calculate the standard entropy change for the reaction at 25 °c. standard molar entropy values can be found in this table. c3h8(g) 5o2(g)⟶3co2(g) 4h2o(g) δ∘rxn= 165.7 j/k

Answer:

we know, at STP ( standard temperature and pressure).

we know, volume of 1 mole of gas = 22.4L

weight of 1 Litre of hydrogen gas = 0.09g

so, weight of 22.4 litres of hydrogen gas = 22.4 × 0.09 = 2.016g ≈ 2g = molecular weight of hydrogen gas.

similarly,

weight of 2L of a gas = 2.88gm

so, weight of 22.4 L of the gas = 2.88 × 22.4/2 = 2.88 × 11.2 = 32.256g

hence, molecular weight of the gas = 32.256g

vapor density = molecular weight/2

= 32.256/2 = 16.128g

hence, vapor density of the gas is 16.128g.

Explanation:

To determine the molarity of H2SO4 in the solution, we first need to calculate the number of moles of H2SO4 present in 68.32 g of the compound.

The molar mass of H2SO4 is:

2(1.008 g/mol) + 32.06 g/mol + 4(16.00 g/mol) = 98.08 g/mol

So, the number of moles of H2SO4 is:

68.32 g / 98.08 g/mol = 0.696 mol

Next, we need to convert the volume from mL to L:

500 mL = 0.5 L

Finally, we can calculate the molarity using the formula:

Molarity = moles of solute / volume of solution in liters

Molarity = 0.696 mol / 0.5 L = 1.392 M

Therefore, the molarity of 68.32 g of H2SO4 in 500 mL of solution is 1.392 M.

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Answer:

Explanation:

The grass hopper feeds on the plants so the secondary consumer lacking its food source would decrease as the producer increases with not predator.

Answer:

Es so es na formula pero te balto la convinasiones de la formula

Answer:

The temp is 176k

Explanation:

Sparrows with average-sized wings survive severe storms better than those with longer or shorter wings illustrates Stabilizing selection.

Stabilizing selection is a natural selection in which stabilized traits are selected rather than any extreme traits by the nature. Nature do not favors any drastic change in the traits over the years.

Stabilizing selection is often confused with or misunderstood as negative or purifying selection.

Stabilizing selection favors intermediate variants promoting survival of the species.

Average phenotype is selected and continuously dominates in coming generations.

This natural selection helps species to adapt stable phenotype for better survival rate.

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The relative ability of a bonded atom to attract shared electron pairs is called its electronegativity. This ability increases as the size of the atom decreases because for a smaller atom the shared electrons will be closer to the nucleus.

A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms. These electrons are simultaneously attracted to two nuclei.

Electronegativity is defined as the ability of an atom within a molecule to attract electrons to itself. The concept of an elemental electronegativity scale was proposed by Pauling.

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The probability that the sample mean amount contained is less than 42.945 grams is 0.41 or 41%.

In this question, we need to use the concept of the sampling distribution of the mean. We know that the energy bar's mean amount contained is 43 grams with a standard deviation of 0.5 grams. If a sample of 4 energy bars is selected, we want to find the probability that the sample mean amount contained is less than 42.945 grams.

The sample size is 4, which is considered a small sample. Hence, we cannot use the normal distribution and instead will use the t-distribution. To find the t-score, we can use the following formula:

\($$t = \frac{\bar{x} - \mu}{s/\sqrt{n}}$$\)

where \($\bar{x}$\) is the sample mean,

\($\mu$\) is the population mean,\($s$\) is the sample standard deviation,

and\($n$\)is the sample size. Substituting the given values,

we get\(:$$t = \frac{42.945 - 43}{0.5/\sqrt{4}}$$\)

Simplifying this, we get:\($$t = \frac{-0.055}{0.25} = -0.22$$\)

Using a t-distribution table with 3 degrees of freedom (n - 1), we find that the probability of getting a t-score less than -0.22 is approximately 0.41.

Therefore, the probability that the sample mean amount contained is less than 42.945 grams is 0.41 or 41%.

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Triacylglycerols are the major form of stored energy instead of glucose because they have a higher energy density due to their hydrophobic nature, they can be easily transported in the blood serum, and they yield more energy per carbon upon oxidation compared to glucose.

Triacylglycerols are more advantageous as a stored energy form compared to glucose for multiple reasons. Firstly, triacylglycerols have a higher energy density because of their hydrophobic nature. They are not solvated by water and therefore have less mass per unit volume, allowing for more energy to be stored in the same volume.

