The right answer is C) A solute's concentration affects a colligative property that causes a depression in freezing point.
What does chemistry mean by a colligative property?
Colligative qualities of solutions are characteristics that depend on the quantity of molecules or ions in the solute, but not on the kind of solute. Osmotic pressure, boiling point elevation, freezing point depression, and vapor pressure reduction are examples of ligand-like properties.
Why are colligative qualities given that name?
Colligative means "connected to the number" in Greek, which suggests that these attributes are related to the quantity of solute particles rather than their identities. These features are known as colligative properties.
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Chemistry give the number of significant figures: 6.32 g
There are 3 important numbers.All digits in significant figures that are not zeros.
How can you locate important numbers in chemistry? There are three important numbers.All digits in significant figures that are not zeros.as well as all zeros that, if deleted, would NOT alter the number.I realize that the words are backwards, but they are important for indicating where the measurement finishes. Basic Guidelines for Calculating the Number of Significant Figures All digits that are not zero have meaning.With two exceptions, zeros are also significant: those that come before the decimal point.In numbers greater than one, terminal zeros before the decimal point present an uncertain situation.(1) All significant numerals are non-zero:There are 2 major figures in 1.2 g and 4 significant figures in 1.234 g.(2) Significant zeros occur between non-zero digits:3.07 mL has three significant digits and 1002 kg has four.5 - The number 48.050 has 5 major digits.
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which of the following molecules would be polar? group of answer choices sco pcl5 ccl4 bcl3 co2
Sulfur dioxide (SO2) is polar in nature and the electronegativity difference between sulfur and oxygen atoms makes it a polar molecule.
Why is SO2 a polar covalent?Sulfur dioxide is the chemical compound with the formula SO2 and it is a toxic gas that is responsible for the odor of burnt matches.
SO2 has a bent shape due to the presence of unbonded electrons on the sulfur and oxygen atoms.
Solid sulfur dioxide is a polar molecular solid because net dipole moment is non zero and constituent particles are molecules and the electronegativity of sulfur is 2.5 and that of oxygen is 3.5.
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Calculate the limiting reactant for
4AsCl3+6H2O——> As406+12HCl
The limiting reactant is the one with the least mole ratio.
How to calculate the limiting reactant ?It is limiting to use the reactant with the smallest mole ratio. Magnesium is the limiting reactant, with a predicted stoichiometric mole ratio of 4.12.
By dividing the number of moles of each reactant by its stoichiometric coefficient in the balanced chemical equation, you may determine which reactant is the limiting one. Calculate the maximum number of moles of product that can be produced from the limiting reactant using mole ratios.
4AsCl3+6H2O——> As406+12HCl
As4O6 + 12HCl --> 4AsCl3 + 6H2O
Balance: As4O6 + Hal --> AsCl3 + H2O
AsCl3 + H2O -->As4O6 + Hal
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Question 3 (1 point)
Michelle is trying to find the average atomic mass of a sample of an unknown
element. She finds that her sample contains 28.49% of an isotope with a mass of
56.2925, while the rest of the sample is an isotope with a mass of 52.4566. What is
the average atomic mass of her sample? Please round your answer to 0.01 amu.
Your Answer:
Answer
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The average atomic mass of Michelle's sample is equal to 53.549 amu.
What is the natural abundance of elements?Natural abundance can be defined as the abundance of natural isotopes of a chemical element found on a planet. The relative atomic mass can be defined as the atomic weight of the element in the periodic table.
The natural abundance of an isotope is affected by the probability of its creation and by the production of an isotope as a daughter of the natural radioactive isotope.
The mass of one isotope = 56.2925 amu, relative abundance =28.49%
The relative abundance of the other isotope = 100 - 28.49 = 71.51 %
The mass of the other isotope = 52.4566 amu
Average atomic mass = 56.2925 × 0.2849 + 52.4566 × 0.7151
Average atomic mass = 16.0377 + 37.511
Average atomic mass = 53.549 amu
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in water, a substance that partially ionizes in solution is called a group of answer choices nonelectrolyte. nonconductor. weak electrolyte. strong electrolyte. semiconductor.
