The following table lists molecular weight data for a polypropylene material. Molecular Weight Range (g/mol) xi wi
8,000 - 16,000 0.07 0.03 16,000 - 24,000 0.15 0.09 24,000 - 32,000 0.26 0.21 32,000 - 40,000 0.27 0.27 40,000 - 48,000 0.18 0.28 48,000 - 56,000 0.07 0.12
Click here to access Table 14.3. Atomic weights for several elements are included in the following table: Carbon 12.01 g/mol Chlorine 35.45 g/mol Fluorine 19.00 g/mol Hydrogen 1.008 g/mol Oxygen 16.00 g/mol Nitrogen 14.01 g/mol Compute the following:
(a) the number-average molecular weight, Enter your answer for part (a) in accordance to the question statement g/mol
(b) the weight-average molecular weight, Enter your answer for part (b) in accordance to the question statement g/mol
(c) the degree of polymerization.

Answer:

\(V=0.200L\)

Explanation:

Hello,

In this case, since the volumetric capacity of the beaker is 200 cm³, by considering that 1000 cm³ equals 1 L, the liters are then computed via the following unit conversion:

\(V=200cm^3*\frac{1L}{1000cm^3}\\ \\V=0.200L\)

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Answer:

It is a reversible esterification reaction.

Explanation:

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Answer:

To determine the molecular formula, we need to find the empirical formula first.

1. Find the moles of CO2 produced:

moles of CO2 = mass of CO2 / molar mass of CO2

moles of CO2 = 2.417g / 44.01 g/mol = 0.05499 mol

2. Find the moles of H2O produced:

moles of H2O = mass of H2O / molar mass of H2O

moles of H2O = 1.484g / 18.02 g/mol = 0.08232 mol

3. Find the moles of C in the compound:

moles of C = moles of CO2

moles of C = 0.05499 mol

4. Find the moles of H in the compound:

moles of H = 2 x moles of H2O

moles of H = 2 x 0.08232 mol = 0.16464 mol

5. Find the moles of O in the compound:

moles of O = (moles of CO2 x 2) + moles of H2O

moles of O = (0.05499 mol x 2) + 0.08232 mol = 0.1923 mol

6. Find the empirical formula:

Divide all the moles by the smallest number of moles to get the simplest whole-number ratio of atoms.

empirical formula = C1H3O1 or CH3O

7. Find the molecular formula:

To find the molecular formula, we need to know the molecular mass of the compound. The molecular mass is 46 g/mol. We can calculate the ratio of the molecular mass to the empirical formula mass:

molecular mass / empirical formula mass = 46 g/mol / 31 g/mol = 1.483

Round this number to the nearest whole number, and multiply the subscripts of the empirical formula by this number to get the molecular formula:

molecular formula = C2H6O2 or C2H6O2

The molecular formula of the compound is C4H4.

To determine the molecular formula of the organic compound, we need to analyze the masses of the elements present and calculate the empirical formula. Given the masses of carbon dioxide (2.417 g) and water (1.484 g) produced during combustion, we can calculate the moles of carbon and hydrogen in the compound.

Moles of carbon:

Using the molar mass of carbon dioxide (44.01 g/mol), we can calculate the moles of carbon dioxide produced:

Moles of carbon dioxide = 2.417 g / 44.01 g/mol = 0.055 moles of CO2

Since there is one mole of carbon in one mole of carbon dioxide, the number of moles of carbon in the compound is also 0.055 moles.

Moles of hydrogen:

Using the molar mass of water (18.015 g/mol), we can calculate the moles of water produced:

Moles of water = 1.484 g / 18.015 g/mol = 0.082 moles of H2O

Since there are two moles of hydrogen in one mole of water, the number of moles of hydrogen in the compound is 2 x 0.082 moles = 0.164 moles.

Now, we can determine the empirical formula by dividing the number of moles of each element by the smallest number of moles (in this case, the number of moles of carbon).

Empirical formula: C0.055H0.055/0.055 = H1

So, the empirical formula of the compound is CH.

To determine the molecular formula, we need to compare the empirical formula mass (CH = 13.02 g/mol) to the given molecular mass (46 g/mol).

Molecular formula: (46 g/mol) / (13.02 g/mol) = 3.53

Since the molecular formula must be a whole number, we round 3.53 to the nearest whole number, which is 4.

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A balanced chemical equation for the standard formation reaction of gaseous hydrogen iodide is H₂(g) + I₂(g) → 2HI(g).