Secondly, triacylglycerols are highly soluble in blood serum, enabling efficient transportation to different parts of the body where energy is needed. This solubility facilitates the mobilization and delivery of stored energy to meet metabolic demands.

Lastly, the fatty acids in triacylglycerols are at a higher reduction state compared to glucose. This higher reduction state means that fatty acids yield more energy per carbon upon oxidation. Thus, the oxidation of fatty acids in triacylglycerols provides a greater amount of energy compared to the oxidation of glucose, making them an efficient energy source for the body.

Overall, the combination of higher energy density, easy transportability, and greater energy yield per carbon make triacylglycerols the preferred form of stored energy in the body compared to glucose.

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Answer:

This took forever T-T

Explanation:

1. The condition of the soil has a big impact on the environment. Good soil helps plants grow, supports different kinds of life, and prevents erosion. It also keeps nutrients in balance and affects the quality of water and air. If the soil is unhealthy or polluted, it can harm plants, animals, and the overall ecosystem.

2. The dodo bird is an example of a species that no longer exists. It used to live on an island called Mauritius. Sadly, people hunted the dodo bird for food and destroyed its habitat. They also introduced other animals that harmed the dodo bird's population. Because of these reasons, the dodo bird became extinct. This affected the environment because the dodo bird played a role in spreading seeds and helping plants grow.

3. The Sumatran orangutan is a species in danger of disappearing. Its biggest threats are losing its home due to forests being cut down for palm oil, illegal hunting, and being taken as pets. People are working to protect the orangutans by preserving their habitat, rescuing and rehabilitating them, and educating communities about their importance.

4. Central Park in New York City is a natural area created in 1857. It was made for people to enjoy nature in the middle of the city. People can do many outdoor activities there like walking, picnicking, and playing sports. The park is also home to various birds and animals, which adds to the city's biodiversity.

5. When a certain environment, like a forest or a desert, is damaged or in danger, it has a big impact on the whole ecosystem. Many different plants and animals depend on each other in these environments. If something harms or destroys their homes, it can lead to the loss of species, disruption of food chains, and less diversity. It can also affect important processes like water and carbon cycles, and even influence the climate. People who rely on these environments for resources and livelihoods are also affected. That's why it's important to protect and take care of these natural areas.

Answer: d

Explanation:

The formation of a positive ion by lithium is characteristic of alkali metals, which generally have low ionization energies, making it easier for them to lose electrons and acquire a stable configuration.

Lithium (Li) is located on the periodic table in Group 1, Period 2. Group 1 elements are known as the alkali metals, which are found in the first column on the left-hand side of the table. Period 2 refers to the second horizontal row from the top. Lithium is the first element in this row and has an atomic number of 3.

In terms of ion formation, lithium will typically form a positive ion, or cation, by losing one electron. The electronic configuration of lithium is 1s² 2s¹, meaning it has two electrons in the first energy level (K shell) and one electron in the second energy level (L shell).

In order to achieve a stable electron configuration, lithium will readily lose its single valence electron in the 2s orbital to attain the electron configuration of helium (1s²) with a completely filled K shell. As a result, lithium forms the Li+ ion, which has a charge of +1 due to the loss of the negatively charged electron.

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The statement "a glycosidic bond is a bond between the anomeric carbon of a carbohydrate and any other biological molecule" is true.A glycosidic bond is a type of covalent bond that forms between the anomeric carbon of a carbohydrate molecule and another molecule, such as another carbohydrate, a protein, or a lipid.

The anomeric carbon is the carbon atom in a carbohydrate molecule that was involved in the formation of the carbonyl group (C=O) during the cyclization of the sugar. The anomeric carbon can exist in two different configurations, alpha or beta, depending on the orientation of the hydroxyl group (-OH) attached to it. When the anomeric carbon reacts with another molecule, such as an alcohol or amine group of another carbohydrate, a glycosidic bond is formed.

Glycosidic bonds are important in the formation of complex carbohydrates, such as starch, glycogen, and cellulose, as well as in the synthesis of glycoproteins and glycolipids. The type of glycosidic bond formed between two carbohydrates can have significant implications for their biological function and the properties of the resulting molecule.

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To determine which element is oxidized and which is reduced in a redox equation, you need to look at the change in oxidation states of each element.

The element that has a decrease in oxidation state is being reduced, while the element that has an increase in oxidation state is being oxidized.

For example, in the equation \(Cu + 2AgNO_3 \rightarrow Cu(NO_3)2 + 2Ag\), copper \((Cu)\) is being oxidized from an oxidation state of \(0 to +2\), while silver \((Ag)\) is being reduced from an oxidation state of \(+1 $ to 0\). Therefore, \(Cu\) is the oxidizing agent and Ag is the reducing agent in this equation.

