The number of moles of KBr present in 150 mL of a 0.122 M solution is 0.0183mol.
How to calculate number of moles?The number of moles in a solution can be calculated by multiplying the molarity of the solution by the volume as follows:
no of moles = molarity × volume
Molarity is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution. It is the most common way to express the concentration of a solution.
According to this question, there are 150 mL of a 0.122 M pottasium bromide (KBr) solution, the number of moles in this solution can be calculated as follows;
no of moles = 150mL/1000 × 0.122M
no of moles = 0.0183mol
Therefore, the number of moles of KBr present in 150 mL of a 0.122 M solution is 0.0183moles.
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Could use some help, thanks. Complete each row of the table below by filling in the missing prefix or missing exponent.
Answer:
if eel u gngg ferr
Explanation:
asdads
What is the formula for calculating the density of an object?
(A) mass * volume
(B) mass/area
(C) mass/volume
(D) weight/mass
Answer:
it is option c
Explanation:
mass/volume
What did Henry Moseley change about Mendeleev's Periodic table?
O He ordered the elements by atomic mass.
O He ordered elements with similar properties into columns.
O He ordered elements with similar properties into rows
O He filled in blanks by discovering new elements.
Answer: A. He Ordered them by atomic mass.
Explanation:
What is the molarity of a solution containing 4.2 mol of NaCl and a volume of 2.3 L?
The molarity of a solution containing 4.2 mol of NaCl and a volume of 2.3 L is 1.9 M
The molarity is the number of moles of solute per litre of solution.
n=4.2
V=2.3 L
M=n/V
M=4.2/2.3
[tex]M=1.82[/tex]
Molarity is ≅1.9 M
Molarity or molar concentration is the number of moles of solute per liter of solution.Molar concentration can be used to convert between the mass or moles of solute and the volume of the solution.Molarity is represented by M, which is termed as molar. One molar is the molarity of a solution where one gram of solute is dissolved in a liter of solution. Since the solvent and solute combine to create a solution in a solution, the total volume of the solution is measured.To learn more about molarity visit:
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Calculate the mass, in grams, of 952 atoms of lithium, Li (1 mol of Li has a mass of 6.94 g).
The atomic number of lithium is 3. 1 mole of li has a mass of 6.94 g.
What is mass?
Mass of the object is defined as anything which occupies space. The atomic number of lithium is 3. 1 mole of lithium has a mass of 6.94 g.
1 mole of atom contains= 6.022 * 10 ^ 23 grams.
952 atom = x
x= 952 * 6.022 * 10^ 23 grams.
x= 5732.94 * 10 ^ 23 grams of lithium
.
Therefore, The atomic number of lithium is 3. 1 mole of li has a mass of 6.94 g.
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What types of clothes should we wear in kitchen cotton or silk ?why?
Answer:
I think cotton
Explanation:
Because in the kitchen ,there is heat that makes us sweat as cotton is a good absorber of water, it will keep us cool in hot atmosphere of the kitchen.
Sorry but please recheck it again this is my analysis
Sodium is a reactive, alkali metal. A neutral sodium atom consists of 11 protons, 11 electrons and 12 neutrons. It is a soft metal and metallic silver in color. Sodium plays an important role in the functioning of the human nervous system.
Which of the following images represents the atomic structure of a neutral sodium atom?
W.
X.
Y.
Z.
A.
W
B.
X
C.
Z
D.
Y
Sodium is a reactive, alkali metal. A neutral sodium atom consists of 11 protons, 11 electrons, and 12 neutrons. the atomic structure of a neutral sodium atom is represented by Y. Option D
What is atomic structure?Generally, Atomic structure is the structure of an atom, which consists of a nucleus (the center) and protons (which are positively charged), and neutrons (which are neutral).
This structure is referred to as the structure of an atom. Electrons are negatively charged particles that orbit the nucleus, which is located at the center of the atom.
In conclusion, Alkali sodium is reactive. Sodium has 11 protons, 11 electrons, and 12 neutrons. Neutral sodium's atomic structure is Y.
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Which part(s) of the molecule can form a hydrophobic interaction with a suitable partner? Check all that appluy:
In the given diagram four number means C=O
Hydrophobic interactions describe the relations between water and hydrophobes and hydrophobes are nonpolar molecules and usually have a long chain of carbons that do not interact with water molecules and the mixing of fat and water is a good example of this particular interaction the tendency of nonpolar groups or molecules to aggregate in water solution in that given image amino acid are given and in that amino acid the NH₃⁺ are in four number and water are didn't attached to NH₃⁺ ion and attached to C=O
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A drinking glass has a mass of 268.5 g. A 162 mL sample of milk is added to the glass. The mass of the glass containing the milk is found to be 436.2 g. What is the density of the milk?
