a solution containing 20.0 g of an unknown non-electrolyte liquid and 110.0 g water has a freezing point of -1.32 °c. given kf = 1.86°c/m for water, the molar mass of the unknown liquid is ____g/mol.
Answers
The molar mass of the unknown non-electrolyte liquid is given as
256 g/mol, option A.
The ratio between the mass and the amount of substance (measured in moles) of any sample of a chemical compound is known as the molar mass (M) in chemistry. The molar mass of a material is a bulk attribute rather than a molecular one.
ΔTemp.f = i x Kf x b
where,
ΔTemp.f = the freezing-point depression;
i = the Van't Hoff factor
Kf = the cryoscopic constant of the solvent;
b = the molality of the solution.
Solving for the molality, b = ΔTemp.f/( i * Kf)= 1.32/(1*1.86)
= 0.71 mol/kg
Converting from mol/kg to mol/g,0.71 mol/kg * 1kg/1000g
= 0.00071 mol/g.
Mass of solvent = 110gNumber of moles = mass * molality
= 0.00071 * 110
= 0.078 mol.
To calculate molar mass,Molar mass (g/mol) = mass/number of moles
Mass of solute (liquid) = 20g
Molar mass = 20/0.078
= 256.2 g/mol. ≈ 256 g/mol
Therefore, molar mass of the unknown liquid is 256.2 g/mol.
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Complete question:
A solution containing 20.0 g of an unknown non-electrolyte liquid and 110.0 g water has a freezing point of -1.32 °c. given kf = 1.86°c/m for water, the molar mass of the unknown liquid is ____g/mol.
A)256B) 69.0 C) 619 D) 78.1
The molar mass of the unknown liquid is 256.5 g/mol.To solve this problem, we can use the formula for calculating the freezing point depression: ΔTf = Kf·m·i
where ΔTf is the change in freezing point (in °C), Kf is the freezing point depression constant (in °C/m), m is the molality of the solution (in mol/kg), and i is the van't Hoff factor (which is 1 for non-electrolytes).
First, we need to calculate the molality of the solution:
molality = moles of solute / mass of solvent (in kg)
We know that the mass of the solvent (water) is 110.0 g, which is 0.1100 kg. To find the moles of solute (the unknown liquid), we need to divide its mass (20.0 g) by its molar mass (which we don't know yet). Let's call the molar mass "M":
moles of solute = 20.0 g / M
So, the molality is:
molality = (20.0 g / M) / 0.1100 kg
molality = (20.0 / M) / 0.1100 mol/kg
Now, we can plug this into the formula for freezing point depression:
ΔTf = Kf·m·i
-1.32 = 1.86·[(20.0 / M) / 0.1100]·1
Simplifying this equation, we get:
-1.32 = 1.86·(181.8 / M)
-1.32 = 338.628 / M
M = 338.628 / 1.32
M = 256.5 g/mol
Therefore, the molar mass of the unknown liquid is 256.5 g/mol.
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Related Questions
Does the size of the solute (sugar) affect the rate of dissolving?
Answers
Answer:
Yes
Explanation:
The rate at which a solute dissolves depends upon the size of the solute particles. Dissolving is a surface phenomenon since it depends on solvent molecules colliding with the outer surface of the solute.
Brainliest?
who was the first person to create the periodic table
Answers
Answer:
Dmitri Ivanovich Mendeleev
Explanation:
A Russian chemist Dmitri Ivanovich Mendeleev gave the framework of the periodic table in 1869
Answer:
the first person was Dimitri mendeleev
As fuel is burned in an airplane, it seems to disappear from the tank, suggesting that matter is destroyed during the reaction. Identify the scientific law that is of importance here. Explain why this is not true, and describe where the matter goes.
Answers
Answer:
Well we know that matter is neither created nor destroyed by chemical reactions or physical transformations. It is not destroyed it simply was converted to gas. =D
The scientific law that is of importance here is the 'Law of conservation of mass'.