To determine which element is oxidized and which is reduced in a redox equation, follow these steps:

So, in the example redox equation \(Zn(s) + Cu^{2} +(aq) \rightarrow Zn^{2} +(aq) + Cu(s)\), the element \(Zn\) is oxidized and the element \(Cu\) is reduced.

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The final temperature of the coffee in the thermos will be a result of the heat transfer between the coffee and the melting ice cubes.

When the ice cubes are dropped into the thermos containing coffee, heat transfer occurs between the two substances until they reach thermal equilibrium. The heat transfer process involves the transfer of heat from the coffee to the ice cubes, causing them to melt.

To calculate the final temperature, we can use the principle of conservation of energy. The heat gained by the ice cubes equals the heat lost by the coffee.

First, let's calculate the heat gained by the ice cubes. The specific heat capacity of ice is approximately 2.09 J/g°C. Since each ice cube weighs 11 g and starts at 0°C, the heat gained by the ice cubes is:

Q_ice = (mass_ice) x (specific heat capacity_ice) x (change in temperature)

= (11 g) x (2.09 J/g°C) x (final temperature - 0°C)

Next, let's calculate the heat lost by the coffee. The specific heat capacity of coffee is assumed to be the same as water, which is approximately 4.18 J/g°C. The initial temperature of the coffee is 85°C, and its volume is 150 cm³. Using the density of water (1 g/cm³), we can find the mass of the coffee

mass_coffee = (density_water) x (volume_coffee)

= (1 g/cm³) x (150 cm³)

Q_coffee = (mass_coffee) x (specific heat capacity_coffee) x (final temperature - 85°C)

Since the heat gained by the ice cubes is equal to the heat lost by the coffee, we can set up the equation:

Q_ice = Q_coffee

Substituting the respective values and solving the equation will give us the final temperature of the coffee.

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Answer:

Since macromolecules are generally made up of many smaller molecules and atoms, they are referred to as polymers. Polymers are made up of smaller units known as monomers. The macromolecules of life are: carbohydrates.

Explanation:

The identity of the gas is hydrogen (H2).The average kinetic energy of gas molecules is directly proportional to the temperature. Using the formula for kinetic energy (KE = (1/2)mv^2), we can equate the kinetic energy of the unknown gas (Z) at 250K to that of hydrogen (H2) at 500K.

Since the average velocity is proportional to the square root of the kinetic energy, we can set up the following equation:

(1/2)mz(vz^2) = (1/2)mh(vh^2)

Given that mz is the molar mass of gas Z and mh is the molar mass of hydrogen (2 g/mol), and vz is the velocity of gas Z at 250K, and vh is the velocity of hydrogen at 500K.We can simplify the equation by canceling out the common factors:

mz(vz^2) = mh(vh^2)

The gas with an average velocity equal to hydrogen at twice the temperature is hydrogen gas itself (H2).

Since the average velocity of gas Z is equal to the average velocity of hydrogen at twice the temperature, the molar mass of gas Z must be half of the molar mass of hydrogen.

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There are two properties that can be used to identify an element: the atomic number or the number of protons in an atom. The number of neutrons and number of electrons are frequently equal to the number of protons, but can vary depending on the atom in question.

Interhalogen compounds that contain fluorine are very active fluorinating agents, which means they are capable of transferring fluorine atoms to other substances. These compounds are exceedingly reactive, making them useful for a variety of chemical reactions. They are also powerful oxidizing agents, meaning that they can facilitate the loss of electrons from other substances, which can lead to the formation of new compounds. Additionally, interhalogen compounds can contain halogens in both positive and negative oxidation states, depending on the specific compound. Therefore, the correct answer to your question is "all of the above."

Interhalogen compounds are compounds that are formed between two different halogen atoms, such as chlorine, fluorine, bromine, iodine, etc. These compounds have a general formula of XYn, where X and Y represent two different halogens and n can be 1, 3, 5, or 7 depending on the number of atoms of each halogen in the molecule.

Interhalogen compounds are typically more reactive than the individual halogens from which they are derived. This is due to the differences in electronegativity between the two halogens, which can lead to the formation of polar bonds and the creation of partial charges within the molecule. As a result, interhalogen compounds can react with a wide range of other substances, including metals, non-metals, and even water.

There are several different types of interhalogen compounds, including dihalogens, trihalogens, and pentahalides. Examples of interhalogen compounds include chlorine trifluoride (ClF3), bromine pentafluoride (BrF5), and iodine heptafluoride (IF7). These compounds have a wide range of industrial and research applications, including as oxidizing agents, fluorinating agents, and catalysts.

