The mass of lead present in 6.0 × 10³ g if the lead content is 0.62 ppm is 0.0037 g of lead.
What is a part per million concentration?One part per million (ppm) concentration is equivalent to 1 milligram of a solute per liter of water (mg/l) or 1 milligram of something per kilogram soil (mg/kg).
The mass of lead present in 6.0 × 10³ g if the lead content is 0.62 ppm is calculated as follows:
Mass of lead in blood = 0.62 * 1 mg/kg * 6.0 × 10³ g / 1000
Mass of lead in blood = 0.0037 g of lead
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Complete question:
The “normal” lead content in human blood is about 0.40 part per million (that is, 0.40 g of lead per million grams of blood). A value of 0.80 part per million (ppm) is considered to be dangerous. How many grams of lead are contained in 6.0 × 10³ g of blood (the amount in an average adult) if the lead content is 0.62 ppm?
PLEASE GUYS I NEED THIS ASAP
Express in moles:
a) 6.02.10²2 C₂H₂ molecules;
b) 1.80-1024 nitrogen atoms;
c) 3.01-1023 NH, molecules.
What is the molar mass of these substances?
Answer:
a)0.1moles
b)2.99moles
c)0.5moles
expressed in molar mass
a)26g/mol
b)14g/mol
c)17g/mol
Explanation:
remember
1mole=6.02×10^23
6. Observe the reaction below and choose the best answer which completes the
reaction.
C-C=C + HOH ===> ?
(will you be able to determine the answer?)
Answer:
The answer to this reaction would be C-C-OH + H2.
1.50x10^-1 m glucose solution made by dissolving the glucose in 100.0 kg of water:
2.60x10^-2 m Na2CrO4 solution made by dissolving the Na2CrO4 in 1000.0 g of water:
1.00×10^-1 m urea solution made by dissolving the urea in 500.0 g of water:
1.50x10 ⁻¹ m glucose solution made by dissolving the glucose in 100.0 kg of water is 15 mole of glucose.
What is molarity ?The term molarity defined as the moles of a solute per liters of a solution. It is denoted by symbol (M).
1.50x10 ⁻¹ m glucose solution contain 1kg of water
Therefore, 100 kg of of water contain ( 1.50x10 ⁻¹ × 100)
= 15 mole of glucose
According to definition of molarity of solution
2.60x10⁻² m Na₂CrO₄ in 1 kg of water
Therefore, 2.60x10⁻² m Na₂CrO₄ in 1000.0 g of water = 2.60x10⁻² m Na₂CrO₄
1kg or 100gram of water contain 1.00×10⁻¹ m urea
Therefore, 500.0gram of water contain 1.00×10⁻¹/1000 ×500
= 0.05 mole of urea
Thus, 1.50x10 ⁻¹ m glucose solution made by dissolving the glucose in 100.0 kg of water is 15 mole of glucose.
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A rock weighing 32.0g is placed in a graduated cylinder displacing the volume from 12.3mL to 16.8mL. What is density of the rock in g/mL?
The density of the rock as we have it is 7.11 g/mL.
What is the density of the object?We know that when we talk about the density of the object we are talking about the ratio of the mass of the object to the volume of the object. In the case that we have here we know that the rock weighing 32.0g is placed in a graduated cylinder displacing the volume from 12.3mL to 16.8mL.
Volume of the rock is the volume of the fluid that has been displaced by the rock as such we have;
Density = mass/ volume
= 32.0 g/16.8 mL - 12.3 mL
= 7.11 g/mL
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What happens during plate tectonics
In plate tectonics, lithosphere which is made up of the crust and upper mantle—is broken into large rocky plates. These plates lie on top of a partially molten layer of rock called the asthenosphere.
What are plate tectonics?
Plate tectonics is a scientific theory that explains how major landforms are created as a result of Earth’s subterranean movements. The theory, which solidified in the 1960s, transformed the earth sciences by explaining many phenomena, including mountain building events, volcanoes, and earthquakes.
In plate tectonics, Earth’s outermost layer, or lithosphere—made up of the crust and upper mantle—is broken into large rocky plates. These plates lie on top of a partially molten layer of rock called the asthenosphere. Due to the convection of the asthenosphere and lithosphere, the plates move relative to each other at different rates, from two to 15 centimeters (one to six inches) per year.
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The organic compound di‑n‑butyl phthalate, C16H22O4(l), is sometimes used as a low‑density (1.046 g⋅mL−1) manometer fluid. Compute the pressure in torr of a gas that supports a 571 mm column of di‑n‑butyl phthalate. The density of mercury is 13.53 g⋅mL−1.