In water, a substance that partially ionizes in solution is called
nonelectrolyte.nonconductor weak electrolytestrong electrolytesemiconductorHence, the Correct Option is 3) i.e., Weak electrolyte
Weak electrolytes are those electrolytes that do not dissociate or ionized completely in their aqueous solution. These electrolytes have low electrical conductivity with a lesser extension of ionization. For example, CH3COOH, NH4OH, etc
In water substance that is partially ionized in solution is known as weak electrolyte. Since strong electrolyte completely ionized while weak electrolyte partially ionized.
Weak electrolyte examples: Acetic acid (CH3COOH): Acetic acid is the acid that is found in vinegar. It is an electrolyte that is extremely soluble in the water. But when it is dissolved in the water, most of its original molecule remains as it is, instead of being in the ion form. This original form is known as ethanoate. The acetic acid is dissolved in the water and ionises as ethanoate and the hydronium ion. Thus, this makes acetic acid a weak electrolyte.
CH3COOH + H2O ⇔ CH3COO -+ H3O +
Carbonic acid (CH2O3), Ammonia (NH3), and Phosphoric acid (H3PO4) act as weak electrolytes.
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in double replacement reactions, why will two metals not combine with each other when products are formed?
In double replacement reactions, the two metals will not combine with each other when products are formed because the atoms of metals contain less than half the full complement of electrons in their outermost shell.
What is Double replacement reaction?This is referred to as a type of reaction in which the positive and negative ions of two compounds exchange places to form two new products or substances.
The two metals will not combine with each other when products are formed because of their atoms having less than the required electrons which is needed to complement those in the outermost shell.
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Round 0.02056 to three significant figures. O 0.0205 O 0.0206 O 0.021 O 0.020
On rounding of the number 0.02056 to three significant figures we get 0.021.
The significant figures are the digits that are used to represent the accuracy of a particular number or value.
Rounding off is a procedure in which a complex value is made simple by keeping it close to the very next number which is more convenient to deal with.
In the given number 0.02056. We have to round of this number to 3 significant figures.
We can observe that the digit 6 is greater than 5 so we can add one to the successive digit, so the number will become 0.0206.
But it has to be noted that we have to round of the number to three significant figures.
So, again rounding off the number 6. So finally after rounding of two three significant figures are number becomes 0.021.
As we can see that this number contains three digits after the decimal so it has three significant figures.
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identify the compound that has hydrogen bonding. identify the compound that has hydrogen bonding. ch3ch3 hi h2 hf (ch3)3n
The chemical compound HF, or hydrogen fluoride, acts as both a hydrogen donor and acceptor during the process. It exhibits hydrogen bonding because the fluoride is linked to the hydrogen atom in this reaction. Option C is the correct option.
HF molecules are held together by a covalent bond or the strong hydrogen bonding between a hydrogen and a fluorine atom. Given that it contains a potent electronegative ion, fluorine can act as both a hydrogen acceptor and donor. This material exhibits hydrogen bonding as a result.
In chemistry, a hydrogen bond is a relatively strong attraction between an electronegative atom, which is generally the acceptor of the bond, and also an electronegative atom that is covalently bound to a higher electronegative donor atom or group. This attraction is termed to be electrostatic in general.
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In the reaction C2H6O, O2, CO2, and H2O What element is oxidized? What element is reduced? What molecule is oxidizing agent? What molecule is reducing agent?
In the reaction C2H6O, O2, CO2, and H2O this is an oxidation-reduction reaction. C2H6 is a reducing agent, and O2 is an oxidizing agent.
What does mean of oxidation and reduction?Oxidation:- Oxidation is a process which involves the addition of oxygen or any electronegative element or the removal of hydrogen or any electropositive element.
Oxidation is defined as the process in which an atom or ion loses one or more electrons.
Reduction:- Reduction is a process which involves the addition of hydrogen or any electropositive element or the removal of oxygen or any electronegative element.
Reduction is defined as the process in which an atom or ion gains one or more electrons.
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If you had not heated the sample long enough to remove all the water of hydration, how would your subsequent calculations have been affected?