Balanced chemical reactions are those in which equal amount of each entities will present on both sides of the reaction.

Formation of gaseous hydrogen iodide takes place by the mixing od hydrogen gas and iodine gas and balanced chemical equation for the formation of HI will be represented as:

H₂(g) + I₂(g) → 2HI(g)

So, required equation is H₂(g) + I₂(g) → 2HI(g).

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Answer:

Explanation:

divide by 6 to get per hour

300 kilometres per hour

Answer:

B. The cells.

call

Cells are considered the basic units of life in part because they come in discrete and easily recognizable packages. That's because all cells are surrounded by a structure called the cell membrane — which, much like the walls of a house, serves as a clear boundary between the cell's internal and external environments.

As you can see the picture, in the three given compounds i.e. ethane, ethene and ethyne, ethyne have shortest bond. Bond length of ethyne is very short when compared to the ethane and ethene. Shorter the bond, bond strength will be more. Hence, our answer is ethyne.

Answer:

ethyne has shortest bond

Answer:

How many grams is in 10.00 moles of calcium (Ca)? The number of atoms can also be calculated using Avogadro's Constant (6.02214179×1023) / one mole of substance.

Explanation:

Hope this helps

Francium (fr) is the most reactive and it is in the highest energy level out of all alkali metals.

Down the group, the alkali metals' reactivity rises. This is because as one moves down the group in alkali metals the number of shells increases and thus it becomes easy for the electron in the last shell to loss and become reactive.

Francium (Fr), which has a maximum half-life of 22 minutes, ought to be the most reactive metal in theory, but it is radioactive instead.

The earth's crust contains less than 30 grammes at any given time. It should be the most reactive because it is the least electronegative element.

It is currently impossible to obtain a laboratory-produced sample that is large enough to conduct experiments due to the material's rapid vaporisation and tremendous heat of disintegration.

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The number of moles of Boron in 4.80 moles of kryptonite is 14.4 moles of Boron.

The correct option is C.

The moles of a substance is the amount of that substance that contains as many elementary particles as there are 12 grams of carbon-12 isotope.

The moles of an element in a compound are determined from the mole ratio of the elements in 1 mole of the compound.

Given the formula for Kryptonite, NaLiSiB₃O₇(OH).

There are 3 moles of Boron in 1 mole of Kryptonite.

In 4.8 moles of kryptonite, there will be 4.8 * 3 moles of Boron.

Moles of Boron = 14.4 moles of Boron.

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Complete question:

Jadarite, a.k.a. kryptonite, has a formula of NaLiSiB₃O₇(OH).

How many moles of boron are in 4.80 moles of kryptonite?

A. 4.80 B. 10.8 C. 14.4 D. 1.60 E. 658.4

Answer:

I believe its 1,2, and 5

Explanation:

C D E

temperature of medium

type of wave

type of medium

Answer:

Explanation:

Aniline is an organic compound with the formula C6H5NH2. Consisting of a phenyl group attached to an amino group, aniline is the simplest aromatic amine.

The term that best relates to Ben's observation is the rate of reaction.

The rate of reaction is a term used to describe how quickly a reaction occurs. In reactions, reactants react to form products. Thus, the rate of a reaction refers to the rate of disappearance of reactants or the rate of appearance of products.

The burning of wood is a form of reaction because the wood burns to produce products such as ashes, heat, smoke, and gases. Thus, the rate of disappearance of the wood would be the rate of the reaction.

Therefore, the term that best relates to Ben's observation is rate of reaction.

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When a chocolate bar is solid, it is able to smell it.  It is also important to note that a substance 's molecules cannot be in two distinct phases at the a time.

In general, it is not possible for a the molecules of the chocolate  to be in two distinct phases at the same time.

It must be noted that smelling a solid, such as a chocolate bar, however, mean  the release  of loose molecules from the solid,   which may then move   through the air and   reach our olfactory receptors in our nose, allowing us to sense the fragrance.

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Using CH3NH2 and CH3NH3Cl, one may simulate the blood's buffering properties. A weak acid and its conjugate base, or a weak base and its conjugate acid, make up a buffer system.

Carbonic acid and sodium bicarbonate. Hint: Human blood has a buffer of bicarbonate anion (HCO3) and carbonic acid (H2CO3) to keep the blood's pH between 7.35 and 7.45. Blood pH values higher or lower than 7.8 or 6.8 can be fatal.