The law of conservation of mass states that ' mass can neither be created nor be destroyed.In other words, a mass of an element before and after the chemical reaction remains the same.The airplane uses energy generated in the reaction of burning fuel to run the engine for movement.A fuel burned in an airplane had undergone a chemical reaction that converted fuel into a gaseous product.These gaseous products are then eliminated through exhaust from the airplane leaving the tank empty.No mass is destroyed during this process only conversion of mass took place.So, from this, we can conclude that the scientific law that is of importance here is the 'Law of conservation of mass'.
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(06.07 LC) Match each term to its description. Match Term Definition Carbon offset A) A reduction in greenhouse gas emissions as they are made elsewhere Cap and trade B) A permit that allows a certain amount of carbon emissions Carbon credit C) A system for controlling carbon emissions by allowing companies to trade Carbon neutrality D) A state of net-zero carbon dioxide emissions
Answers
Cap and trade is a system for controlling carbon emissions by allowing companies to trade.
What is emission?We know that the major issue that faces the planet is the matter of carbon emissions that affect the ecosystem. This carbon emission has caused a steady rise in the temperature of the earth and this is called global warming.
The following is the matching of the terms as shown below;
Cap and trade - A system for controlling carbon emissions by allowing companies to trade
Carbon neutrality - A state of net-zero carbon dioxide emissions
Carbon credit - A permit that allows a certain amount of carbon emissions
Carbon offset - A reduction in greenhouse gas emissions as they are made elsewhere
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When an object is pushed by a force and moves in the direction of the force, work is done on the object. The amount of work equals the force times the distance (W = Fd). A small particle is pushed by a force of 2.6 × 10-4 newtons over a distance of 3.7 × 10-3 meters. How much work was done on the particle? Express the answer to the correct number of significant figures and in proper scientific notation. The force did × 10 newton-meters of work on the particle.
Answers
Explanation:
\(workdone = force \times distance \\ W = (2.6 \times {10}^{ - 4} ) \times (3.7 \times {10}^{ - 3} ) \\ W = 9.62 \times {10}^{ - 7} \: joules\)
The formula W = Fd, where W is the amount of work done, F is the force, and d is the distance, is used to determine how much work is done on a particle when it is pushed by a force. The force and distance in this issue are 2.6 10-4 newtons and 3.7 10-3 metres, respectively.
What is the way to calculate the work done ?We add the force and distance together to determine the work done: 9.62 10-7 newton-meters are equal to W = 2.6 10-4 newtons x 3.7 10-3 metres. The response must be presented using the appropriate scientific notation and significant numbers.
The solution should include three significant figures, just like the numbers in the problem, which have three. Therefore, 9.62 10-7 newton-meters is the correct answer.
This response uses appropriate scientific language.notation because the exponent is a negative power of 10 and the coefficient ranges from 1 to 10. In conclusion, the particle underwent work from the force of 9.62 10-7 newton-meters. This response uses the appropriate scientific notation and the correct number of significant digits.
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please help asap Which characteristic is most likely determined by biological factors? (4 points) Athleticism Hair style Political views Work ethic
An infant turns toward the sound of the mother's voice. What does this demonstrate? (4 points)
The response is a learned behavior demonstrating attachment to a caregiver.
The response is an unlearned behavior demonstrating the ability to form emotional connections.
The response demonstrates the importance of the biological need for food.
The response demonstrates insecure attachment to a caregiver.
Answers
This viewpoint contends that biological and genetic variables have an impact on personality. One illustration of the way a biological perspective may be utilised to explain human personality is temper.
What part does genetics play in behavioural science?A few behavioural and psychological features that each person's DNA can influence include intelligence, personality, and propensity for mental illness. The both adults and the children in a family may be impacted by these characteristics.
Are biological characteristics a determining role in personality?According to Hans Eysenck's theory, personality has a biological basis and that genetic legacy contributes to personality differences [62,115]. Extraversion, neuroticism, and psychoticism are the three independent super-factors in the Eysenck model.
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Answer:
The response is an unlearned behavior demonstrating the natural ability to form emotional connections.