If the sample is not heated long enough water of hydration remain in the sample which adds on to the molar mass of the sample thereby introducing errors in calculations.
What is molar mass?Molar mass of a compound or a molecule is defined as the mass of the elements which are present in it.The molar mass is considered to be a bulk quantity not a molecular quantity. It is often an average of the of the masses at many instances.
The molecular mass and formula mass are used as synonym for the molar mass.It does not depend on the amount of substance which is present in the sample.It has units of gram/mole.
Molar masses of an element are given as relative atomic masses while that of compounds is the sum of relative atomic masses which are present in the compound.
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in this experiment, two equivalents of benzaldehyde were used, and the desired product was dibenzylideneacetone. how can you use the attached proton nmr of the product to show that you did not isolate the product of a single aldol condensation (that is, benzylideneacetone).
Aldol condensation results from the reaction of two moles of benzaldehyde with one mole of acetone.
The preparation of benzylideneacetone from benzaldehyde and acetone proceeds by the procedure of Claisen-Schmidt reaction which is a condensation reaction between aromatic aldehydes or aldehyde with ketone in the presence of an alkali.
Aromatic aldehyde, in the presence of an alkali, undergoes a condensation reaction with an aldehyde or ketone containing alpha hydrogen atoms. This reaction is named as Claisen-Schmidt reaction. In the presence of sodium hydroxide, aldehydes can condense with another aldehyde or ketone by eliminating a water molecule. Thus, with one mole of acetone, moles of benzaldehyde condense to give Dibenzal acetone.
Hence, benzaldehyde with acetone with ketone forms aldol product.
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choose the correct orbital diagram for titanium.
Titanium's neutral atoms have the electronic configuration 1s²2s²2p⁶3s²3p⁶3d²4s². The orbital diagram for a neutral atom of titanium is attached below: the correct answer is the last option.
what is An electronic configuration?The electron configuration can explain how electrons will be arranged in an element's atom's energy levels. The number of electrons in a specific energy level is expressed in the electron configuration of an atom as a superscript of electron-containing subshells.
The formula 2n² determines the primary quantum number (n), which controls the maximum number of electrons that can fit into an electron shell. titanum have 5 orbital. The orbital diagram shown below
The titanium atom has an atomic number of 22 and an electronic configuration of1s²2s²2p⁶3s²3p⁶3d²4s².
your question seems incomplete because of missing the diagram but most probably your full question was attached below
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a constant current is passed through an electrolytic cell containing molten mgcl2 for 12.8 h. if 3.64 g of mg(s) is produced, what was magnitude of the current that was passed through the cell? the molar mass of mg is 24.305 g/mol.
A constant current is passed through an electrolytic cell containing molten MgCl₂ for 12.8 h. if 3.64 g of mg(s) is produced .The magnitude of the current that was passed through the cell is
given that :
T = 12.8 hr = 46080 sec
Mass = 3.64 g
molar mass = 24.305 g /mol
the moles = mass / molar mass
= 3.64 / 24.305
= 0.149 mol
moles = Q / ZF
where,
Q = charge
Z = no. of electrons
F = faraday constant = 96485 C
moles = Q / ZF
Q = 0.149 × 2 × 96485
Q = 28752.53 C
the current is given as :
Q = I T
I = Q / T
I = 28752.53 / 46080
I = 0.62 A
Thus, the current is 0.62 A.
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at this temperature, 0.800 mol h2 and 0.800 mol i2 were placed in a 1.00 l container to react. what concentration of hi is present at equilibrium?
0.800 mol of H2 .800 mol of I2 were added to a 1.00 L container to react at this temperature. The equilibrium constant Kc for this reaction is 53.3H2 + I2 > 2HI at a specific temperature.
What is specific temperature?
There are 0.800 mol of H2 at this temperature. A 1.00 L container held 0.800 mol H2 and 0.800 mol I2 for the reaction. HI focus is present when things are balanced. A. Instead of mol/L, concentrations are given in atmospheres. In a 1.00-L container, 0.100 mol H2 and 0.100 mol I2 are combined, and HI is produced in the process. 0.800 mol h2 and 0.800 mol i2 were placed in a 1.00 l container to react at this temperature. when the reaction's balanced equation.