Bicarbonate anion and hydronium are in equilibrium with carbonic acid in this buffer. A weak acid and its conjugate base, or a weak base and its conjugate acid, make up a buffer.

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Answer:

CH3NH2 and CH3NH3Cl

Explanation:

Methylamine (CH3NH2) is an organic base. In order to produce a basic buffer solution similar to blood, we can combine this base with a soluble salt of its conjugate acid, such as CH3NH3Cl. The solution of KOH and H2O would not be a good buffer because KOH is a strong base. The solution of HF and NaF is a buffer, but the pKa of HF is about 3.2, which is far from the pH of blood, 7.4.

Any gross error during measuring can cause the deviation in the correct value of %w/w. This can be occurred from any carelessness or error in calculating or the presence of any impurities.

This category of measuring mistakes includes the most typical error, human error in the measurement. For instance, the person getting the reading from the instrument's meter may interpret 23 as 28. Gross mistakes can be avoided by employing the following two relevant measures:

We can decrease the obvious mistakes by increasing the number of experimenters. If each researcher takes a separate reading at various points, we can minimize the large mistakes by averaging multiple readings.

Presence of any impurities, reading error, weight loss by carelessness etc . can lead to incorrect value of %w/w.

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Answer: lighter atoms

energy

neutrons

Explanation:

A nuclear fission is simply defined as a nuclear reaction whereby the nucleus of an atom is being divided into smaller nuclei which are also lighter. An energy is also released when this occurs.

Therefore, the products of a fission include lighter atoms, energy and neutrons.

Answer:

lighter atoms

energy

neutrons

Explanation: took test

To find moles when given the molar mass, you can use the concept of molar mass as a conversion factor.Molar mass represents the mass of one mole of a substance, expressed in grams per mole (g/mol).

To calculate moles, divide the given mass of the substance by its molar mass. The equation is:

moles = mass / molar mass

For example, if you have 56 grams of carbon dioxide (CO2) and want to find the number of moles, you need to know the molar mass of CO2, which is approximately 44 g/mol. Using the equation above:

moles = 56 g / 44 g/mol

moles ≈ 1.27 mol

Therefore, there are approximately 1.27 moles of carbon dioxide in 56 grams.

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Many island chains were formed as a result of blank volcanism is known as hotspot volcanism.

Hotspot volcanism occurs when a mantle plume, a column of hot and buoyant rock material rising from deep within the Earth's mantle, reaches the surface. These mantle plumes are stationary relative to the moving tectonic plates on the Earth's surface.

As the tectonic plate moves over the stationary hotspot, the mantle plume melts and produces magma. This magma rises through the Earth's crust, creating a volcanic eruption. Over time, repeated eruptions build up layers of lava and volcanic material, forming a cone-shaped volcano. As the tectonic plate continues to move, the volcano becomes inactive, and a new volcano forms above the stationary hotspot.

However, in the case of island chains, the tectonic plate movement carries the volcanoes away from the hotspot. As a result, a trail of extinct volcanoes is left behind, forming a linear chain of islands. Each island in the chain represents a period of volcanic activity at that specific location as the plate moved over the hotspot.

Hotspot volcanism and the formation of island chains provide valuable insights into the dynamics of Earth's mantle and plate tectonics. By studying the age progression of islands in a chain, scientists can gain a better understanding of the movement and speed of tectonic plates and the behavior of mantle plumes deep beneath the Earth's surface.

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Answer:

More energy is released from the old substance than the new substance needs to form its chemical bonds

Explanation:

Chemical A and Chemical B react in an exothermic reaction. When Chemical A and Chemical B are mixed together more energy will be released from the old substance than the new substance will need to form its chemical bonds. Therefore, option B is correct.

When a chemical reaction goes on, energy is shifted to or from the surroundings. When energy is moved to the surroundings, this is called an exothermic reaction, and the temperature of the surroundings increases.

Examples of exothermic reactions are combustion reactions and many oxidation reactions.

A chemical reaction is exothermic if heat is passed by the system into the surroundings. Because the surroundings are deriving heat from the system, the temperature of the surroundings increases.

Thus, option B is correct.

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The covalent bond is formed when two atoms are able to share electrons whereas the ionic bond is formed when there is transfer of electrons.

