f the volume of the reaction vessel in the previous part was 1.25 l , what amount of br2 (in moles) was formed during the first 15.0 s of the reaction?

Answer:

74.35 g

Explanation:

The equation  of the reaction is given as;

2Al2O3 --> 4Al + 3O2

From the reaction;

2 mol of Al2O3 reacts to produce 3 mol of O2

Converting 2 mol of Al2O3 to mass;

Number of moles = Mass / Molar mass

Mass = Number of moles * Molar mass

Mass = 2 * 101.96 = 203.92 g

Converting 3 mol of O2 to volume;

1 mol = 22.4 L

3 mol = x

x = 22.4 * 3 = 67.2 L

This means 203.92g of Al2O3 produces 67.2L of O2

xg would produce 24.5 L of O2

203.92 = 67.2

x = 24.5

x = (24.5 * 203.92) / 67.2

x = 74.35 g

Answer:

0.814

Explanation:

The molar mass of the compound is 24.8 g/mol.

Firstly, we need to convert the given volume from mL to L by dividing it by 1000:

112 mL ÷ 1000 mL/L = 0.112 L

Next, we can use the Ideal Gas Law, PV = nRT, to calculate the number of moles of the compound present in the given volume:

PV = nRT

n = (PV) ÷ RT

where P = 750. torr = 750. mmHg (since 1 torr = 1 mmHg)

V = 0.112 L

R = 0.0821 L·atm/(mol·K) (gas constant)

T = 373 K

n = (750. mmHg × 0.112 L) ÷ (0.0821 L·atm/(mol·K) × 373 K)

n = 0.0044 mol

Finally, we can calculate the molar mass (M) of the compound using its mass (m) and number of moles (n):

M = m/n

M = 0.109 g ÷ 0.0044 mol

M = 24.8 g/mol

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Liquids are more compressible than solids.

In liquids there is space between the molecules, not a lot, but there is enough space to offer some compressibility. Solids are arranged in regular patterns and their molecules are almost fixed close together.

We are given –

__________________________________________

Molar Mass of \(\bf K_2SO_4 \) –

\(\qquad\) \(\twoheadrightarrow\bf 39.09 \times 2 + 32 + (16 \times 4)\)

\(\qquad\) \(\twoheadrightarrow\bf 174.2\)

Using formula –

\(\qquad\) \(\purple{\twoheadrightarrow\bf Molarity _{(Solution)} = \dfrac{ W\times 1000}{MV}}\)

\(\qquad\) \(\twoheadrightarrow\bf Molarity _{(Solution)} = \dfrac{ 9.51 \times 1000}{174.2\times 750}\)

\(\qquad\) \(\twoheadrightarrow\bf Molarity _{(Solution)} = \dfrac{9510}{174.2 \times 750}\)

\(\qquad\) \(\purple{\twoheadrightarrow\bf Molarity _{(Solution)} = 0.073M} \)

___________________________________________

Answer:Your can use the internet There is a web site that is called periodic table.com it is very use full

Explanation:Have fun

Smell is the only special sense in which signal  reaches the cerebral cortex without passing first through the thalamus of the brain.

The brain is defined as a complex organ  which is capable of controlling various actions like thinking, memory,emotions, touch , huger and every regulatory process of our body.

Brain along with the spinal cord make up the central nervous system.The average adult brain is made up of 60% of fat and remaining 40 % comprises of water, carbohydrates, proteins and salts.

It has blood vessels and nerves which include neurons and glial cells.

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The crude oil fractions, ranked in order from lowest to highest boiling point, are gases, gasoline, naphtha, kerosene, diesel, and residual fuel oil. These fractions are obtained through the distillation process in an oil refinery. The boiling point of each fraction increases as the molecular weight and complexity of the hydrocarbon compounds increase.