The pressure of a gas that supports a 571 mm column of di‑n‑butyl phthalate is 31.85 torr.
According to the ideal gas equation
P × V = n × R × T
n = number of moles (mol)R = gas constantAccording to Stoichiometry n = m ÷ M or n m ÷ A
m = mass (grams) M = molecular mass (g/mol)A = atomic mass (g/mol)A for mercury (Hg) = 200.59 g/molP × V = n × R × T
P × V = (m/M) × R × T
P × M = (m/V) × R × T
The formula for densityP × M = ρ × R × T
For mercury
For 1 mm mercury, the pressure is 1 torrh = 571 mmP mercury = 571 mm × 1 torrFor C₁₆H₂₂O₄
RT = 8,465.402 torr mL mol⁻¹ because same condition as mercuryρ = 1.046 g/mLP × M = ρ × R × TLearn more about ideal gas equation here: https://brainly.com/question/27751527
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The organic compound di‑n‑butyl phthalate, C16H22O4(l), is sometimes used as a low‑density (1.046 g⋅mL−1) manometer fluid.31.85 torr is the pressure in torr of a gas that supports a 571 mm column of di‑n‑butyl phthalate. The density of mercury is 13.53 g⋅mL−1.
What is an ideal gas equation ?The ideal gas equation is represented as: PV = nRT.
In this equation, P refers to the pressure of the ideal gas, V is the volume of the ideal gas, n is the total amount of ideal gas that is measured in terms of moles, R is the universal gas constant, and T is the temperature.
By an ideal gas equation
P × V = n × R × T
Where,
n = number of moles (mol)
R = gas constant
The value of R differs depending on the units used
T = temperature
P = pressure
V = volume
According to Stoichiometry
n = m ÷ M or n m ÷ A
Where,
m = mass (grams)
M = molecular mass (g/mol)
A = atomic mass (g/mol)
A for mercury (Hg) = 200.59 g/mol
A to C = 12 g/mol
A for H = 1 g/mol
A for O = 16 g/mol
M for C₁₆H₂₂O₄
= (16 × 12) + (22 × 1) + (4 × 16)
= 192 + 22 + 64
= 278
P × V = n × R × T
P × V = (m/M) × R × T
P × M = (m/V) × R × T
The formula for density
ρ = m/V
ρ = density
P × M = ρ × R × T
For mercury
For 1 mm mercury, the pressure is 1 torr
h = 571 mm
P mercury = 571 mm × 1 torr
P mercury = 571 torr
ρ = 13.53 g/mL
P × M = ρ × R × T
P × A = ρ × R × T
571 × 200.59 = 13.53 × R × T
RT = 114,536.89 / 13.53
RT = 8,465.402 torr mL mol⁻¹
For C₁₆H₂₂O₄,
RT = 8,465.402 torr mL mol⁻¹ because same condition as mercury
ρ = 1.046 g/mL
P × M = ρ × R × T
P × 278 = 1.046 × 8,465.402
P = 8,854.81 / 278
P = 31.85 torr
Thus, 31.85 torr is the pressure in torr of a gas that supports a 571 mm column of di‑n‑butyl phthalate. The density of mercury is 13.53 g⋅mL−1.
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A gas occupies a volume of 45.8 liters at STP. How many molecules would be in
this volume of gas?
Answer:
2.04 moles
Explanation:
1 liter = 1 [tex]dm^{3}[/tex]
and at S.T.P (standard temperature and pressure) one mole of any gas occupies 22.414 [tex]dm^{3}[/tex]
setting up mole and volume ratio
moles : volume
1 : 22.414
X : 45.8
X = 45.8/22.414
X = 2.04 moles
Which quantity in each of the following pairs is smaller?
a) 154 pm or 7.7 x 10^-9 cm
b) 1.86 x 10^11 μm or 2.02 x 10² km
c) 2.9 GA or 3.1 10^15 μA
3) What mass of ethanol could burn in 100 g of oxygen? C2H5OH + 3 02 2 CO2 + 3 H2O
PLS HELP I AM HAVING A PANIC ATTACK RN me I think I did it wrong and I’m so confused and sry if it’s a little blurry my back camera is ruined
You may therefore simply clean the lens with a microfiber cloth to fix your blurry backup camera.
