The mole fraction of glycerol in this solution is 3.58%.
d = 1.037 g/ml; density of the solution
M(HOCH₂CH(OH)CH₂OH) = 92.095 g/mol; molar mass of glycerol
m= 100 ml × 1.037 g/ml
m= 103.7 g; mass of 100 ml of the solution
m(HOCH₂CH(OH)CH₂OH) = 0.16 × 103.7 g
m(HOCH₂CH(OH)CH₂OH) = 16.592 g; mass of glycerol
n(HOCH₂CH(OH)CH₂OH) = 16.592 g ÷ 92.095 g/mol
n(HOCH₂CH(OH)CH₂OH) = 0.180 mol; amount of glycerol
m(water) = 103.7 g - 16.592 g
m(water) = 87.108 g
n(water) = 87.108 g ÷ 18.0153 g/mol
n(water) = 4.835 mol; amount of water
mole fraction = 0.180 mol ÷ (0.180 mol + 4.835 mol)
mole fraction = 0.0358 = 3.58%
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What is the net force and direction of the block?
Answer:
We know that the forces are added if they are in the same direction and they are subtracted if they are in opposite directions. So, the net force = 10 N (North) + 10 N (North) = 20 N (North) and 8 N (West) - 8 N (East) = 0. Therefore the net force on the block is 20 N in the North direction.
Janice measured the mass and the volume of an object. She then determined the density of the object by dividing the object’s mass by its volume (D = ).
Which value would most likely represent the density of the object?
–1 g/cm3
4 m/s
–3 m/s
6 g/cm
The value which is most likely represent the density of the object is option d. 1 g/cm³
Density is described as the ratio of mass to extent of an item. Density is immediately proportional to mass and inversely proportional to quantity, this is, density increases with boom in mass and reduces with growth quantity.
The unit of density is gram in line with cubic centimeter (g/cm³).
Density = [tex]\frac{mass}{volume}[/tex] = [tex]\frac{g}{cm³}[/tex]
unit of mass can be gram, kilogram etc.
unit of volume is, metre³ etc.
The key distinction among density and weight is that weight is a degree of the amount of depend in an object, whereas density measures the quantity of depend in a unit volume.
Density is an crucial concept because it permits us to decide what substances will flow and what materials will sink when placed in a liquid. commonly, substances waft so long as their density is less than the density of the liquid.
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Write an equation for the reaction that occurs when a few drops of hydrochloric acid are added to the buffer. (nac2h3co2) of a 0.150 m acetic acid (h c2h3co2, ka = 1.8 10-5)
The equation for the reaction occurs when a few drops of hydrochloric acid are added to the buffer is:
[tex]NaOH[/tex] + [tex]Na[/tex][tex]C_{2[/tex][tex]H_{3}[/tex][tex]O_{2}[/tex] → [tex]HC_{2} H_{3} O_{2}[/tex] + [tex]Na_{2}O[/tex]
The NH3 uses the extra H+ ions that were added to the system by the addition of HCl (strong acid) to produce [tex]NH_{4}[/tex]+. Since all extra H+ ions have been captured and changed. The pH of the system hasn't altered significantly; [tex]NH_{4}[/tex]+ is a weaker acid.
When a strong acid (H3O+) is given to the buffer solution, the conjugate base in the buffer eats the hydronium ion, converting it into the water and the conjugate base's weak acid. As a result, there are more weak acids present and fewer conjugate bases as well.
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Does a reaction occur when aqueous solutions of lead(ii) nitrate and aluminum sulfate are combined?
Yes, the reaction will occur .
Al2(SO4)3+3Pb(No3)2 →3PbSO4+2Al(NO3)3.
How can you tell whether a chemical equation has no reaction?We use the (aq) mark to indicate a substance dissolves if it is soluble. We employ the (s) label with a substance and anticipate that it will precipitate out of solution if it is not soluble. There won't be any expected reaction if everything is solvable.
When aqueous solution of lead (II) nitrate and aluminium chloride are combined, lead(II) chloride will precipitate.
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Two different compounds containing osmium and oxygen have the following mass of oxygen per grams of osmium 0.168 & 0.3369g. Show that these amounts are constituent with the law of multiple proportions
Yes, given compound's amount are constituent with the law of multiple proportions .
Briefing :mass of oxygen = 0.168g
mass of osmium = 0.3369g
So,
the proportion = (0.3369 / 0.168)
the proportion = 2.00
That is, multiple proportions.
The ratio of the masses of O combined with 1 g of Os in the compound must be a small whole number in order for the law of multiple proportions to hold.