The density of milk is equal to 1.04g/mL when its volume is 162 mL and its actual mass is 167.7 g.
What is Density?Density may be defined as a type of physical property that significantly deals with the description of how much space an object or substance takes up with respect to the amount of matter in that object or substance.
In a more simple sense, it is characterized as the measurement of quantity or mass per unit of volume in a particular substance.
According to the question,
The actual mass of milk = 436.28g - 268.58g = 167.7 g.
The volume of milk = 162 mL.
The formula for calculating the density is as follows:
Density = Mass/Volume.= 167.7 g/162 mL= 1.04g/mL.
Therefore, the density of milk is equal to 1.04g/mL when its volume is 162 mL and its actual mass is 167.7 g.
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a mixture contains salt, zinc powder and iron filings. salt is soluble in water while both zinc and iron will dissolve by reacting in hydrochloride acid. describe how you would separate the three components
Answer:
ooooookkkkkkllllloooooooogggggo
Which element has the largest ionization energy
Answer:
Explanation:
The answer is Xe.
1200cm per hour_______= feet per minute
Dimensional analysis
Answer: 0.656168 Feet per minute
Explanation:
0.656168 feet per minute
Explanation:The formula is:
for an approximate result, divide the speed value by 1829
True or false The density of a subsidence is always the same
0.4g divalent metal (eq.wt=20) is dissolved in 50cc of 0.64N HCL solution.If further 109.2 cc of NaOH is required to neutralize the resultant solution determine the strength of solution NaOH in g/l ?
An atomic mass is the mass of a chemical element's single atom. It involves the masses of the three atomic subatomic particles: protons, neutrons and electrons.
Volume of Naoh(V1)= 30cc
Normality of Naoh(N1)= 1N
Volume of excess Hcl(V2) = ??
Normality of Hcl(N2) = molarity × basicity
= 2×2 = 4 × 1.01 = 4.04N
Using,
V1N1 = V2N2
30×1 = V2 × 4.04
I.e. V2 = 7.42cc
Volume of excess acid = 7.42 cc
Volume of Hcl neutralized by metal= 100 - 7.42
= 92.575 cc
Therefore, gm.eqv of Hcl = gm.eqv of metal
(92.575/1000) × 4.04 = 4/E
I.e E = 10.09
Atomic mass= E × basicity
= 10.09 × 2
= 20.18amu ans
The atomic mass is 20.18 amu
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What is the tendency of a solute to change the melting point of a solid called?
A. Freezing point depression
B. Evaporation point change
C. Phase change depression
D. Boiling point elevation
Answer: Boiling point elevation
Explanation:
Boiling Point Elevation is the property of a solute that allows it to modify the boiling point of a solid. The boiling point of a solution that contains a non-volatile solute becomes greater than the boiling point of the pure solvent (without any solute). As the solute concentration increases in a solution, there is an increment in the boiling point as well hence called the boiling point elevation.
Answer: A. Freezing point depression
Explanation:
Given the densities of the liquids and solids, label the picture of the test tube with the appropriate position of each substance. Assume the liquids do not mix.
The arrangement of the objects according to density is;
Solids;
Cork
Ice
Silver ring
Gold ring
Liquids
Gasoline
Seawater
Mercury
What is density?The term density is used to describe the value that is obtained as the ratio between the mass and the volume of an object. When we have a mixture of objects, the objects would be separated based on the ones that are denser. We know that the denser liquids would always be found towards the bottom of the vessel that contains the mixture of substances.
Similarly, the solids that are more dense would always tend to sink inside the mixture while the ones that are less dense are closer to the surface.
Now let us arrange the substances according to the densities of each.
Solids;
Cork
Ice
Silver ring
Gold ring
Liquids
Gasoline
Seawater
Mercury
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Scientific equation of how many gallons is in 1 liter?
Answer:
1 liter = 0.264172 us gallon
Explanation:
Classify the following materials as: pure substance (element or compound) or mixture (heterogeneous or homogeneous) NO. MATERIALS 1. ALUMINUM FOIL 2. AIR 3. SOIL 4. WATER 5. BRONZE 6. ACETIC ACID 7. PENCIL LEAD 8. BLOOD 9. IRON FILINGS 10. GASOLINE Pure Substance or Mixture? Element or Compound Homogeneous or Heterogeneous
A sample of matter with both a definite and unchanging composition and specific chemical properties is referred to as a pure material.
