣnΔGf°(products) - ΣmΔGf°(reactants)
where ΔGf° is the standard free energy of formation, and n and m are the stoichiometric coefficients of the products and reactants, respectively. Plugging in the values, we get:
ΔG° = (2 x ΔGf°(ICl(g))) - (ΔGf°(I2(g)) + ΔGf°(\(Cl_{2}\)(g)))
ΔG° = (2 x -25.75 kJ/mol) - (62.42 kJ/mol + 0 kJ/mol)
ΔG° = -51.5 kJ/mol
Next, we can use the equation ΔG° = -RTlnK to solve for Kp at 25°C. The gas constant R is 8.314 J/(mol·K), and 25°C is 298 K. Converting kJ to J, we get:
-51,500 J/mol = -(8.314 J/(mol·K) x 298 K) x lnKp
lnKp = 5.13
Kp = \(e^(5.13)\)
Kp ≈ 1718
Therefore, the value of Kp at 25°C for the reaction \(I_{2}\)(g) +\(Cl_{2}\)(g) ⇌ 2ICl(g) is approximately 1718.
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Which of the following statements on HPLC modes is true? A. Increasing the polarity of the mobile phase decreases the elution time of polar compounds in normal-phase HPLC B. A non-polar stationary phase is used in normal-phase HPLC C. Compounds have a lower attraction to the mobile phase than to the stationary phase in displacement development D. A polar stationary phase is used in reversed-phase HPLC E. More polar compounds elute first in normal-phase HPLC
Answers
The following statements on HPLC modes are true is more polar compounds elute first in normal-phase HPLC (Option E).
The liquid chromatography (HPLC) is a technique in analytical chemistry employed for the separation, identification, and quantification of elements. It is considered a highly sensitive method, and it works by separating the components in a mixture with the assistance of a solvent under high pressure.
There are two modes of HPLC: Reversed-Phase HPLC (RP-HPLC) and Normal-Phase HPLC (NP-HPLC). In RP-HPLC, a nonpolar stationary phase, such as C18, is used, and polar solvents, such as water, are used as mobile phases. Polar stationary phases, such as silica gel, are used in NP-HPLC, while nonpolar solvents, such as hexane, are used as mobile phases.
More polar compounds have a greater affinity for the polar stationary phase than less polar compounds, which have a higher affinity for the nonpolar mobile phase in NP-HPLC. As a result, less polar compounds elute first in normal-phase HPLC.
Thus, the correct option is E.
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why is a sodium a metal?
Answers
Answer:
YesEdit: sorry I thought you asked "Is Sodium a metal?" It is a metal because it is on the left side of the periodic table and it has metallic properties such as:
It is malleable
Shiny when polished
Forms positive ions when it reacts
And has a high boiling pointpoint
Explanation:
Round each number to four significant figures
a. 84,791
b. 256.75
C. 431,801
d. 0.00078100
Answers
Answer:
a.
84,791 » 8479
b.
256.75 » 256.8
c.
431,801 » 4318
d.
0.00078100 » 0.0007810
Explanation:
\(.\)
Can you help me with the blanks please?
Answers
what ive learned about heat,sound and light
Answers
Answer:
they are all in parts of our life and we need them each for surviving.
Explanation:
2 moles of NO, was placed in an empty I dm' bottle and allowed to reach equilibrium according to the equation:
At equilibrium, 1.2 moles of N,O, dissociated. Calculate the value of the equilibrium constant for the reaction at that
temperature.
Answers
2NO(g) ⇌ N2(g) + O2(g)
According to the problem statement, 2 moles of NO were placed in a 1 dm^3 bottle and allowed to reach equilibrium, and at equilibrium, 1.2 moles of NO had dissociated. This means that the initial concentration of NO was:
[NO]initial = 2 mol / 1 dm^3 = 2 M
And the concentration of NO at equilibrium is:
[NO]equilibrium = (2 - 1.2) mol / 1 dm^3 = 0.8 M
Since the stoichiometry of the balanced equation is 2:1:1 for NO, N2, and O2, respectively, the equilibrium concentrations of N2 and O2 will also be 0.6 M.
The equilibrium constant (Kc) can be calculated using the equilibrium concentrations of the reactants and products, raised to the power of their stoichiometric coefficients. Therefore:
Kc = ([N2][O2]) / ([NO]^2)
Substituting the equilibrium concentrations into the equation, we get:
Kc = (0.6 M x 0.6 M) / (0.8 M x 0.8 M)
Kc = 0.5625
Therefore, the value of the equilibrium constant for the reaction at that temperature is 0.5625. Note that the units of Kc depend on the stoichiometry of the balanced equation. Since the stoichiometric coefficients are all 1, the units of Kc in this case are M^-1
Pls help ASAP I DONT have time IT ALSO DETECTS IF ITS RIGHT OR WRONGG
Answers
Answer:
Answer for Microhabitat
Explanation:
A micro habitat is a small area which differs somehow from the surrounding habit. It’s unique conditions are sometimes the home to very unique species that aren’t usually find in a larger region or area.
Write the structure of two isomers of hydrocarbon
Answers
Answer:
not sure
Explanation:
Do covalent or ionic bonds have larger molecules
Answers
Answer:
No they not have larger Molecules .In covalent bonds, atoms share electrons, whereas in ionic bonds atoms transfer electrons. The reaction components of covalent bonds are electrically neutral, whereas for ionic bonds they are both charged. Covalent bonds are formed between two non-metals, whereas ionic bonds are formed between a metal and non-metal.Hope this helps you !!Track runners will all cover the same distance. The winner will take:
A. more time than the other runners
B. less time than the other runners
C. the same time as the other runners
D. half as much time as the other runners
Answers
Answer:
option B. less time than the other runners
hope it helps you
Track runners will all cover the same distance. The winner will take less time than the other runners. Therefore, the correct option is option B.
What is distance?Despite the direction of something like the journey, distance is the overall path that an item in motion has traveled. Since just the length of the path travelled is calculated as well as the motion direction is ignored, distance is referred to as a scalar number.
Displacement is described as the overall alteration of an object's location and motion direction. Displacement is recognized as a vector quantity since it takes into consideration both the directions of the motion and the amount of the changing position. Track runners will all cover the same distance. The winner will take less time than the other runners.
Therefore, the correct option is option B.
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Please Helppppp:(((((
Answers
Answer:
what we have to do ? pls paste the whole question .
Explanation:
When a chemical reaction does not occur, what happens to the atoms of the two substances?
please make it sound like a 7th grdaer would say! <3
Answers
Answer:
In a chemical reaction, only the atoms present in the reactants can end up in the products. No new atoms are created, and no atoms are destroyed. In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.
Explanation:
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