Note that there are only two elements being discussed in the problem. Different compounds are being created by the two elements combining in various ways.
What is law multiple proportions?The law of multiple proportions states that when two elements combine to form more than one compound, the combined weights of each element are in a ratio of small whole numbers.
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Ali notices that the electrical cord on his microscope is frayed near the plug. He takes the microscope to his teacher and asks for permission to use another one.
Yes, Ali did the correct job by taking the microscope to his teacher and asks for permission to use another one.
We should never use equipment with frayed or damaged electrical cord and should inform our teacher or lab assistant immediately. This situation comes under measure lab safety rules.These and all other electrical equipment used in lab settings provide a risk of electric shock injuries, fires from faulty installations or maintenance, and fires from sparks acting as an ignition source for flammable or combustible chemicals.Discover where your electrical panels and shut-off switches are so you can immediately turn off the power in an emergency. Always provide at least three feet of space around electrical panels so that people can easily access them.Working with damaged equipment or electric cord can lead to big accidents in the labs.It shows Ali followed lab safety rule properly.
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Calculate the fluoride ion concentration and ph of a solution containing 0.10 mol of hcl and 0.20 mol of hf in 1 l of solution. ka for hf equals 6.8 * 10-4.
The fluoride ion concentration is 1.4 x [tex]10^-^3[/tex], and the solution's pH is 1.
The main species in solution are [tex]H^+[/tex], [tex]Cl^-[/tex], HF, and the solvent [tex]H_2O[/tex] since HCl is a strong acid and HF is a weak acid. The question requests the fluoride ion concentration [[tex]F^-[/tex]], which are created when HF is ionized. Consequently, the crucial equation is:
[tex]HF (aq) \leftrightarrow H^+ (aq) + F^- (aq)[/tex]
Equilibrium 0.20 – x mol 0.10 + x mol 0 + x mol
Equilibrium constant = 6.8 x [tex]10^-^4[/tex]
[tex]Ka = \frac{[H^+][F^-]}{[HF]}[/tex]
6.8 x [tex]10^-^4[/tex] = [0.10] [x] / [0.20]
x = (0.20 / 0.10) x 6.8 x [tex]10^-^4[/tex]
x = 1.4 x [tex]10^-^3[/tex]
Fluoride ion concentration, [[tex]F^-[/tex]] = 1.4 x [tex]10^-^3[/tex]
[[tex]H^+[/tex]] = (0.10 +x) = 0.10M
Thus, pH = 1.00 since it is entirely from HCl and HF has negligible contribution.
Result:
The fluoride ion concentration is 1.4 x [tex]10^-^3[/tex] and the pH of the solution is 1.00.
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What is the charge on the central metal atom, the coordination number, and the overall charge for the complex ion in the compound, nh4[fe(nh3)2(cn)4]?
The charge on the central metal atom is +3.
The coordination number is 6.
The overall charge for the complex ion in the compound is -1.
Iron is the central atom in the complex ion.
The overall charge for the complex ion in the compound is -1, because it is connected to ammonium cation.
Ammonium cation (NH₄⁺) has charge +1.
The compound must have the neutral charge.
Iron is connected with six ligands.
Ligand NH₃ has no charge, while the ligand CN has charge -1.
Overall charge for the complex ion = z(Fe) + 4 × (-1) = -1
z(Fe) = +3; the charge on the central metal atom.
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I REALLY NEED HELP WITH THIS ASSIGNMENT!
The maximum number of significant figure of the reading obtained in the thermometer is 3.
What is significant figure?Significant figures are used to establish the number which is presented in the form of digits.
A significant figure is a figure or a digit that contributes to how accurately something can be measured.
For the given thermometer, the reading of the digits is in 2 significant figure and the calibration is in one digit.
combining the 2 digits of reading and 1 digit calibration gives 3 significant figures.
Thus, the maximum number of significant figure of the reading obtained based on the calibration of the thermometer is 3.
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When sodium oxide is added dropwise to a buffered solution the_____ component of the buffer consumes the added hydroxide ion
When sodium oxide is added dropwise to a buffered solution the weak acid component of the buffer consumes the added hydroxide ion.
What is a buffer?A weak acid and its conjugate base must be present in a buffer. A solution containing these two components can be made in several ways: buffers can be made from weak acids or bases and their salts.
When a buffer is present in the solution, the hydroxide (OH-) ions react with the weak acid in the buffer solution rather than with water, resulting in water and A- ions.
Thus, the weak acid of the buffer absorbs the excess hydroxide ions from the solution.
