N2(g) + o2(g) → 2 no(g) δh = +180.7 kj 2 no(g) + o2(g) → 2 no2(g) δh = −113.1 kj 2 n2o(g) → 2 n2(g) + o2(g) δh = −163.2 kj use hess's law to calculate δh for the reaction. n2(g) + 2 o2(g) → 2 no2(g).

This atom is a carbon atom and the sum of its protons and neutrons, each with a mass of approximately 1 atomic mass unit, gives it an atomic mass number of 12.

The atom in question, with six protons, six neutrons, and six electrons, is a carbon atom. In atomic mass units, protons and neutrons each have a mass of approximately 1. Therefore, the approximate atomic mass of this atom, given that electrons contribute minimally to atomic mass due to their very small size, is 12 (6 protons + 6 neutrons = 12). This is also known as the atomic mass number.

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Radioactive decay occurs when an unstable isotope emits radiation to transform into a more stable nuclide. This process releases energy, and possibly mass, and it involves various types of emissions such as alpha, beta, and gamma decay. Each isotope has a specific half-life, the period needed for half of the isotope's atoms to decay.

During radioactive decay, an unstable isotope, also known as a radioisotope, changes spontaneously into another nuclide. This process occurs because the nuclei that are not within the band of stability are unstable and tend to achieve a more stable state. The transformation involves the release of energy and sometimes mass, as the atom's nucleus emits radiation to become more stable.

There are various types of radioactive decay, such as alpha, beta, and gamma decay. Each of these changes the composition of the original nucleus, known as the parent nuclide, resulting in a daughter nuclide. The daughter nuclide could be stable or might further decay if it is still outside the band of stability. An example of this decay process is Carbon-14, which decays into Nitrogen-14, a stable product.

In nuclear reactions, significant amounts of energy are released, which are much greater than the energies involved in chemical reactions. Furthermore, nuclear reactions, and thus radioactive decay, occur regardless of environmental conditions such as temperature and pressure. Each radioisotope has a characteristic half-life, the time required for half of its atoms to decay.

Pizza is a heterogeneous mixture because the different components are not evenly distributed throughout the mixture.

Pizza is a heterogeneous mixture. A heterogeneous mixture is a mixture in which the components are not evenly distributed throughout the mixture. This means that the different components of pizza, such as the sauce, cheese, and toppings, can be easily distinguished from each other.

Pizza is not an element, because an element is a pure substance that cannot be broken down into simpler substances by chemical means. Pizza is also not a compound, because a compound is a substance that is made up of two or more elements that are chemically bonded together.

The components of pizza are not chemically bonded together, so they can be easily separated. For example, the cheese can be removed from the pizza, and the sauce can be removed from the pizza. This shows that pizza is a heterogeneous mixture.

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The balance between pressure cause heat and gravity caused by the stars mass

Explanation:

Relation between pH and concentration of hydrogen ions is as follows.

                  pH = [tex]-log [H^{+}][/tex]

So, it means that an increase in the value of pH will show that there occurs a decrease in concentration of hydrogen ions.

Therefore, the solution becomes basic in nature.

On the other hand, a decrease in the value of pH will show that there occurs an increase in the concentration of hydrogen ions.

Therefore, the solution becomes more acidic in nature.

Hence, if the pH of a solution is decreased from pH 8 to pH 6 it means that the concentration of hydrogen ions has increased in the solution.

If the pH of a solution is decreased from pH 8 to pH 6 it means that the concentration of hydrogen ions in the solution has been increased while the concentration of OH ions have been decreased.

That is;

pH = -Log [H+]

That is;

pOH =-Log[OH-]

Additionally;

pH + pOH = 14

Keywords: Acids, bases, pH, pOH

Level; High school

Subject: Chemistry

Topic: Acids and bases

Sub-topic; pH and pOH

Answer : 49.45 kJ per gram.

Explanation:

Heat of combustion is the amount of heat released on complete combustion of 1 mole of substance.

Given :

Amount of heat released on combustion of butane = 2874 kJ/mol

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

1 mole of [tex]C_4H_{10}[/tex] weighs = 58.12 g

Thus we can say:

58.12 g of [tex]C_4H_{10}[/tex] on combustion releases = 2874 kJ

Thus 1 g of [tex]C_4H_{10}[/tex] on combustion releases =[tex]\frac{2874}{58.12}\times 1=49.45 kJ[/tex]

Thus the heat of combustion of butane, in kJ per gram is 49.45.

Answer: The mass of chloroform is 75 grams.

Explanation:

To calculate density of a substance, we use the equation:

[tex]Density=\frac{Mass}{Volume}[/tex]

We are given:

Density of chloroform = [tex]1.5g/cm^3[/tex]

Volume of chloroform = [tex]50cm^3[/tex]

Putting values in above equation, we get:

[tex]1.5g/cm^3=\frac{\text{Mass of chloroform}}{50cm^3}\\\\\text{Mass of chloroform}=75g[/tex]

Hence, the mass of chloroform is 75 grams.

Answer:

1

Explanation:

a p e x :)

25% is made of cinnamon flavour

Answer: The mass of aluminium hydroxide obtained is 14.196 grams.

Explanation:

To calculate the number of moles, we use the equation:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]    .....(1)

Given mass of aluminium sulfide = 13.7 g

Molar mass of aluminium sulfide = 150.158 g/mol

Putting values in equation 1, we get:

[tex]\text{Moles of sodium}=\frac{23g}{150.158g/mol}=0.091mol[/tex]

The chemical reaction of aluminium sulfide with water follows the equation:

[tex]Al_2S_3+6H_2O\rightarrow 2Al(OH)_3+3H_2S[/tex]

By Stoichiometry of the reaction:

1 mole of aluminium sulfide produces 2 moles of aluminium hydroxide.