During the distillation process in an oil refinery, crude oil is heated in a distillation tower, allowing it to separate into different fractions based on their boiling points. The fractions with the lowest boiling points are the gases, which include methane, ethane, propane, and butane. These gases are typically used as fuel sources or for other industrial purposes.

Next in the order of boiling points is gasoline, a mixture of hydrocarbons with relatively low boiling points. Gasoline is commonly used as a fuel for automobiles. It has a higher boiling point compared to gases but lower than the subsequent fractions.

Naphtha, with a slightly higher boiling point than gasoline, is another fraction obtained from the distillation of crude oil. It is used as a feedstock for petrochemical processes, such as the production of plastics and synthetic fibers.

Kerosene, also known as jet fuel, has a higher boiling point than naphtha. It is commonly used as aviation fuel but also finds applications in heating and lighting.

Diesel, with a higher boiling point than kerosene, is a fuel used in diesel engines for various applications, including automobiles, trucks, and generators.

Lastly, residual fuel oil, sometimes referred to as heavy fuel oil, has the highest boiling point among the fractions. It is a dense, viscous liquid used as a fuel for power generation in large industrial settings.

In summary, the order of the crude oil fractions from lowest to highest boiling point is gases, gasoline, naphtha, kerosene, diesel, and residual fuel oil. This order corresponds to the increasing molecular weight and complexity of the hydrocarbon compounds present in each fraction.

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Each iron tablet contains 152 g of iron.

The substance listed here is iron sulfate, and its chemical formula is FeSO4.

The compound's relative formula mass is calculated by multiplying the atomic masses of its constituent parts, and it is then given in grams.

The atomic mass of Fe = 55.845

The atomic mass of  S = 32.065

The atomic mass of   O = 15.994

So;

Relative formula mass is calculated as 55.845 + 32.065 + 4(15.994)  = 151.886g

Therefore, the solution is 152g

A particle's or object's mass, a dimensionless quantity, is used to represent how much matter is there (symbolized m).  The kilogram is the chosen unit of mass according to the International System (SI) (kg).

In physics, mass is a way to quantify inertia, a fundamental property of all matter.

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Answer: Your answer is Chemical weathering.

Hope this helps!

Answer:

chemical

Explanation:

I hope it help.........

Answer:

0.08937835168818843

Explanation:

1 grams Oxygen is equal to 0.062502343837894 mole.

Answer:

0.086

Explanation:

A 5.2 molal aqueous solution of methyl alcohol indicates that 5.2 moles of methyl alcohol are present in 1 kilogram (or 1000 g) of water. Water has a molecular weight of 18 g/mol.

(100g)/18g/mol=55.56 mol

5.2 mol/(5.2mol+55.56 mol)=0.086

Answer:

mass

Explanation:

Answer:

The answer is C.

Explanation:

If you have absolutely identical objects that have the same weight exactly when they are at the same temperature, then when one object is heated, it will weigh more.

Hope this helps :)

-ilovejiminssi♡

Answer:

2.4%

Explanation:

The strawberry DNA looks like snot under a microscope. Strawberry DNA will look like a stringy white substance. But if you carefully stretch it out you can see more of the details of those strands of DNA.

Ripe strawberries are an excellent source for extracting DNA because they are easy to pulverize and contain enzymes called pectinases and cellulases that help to break down cell walls. And most important, strawberries have eight copies of each chromosome (they are octoploid), so there is a lot of DNA to isolate.

Deoxyribonucleic acid extracted from cells has been variously described as looking like strands of mucus; limp, thin, white noodles; or a network of delicate, limp fibers. Under a microscope, the familiar double-helix molecule of DNA can be seen.

It lives in a cells nucleus in pairs called chromosomes. Humans have 46 chromosomes arranged in 23 pairs.

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Latent heat of fusion for ice is 33600J/k

Heat absorbed

The equation below is photosynthesis .