How do I fix my blurry back up camera?You may therefore simply clean the lens with a microfiber cloth to fix your blurry backup camera.Remove any stains from the camera that can obstruct your view by trying to wipe it down with a cleaning solution.In addition, some cameras have a lens-cleansing auto option that you can use.Inappropriate shutter speed utilization is the most frequent cause of blurry photos.You may therefore simply clean the lens with a microfiber cloth to fix your blurry backup camera.Camera shake has a lower probability the faster your shutter speed is.When using a handheld camera, this is especially true.At slow shutter speeds, hand holding a camera steadily is impossible for anyone.To learn more about camera refer
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What volume of water (H_{2}*O) in milliliters, can vaporize at 100C given 163 kJ of energy? For water, Delta H vap =40.66 kJ mol .
The volume of the water is obtained as 72 mL.
What is the volume of the water?We know that the heat of vaporization is the heat that is required to raise convert the substance from the liquid state to the gaseous state. Now, we know that we can be able to find the energy from the use of the formula;
H = mL
H = heat that is required
m = Number of moles of the object
L = Heat of vaporization
We know from the problem that we have that;
H = 163 kJ
L = 40.66 kJ/mol
Then we would have;
Number of moles = H/L
= 163kJ/40.66 kJ/mol
= 4 moles
Mass of water = 4 moles * 18 g/mol = 72 g
Since the density of water = 1 g/mL
Volume = Density * mass
= 1 g/mL * 72 g
= 72 mL
Thus, the volume of the water that would be vaporized in the process that we have described is about a volume of 72 mL.
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The emf of a cell measured by means of a hydrogen electrode
against a saturated calomel electrode at 298K is 0.4188 V. If the pressure of the H2 (g)
was maintained at 1atm, calculate the pH of the unknown solution, given potential of
reference calomel electrode is 0.2415 V
Using Nernst equation, the pH of the unknown solution is 2.99
What is Nernst EquationThe pH of an unknown solution can be calculated by using the Nernst equation, which relates the cell potential (emf) to the concentrations of the species involved in the half-reaction. The Nernst equation for the hydrogen electrode is as follows:
E = E₀ + (0.05916/n) * log(H+)
Where:
E = cell potential (emf) in voltsE₀ = standard potential of the electrode (0.4188 V)n = number of electrons involved in the half-reaction (1 for H+)H+ = concentration of hydrogen ions in moles/liter (pH)Given that the pressure of H₂(g) was maintained at 1atm, we can assume that the concentration of H⁺ is equal to the concentration of H₃O⁺ in the unknown solution.
Rearranging the equation we get:
pH = -log(H⁺) = (E - E₀) / (0.05916/1)
Substituting E = 0.4188 V and E₀ = 0.2415 V we get:
pH = (0.4188 - 0.2415) / (0.05916/1) = 2.996
Therefore, the pH of the unknown solution is 2.99.
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The density of titanium is 4.54 g/mL. The water level in a graduated cylinder initially at 25.0 mL rises to 31.0 mL after a piece of titanium is submerged. What is the mass, in grams, of the titanium?
mass can be calculated using the formula: [tex]m=DV[/tex]
m = massD = density of a substanceV = volume of water displaced (final amount - initial amount)[tex]m=(\frac{4.54g}{1mL})(6.0mL)[/tex]
[tex]m = 27g[/tex]
Compare the reactivity of Magnesium with the metals in Group 1 and explain the differences in their reactivity ( based on their properties and chemical structure )
Magnesium is less reactive than the elements of group 1.
What is reactivity?Before we get into the question, it is good that we know what we mean by reactivity in chemistry. When we use the term reactivity, we are trying to look at how two or more substances can be able to combine together.
We know that the reactivity of the metals would depend on the position of the metals in the electrochemical series as well as the position of the metal in the perioidic table of the elements.
Given that the atoms of the elements that we have in group 1 are more electro positive than magnesium, they are going to be much more reactive than the element magnesium and this is evidence by the reduction potentials of the elements that we can easily see from the standard tables.
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NEED ASAP!
An absorption measurement with a 1 cm path length yields a reading of 0.002 absorbance units with a noise of 0.0005 absorbance units and a mean noise reading of 0 for 5 scans averaged together. Assuming the noise for a single scan does not change if the path length is increased to 5 cm and the number of scans is increase to 65, what is the signal to noise of the new measurement. Remember signal averaging
The signal-to-noise ratio (S/N) is a measure of the strength of the signal relative to the noise. In this case, the signal is the absorbance reading of 0.002 absorbance units, and the noise is the standard deviation of the noise, which is 0.0005 absorbance units.