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Copper has two isotopes: Cu-63, and Cu-65. The percent abundance of Cu-63 is
69.1%. What is the average atomic mass of copper? Assume the masses listed
are 63.000 and 65.000.
Answer:
63.6 g/mol
Explanation:
If the percent abundance of Cu-63 is 69.1%, then Cu-65 is 30.1% since
100%-69.1%= 30.1%
To find the average atomic mass, multiiply the percentage with the corresponding mass then add the answers together.
(63 x 69.1%) + (65 x 30.1%) = average atomic mass
(63 x .691) + (65 x .301) = 43.533 + 20.085 = 63.618 g/mol = 63.6 g/mol
A+14-karat+gold+ring+contains+58.3%+gold+and+weighs+12.41+g.+if+gold+sells+for+$308.00/ounce,+what+is+the+value+of+the+gold+in+the+ring?
The value of the gold in the ring is $78.50.
m(ring) = 12.41 g; mass of the ring
m(Au) = 0.583 × 12.41 g
m(Au) = 7.235 g; the mass of gold in the ring
m(Au) = 7.235 g × 0.0352 g/ounce
m(Au) = 0.255 ounce
value = 0.255 ounce × $308.00/ounce
value = $78.50; the value of the gold in the ring
Karat is a measure of the purity of gold. A gold karat is 1/24 part of the whole.
Gold is very ductile and can be drawn into a monoatomic wire or used in the production of rings.
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9)
Solve the question above:
A car with a 14-gallon gas tank gets 22 mpg gas mileage. How far can the car travel on a full tank of gas?
distance traveled on a full tank = ? miles
A car with a 14 gallon gas tank get 22 mpg gas mileage. The distance traveled by a car on full tank is 308 miles.
capacity of car tank = 14 gallon
mileage of car = 22 mpg ( miles per gallon )
distance traveled on a full tank = ?
to find out the distance traveled by a car on full tank of gas,
distance traveled on full tank = capacity of car tank × mile per gallon
= 14 gallon × 22 miles / gallon
= 308 miles.
Thus , A car with 14 gallon gas tank get 22 mpg gas mileage. the distance traveled by a car on a full tank of gas is 308 miles.
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You poured out a little (or a lot) too much of a chemical solution. it is ok to pour it back into the bottle.
a) true
b) false
(b) false
It is not ok to pour it back in the bottle
Once a chemical is taken outside its bottle or container , it reacts with various gases present in the natural environment and also with those chemical which are being released in that laboratory.This will become a source of possible contamination for the entire contents of the stock bottle.The disposal of entire chemicals should be done as per instructed on the reagent bottle to prevent any dangerYou should never put the used spatula inside the reagent bottle.Do not put the excess chemicals inside the sink also , dispose it as it was instructed on the reagent bottle.To know more about chemical safety please refer:
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Please help me with questions 5 and 6
Explanation:
5) Uranium-234
Symbol- 234U
Names - uranium-234, U-234, Uranium II ( hist )
Protons (Z) - 92
Neutrons (N) - 142
Uranium-235
Symbol - 235U
Names - uranium-235, U-235
Protons (Z) - 92
Neutrons (N)- 143
Uranium-238
Symbol - 238U
Names - uranium-238, U-238
Protons (Z) - 92
Neutrons (N) - 146
What is the maximum length of a stem used for pendant lighting before bracing is required?
With no additional bracing needed, the maximum length of the stem utilized for pendant lightning is 12 in. (300 mm) or less. Lateral braces or an explosive flexible coupling must be utilized within 12 inches of the lightning fixture if the length is greater than 12 inches.
If you're planning on installing pendant lighting in your home, you'll need to be aware of the maximum length of the stem that can be used. According to the National Electric Code, the maximum length of the stem for pendant lighting is 12 inches (300 mm) or less. If the length of the stem is greater than 12 inches, you'll need to use lateral braces or an explosive flexible coupling within 12 inches of the lightning fixture. This will help to ensure the safety of your home and prevent any damage from occurring.
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What are anisotropic azobenzene materials? how is the structure of the compounds related to this phenomenon?
Anisotropic azobenzene materials are photoresponsive materials, very important in photochemistry.
The π-conjugated system and ring-substitution in azobenzene gives specific absorption in the UV-visible range of the spectrum.
Anisotropy is the property of a material which allows it to assume different properties in different directions.
Azobenzene is an aromatic molecule where two phenyl rings are connected with azo bond (–N=N–); see the picture below.
Azobenzene has the mesogenic property.