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Round 0.02056 to three significant figures a)0.0205 b)0.0206 c)0.021 d)0.020
Answer:
The Round of given number to three significant figures will be 0.0206 option (b)
Explanation:
Rules for rounding to a
1, look at the second digit after the first non-zero digit if to three significant figures
0.0205|6
2, look at the next number
0.0205|6
3, if it's 5 or more, increase the previous digit by one
0.0206|6
4, if it's 4 or less, keep the previous digit the same
so, the final answer of given number 0.02056 after round off upto three significant figures will be 0 .0206
correct option is (b)
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In the coordination compound [Co(en)2CIz]CI, the charge on the Lewis acid is (ethylenediamine, en = H2NCH2CH2NH2) a. -2 b. -1 Oc +2 d.+3 e. +1
So, the charge on Lewis acid (Co) is +3 . So, correct answer is :-d). +3
As we know in a coordination compound metal atoms or ions are Lewis acid . So, here Cobalt is Lewis acid .Now , the charge of ethylenediamine (en) is 0 , the charge of Cl is -1 . Let the charge on Co be X . Then as overall compound is neutral . So,
1 × X + 2 × 0 + 3 × -1 = 0
X - 3 = 0
X = +3
So, the charge on Lewis acid (Co) is +3 . So, correct answer is : d). +3
A Lewis acid can be an atom, ion, or molecule having an uncompleted octet of electrons (e.g., BF3, AlF3). Lewis acids are a subclass of molecules whose core atoms can take electrons from more than eight valence shells (e.g., SiBr4, SiF4).
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give the total number of electron domains, the number of bonding and nonbonding domains, and the molecular geometry for pcl3.
PCL3 has four electron domains, three bonding domains, and one nonbonding domains and the molecular geometry is trigonal pyramidal.
What do you know about PCL3?Phosphorus trichloride is inorganic compound with the chemical formula of PCl₃. It is a colorless liquid when pure and is an important industrial chemical, used for the manufacture of other organophosphorus compounds. It is toxic and reacts with water to give hydrogen chloride.
In PCl3, there are 3 electron pairs that is 3 bond pairs and one lone pair of electrons. Molecular geometry of PCL3 is trigonal pyramidal, but the presence of a pair of electrons on phosphorus atom has an asymmetric charge distribution and makes its electron pair geometry tetrahedral.
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the equilibrium constant, , for the following reaction is 1.47 at 665 k. when a sufficiently large sample of is introduced into an evacuated vessel at 665 k, the equilibrium concentration of is found to be 1.14 m. calculate the concentration of in the equilibrium mixture.
The concentration of NH₃ in the equilibrium mixture is 0.21 M.
The reaction is given as :
2NH₃(g) ⇄ N₂(g) + 3H₂(g)
equilibrium concentration of H₂ = 1.14 M.
2NH₃(g) ⇄ N₂(g) + 3H₂(g)
initial conc x 0 0
at equ. (x-2y) M y M 3y M
The expression for the equilibrium constant is given as:
3y = 1.14 M
y = 0.38 M
Kc = y × (3y)³ / (x - 2y )²
1.47 = 0.38 × (3 ×0.38)³ / (x - 2×0.38 )²
x = 0.97
the concentration of NH₃ = (x-2y) M = 0.97 - 0.76
= 0.21 M
The question is incomplete , the complete question is :
The equilibrium constant, Kc, for the following reaction is 1.47 at 665 K. 2NH3(g) N2(g) 3H2(g) When a sufficiently large sample of NH3(g) is introduced into an evacuated vessel at 655 K, the equilibrium concentration of H2(g) is found to be 1.14 M. Calculate the concentration of NH3 in the equilibrium mixture. M.
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In the diagram, what is happening to the temperature at Point B?
A. The temperature is rising as the molecules break apart from each other
B. The temperature is rising as the substance melts
C. The temperature is not rising because the heat is being used to break the connections between the molecules
D. The temperature is dropping as the molecules break apart from each other
E. The temperature is not rising because the molecules are slowing down
In the diagram, an activity which is happening to the temperature at Point B is that: C. The temperature is not rising because the heat is being used to break the connections between the molecules.