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The industrial methods of preparing alcohol that is more economical is fermentation.

Fermentation is defined as the industrial method by which starch is converted to ethyl alcohol by using some specific enzymes and microorganisms known as yeast

It is an economical method because the raw material which is starch is readily available.

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Anna-Kat was replaced on American Housewife due to a recasting decision. This change was made primarily because Julia Butters, who played Anna-Kat, left the show to pursue other opportunities.

In the show American Housewife, the character Anna-Kat Otto was initially portrayed by Julia Butters. However, after three seasons, Butters left the series to focus on a film career, including a role in Quentin Tarantino's Once Upon a Time in Hollywood. As a result, the producers decided to recast the role with actress Giselle Eisenberg for the fourth season. Recasting is not uncommon in television shows, and it's usually done when an actor becomes unavailable or chooses to pursue other projects. In this case, the decision was made to maintain continuity in the story and the character's development.

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There are two types of chemical compound one is covalent compound and another is ionic compound in chemistry. In ionic bonds, electrons are completely transferred. The correct option is option C.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

Covalent compounds are formed by covalent bond and ionic compounds are formed by ionic bond. Covalent bond is formed by sharing of electron and ionic bond are formed by complete transfer of electron. Ionic bonds are stronger than covalent bonds. The melting and boiling points are higher in ionic compounds.

Ionic bonds are formed by elements whose electronegativity difference is very large. Since K has high electronegativity among all given elements so K is most likely to react with Br.

Therefore, the correct option is option C.

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Answer:

The H+ concentration would decrease by 10 fold. From .01 to .001

Explanation:

This is due to how a pH of 2 is expressed in scientific notation as 10^-2 power when referring to H+ concentration so a pH of 3 would be 10^-3. Hence it would be 10 times smaller in concentration as the power increases to the negative power the smaller the concentration becomes.

To predict the product of a chemical reaction, one can use the chemical equation and the Law of Conservation of Mass to balance the equation and determine the products.

Using the chemical equation and the Law of Conservation of Mass to balance the equation and determine the products.

Using the knowledge of common chemical reactions and patterns, such as acid-base reactions, oxidation-reduction reactions, and neutralization reactions.

Using the reactivity of the reactants and the conditions of the reaction, such as temperature and catalysts, to predict the products.

Another way is to use the knowledge of common chemical reactions and patterns, such as acid-base reactions, oxidation-reduction reactions, and neutralization reactions. These reactions follow a set pattern and the products can be predicted by understanding these patterns.

The reactivity of the reactants and the conditions of the reaction, such as temperature and catalysts, also play a crucial role in predicting the products. A change in conditions can lead to a change in the products of a reaction.

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The mass of Hg in the sample is 17.1g.

One of the fundamental quantities in physics and the most fundamental feature of matter is mass. The quantity of matter in a body is referred to as its mass. The kilogram, the standard international unit of mass (kg). You can write the mass formula as follows:

Mass = Density × Volume

The water weighs 1400 g. And one night later, we grew by one. Therefore, multiplying X 12.2 by 1400 multiplied by a million. We therefore possess 0.01708 grammes of mercury. When converted to milligrams, this amount equals 17.1 milligrams of mercury.

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Fog remains suspended in the air because they are supported by slight movement in the air

If the air near the ground cools down enough and is humid and light wind (stable), water vapour in the air may condense into minute water droplets. Near ground level, these raindrops make it harder to see. Fog is the term for the phenomenon.

Fog is defined as "air that is near to the surface and contains suspended water droplets, typically generated by diabatic cooling" in Understanding Weather and Climate.

When the air close to the ground cools down sufficiently, the water vapor condenses into liquid water or ice, creating fog. Fog comes in a wide variety of forms. When the air close to the ground is chilly enough, ice fog develops.

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Platinum catalyst is remoted from ores or recycled from residues because it indicates very excessive catalytic activity.

To recognise approximately Catalyst

Catalysts permit chemical reactions to take area that in any other case could best take area slowly, and in a few times so slowly they could successfully now no longer take area in any respect withinside the absence of a catalyst. Platinum changed into the primary heterogeneous catalyst to be discovered, and all the platinum organization metals display very excessive catalytic activity.

Like many platinum compounds, chloroplatinic acid is a catalyst for hydrogenation. Upon remedy with an ammonium salt, consisting of ammonium chloride, chloroplatinic acid converts to ammonium hex chloroplatinate, which precipitates as a solid.

Upon heating In an surroundings of hydrogen, the ammonium salt converts to elemental platinum. Platinum is frequently remoted from ores or recycled from residues the use of this method

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