what do carbon dioxide and methane do for our atmosphere?

Answer:

oxygen friend

Explanation:

It is generally believed that the Earth's atmosphere did not contain oxygen until around 2500 million years ago (Mya) when oxygen-evolving photosynthetic bacteria arose. At around 800–500 Mya, the oxygen concentration increased sharply to reach the 21% we have today. So, it seems highly likely that life arose as anaerobic organisms, which then evolved to tolerate oxygen and finally, to use it as a terminal acceptor for the energy-producing oxidative processes in the respiration of aerobic bacteria and mitochondria in eukaryotic cells. The respiratory processes employed by typical aerobic organisms today have a wide range of mechanisms to deal with the troublesome side effects of living with a high oxygen concentration.

The experimental molar mass of CO2 collected in a laboratory experiment is 44.0 g/mol.

When carrying out laboratory experiments, carbon dioxide gas is collected to determine the molar mass of the compound. When a 500 mL flask was filled with the evolved CO2 at 294 K and 1.01 atm, 1.008 grams of CO2 was collected. It is required to determine the experimental molar mass of CO2. To solve the problem, we will make use of the ideal gas law formula:

P.V = n.R.T Where,P = 1.01 atmV = 500 mL = 0.500 Ln = number of moles of CO2R = 0.0821 L.atm.K-1.mol-1T = 294 K Substituting the values in the formula, we get;1.01 atm × 0.500 L = n × 0.0821 L.atm.K-1.mol-1 × 294 K1.01 × 0.500 = n × 24.79n = (1.01 × 0.500) / 24.79n = 0.02039 moles of CO2. We know that the mass of CO2 that was collected is 1.008 grams.Therefore, the molar mass of CO2 = mass / number of moles = 1.008 g / 0.02039 mol = 49.38 g/mol

But, we know that CO2 has a molar mass of 44.01 g/mol. Hence, the value of 49.38 g/mol is not the experimental molar mass of CO2 and so, we have to calculate the experimental molar mass of CO2 as follows:Experimental molar mass of CO2 = mass / number of moles = 1.008 g / 0.02039 mol = 49.38 g/mol. Actual molar mass of CO2 = 44.01 g/mol.

Experimental error = | experimental value - actual value | / actual value × 100%.Substituting the values in the formula, we get;

Experimental error = | 49.38 - 44.01 | / 44.01 × 100%

Experimental error = 12.2% ≈ 12%.

Therefore, the experimental molar mass of CO2 is 44.0 g/mol (Option b).

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Answer:

The answer is D - 3.7 L.

Hexane, C6H14, is a non-polar molecule, meaning that its electric charge is evenly distributed. On the other hand, water (H2O) is a polar molecule, with an uneven distribution of electric charge. Since the two molecules have opposite polarities, they do not interact with one another, leading to the nearly insoluble nature of hexane in water.

When explaining, in terms of the molecular polarity, why hexane is nearly insoluble in water, it's crucial to consider the nature of the molecules, their polarity, and their ability to interact with one another.

Hexane, with the chemical formula C6H14, is a saturated hydrocarbon with a boiling point of 69°C. It's an odorless liquid that's colorless, and it's frequently utilized as a solvent in the laboratory. When hexane molecules are considered, they are all nonpolar molecules, meaning that the electrons are distributed uniformly among the atoms, and there is no permanent charge on any part of the molecule.

Water (H2O) is a polar molecule with a partial positive charge on its hydrogen atoms and a partial negative charge on its oxygen atoms. It's a very common solvent in laboratories because it's extremely polar and can dissolve a wide range of substances. It's because of the difference in the polarity of water and hexane molecules that hexane is nearly insoluble in water.

The reason hexane is insoluble in water is that water is an incredibly polar substance, while hexane is a nonpolar substance. The polar water molecules are attracted to other polar substances and repelled by nonpolar substances like hexane, which has no charge to attract polar water molecules.

Therefore, as a result, hexane does not dissolve in water and is nearly insoluble.

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The complex that will absorb a photon with the lowest energy is [Co(OH)6]3-. The correct answer is option A

Co(OH)6]3- is the complex that absorbs a photon with the lowest energy. It is because of the crystal field effect. The complex [Co(OH)6]3- has the lowest energy for the d-electrons of the cobalt ion. A photon is an elementary particle that forms a light beam. It has a small mass and no charge. A photon has wave-particle duality, which means it exhibits properties of both a wave and a particle. Photons are electromagnetic radiation particles, which means they have both electric and magnetic components.