What is matter?Matter can be defined as any physical object or body that has both mass and takes up space. This ultimately implies that, the mass of a physical object measures the amount of matter the object contains.
What is heat?In Science, heat is sometimes referred to as thermal energy and it can be defined as a form of energy that is transferred from a physical object (body) to another due to a difference in temperature.
By critically observing the diagram, we can reasonably infer and logically deduce that matter has dynamic states depending on the composition of its atoms and at point B the temperature remained constant (not rising) because the quantity of heat generated is used for breaking any form of connection between the molecules.
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Why might you want to heat a reaction? More than one answer may be correct. To increase the rate of the reaction. To evaporate the solvent more quickly To increase the solubility of the reagents. To overcome the activation energy for the reaction. .1 To decrease the rate of the desired reaction.
We might want to heat a reaction :To increase the rate of the reaction, to evaporate the solvent more quickly ,to increase the solubility of the reagents and to overcome the activation energy for the reaction.
The average reaction rate of the reactant molecules increases as the temperature rises. The number of molecules that are able to react quickly rises as more molecules move more quickly, hastening the creation of products.
For chemical processes to be scaled up safely and effectively, the heat of reaction, also known as reaction enthalpy, is a crucial element. The energy that is either released or absorbed when chemicals are changed in a chemical reaction is known as the heat of reaction. It explains how the energy content changes when reactants become products. The majority of reactions carried out in the chemical and pharmaceutical industries are exothermic, although a reaction can also be endothermic (heat absorption). One of the thermodynamic parameters utilized in chemical development, scale-up, and safety to scale processes from the lab scale to manufacturing is the heat of reaction, among others. The heat of reaction, also known as reaction enthalpy, is commonly given as either specific or molar enthalpy in KJ/Kg or KJ/L.
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What is the density of gold if 97.3 cm^3 has a mass of 1880 grams?
Answer:
Explanation:
the equation is d=m/v
convert cm to m
97.3*100=9730m^3
d=1880g/9730cm^3
d=0.19g/m^3
nickel metal is electroplated from a niso4 solution. a constant current of 8.06 amps is applied by an external power supply. how many hours will it take to deposit 135.3 g of ni
There are 23.1 hours taken to deposit.
Solution:
3600 Sec = 1hr
1 Sec = 3600
83500 = 83500 hr/3600 = 23.1 hr
Each bank has different rules, but you can expect most direct deposits to be in your bank account by midnight. This is because some financial institutions update accounts several hours after midnight. The bank must make the first $225 of the deposit available for cash withdrawal or check by the beginning.
The business day following the business day of the bank on which the deposit was made. Usually, the rest of the deposit will be available on his second business day. Pending deposits cannot be withdrawn. However, it will be credited to your account within 1-2 business days. To check the status of your deposit, choose the experience that best suits you below.
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waghorne, w.e.; rous, a.j. determination of the relative atomic masses of metals by liberation of molecular hydrogen. j. chem. ed. 2009, 86, 350-351.
By using hydrochloric acid to react with calcium, magnesium, and aluminum, and then measuring the amount of hydrogen gas that is released, determine the atomic masses of these three elements.
How is hydrogen gas volume measured?Given that one mole of dihydrogen (H2) weighs 2,0159 g/mo and that the experimental density of hydrogen is 0,0899 g/L at 0 °C and 0,0837 g/L at 20 °C, it is possible to compute the precise molar volume of hydrogen.
How do you figure out how much hydrogen gas STP produces?One mole of gas has a volume of 22.4 dm3 at standard pressure and temperature, or stp (0 °C, 101,500 N m-2). The students can anticipate a response of roughly 24 dm3 at ambient temperature and pressure, rtp. The volume at stp can be calculated using the equation P1V1/T1 = P2V2/T2 by more capable students.
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Which star type has a surface temperature of 4000 K and a luminosity 1000 times greater than the Sun? dwarf
The star type that has a surface temperature of 4000 K and a luminosity 1000 times greater than the Sun is a main sequence star, also known as a dwarf star.
