Which weighs more, a mole of lead or a mole of helium?

Magnesium is less reactive than the elements of group 1.

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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Using Nernst equation, the pH of the unknown solution is 2.99

The 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:

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 volume of the water is obtained as 72 mL.

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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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

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

The density of the rock as we have it is 7.11 g/mL.

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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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

According to Stoichiometry n = m ÷ M or n m ÷ A

P × V = n × R × T

P × V = (m/M) × R × T

P × M = (m/V) × R × T

P × M = ρ  × R × T

For mercury

For C₁₆H₂₂O₄

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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.

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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You may therefore simply clean the lens with a microfiber cloth to fix your blurry backup camera.

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56) The Aufbau principle has been violated. Option C

57) Hund's rule was violated. Option A

58) This is a valid orbital diagram. Option D

We know that as we fill the electrons in to the atoms of the elements there bare some rules that we have to observe in the process and all of these rules are the things that make up what we call the Aufbau principle.

In effect one of the rules that we ought to know is the Pauli  exclusion principle that states that electrons  do not have the same values for all the four quantum numbers.

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1.50x10 ⁻¹ m glucose solution made by dissolving the glucose in 100.0 kg of water is 15 mole of glucose.

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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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.

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.

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 number of mole in 452 grams of sulphur is 14.125 mole

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

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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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.

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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Answer:

The answer to this reaction would be C-C-OH + H2.

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.

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

Answer:

The number and variety of plants would increase.

Explanation:

A is incorrect because if deer eat plants and the population of deer are increased there wouldn't be an increase of plants. There would be a decrease of plants be ause there would be more deer eating plants. B is incorrect because if there are more deer, then the amount of plants will also decrease. C is correct because with a surplus of deer, the amount of plants would decrease because of all the deer. Therefore, the variety of plants would decrease because they are being eaten. D is incorrect because if there is a population growth of deer, that means more deer are eating the plants. So, the plant population would decrease.

Hope this helps! :)

In a forest, deer eat plants for survival.The number and variety of plants would increase in the deer population to affect the plant life of an ecosystem. Therefore, option A is correct.

An ecosystem is a geographical area in which plants, animals, and other organisms, as well as weather and landscape, coexist to form a life bubble. Ecosystems contain both biotic (living) and abiotic (nonliving) components.

An ecosystem is a group of living organisms (plants, animals, and microbes) in a specific location. The term 'eco' refers to a region of the world, and the term'system' refers to the organizing units.

Because deer eat a wide variety of plants, the plant population would suffer as a result. More deer necessitates more food. Plant predation by deer populations would reduce the population of other animals that eat plants and plant seeds.

Thus, option A is correct.

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The empirical formula of the compound with 14.3% Nitrogen, 4.1% Hydrogen, and 81.6% Bromine would be [tex]NH_4Br[/tex].

The compound contains 3 atoms of different elements according to the following percentage:

Let's find the mole equivalent of each percentage:

Divide by the smallest mole:

Thus, the empirical formula of the compound is [tex]NH_4Br[/tex].

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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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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)

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.

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.

use the formula     [H3O+] = 10^-pH

plug in the pH    [H3O+] = 10^-7.5

so    [H3O+] = 3.162*10^-8 M

The DNA from two different kinds of organisms can be combined through recombinant DNA technology.

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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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.

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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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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