A mixture is a substance comprised of two or more dissimilar chemicals that are not chemically linked.
Classify the following materials as: pure substance (element or compound) or mixture (heterogeneous or homogeneous) .
Materials
Aluminum Foil - Homogeneous MixtureAir - Heterogeneous MixtureSoil - Heterogeneous MixtureWATER - CompoundBRONZE - Homogeneous MixtureACETIC ACID - Homogeneous MixturePENCIL LEAD - ElementBLOOD - Heterogeneous MixtureIRON FILINGS - ElementGASOLINE - Homogeneous MixturePure substances and mixtures are the two broad categories into which matter can be divided. A sort of matter known as a pure substance has qualities and a steady composition throughout the sample. Physically combining two or more elements and/or compounds results in a mixture. The two types of mixtures are homogeneous and heterogeneous. Pure substances include both elements and compounds. Substances made up of multiple atom types are known as compounds. The simplest compounds are called elements because they only contain one kind of atom.
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how many moles of co2 is produced by the complete combustion of 86.2
grams of Sucrose in the presence of excess oxygen
The number of moles of CO₂ produced by the complete combustion of 86.2 g of sucrose, C₁₂H₂₂O₁₁ is 3.024 moles
We'll begin by obtaining the mole of 86.2 g of sucrose, C₁₂H₂₂O₁₁. This can be obtained as follow
Mass of C₁₂H₂₂O₁₁ = 86.2 gMolar mass of C₁₂H₂₂O₁₁ = 342 g/molMole of C₁₂H₂₂O₁₁ =?Mole = mass / molar mass
Mole of C₁₂H₂₂O₁₁ = 86.2 / 342
Mole of C₁₂H₂₂O₁₁ = 0.252 mole
How to determine the mole of CO₂ producedC₁₂H₂₂O₁₁ + 12O₂ -> 12CO₂ + 11H₂O
From the balanced equation above,
1 mole of C₁₂H₂₂O₁₁ reacted to produce 12 moles of CO₂.
Therefore,
0.252 mole of C₁₂H₂₂O₁₁ will react to produce = 0.252 × 12 = 3.024 moles of CO₂.
Thus, 3.024 moles of CO₂ were produced from the reaction
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A solution is made by dissolving 38.750 g of sample of an unknown, non-electrolyte compound in water. The mass of the solution is exactly 500.0 g. The boiling point of this solution is 100.220 °C.
What is the molecular weight of the unknown compound?
The molecular weight of the unknown compound will come as 0.42 g/mol. It can be calculated as follows:
Given,
mass of sample (solute) (wb) = 38.750g
mass of solution = 500 = mass solute + mass solvent
Here solute (b) unknown non electrolyte compound
solvent (a) is water
Molecular mass of unknown compound (mb)
= mol solute/Kg solvent (nb /wa)
Boiling point=
ΔT = K×mb
= 100.220°C×
≅ 373.22 K
Since
K water = 1.86 K.Kg/mol
Mb = ? (Mol wt ) (wb/nb)
Mb = ΔT / K
Mb = (373.22 K) / (1.86 K.Kg/mol)
Mb = 200.656 mol/Kg
Mass solvent = 500.0 g - 38.750 g
= 461.25 g
= 0.461 Kg
No of moles of solute=
nb = (200.656 mol/ Kg)×(0.461 Kg)
= 92.2 mol solute
Molecular weight
Mb = (38.750 g)/(92.2mol)
= 0.42 g/ mol
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(a) Experimental results describing a protein's amino acid composition are useful for estimating the molecular weight (MW) of the entire protein. A quantitative amino acid analysis reveals that bovine cytochrome c contains 2% cysteine (r 121 ) by weight. Calculate the approximate molecular weight of bovine cytochrome c if there are 2 cysteine residues.
(b) Bovine chymotrypsinogen has a molecular weight of 25.6 kDa. Amino acid analysis shows that this enzyme is 9% alanine (r 89.1 ). Calculate how many alanine residues are present in a molecule of bovine chymotrypsinogen. Round your answer to the nearest whole number.