Explanation:
I just know (;
What is added to make solid ice change to liquid water and then to gaseous steam.
Answers
Answer: heat
Explanation: if solid ice is heated it becomes in liquid and then to gaseous steam.
4. Completa el texto con las siguientes palabras del listado. La contaminación por ? Es una alteración ? Que destruye la vegetación, ? Y el suelo y afecta el ? , es el resultado de la quema de ? Y gases industriales nocivos.
Answers
Answer:
Actividades humanas y vida marina.
Explicación:
La contaminación ocurre por actividades humanas que se considera una alteración en el medio ambiente. Esta contaminación provocada por el ser humano puede destruir la vegetación, el suelo y afectar negativamente a la vida marina. Esta destrucción que se produce en el medio ambiente es el resultado de la quema de combustibles fósiles que liberan gases industriales nocivos en la atmósfera por lo que si queremos proteger nuestro medio ambiente de mayores daños tenemos que reducir las actividades que provocan la liberación de gases nocivos en la atmósfera. .
Match the formula to the correct name. (3 points) 1. LiClO4 2. LiCl 3. LiClO2 a. Lithium perchlorate b. Lithium chloride c. Lithium chlorite
Answers
Answer:
B
A
C
Explanation:
LiClO4= B) Lithium perchlorate
LiCl= A) Lithium chloride
LiClO2= C) Lithium chlorite
Hope this helps
The correct match of the formula to its name is LiClO₄ is Lithium perchlorate , LiCl is Lithium Chloride and LiClO₂ is Lithium Chlorite.
What is Common nomenclature ?A common name is defined by the IUPAC as a name that unambiguously defines a chemical, yet does not follow the current systematic naming convention.
Therefore, The correct match of the formula to its name is LiClO₄ is Lithium perchlorate , LiCl is Lithium Chloride and LiClO₂ is Lithium Chlorite.
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There are only seven base units of the metric system.
Which of the below is NOT a base unit of the metric system.
A. K for temperature
B. kg for mass
C. V for volume
D. s for time
Answers
Explanation:
V is not an SI base unit. (C)
Volume can be expressed as m³ in units.
In turn, m is the SI base units for length.
What is the PH of a solution that is 0.4mol/L Na lactate and 0.2mol/L lactic acid? (Pka lactic acid=3.73)
Answers
The pH of a solution that contains 0.4 mol/L of Na lactate and 0.2 mol/L of lactic acid can be calculated using the Henderson-Hasselbalch equation.
The equation is given as:pH = pKa + log([A-]/[HA])Where,pH = the acidity or alkalinity of the solutionpKa = -log(Ka) where Ka is the acid dissociation constant of the weak acid [HA][A-] = the concentration of the conjugate base and weak acid respectively.
The given problem states that the pKa of lactic acid is 3.73. We have to use this information to calculate the pH of the solution. First, we will write the dissociation equation of lactic acid in water.HC3H5O3 + H2O ⇔ C3H5O3- + H3O+Here,HC3H5O3 = Lactic acidC3H5O3- = Lactate ionWe know thatKa = [H3O+][C3H5O3-] / [HC3H5O3]Let the concentration of lactic acid be C and lactate ion be A.C = 0.2 MC3H5O3- = 0.4 MThe concentration of H3O+ is unknown. We have to calculate the pH of the solution by using the Henderson-Hasselbalch equation.pH = pKa + log([A-]/[HA])pH = 3.73 + log(0.4/0.2) = 3.73 + log(2) = 3.73 + 0.301= 4.031Thus, the pH of the given solution is approximately 4.031.
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Based on the information in the tables, which salt will produce the greatest change in temperature when dissolved in water at 20 c
Answers
Answer:
See Explanation Note ...
Explanation:
Depending on amount added, Anhydrous CaCl₂ when dissolved in water solvent can become hot enough to blister ones skin when touched. On the cold side, Ammonium Nitrate will cool an aqueous solution enough to generate condensate frost on the outside of a glass beaker. I'm sure there are more examples but these two came to mind.