6CO₂ + 6H₂O → \(C_{6} H_{12} O_{6}\) + 6O₂

Water and carbon dioxide are converted into food by the process of photosynthesis , which occurs in the presence of sunlight in plants and photosynthetic bacteria . They create oxygen as a byproduct and glucose as the food . The photosynthesis equation is given as ,

6CO₂ + 6H₂O → \(C_{6} H_{12} O_{6}\) + 6O₂

This indicates that the reactants, six carbon dioxide molecules and six water molecules, are transformed into a sugar molecule and six oxygen molecules, the products, by light energy being absorbed by chlorophyll (implied by the arrow).

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The question is incomplete, the complete question is;

The Lewis representation above depicts a reaction between hydrogen (blue) and a main-group element from group______ (red).

In this representation, each Y atom needs ______ electron(s) to complete its octet, and gains these electrons by forming______ bond(s) with atoms of H .

There are ______ unshared electron pair(s) and _______bonding electron pair(s) in the product molecule.

The bonds in the product are _________ (Ionic or Covalent)

Answer:

1) 16

2) 2 electrons

3) 2 bonds

4) 2 unshared pairs of electrons

5) 2 bonding pairs of electrons

6) The bonds in the product are covalent

Explanation:

Group sixteen elements have six electrons on their outermost shell. These include two unshared pairs of electrons and two unpaired electrons. These two unpaired electrons can now be covalently bonded to two hydrogen atoms to give H2Y. The compound H2Y has two lone pairs and two bond pairs of electrons.

H2Y can be a general formula for all hydrides of group 16. They are all very similar in structure but gradually differ in physical and chemical properties according to the graduated variation observed down the group.

The molecule has been \(\rm H_2Y\), where the two bonds have been formed for the sharing of 2 electrons pair between the H and Y atom.

The main group element that has the ability to form \(\rm H_2Y\) type of structure has been Group 16.

The atom required 2 electrons to complete its octet, and in order to gain two electrons, the atom form 2 bonds with the H, resulting in \(\rm H_2Y\).

The atom forms bond with the two H atoms, thus there has been the presence of two unshared electrons pair. The bonding electrons pair are also two in the molecule.

The bond has been formed with the sharing of the electron pair. Thus it has been a covalent bond.

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An investigation into an unknown object in space resulted in the following observations: It was discovered to be an asteroid, It revolves around the sun, which is in the third position.

It is a small, rocky substance that rotates around the sun and is found in the asteroid belt, which is located between the orbits of Mars and Jupiter, and its size varies, with some still in fragments and others having a large structure.

Hence, an investigation into an unknown object in space resulted in the following observations: It was discovered to be an asteroid, It revolves around the sun, which is in the third position.

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Answer:

chemical is fire

and ductility is physical

Explanation:

give me brainliest please

The ΔHvap of ethyl acetate in the given conditions is 35.08 kJ/mol.

Enthalpy of vaporization:

To find the ΔHvap (enthalpy of vaporization) of ethyl acetate in kJ/mol, you can use the Clausius-Clapeyron equation, which is:

ln(P1/P2) = (ΔHvap/R) * (1/T2 - 1/T1)

Given:
Normal boiling point (T2) = 77°C = 350.15 K (converting to Kelvin by adding 273.15)
Vapor pressure at 20°C (P1) = 73 Torr
Temperature at P1 (T1) = 20°C = 293.15 K (converting to Kelvin)
P2 = 760 Torr (normal atmospheric pressure at boiling point)
R = 8.314 J/(mol*K) (universal gas constant)

First, plug the values into the equation:

ln(73/760) = (ΔHvap/8.314) * (1/350.15 - 1/293.15)

Now, solve for ΔHvap:

ΔHvap = 8.314 * (ln(73/760) / (1/350.15 - 1/293.15))

ΔHvap ≈ 35079 J/mol (rounded to the nearest whole number)

Finally, convert ΔHvap to kJ/mol:

ΔHvap ≈ 35.08 kJ/mol (rounded to two decimal places)

So, the ΔHvap of ethyl acetate is approximately 35.08 kJ/mol.