The average molecular weight of bovine cytochrome c = 13800 Da
Explanation:
bovine cytochrome c contains 2 methionine residues
so the 1 mole of bovine cytochrome c will contain 2 moles of methionine residues.
molar mass methionine residue = 149 g/mol
if both residues are present at the terminal, then
'C' terminal eliminates the 'H' group and the 'N' terminal eliminate the 'OH' group
its mass = (2*149) - 1 - 17 = 280 g
mass of methionine residues in 1 mole of bovine cytochrome c = 280 g
mass % of methionine residues in bovine cytochrome c = 2%
mass % = (mass of individual component / total mass of the compound ) *100
mass % of methionine residues = (mass of individual methionine residues/mass of bovine cytochrome c ) *100
mass of individual methionine residues = 280 g
mass % of methionine residues in bovine cytochrome c = 2%
2 = (mass of individual methionine residues/mass of bovine cytochrome c ) *100
(2/100) = (280 / mass of bovine cytochrome c)
0.02 = (280 / mass of bovine cytochrome c)
mass of bovine cytochrome c = 280 / 0.02 = 14000 g
mass of bovine cytochrome c = 14000 g
since this calculation is done for 1 mole of bovine cytochrome c
so the mass of 1-mole bovine cytochrome c = 14000 g
mass of 1-mole bovine cytochrome c = molecular weight of bovine cytochrome c
The molecular weight of bovine cytochrome c = 14900 g/mol
1 g/mol = 1 Da
the molecular weight of bovine cytochrome c when both residues are terminal = 14900 Da
when both residues are not present at the terminal, then
non-terminal eliminate H2O group
mass of residues = 2*(149 -18 ) = 262 g
mass % of methionine residues = (mass of individual methionine residues/mass of bovine cytochrome c ) *100
2 = ( 262 / mass of bovine cytochrome c ) *100
0.02 = 262 / mass of bovine cytochrome c
mass of bovine cytochrome c = 262 / 0.02 = 13100 g/mol
the molecular weight of bovine cytochrome c = 13100 Da
when one residue is N terminal and one is non-terminal
N- terminal eliminate 'OH' group and non-terminal eliminate H2O group
mass of residues = (2*149) - 18 - 17 = 263 g
mass % of methionine residues = (mass of individual methionine residues/mass of bovine cytochrome c ) *100
2 = ( 263 / mass of bovine cytochrome c ) *100
0.02 = 263 / mass of bovine cytochrome c
mass of bovine cytochrome c = 263 / 0.02 = 13150 g/mol
the molecular weight of bovine cytochrome c = 13150 Da
when one residue is C terminal and one is non-terminal
C- terminal eliminates the 'H' group and non-terminal eliminates the H2O group
mass of residues = (2*149) - 18 - 1 = 279 g
mass % of methionine residues = (mass of individual methionine residues/mass of bovine cytochrome c ) *100
2 = ( 279 / mass of bovine cytochrome c ) *100
0.02 = 279 / mass of bovine cytochrome c
mass of bovine cytochrome c = 279 / 0.02 = 13950 g/mol molecular weight of bovine cytochrome c = 13950 Da
taking average all this = (14900 + 13100 + 13150 +13950) / 4 = 55100/4 = 13775 Da
The average molecular weight of bovine cytochrome c = 13775 Da
rounding off to three significant figures
The averages molecular weight of bovine cytochrome c = 13800 Da.
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Arrange the measurements from longest length to shortest length.
Answer:
[tex]{ \boxed { \rm{ \: \: \: \: \: \: \: 1 \: mi \: \: \: \: \: \: \: \: }}} \\ { \boxed{ \rm{1 \times {10}^{11} \: nm }}} \\ { \boxed{ \rm{ \: \: \: \: \: \: \: \: \: \: 10 \: m \: \: \: \: }}} \\{ \boxed { \rm{ \: \: \: \: \: \: 50 \: in \: \: \: \: \: \: \: \: }}}[/tex]
Explanation:
• For first length:
[tex]{ \tt{ 1 \times {10}^{11} \: nm = (1 \times {10}^{11} ) \times {10}^{ - 9} \: m }} \\ \\ { \tt{ = 1 \times {10}^{(11 - 9)} \: m}} \\ \\ { \tt{ = 1 \times {10}^{2} = 100 \: m }}[/tex]
• For second length is 10 m
• For third length
[tex]{ \tt{1 \: mi = 1609 \: m}}[/tex]
• For forth length;
[tex]{ \tt{1 \: in = 0.0254 \: m}} \\ { \tt{50 \: in = (50 \times 0.0254)}} \\ = { \tt{1.27 \: m}}[/tex]
Label the zeros in this number as either significant or not significant.
0.02050
The zeros significant or not significant in number 0.02050 is significant zeros is 2 = in 2050 and not significant zeros is 2 = 0.0
Significant and non significant zeros,
All zeros between two non - zeros digits are significant like in 0.0205
All leading zeros are not significant .they are nothing than place holders
All trailing zeros to the right of the decimal are significant.
All trailing zeros in a whole no. with no decimal is not significant.
Here,in the no.