Answer:
KOH
Explanation:
I took the test
A cup of coffee(140g) cools from 75 degrees Celsius down to comfortable room temperature 20 degrees Celsius. How much energy does it release to the surroundings.
Answers
Energy releases to the surroundings = -32.2 kJ
Further explanationHeat can be calculated using the formula:
Q = mc∆T
Q = heat, J
m = mass, g
c = specific heat, joules / g ° C
∆T = temperature difference, ° C / K
mass of coffee(m) = 140 g
∆T = temperature difference :
final temperature - initial temperature = 20-75=-55°C
specific heat coffee= specific heat water = 4.18 J/g° C
The heat releases :
\(\tt Q=140\times 4.18\times -55\\\\Q=-32186~J\approx -32.2~kJ\)
a scale model of the solar system
Answers
A solution has a pH of 4. 20. Using the relationship between pH and pOH, what is the concentration of OH−? A. 9. 9 × 10-1 M B. 6. 2 × 10-1 M C. 6. 3 × 10-5 M D. 6. 7 × 10-6 M E. 1. 6 × 10-10 M.
Answers
1.6 x 10⁻¹⁰ M is the concentration of OH− ion of the solution has a pH of 4.20.
How we calculate the pH of any solution?pH of any solution is define as the negative logarithm of the concentration of hydrogen ions i.e. pH = -log[H⁺].
Equation of pH will be written in the form of base 10 by removing the log as:
[H⁺] = \(10^{-pH}\)
Given value of pH is 4.20 and concentration of H⁺ ions will be calculated as:
[H⁺] = 10⁻⁴°²⁰
[H⁺] = 6.3 × 10⁻⁵
Now the relation between pH & pOH in term of base 10 is:
[H⁺][OH⁻] = 10⁻¹⁴
[OH⁻] = 10⁻¹⁴ / [H⁺]
[OH⁻] = 10⁻¹⁴ / 6.3 × 10⁻⁵ = 1.6 x 10⁻¹⁰ M
Hence, option (E) is correct i.e. 1.6 x 10⁻¹⁰ M.
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What is true about wind?(1 point)
Wind can only be warm.
Wind can only be warm.
Wind cannot cause things to move.
Wind cannot cause things to move.
Wind can be still.
Wind can be still.
Wind is always safe.
Wind is always safe.
Answers
Answer:
safe? I guess it to me
Answer:
I think c.
Explanation:
I am not sure tho
Identify the fundamental particles that make up a proton.
Answers
Answer:
The three main quarks that make up a proton are two up quarks and one down quarks which is the main reason protons are positive aswell.
Carbon exists in many forms on Earth. The diagram below shows part of the carbon cycle. What is happening in Step 1? *
1 point
Captionless Image
Animals are decomposing and releasing carbon into the soil.
Animals are breaking down organic molecules and releasing carbon dioxide into the atmosphere.
Animals are releasing energy into the environment and storing carbon.
Animals are converting carbon dioxide from the atmosphere to oxygen.
Answers
The first step of carbon cycle is animals are breaking down organic molecules and releasing carbon dioxide into the atmosphere.
What is a carbon cycle?Carbon cycle completes into four steps: photosynthesis, decomposition, respiration, and combustion.
In the first step, carbon enter the environment by respiration, and in the second step, carbon dioxide is consumed by plants.
Thus, the correct option is B.
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How many bromide ions are there in 2.00g of MgBr2?
Answers
There are 1.31 x 1022 bromide ions in 2.00 g of \(MgBr_2\).