Dwarf stars are the most common type of star in the universe, and they are characterized by a surface temperature of between 3000 K and 7000 K. These stars are relatively small and have a mass similar to that of the Sun, but they are much more luminous, with a luminosity that can be 1000 times greater than the Sun.
Dwarf stars are classified into different spectral types based on their surface temperature, with stars like the Sun being classified as G-type dwarf stars. A star with a surface temperature of 4000 K would be classified as a K-type dwarf star.
Dwarf stars are important because they are the primary source of energy for planetary systems, and they are also the primary source of heavy elements that are necessary for the formation of planets and life.
a. What is the electron-domain (charge-cloud) geometry of BrF5? Enter the electron-domain geometry of the molecule.
b. What is the molecular geometry of BrF5?
c. Ignoring lone-pair effects, what is the smallest bond angle in BrF5?
d. Which choice best describes the polarity of BrF5?
The molecule is polar and has polar bonds.
The molecule is nonpolar and has polar bonds.
The molecule is polar and has nonpolar bonds.
The molecule is nonpolar and has nonpolar bonds.
e. Of the molecules below, only ________ is polar.
H2
SiS2
CH4
AsH3
PF5
(a) Electron domain geometry - Octahedral.
(b) Molecular geometry - Square pyramidal.
(c) Smallest bond angle - 90°
(d) The polarity of BrF₅, best choice is: The molecule is polar and has polar bond.
(e) AsH₃ is polar molecule.
What is polar and non-polar molecule?A molecule's valence shell electrons are shown in a very simple manner via a Lewis structure. It serves as a visual representation of how the electrons surrounding certain molecules' atoms are positioned.
It demonstrates the bonds that exist between a molecule's atoms and its lone pairs of electrons. When used in conjunction with hybrid orbitals, Lewis structures can also be helpful in predicting molecular geometry.
(a) Electron domain geometry - Octahedral.
(b) Molecular geometry - Square pyramidal.
(c) Smallest bond angle - 90°
(d) The polarity of BrF₅, best choice is: The molecule is polar and has polar bond.
(e) AsH₃ is polar molecule.
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Problem 6.30 b Draw the mechanism for the following reaction. OH H,O HzN Get help answering Molecular Drawing questions: Your answer is incorrect Try again. Part A: Draw part 1 of the mechanism. Include charges and lone pairs on your mechanism. 5 Edit Get help answering Molecular Drawing questions_ Your answer is incorrect Try again. Part B: Draw part 2 of the mechanism: Include charges and lone pairs on your mechanism:
Ring expansion is the first reaction's mechanism. A primary oxonium ion is created when the hydroxyl group is protonated by sulfuric acid. the main ion of oxonium.
How are lone pairs identified?By deducting the number of valence electrons on bound atoms (Step 2) from the total number of valence electrons, one can determine the number of lone pairs on the central atom (Step 1). To determine the number of LPs, divide the number of VEs not in bonds (from Step 3) by two.
What do bond pairs and lone pairs refer to?Bond pairs are the shared pairs of electrons that exist between the bonded atoms. Not all valence electrons will necessarily participate in a bond. Lone pairs of electrons are the electron pairs that do not engage in bonding.
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exothermic reaction that has an overall increase in entropy is a) spontaneous only at high t b) spontaneous only at low t c) always spontaneous d) spontaneous in the reverse direction.
Exothermic reaction that has an overall increase in entropy is always spontaneous.
Exothermic reactions are defined as "reactions with a negative total standard enthalpy change ΔH⚬." Exothermic reactions typically produce heat.An exothermic reaction is one that releases energy in the form of light or heat. Thus, in an exothermic process, energy is transferred into the environment rather than taken from it, as in an endothermic reaction. The change in enthalpy ( ΔH) in an exothermic reaction is negative.
As a result, the net amount of energy required to start an exothermic reaction is less than the net amount of energy produced by the process. The net quantity of heat energy that passes through a calorimeter, an instrument used to quantify the heat emitted by a chemical reaction, is equal to the negative of the total energy change of the system.