0.02050
↓ ↓ ↓ ↓
not significant || significant
Thus,The zeros significant or not significant in number 0.02050 is significant zeros is 2 = in 2050 and not significant zeros is 2 = 0.0
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This distance-time graph shows the speeds of four toy cars.
Distance (m)
Based on evidence in the graph, which car is the fastest?
The slope of the distance-time graph is used to determine speed. Vehicle A is travelling more quickly because A's slope is greater than B's slope.
How is a speed-time graph drawn?Distance (m) automobile is the fastest according to the data in the graph
A speed-time graph always plots time on the horizontal axis and speed on the vertical axis. This depicts a particle's motion as it increases in speed from a speed of u at time 0 to v at time t.
A speed-time graph demonstrates how a moving object's speed varies over time. The acceleration increases as the graph becomes more pronounced.
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3) From the electrical conductivity,' section, compare the extent of conductivity of the mixture
containing equal volumes of acetic acid and aqueous ammonia to the conductivity of acetic acid
and ammonia alone. Explain.
The solution of acetic acid and aqueous ammonia are seem to be have more conductivity than the solution of acetic acid and aqueous ammonia alone.
What is Conductivity?Conductivity is defined as the capability of the aqueous solution to carry electric current
It is also defined the reciprocal of the resistivity.
What is Electrical Conductivity?Electrical conductivity is defined as the voltage which is required to obtain an amount of electric current to flow. This is mostly determined by the number of electrons present in the outermost shell; these type of electrons determine the ease by which mobile electrons are generated.
Now, it can explained that the aqueous solution of acetic acid and aqueous ammonia are seem to be have more conductivity because they both react to give the ions CH3COO(-) and NH4+.
But alone they weakly ionize to conduct electric current.
More the electric current more will be the conductivity.
Thus, we concluded that the solution of acetic acid and aqueous ammonia have more conductivity than the solution of acetic acid and aqueous ammonia alone.
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If the amount of radioactive iron-59 in a sample prepared for study of iron metabolism in the spleen decreases from 1.6 g to 0.40 g in 84.0 days, what is the half-life of iron-59?
The half life of the radioactive iron-59 is 42 days.
What is half life?
This is the time taken for a radioactive isotope to decay to half of its original size.
The half life of the radioactive iron-59 is calculated as follows;
N(t) = N₀(¹/₂)^t/h
where;
h is the half life of the radioactive iron-590.4 = 1.6(¹/₂)^84/h
log(0.4/1.6) = 84/h log(¹/₂)
-0.602 = 84/h(-0.3)
84/h = 2
h = 42 days
Thus, the half life of the radioactive iron-59 is 42 days.
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Thinking about valence electrons, which groups would go best together? Name 2 sets
Valence electrons are the electrons present in the outermost shell s and p, or outermost energy level, of an atom.
valence electrons in each group are:-
Groups 3-12 (transition metals)= 2* (Here 4s shell is complete and it cannot hold any more electrons).
Valence electrons determine the electrical conductivity of an element. Depending on the nature of elements it can be metal, non-metal, or metalloid.
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A glass dropper delivers liquid so that 25 drops equal 1.00 mL. How many milliliters are in 37 drops?
In which of these statements are protons, electrons,
and neutrons correctly compared?
O Quarks are present in protons and neutrons but not in electrons.
O Quarks are present in protons, neutrons, and electrons.
O Quarks are present in neutrons and electrons but not in protons.
• Quarks are present in protons and electrons but not in neutrons.
Neutrons have no charge, protons have a positive charge, and electrons have a negative charge. One proton's positive charge and one electron's negative charge are equal. While electrons have essentially negligible mass, protons and neutrons each have a mass of 1.
In which of these statements are protons, electrons, and neutrons correctly compared?
"Quarks are present in protons and neutrons but not in electrons."
Protons and neutrons contain quarks, while electrons do not. Subatomic particles known as quarks have mass but no charge at all. Quarks are the building blocks of protons and neutrons, but electrons are not because they are energy travelling with an electric charge rather than matter with mass. Given that quarks have mass, they cannot be found in electrons.
Undoubtedly among the tiniest particles in the universe are quarks. They are fundamental, irreducible, and incapable of being broken down into smaller parts.
The gravitational force, electromagnetic force, strong nuclear force, and weak nuclear force are the only four fundamental physical forces that quarks can freely interact with.
There are six different types of quarks, and they are never found in nature alone; rather, they form hadrons, which are composed of two or three quarks and are referred to as mesons or baryons, respectively.
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Answer letter B please
Yeah i just use this calculator
https://www.calculatorsoup.com/calculators/physics/density.php