Covalent bonds are formed as a result of the sharing of one or more pairs of bonding electrons. The electro negativities or the electron attracting ability of the two bonded atoms are either equal or the difference is no greater than 1.7. As long as the electro-negativity difference is no greater than 1.7, the atoms can only share the bonding electrons.

If the electro-negativity difference is greater than 1.7 then the higher electronegative atom has an electron attracting ability which is large enough to force the transfer of electrons from the lesser electronegative atom to the more electronegative atom. This causes the formation of ionic bonds.

The covalent bond is formed when two atoms are able to share electrons whereas the ionic bond is formed when the "sharing" is so unequal that an electron from atom A is completely lost to atom B, resulting in a pair of ions.

Each atom consists of protons, neutrons and electrons. At the centre of the atom, neutrons and protons stay together. But the electrons revolve in orbit around the center. Each of these molecular orbits can have a certain number of electrons to form a stable atom. But apart from Inert gas, this configuration is not present with most of the atoms. So to stabilize the atom, each atom shares half of its electrons.

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Answer:

arms

Explanation:

because arms can be metric system of our body

Answer:

nose and the tip of an outstretched middle finger.

Answer:

c substance

Explanation:

Matter is never destroyed or created in chemical reactions. The particles of one substance are rearranged to form a new substance. The same number of particles that exist before the reaction exist after the reaction.

Answer:

We can see that the atomic radius decreases across every row.

Explanation:

I will comment more below.

The elements that represent the highest points on the graph are all elements of group 1 and occur at the head of the period to which they belong.

The periodic table is an arrangement of elements in groups and periods. The elements in the same group have the same number of valence electrons while the elements in the same period have the same number of shells.

Looking at the graph, we can see that the high points in the graph all correspond to the group 1 elements; sodium, potassium, rubidium and cesium.The have the highest atomic radii in the period. Atomic radii increases down the group but decreases across the period. Remember that these elements are at the head of the period to which they belong hence they have the highest atomic radii.

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Answer: 1 mole of \(Ca\) has the greatest mass.

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP , contains avogadro's number \((6.023\times 10^{23})\) of particles and weighs equal to the molecular mass of the substance.

1 mole of \(Ca\) has a mass of 40 g.

1 mole of \(CO\) has a mass of 28 g

1 mole of \(O_2\) has a mass of 32 g

1 mole of \(CH_4\) has a mass of 16 g.

1 mole of \(NO\) has a mass of 30 g.

Thus the greatest mass is of 1 mole of \(Ca\)

Answer:

Yes I would believe that this report was true, because nobody would lie on a news channel that they cured cancer and then not cure it. That would completely ruin their credibility as well as the news channels credibility. So no news channel would take the story if it was made up.

I would like to see there studies on how the medicine kills off the cancer and the side effects of the medicine on the human body. I would want to know how the medicine is made, if its FDA approved, and how the medicine will be distributed across the globe and at what prices, as well as how easily the medicine expires.

Answer:

Explanation:

I will probably believe the report but want to find out more details. First is cure for which cancer has been found. Cancer is a general name for a large family of different diseases. So it is very likely that the cure is for some specific cancers.

Secondly I want to know if the cure has any side effect. The typical treatments for cancer now are radiation and chemo therapy. Both can cause serious side effects.

Lastly the cost of cure is important. New drugs with patent protection can be very expensive which limit on how many people can afford the treatment.

Answer:

a

Explanation:

pls sdame

Answer:

I guess D ...,...,.....

The outermost of the six sun layers with the letters A, B, C, D, E, and F, layer F in the cross-sectional figure symbolises the corona.

The Sun's atmosphere's outermost region is called the corona. The brilliant brightness of the Sun's surface often obscures the corona. Without employing specialised equipment, it is challenging to see. A total solar eclipse, however, makes the corona visible.

The term "corona" refers to the topmost region of the Sun's atmosphere. It rises hundreds of kilometres above the Sun's surface and gradually changes into the solar wind, which travels across our solar system.

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Answer:

Social justice aims to give individuals and groups fair treatment and an impartial share of social, environmental and economic benefits. The concept promotes the fair distribution of advantages and disadvantages within a society, regardless of background and status.

Environmental justice deals explicitly with the distribution of environmental benefits and the burdens people experience, at home, at work, or where they learn, play and spend leisure time. Environmental benefits include attractive and extensive greenspace, clean air and water, and investment in pollution abatement and landscape improvements. Environmental burdens include risks and hazards from industrial, transport-generated and municipal pollution.