The chemical formula of magnesium bromide (\(MgBr_2\)) contains one magnesium ion (\(Mg2^+\)) and two bromide ions (Br-). To find the number of bromide ions in 2.00 g of \(MgBr_2\), we need to use the molar mass of \(MgBr_2\) to determine the number of moles of \(MgBr_2\) present in 2.00 g of the compound, then use the stoichiometry of the chemical formula to determine the number of bromide ions present. First, we need to calculate the molar mass of \(MgBr_2\). The molar mass of \(MgBr_2\) is equal to the sum of the atomic masses of magnesium (Mg) and two bromine (Br) atoms. The atomic mass of Mg is 24.31 g/mol, and the atomic mass of Br is 79.90 g/mol. Molar mass of \(MgBr_2\) = 24.31 g/mol + (2 x 79.90 g/mol) = 184.11 g/mol Next, we can use the molar mass to determine the number of moles of \(MgBr_2\) present in 2.00 g of the compound: Number of moles of \(MgBr_2\) = mass of \(MgBr_2\) / molar mass of \(MgBr_2\)= 2.00 g / 184.11 g/mol
= 0.0109 mol Finally, we can use the stoichiometry of the chemical formula to determine the number of bromide ions present: Number of bromide ions = 2 x number of moles of \(MgBr_2\)
= 2 x 0.0109 mol
= 0.0218 mol Therefore, there are 0.0218 moles of bromide ions in 2.00 g of \(MgBr_2\). To convert this to the number of bromide ions, we can multiply by Avogadro's number (6.02 x 1023): Number of bromide ions = 0.0218 mol x 6.02 x 1023 ions/mol = 1.31 x 1022 ions
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Define symbol ..........
Answers
Answer:
Hey mate here's your answer ⤵️
a mark or character used as a conventional representation of an object, function, or process, e.g. the letter or letters standing for a chemical element or a character in musical notation.
Hope it was helpfulllnoun: letter, character, sign of written communication
Something used for or regarded as representing something else; a material object representing something,
or a character of some kind
Example:
Often something immaterial; emblem, token, or sign: "$"<< the dollar sign is a symbol used to show / means money
Hope this kinda helped
When copper metal is added to silver nitrate
in solution, silver metal and copper(II) nitrate
are produced. What mass of silver is produced
from 52 g of Cu?
Answer in units of g.
Answers
Step 1: Write the chemical equation:
2Cu + AgNO₃ → Cu(NO₃)₂ + Ag
Step 2: Calculate the moles of Cu:
n(Cu) = mass/Ar
n(Cu) = 52 / 63.546
n(Cu)= 0.818 mol
Step 3: Find the mole ratio between Cu an Ag and figure out the moles of Ag
Cu : Ag
2 : 1
0.818 : 0.818 / 2
0.818 : 0.409
Thus, n(Ag) = 0.409 mol
Step 4: Find the mass of Ag:
Mass of Ag = moles × Ar.
Mass = 0.409 × 107.8682
Mass = 44.11g
What are the substances present before a chemical reaction takes place?
Answers
The substances present before a chemical reaction takes place are Reactants.
When the reactants interact, one or more new products are created that are distinct from the reactants. However, in the chemical equation that depicts the reaction, the mass and charges are conserved, remaining constant on both sides of the equation.
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What was the weakness of the rutherford model of the atom that bohr addressed?
Answers
The weakness of the rutherford model of the atom that bohr addressed is that
The energy of the atom is quantized andThe atom does not lose energy as the electon rotates about the nucleusWhat is Rutherford model of the atom?The Rutherford model of the atom proposed by Ernest Rutherford in 1911 shows that the atom is much hollow space with its mass concentrated at the center being surrounded by electrons. It is the planetary model.
What is the Bohr model of the atom?The Bohr model of the atom proposed by Neils Bohr in 1913 suggests that
the energy of an atom is quantized and that it does not lose energy as the electron rotates about the nucleus.What was the weakness of the rutherford model of the atom that bohr addressed?The weakness of the rutherford model of the atom that bohr addressed is that
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Which statement accurately describes liquids?
Answers
Answer:
what are the statments?
Explanation:
which of the following statements about disulfide bond formation is false? . group of answer choices (a) disulfide bonds do not form under reducing environments grow from both ends, the growth rate is faster at the plus ends. (b) disulfide bonding occurs by the oxidation of pairs of cysteine side chains on the protein. (c) disulfide bonding stabilizes the structure of proteins. (d) disulfide bonds form spontaneously within the er because the lumen of the er is oxidizing
Answers
The false statement about disulfide bond formation is (d) disulfide bonds form spontaneously within the ER because the lumen of the ER is oxidizing. Disulfide bonds do form within the ER, but not spontaneously.