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Answer:
Explanation: C)always spontaneous
Classify each molecule as polar or nonpolar. (a) BH3 (b) CHCl3 (c) C2H2 (d) NH3
Polar molecules - NH3 and CHCl3
Non polar molecules - BH3 and C2H2
What are polar and non polar molecules?A polar molecule is one that has one end that is slightly positive and the other end that is slightly negative. A polar molecule is a diatomic molecule with a polar covalent bond.
Non-polar molecules are ones that do not have charges at the end because electrons are finely distributed and symmetrically cancel out each other.
Why NH3 and CHCl3 are polar molecules?NH3- because one end has a positive charge and the other has a negative charge. NH3 is polar.
CHCl3- Because of its tetrahedral molecular shape and the difference in electronegativity of C, H, and CL, CHCl3 is polar.
Why BH3 and C2H2 are non polar molecules?BH3 - a nonpolar molecule. Because of the symmetry of the molecule, the dipole moments of each of the B-H bonds cancel out.
C2H2 - because the electronegativity difference between Carbon and Hydrogen is less than the minimum required.
Polar molecules - NH3 and CHCl3
Non polar molecules - BH3 and C2H2
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a mixture of 100 g of k2cr2o7 and 200 g of water is stirred at 60 oc until no more of this salt dissolves. the resulting solution is decanted (poured off) and cooled to 20 oc. what mass of k2cr2o7 crystallizes from the solution during the cooling?
A mixture of 100 g of K2Cr2O7 and 200 g of water is stirred at 60 OC until no more of this salt dissolves. 33% mass of K2Cr2O7 crystallizes from the solution during the cooling.
To solve this problem, you need to use the solubility curve for potassium dichromate (K2Cr2O7) in water. A solubility curve is a graph that shows the relationship between the temperature of a solution and the amount of a substance (in this case, potassium dichromate) that will dissolve in the solution. Since the mixture you have consists of 100 grams of potassium dichromate and 200 milliliters of water, you can use the solubility curve to determine how much potassium dichromate will dissolve in the mixture at 60 degrees Celsius.
At a temperature of 60 degrees Celsius, the solubility of potassium dichromate in water is approximately 150 grams per 100 milliliters of water. Since the mixture you have consists of 100 grams of potassium dichromate and 200 milliliters of water, you can use the solubility curve to determine how much potassium dichromate will dissolve in the mixture.
Since the volume of water in the mixture is 200 milliliters, this means that approximately 67% of the potassium dichromate in the mixture will dissolve at 60 degrees Celsius. The remaining 33% of the potassium dichromate will not dissolve in the mixture and will remain as a solid.
When the mixture is cooled to 20 degrees Celsius, the solubility of potassium dichromate in water decreases. This means that some of the potassium dichromate that was dissolved in the mixture at 60 degrees Celsius will crystallize out of the solution as the temperature decreases.
To determine the mass of potassium dichromate that crystallizes from the solution during the cooling, you can use the following equation:
Mass of potassium dichromate crystallized = (Mass of potassium dichromate in mixture - Mass of potassium dichromate dissolved at 60 degrees Celsius) x (1 - Solubility at 20 degrees Celsius / Solubility at 60 degrees Celsius)
Substituting in the values from the problem, we get:
Mass of potassium dichromate crystallized = (100 grams - (100 grams x 67%)) x (1 - (Solubility at 20 degrees Celsius / 150 grams)
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What is an Experimental Percentage Yield Explained.
The experimental percentage yield is the ratio of the actual yield of the product of a reaction to its theoretical yield multiplied by 100.
What is percentage yield?Percentage yield of a reaction is used to study the efficiency of a chemical reaction. It is the ratio of the actual yield to the theoretical yield multiplied by 100.
The actual yield of a reaction is the experimentally obtained value and it will be less than theoretical yield which is derived from the balanced chemical equation of the reaction.
For example if 5 g be the actual yield of the product in a reaction, but the theoretical or expected yield derived from the equation be 7 g.
then the percentage yield = 5 /7 × 100 = 71.4 %.
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