Anisotropic azobenzene materials have photoresponsive properties such as birefringence, phase transition, photoinduced colloidal deformation, surface-relief-gratings, bending, spontaneous surface pattern and dichroism.
The spectra of the cis- and trans-azobenzenes are distinct but overlapping.
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When a carbonate reacts with an acid it produces carbon dioxide, a salt, and what other product? Give the name, not the formula
A salt, water, and carbon dioxide are produced when acids react with carbonates, such as calcium carbonate (found in chalk, limestone, and marble). Fizzing is the result of the reaction's bubbling, which is caused by the carbon dioxide.
What happen when a carbonate reacts with an acid ?Salt, carbon dioxide, and water are produced when an acid combines with metal carbonate.
An illustration of this reaction is the formation of sodium chloride, carbon dioxide, and water when diluted hydrochloric acid combines with sodium carbonate.
2NaCl (aq) + CO2 (g) + H2O = Na2CO3(s) + 2HCl (aq) (l)
Because the acid is neutralised in these reactions, they are known as neutralisation reactions. In other words, the pH of the mixture approaches 7, or the acid and base (carbonate) are neutralised.
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Two difference between red blood cells and white blood cells:
Red blood cells
[•] More in numbers.
[•] No antibodies present in these cells.
White blood cells
[•] Less in numbers
[•] Antibodies are present in these cells.
A solution of cacl2 in water forms a mixture that is 28.0alcium chloride by mass. if the total mass of the mixture is 663.2 g, what masses of cacl2 and water were used?
Mass of CaCl2 = 663.2 g x 28% = 185.696g
So, Mass of water = Total mass - Mass of CaCl2 = 663.2 g - 185.696 g
⇒ Mass of water = 477.504g
What is Mass?Mass is a physical body's total amount of matter. It also serves as a gauge for the body's inertia, or resistance to acceleration (change in velocity) in the presence of a net force. The strength of an object's gravitational pull to other bodies is also influenced by its mass.The kilogram is the primary mass unit in the SI (kg).While weight has to do with how strongly a gravitational field is drawing matter in, mass is the quantity of matter. As a result, while the weight will fluctuate depending on the quantity of mass and how far away the body is from the center of gravity, the mass is a more or less absolute dimension.To learn more about Mass, refer to:
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3AgBr+GaPO4→Ag3PO4 +GaBr3
43g 54g 25g ?
What is the mass of GaBr,?
Is the reaction above a physical or chemical change?
How do you know?
A student is trying to identify an unknown mineral sample. The sample has a mass of 150 g and displaces 30 mL of water. Which mineral does the student have
please helpp
151 grams of SO2 is equal to how meany moles
Answer:
151 g SO₂ × [1 mol SO₂/64.06 g SO₂] = 2.36 mol SO₂
Explanation:
For the amino acid alanine, the major species in solution at ph 7 is the zwitterionic form, which has a negatively charged carboxylic acid group and a positively charged amino group. There is a less common neutral form in which neither group is charged. The carboxylic acid group of alanine has a pka of 3. The amino group of alanine has a pka of 8. Estimate the ratio of the concentration of the neutral amino acid species to the zwitterionic species at ph 7.
The ratio between the neutral and the zwitterionic form of alanine at pH 7 is 1:100000.
Since the carboxylic group has a pKa of 3, that means that at pH 3 the ratio between its protonated and deprotonated (charged) form is 1:1. The difference between pH 7 and pH 3 is 7 - 3 = 4, which means that (because pH is a negative logarithm), pH 7 is 10000 times more basic than pH 3. This implies that the ratio between the protonated and the deprotonated form of the carboxylic group is 1:10000.
A similar calculation can be applied to the amino group. 8 - 7 = 1, so at pH 7, the ratio between its protonated (charged) and deprotonated form will be 10:1.
We then multiply these two ratios to get a ratio of neutral:zwitterionic = 1:100000.
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Why don’t hydrogen ions appear in equation for half reaction occurring in basic solution
In a basic solution, the hydrogen ions do not appear in equation for half reaction.
What is a redox reaction?A redox reaction is one that involves the loss or gain of electrons. The electrons that are lost in one half equations are gained in the other half equation hence the process is synchronous. The electrons do not disappear in the process.
It is usual in some cases to use hydrogen or hydroxide ions to balance the atoms in the half equations. This occurs when the reaction is taking place in an acidic or a basic solution.
When the reaction takes place in a basic solution, there are no hydrogen ions present but only the hydroxide ions are present. Thus in a basic solution, the hydrogen ions do not appear in equation for half reaction.