The S/N for the 1 cm path length measurement is:
S/N = (signal) / (noise) = 0.002 absorbance units / 0.0005 absorbance units = 4
If the path length is increased to 5 cm and the number of scans is increased to 65, the signal will also increase by a factor of 5, but the noise will not change. Therefore, the signal will be 5 times larger and the noise will be the same, so the S/N will increase.
The signal for the new measurement is 5 * 0.002 = 0.01 absorbance units
The S/N for the new measurement is:
S/N = (signal) / (noise) = 0.01 absorbance units / 0.0005 absorbance units = 20
When you increase the path length by 5 times, the signal increases by 5 times, but the noise remains the same. Therefore, the signal-to-noise ratio will increase by a factor of 5. Similarly when you increase the number of scans, you are averaging the signal, which will reduce the noise, but the signal will remain the same. So the signal-to-noise ratio will increase.
Platinum -186 would have how many protons and how many neutrons
Platinum (Pt) has six naturally occurring isotopes (190Pt, 192Pt, 194Pt, 195Pt, 196Pt and 198Pt). Platinum -186 would have 78 number of protons and 117 number of neutron.
What is Platinum ?Platinum is a chemical element represented by the symbol Pt and the atomic number is 78. It is malleable, ductile, highly unreactive, precious, silverish-white transition metal. Platinum (Pt) has six naturally occurring isotopes (190Pt, 192Pt, 194Pt, 195Pt, 196Pt and 198Pt).
Platinum is classified as a transition metal. Platinum atoms have 78 electrons and 78 protons with 117 neutrons in the most abundant isotope of platinum.
Thus, Platinum -186 would have 78 number of protons and 117 number of neutron.
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How many millimeters are there in 12 dekameters?
Use the periodic table to fill in the numbers in the electron configurations shown below
Na: 1s^22s^C2p^D3s^E
C=
D=
E=
Answer: C = 2, D = 6, E = 1
Explanation:
Na is the first element in the 3s row of the s block on the periodic table, meaning that the exponent (E) will be 1.
C is 2 because, to get to Na, you need to fill the orbitals previous. To fill the 2s row, you need an exponent of 2.
D is 6 because you need to fill the 2s row of the s block.
A cylinder with a movable piston contains 7.00 moles of helium. What is the final amount of moles in the cylinder if the volume was changed from 8.00 L to 12.7 L? (Don't forget to check that your units are correct).
30 points
For a cylinder containing 7.00 grams of helium and a moveable piston. If the capacity was adjusted from 8 l to 12.7 l, the ultimate quantity of moles inside the cylinder would be 11.110 l.
Describe a cylinder?
The three-dimensional shape of a cylinder is made up of two parallel round base connected by a curved surface. The right cylinder is formed when the circular bases' centres cross each other. Right cylinders have parts that are parallel to the planes that include the bases; otherwise, they are referred to as oblique cylinders.
A round cylinder is what?
The circular cylinder is a cylinder with circular bases that are parallel to one another. Three dimensions are involved.
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HNO2
CH3-CH-CH3 ________ ?
|
NH-CH3
what will be the product?
Explanation: When C
6
H
5
CH₂NH
2
reacts with HNO
2
, the product will be C
6
H
5
CH
2
OH.
Find the number of miles of sulfur in 452 g of sulfur (show work please)
The number of mole in 452 grams of sulphur is 14.125 mole
How do I determine the number of mole of sulphur?The number of mole in a substance is defined as the ratio of mass to the molar mass of the subtance. This is illustrated below:
Mole = mass / molar mass
Applying the above formula, we can determine the number of mole in 452 grams of sulphur. Details below
Mass of sulphur = 452 grams Molar mass of sulphur = 32 g/mol Number of mole of sulphur =?Mole = mass / molar mass
Number of mole of sulphur = 452/ 32
Number of mole of sulphur = 14.125 mole
Thus, the number of mole is 14.125 mole
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3 Cu + 8HNO3 --> 3 Cu(NO3)2 + 2 NO + 4 H₂O In the above equation how many grams of water can be made when 9 grams of HNO3 are consumed?
Answer:
It looks like the equation is already balanced for you, so the first step will be to convert 144.1 grams of HNO3 to moles.
Help with chemistry??