Instead, they are formed by the action of enzymes called protein disulfide isomerases (PDIs). PDIs catalyze the oxidation of cysteine residues to form disulfide bonds. Disulfide bonding (b) stabilizes the structure of proteins, and (a) disulfide bonds do not form under reducing environments. Additionally, disulfide bonds do not (c) grow from both ends, the growth rate is faster at the plus ends. Instead, they are formed between two cysteine residues on the same polypeptide chain or between different polypeptide chains.
The false statement about disulfide bond formation among the given choices is (a) disulfide bonds do not form under reducing environments grow from both ends, the growth rate is faster at the plus ends. This statement is unrelated and incorrect. In reality, disulfide bonds (b) form by oxidation of cysteine pairs, (c) stabilize protein structures, and (d) form spontaneously within the ER due to its oxidizing environment. Disulfide bonds play a vital role in maintaining the proper folding and stability of proteins, especially those secreted or located in extracellular environments.
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How many moles of O2 would there be if I had 4 moles of Fe
Answers
4 moles of Fe react with 3 moles of oxygen. Therefore, the mole ratio of iron to iron oxide in this process is 4:2.
What is oxygen ?The chemical element with the atomic number 8 and symbol O is called oxygen. It belongs to the periodic table's halogen group, is a very reactive nonmetal, and an oxidizing agent that easily produces oxides with most elements as well as other compounds.
The non-metallic element oxygen occurs naturally as a molecule. Two oxygen atoms that are tightly bound together make up each molecule. Oxygen is in a gaseous form at ambient temperature due to its low melting and boiling temperatures.
According to scientists, the oceans produce between 50 and 80 percent of the oxygen used on Earth. Oceanic plankton, which includes floating plants, algae, and certain bacteria that can photosynthesize, is the main source of this production.
Thus, 4 moles of Fe react with 3 moles of oxygen.
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Question 7 of 10 Which statement is the best description of a chemical bond? O A. A chemical bond holds atoms together. OB. A chemical bond connects 2 different molecules. OC. A chemical bond turns molecules into atoms. OD. A chemical bond identifies atoms in a molecule.
Answers
The best description of a chemical bond is A: "A chemical bond holds atoms together."
A chemical bond refers to the force of attraction between two or more atoms that holds them together to form a stable chemical compound. Atoms bond together by sharing, gaining, or losing electrons, resulting in the formation of molecules or compounds.
Chemical bonds are essential for the formation of substances and play a crucial role in determining the properties and behavior of matter. They involve the interaction of valence electrons, the outermost electrons in an atom, which are responsible for chemical bonding.
In summary, option A provides the most accurate and comprehensive description of a chemical bond, emphasizing its role in holding atoms together to form stable compounds. Therefore, Option A is correct.
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The second step in the Gram staining procedure involves flooding the slide for one minute with ____
A. a decolorizing agent. B. iodine. C. safranin.
Answers
The second step in the Gram staining procedure involves the flooding of the slide for the one minute is with iodine . The correct option is B. iodine.
There are the four fundamental steps in the Gram stain process , the first is to apply a base color that is the crystal violet. In second step adding the Gram's iodine as the mordant. In the third step, the Rapid decolorization with the acetone, the ethanol, or the combination of the two and in the four step, Using the safranin as the counterstain.
Thus, the iodine will be used in the second step in the Gram staining process that involves the flooding in the slide for one minute.
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Molecules are always in motion. True False
Answers
Answer: FALSE
Explanation:
the causes of air pollution (human activities and natural reasons)
Answers
Answer:
These are largely the result of human reliance on fossil fuels and heavy industry, but can also be due to the accumulation of waste, modern agriculture, and other man-made processes. The combustion of fossil fuels like coal, petroleum and other factory combustibles is a major cause of air pollution