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Calculate the volume in milliliters of a 0.875 m sodium sulfate solution containing 8.90 g of sodium sulfate?
The volume of the solution in milliliters is 60 mL.
Mass of sodium sulfate = 8.90 g
Molarity of solution of sodium sulfate = 0.875 M
Number of moles sodium sulfate is,
[tex]Number \: of \: moles = \frac{ Mass}{ Molar \: mass}[/tex]
[tex]n = \frac{m}{ M}[/tex]
[tex] = \frac{8.90}{142} [/tex]
= 0.06 moles
There are 0.06 moles of sodium sulfate.
The volume of the solution is,
[tex]Molarity = \frac{Number \: of \: moles \: of \: sodium \: sulphate}{ Volume \: of \: the \: solution }[/tex]
[tex]Volume \: of \: the \: solution = \frac{ Number \: of \: moles \: of \: sodium \: sulphate }{Molarity}[/tex]
[tex] = \frac{0.06} {0.875}[/tex]
= 0.06 L
The volume of the solution is 0.06 L.
The volume of the solution is milliliters is,
1 L = 1000 ml
0.06 L = 0.06 × 1000
= 60 mL.
Therefore, the volume of the solution in milliliters is 60 mL.
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How many atoms of carbon are present in 8.06 grams of carbon tetrabromide ? atoms of carbon .
1.463×10²² atoms of carbon are present in carbon tetrabromide.
m(CBr₄) = 8.06 g; mass of carbon tetrabromide
M(CBr₄) = 331.63 g/mol; molar mass of carbon tetrabromide
n(CBr₄) = m(CBr₄) ÷ M(CBr₄)
n(CBr₄) = 8.06 g ÷ 331.63 g/mol
n(CBr₄) = 0.0243 mol; amount of carbon tetrabromide
There is one carbon atom in one molecule of carbon tetrabromide: n(CBr₄) : n(C) = 1 : 1
n(C) = 0.0243 mol; amount of carbon atom
N(C) = n(C) × Na.
N(C) = 0.0243 mol × 6.022·10²³ 1/mol.
N(C) = 1.463×10²² atoms of carbon in carbon tetrabromide
Na - Avogadro constant or Avogadro number.
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What+is+the+major+disadvantage+of+using+concentrated+sulfuric+acid+rather+than+85%+phosphoric+acid+for+the+dehydration+of+alcohols?
The major disadvantage of using concentrated sulfuric acid rather than 85% phosphoric acid for the dehydration of alcohols is that concentrated sulfuric acid produces messy results.
Concentrated sulfuric acid or concentrated phosphoric(V) acid (H₃PO₄) are used in alcohol dehydration.
Concentrated sulfuric acid eliminates a water molecule from the organic molecule in a dehydration reaction.
Sulfuric acid (H₂SO₄) is a strong acid and a strong oxidizing agent.
It oxidizes the alcohols to carbon dioxide, while it is reduced to sulfur dioxide. Reaction is very exothermic, release a lot of energy.
Sulfuric acid is strong diprotic acid. It dissociates on hydrogen cations (H⁺) and sulfate anion (SO₄²⁻).
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An atom in its ground state contains 18 electrons. how many of these are in orbitals with ml = 0?
There are 6 electrons present in the orbital containing (ml=0).
Let the element be X. Now its electronic configuration will be
For 's' orbital the value of l = 0
X(18) = 1s^2, 2s^2, 2p^6, 3s^2, 3p^6
With this electronic configuration, three sublevels are present for the 's' orbital which are 1s^2, 2s^2, and 3s^2 respectively.
Now, let's calculate the electrons in the 's' orbital with l = 0
1s^2, 2s^2, 3s^2 = 2 + 2 + 2
1s^2, 2s^2, 3s^2 = 6
Thus, an atom containing 18 electrons in its ground state has 6 electrons.
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The half-life of nickel-65 is 2.50 days. how much of a 100.-g sample remains after 7.50 days?
12.5g of a 100.-g sample remains after 7.50 days.
What is half-life?Half-life is the amount of time required for a substance's radioactivity to decrease to half its initial value, whereas mean life is the average lifetime of all the nuclei of a specific unstable atomic species.
Knowing about half-life is helpful for calculating steady-state concentrations and excretion rates for each particular drug.
Despite the fact that individual medications' half-lives vary, they always adhere to the same principle: 50% of the initial drug dose leaves the body after one half-life.
The half-life of xenon-124, or the typical amount of time needed for a collection of xenon-124 atoms to decay by half, is about 18 sextillion years (1.8 x 1022 years), or roughly 1 trillion times the universe's present age.
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