So, 0.091 moles of aluminium sulfide will produce = [tex]\frac{2}{1}\times 0.091=0.0182mol[/tex] of aluminium hydroxide.

To calculate the mass of aluminium hydroxide, we use equation 1:

Moles of aluminium hydroxide = 0.0182 moles

Molar mass of aluminium hydroxide = 78 g/mol

Putting values in equation 1, we get:

[tex]0.0182mol=\frac{\text{Mass of aluminium hydroxide}}{78g/mol}\\\\\text{Mass of aluminium hydroxide}=14.196g[/tex]

Hence, the mass of aluminium hydroxide obtained is 14.196 grams.

Final answer:

The compound C6H12O6 is glucose, consisting of 6 carbon atoms, 12 hydrogen atoms, and 6 oxygen atoms. Its empirical formula is CH₂O, representing a 1:2:1 ratio.

Explanation:

The question is related to the molecular composition of a compound with the formula C6H12O6, which is glucose. In this formula, the numbers indicate the quantity of each type of atom present in a single molecule of glucose. There are 6 carbon atoms (C), 12 hydrogen atoms (H), and 6 oxygen atoms (O). The empirical formula of glucose, which represents the simplest whole-number ratio of the atoms, is CH₂O indicating a 1:2:1 ratio for C:H:O.

To find the molecular and empirical formulas of the compound, we can analyze the ratio of atoms by considering the molecular or molar mass. Using glucose as an example, we understand that (CH₂O)6 equals C6H12O6, demonstrating the relationship between the empirical and molecular formulas. This approach is equally valid when dealing with molar mass (g/mol) rather than molecular mass (amu).

1) Electronegativity is A) how strongly an atom pulls electrons to itself when it is bonded to other atoms. 2) D. Cl has the highest electronegativity. 3) B. Sr has the lowest electronegativity.

4) C) Li, C, N, O, F is the correct order  of elements from lowest to highest electronegativity. 5) B. False, Electronegativity increases from left to right across a period and decreases from top to bottom of a group.

Understanding Electronegativity in Chemistry

The orbit of a planet around the Sun is best described as an ellipse with the Sun at one focus, in line with Kepler's First Law. Planetary motion is further described by Kepler's Second and Third Laws.

Based on Kepler's work, the best description of the orbit of a planet around the Sun is an ellipse with the Sun at one focus. This statement is in accordance with Kepler's First Law of Planetary Motion. Furthermore, Kepler's Second Law also states that each planet moves so that an imaginary line drawn from the Sun to the planet sweeps out equal areas in equal times, emphasizing the dynamical aspect of planetary motion. Lastly, Kepler's Third Law establishes that the ratio of the squares of the periods of any two planets is proportional to the ratio of the cubes of their average distances from the Sun, which is a foundational law in understanding the motion of celestial bodies within our solar system.

The orbital period of Deimos, one of Mars' moons, is not provided directly in the question, but it can usually be found in detailed astronomical datasets or scientific literature.

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The physical property is characteristic of matter that is independent of its chemical composition. Examples of physical properties are density, hardness, color, electrical conductivity, and melting and boiling points.

The matter is composed of tiny particles known as atoms and can be represented as something that occupies space. It must represent both the mass and volume properties.

Properties are the features that capable us to differentiate one material from another. A physical property is a characteristic of matter that does not depend on its chemical composition.

For example, color, hardness, density, melting points, electrical conductivity, etc.

Any properties of matter that can be measured, such as density, color, length, mass, volume, melting point, malleability, hardness, odor, and temperature are considered properties of matter. The physical properties of matter can be intensive or extensive. Intensive properties are independent of the amount of matter while extensive properties depend upon the quantity of matter.

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Phosphorus has 5 valence electrons, Barium needs to give up 2 electrons to achieve a noble gas configuration, and Fluorine does not form an ion with a 1+ charge.

The atom of phosphorus, with an atomic number of 15, has 5 valence electrons. We mostly determine the number of valence electrons from an element's position in the periodic table. The elements in group 15, including Phosphorus, have 5 valence electrons.

Barium, with two valence electrons, needs to give up 2 electrons to obtain a noble-gas electron configuration. It is a group II element in the periodic table and thereby has two valence electrons which it will readily give up to achieve stability.

Out of the given options, fluorine does not form an ion with a 1+ charge. It is located in group 17 in the periodic table (halogens) and forms a 1- ion instead. It does so by gaining one electron to complete its valence shell and achieve a stable, noble-gas configuration.

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Apply Graham's law of effusion to compare the rates of effusion of Nitrogen gas (N₂) and Chlorine gas (Cl₂) and calculate the time it would take for the same volume of Cl₂ as N₂ to effuse.

The question is asking about the concept of effusion from the field of Chemistry, which refers to how quickly gases escape through a small hole. The rate of effusion for gases can be calculated using Graham's law of effusion, which states that the rate of effusion of a gas is inversely proportional to the square root of its molar mass.

In this case, the student is asking how long it would take for the same volume of Cl₂ as N₂ to effuse. Given that the molar mass of nitrogen (N₂) is approximately 28 g/mol and that of chlorine (Cl₂) is approximately 70 g/mol, we can use these values in the relation (Rate of N₂ / Rate of Cl₂) = sqrt(Molar mass of Cl₂ / Molar mass of N₂). We're told that the rate of N₂ is 255s. Hence, by inserting these values into the relation, we can find the effusion rate of Cl₂.

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yeah the answer is gold