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Answer:

Advantages of tidal energyRenewable.

Tidal energy is a renewable source of energy, which means the energy doesn’t deplete as it is used. …

 Zero carbon emissions. In addition to being a renewable energy source, tidal power stations do not emit greenhouse gasses during electricity generation. … Predictable. … High power output.

Explanation:

Dealing with a radical in the denominator can be challenging, but with the right strategies, it is possible to simplify the fraction. The first step is to factor the denominator and try to remove any common factors that can be taken out.

This is done to simplify the fraction as much as possible. The next step is to use conjugates to eliminate the radical in the denominator. A conjugate is a pair of numbers that multiply to give the same result. In this case, the conjugate of the denominator is added to both the numerator and denominator to cancel out the radical.

Another strategy is to multiply the fraction by a fraction with a radical in the numerator, so that the radical cancels out in the denominator. This method is called rationalizing the denominator. It can also be done by multiplying the fraction by the conjugate of the denominator.

Finally, it is important to simplify the fraction as much as possible and make sure that there are no radicals in the denominator. The fraction should be written in its simplest form. If the fraction cannot be simplified any further, it can be left as is.

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Hi! Solubility of materials in water depends on several factors, including polarity, intermolecular forces, and lattice energy. Here's an explanation with the terms you've requested:

1. Polarity: Water is a polar molecule, meaning it has a positive and negative end due to uneven distribution of electrons. Polar substances dissolve well in water (like dissolves like). Molecular solids with polar molecules will generally be soluble in water.

2. Intermolecular forces: There are various intermolecular forces, such as hydrogen bonding, dipole-dipole interactions, and London dispersion forces. Solids with intermolecular forces that are compatible with water's polarity will dissolve more readily.

3. Lattice energy: Molecular solids have a lattice structure, and the energy required to break this lattice determines their solubility. If the energy gained from solvation (interaction with water molecules) is greater than the lattice energy, the solid will dissolve.

Petroleum is insoluble in water because it is nonpolar and mostly consists of hydrocarbon molecules. These molecules have weak London dispersion forces and are not attracted to water's polar nature. Consequently, petroleum doesn't dissolve in water.

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Answer:

Calcium

Explanation:

The number of protons is the atomic number of the element. Number 20 on the periodic table is Calcium.

The passage suggests that the nucleus of a hydrogen atom is responsive to external magnetism.

The passage implies that the nucleus of a hydrogen atom is similar to a bar magnet in its responsiveness to external magnetism. Just like a bar magnet, the nucleus of a hydrogen atom can be influenced or affected by external magnetic fields.

This suggests that the nucleus possesses some inherent magnetic properties, making it susceptible to magnetic forces from its surroundings. Hydrogen atoms consist of a single proton in their nucleus, which carries a positive charge.

The proton, like a tiny magnet, generates a magnetic field due to its spin and charge. This property allows the nucleus to interact with external magnetic fields. When exposed to an external magnetic field, the nucleus aligns itself either parallel or anti-parallel to the field, depending on its orientation.

This responsiveness to external magnetism has significant implications in various fields of science. It forms the basis for nuclear magnetic resonance (NMR), a technique widely used in chemistry, physics, and medicine for studying molecular structures and analyzing chemical environments.

In NMR spectroscopy, the behavior of hydrogen nuclei in a sample is manipulated and measured using external magnetic fields, providing valuable insights into the sample's composition and properties.

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The two lobes shows the p orbital. This is the first image that was shown in the options.

The shape of the p orbital is described as figure-eight shaped. It has two lobes of electron density on either side of the nucleus with a node at the center. The p orbital can point along any of the three mutually perpendicular axes (x, y, z) and each axis is labeled as a different p orbital (px, py, pz). So there are three different p orbitals in an atom.

The orientation of the p orbitals can affect the direction of the bonding in a molecule, making them important in understanding molecular shapes and properties.

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