Answer:
The first image = double replacement
Second = single replacement
Third = Decomposition
Fourth = Combination
Explanation:
1. a color from each pair is being swapped and replacing each other so there is a double replacement
2. only the blue and the red are changing places so it is single replacement
3. the pair is being separated (decomposed)
4. the red and green are coming together (combined)
A chemist weighed out 5.4 g of aluminum. Calculate the number of moles of aluminum she weighed out.
Be sure your answer has the correct number of significant digits.
mol
The chemist weighed out 0.2 moles of aluminum.
To calculate the number of moles of aluminum, we need to use the formula:
moles = mass / molar mass
The molar mass of aluminum is 27 g/mol. Therefore, the number of moles of aluminum in 5.4 g can be calculated as:
moles = 5.4 g / 27 g/mol = 0.2 (mol)
So the chemist weighed out 0.2 moles of aluminum.
It is important to note that the number of moles should have the same number of significant digits as the mass measured.
Choose the 2 statements that are true of the population shown in this graph? (Selet all that apply)
There are many factors at work to control the population.
The number of individuals is increasing.
The population is not changing much over time.
The population is growing unchecked.
The two (2) statements that are true of the population shown in this graph include the following:
B. The number of individuals is increasing.
D. The population is growing unchecked.
What is a population?In Science, a population can be defined as a set of similar items or events that comprises every member of a group and from which a researcher, scientist, or experimenter, obtains or generates data for a statistical study.
What is population size?A population size can be defined as the number of individual (each) living organisms in a population, and it is usually denoted by N. Basically, population size is primarily associated with the number of genetic variation or genetic drift in a particular population.
Based on the graph, we can logically deduce that the number of individuals is increasing because the line models an exponent growth, which is also growing unchecked.
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this molecule has the condensed structure c h 2 c (c 6 h 5) c h 2 c h 3. c 6 h 5 is a six carbon ring with alternating double bonds. name
This molecule is known as 2-(Phenylethyl) tetrahydrofuran.
Benzene is a colourless liquid chemical at room temperature. It is utilised primarily as a solvent in the pharmaceutical and chemical industries, as a starting material and an intermediate in the synthesis of numerous chemicals, and in gasoline. Both natural and man-made processes produce benzene.
Benzene is one of the most important organic compounds with the chemical formula C₆H₆. Benzene is the parent compound of various aromatic compounds.
2-(Phenylethyl) tetrahydrofuran has a ring structure of benzene (C₆H₅), and an alkyl group (CH₂CH₃) attached to it. The molecule has a total of 16 carbon atoms and 33 hydrogen atoms.
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Explain how the DNA from two different kinds of organims can be combined
The DNA from two different kinds of organisms can be combined through recombinant DNA technology.
What is Deoxyribonucleic acid (DNA)?Deoxyribonucleic acid (DNA) is defined as the hereditary material that has the ability to transfer genetic material from a parent cell to its offspring.
The Deoxyribonucleic acid of a particular organism can be transferred to another organisms through the recombinant DNA technology.
Therefore, the concept that is used to combine the DNA of two different organisms is the recombinant DNA technology which inserts into a host organism another DNA, to produce new genetic combinations that are of value to science, medicine, agriculture, and industry.
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The heart appears to be divided in half, with two separete sections for receiving and pumping blood. Where does each half receive blood? to where does each half pump blood?
The right side of the heart receives oxygen poor blood from the veins and pumps it to your lungs where it picks up oxygen and gets rid of carbon dioxide. The left side of the heart receives oxygen rich blood from the lungs and pumps it through arteries to the rest of the body.
What is heart?It's the muscle at the centre of your circulation system pumping blood around your body as your heart beats. This blood sends oxygen and nutrients to all parts of your body and carries away unwanted carbon dioxide and waste products.
Therefore,the heart sends blood around your body. The blood provides your body with the oxygen and nutrients it needs. It also carries away waste. Your heart is sort of like a pump or two pumps in one.
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What is the [OH-] in a solution that has a pOH = 2.28
Show explanations please.
Answer:
The value of pOH of a solution is 2.28
We need to find the [OH-] in a solution. We know that,
pOH=-\text{log}[OH^-]pOH=−log[OH−]
Put all the values,
\begin{gathered}2.28=-\log[OH^-]\\\\=0.00524\end{gathered}2.28=−log[OH−]=0.00524
So
CALCULATE THE [H3O+] FOR A URINE SAMPLE, WHICH HAS A PH OF 7.5
use the formula [H3O+] = 10^-pH
plug in the pH [H3O+] = 10^-7.5
so [H3O+] = 3.162*10^-8 M