The lowest energy is defined as the minimum energy that a system can have. It is the energy state that is energetically stable. Photons have energy, and the energy of the photon is directly proportional to its frequency. The energy of a photon can be used to determine the energy of the electron that absorbs it.

A weak field ligand environment means that there is a small energy gap between the t2g and eg orbitals. As a result, it absorbs photons with the lowest energy, according to the spectrochemical series. In comparison to the other complexes, [Co(OH)6]3- has a low-energy gap, which makes it the most stable.

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To determine the limiting reactant, amounts of each product formed, and the amount by which the excess reactant is for a reaction between 12.0 grams of NH₃ and 15.0 grams of O₂, the balanced chemical equation and stoichiometry must be used.

The balanced chemical equation for the reaction between NH₃ and O₂ is:

4NH₃ + 5O₂ → 4NO + 6H₂O

To determine the limiting reactant, the amounts of reactants must be converted to moles. The molar mass of NH3 is 17.03 g/mol and the molar mass of O₂ is 32.00 g/mol.

12.0 g NH₃ × (1 mol NH3/17.03 g NH₃) = 0.705 mol NH

315.0 g O₂ × (1 mol O2/32.00 g O₂) = 0.469 mol O₂

The stoichiometry of the balanced chemical equation indicates that 4 moles of NH₃ reacts with 5 moles of O₂. The mole ratio of NH₃ to O₂ is 4/5 or 0.8. Since the mole ratio of NH₃ to O₂ is greater than the actual mole ratio of 0.705/0.469 or 1.50, NH₃ is the excess reactant and O₂ is the limiting reactant.

To determine the amount of each product formed, the mole ratio of products to limiting reactant must be used. The mole ratio of NO to O₂ is 4/5 or 0.8, and the mole ratio of H₂O to O₂ is 6/5 or 1.2. Since O₂ is the limiting reactant, the amount of NO and H₂O that can be produced is based on the mole ratio to O₂.

0.469 mol O₂ × (4 mol NO/5 mol O₂) × (30.01 g NO/1 mol NO) = 0.601 g NO

0.469 mol O₂ × (6 mol H₂O/5 mol O₂) × (18.02 g H₂O/1 mol H₂O) = 0.674 g H₂O

The amount of excess NH₃ is determined by subtracting the moles of NH₃ used from the moles of NH₃ added.

0.705 mol NH₃ − (0.469 mol O₂ × 4 mol NH₃ / 5 mol O₂) = 0.408 mol NH₃

Thus, the limiting reactant is O₂, 0.601 g NO and 0.674 g H₂O are produced, and there is 0.408 mol of excess NH₃.

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Answer:

A)law of multiple proportions

Explanation:

The new volume of the helium gas sample will be  124 ml. This is due to the fact that when the temperature decreases while the pressure remains constant, the volume of a gas will increase.

According to Charles’s law, the volume of a given gas at a constant pressure is directly proportional to its absolute temperature. Therefore, a decrease in temperature, while holding constant the pressure of the helium gas, would result in a decrease in volume.

A constant pressure is the one under which the pressure of a substance remains unchanged as the temperature and/or volume of the substance change. Charles's law may be used to explain the properties of gases, particularly with constant pressure since it states that the volume of a given mass of a gas is directly proportional to its absolute temperature, provided that its pressure remains constant. It's written as:V1/T1 = V2/T2; whereV1 = 620 ml; T1 = 500K; T2 = 100KLet's put the values in the formula given above. The [tex][tex]620/T1 = V2/100V2 = 62,000/500V2 = 124 ml[/tex].[/tex]Therefore, the new volume of helium gas at a temperature of 100K would be 124 ml.

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Yes, the chemical basis for a metabolic syndrome is the failure of the body to breakdown fatty acids.

Metabolic syndrome is used to describe a collection of health problems that increase the risk of developing other diseases such as diabetes, heart disease, and stroke. The primary cause of metabolic syndrome is obesity, which is why it is frequently referred to as "obesity syndrome."

The syndrome is also linked to other genetic and environmental factors that contribute to insulin resistance, inflammation, and high blood pressure, as well as a failure to break down fatty acids properly in the body. Thus, the chemical basis for metabolic syndrome is the failure to break down the fatty acids in body. This chemical problem can contribute to the development of other fatal diseases and health problems.

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true

Explanation:

Atoms cannot be subdivided, created, or destroyed. Atoms of different elements can combine in simple whole number ratios to form chemical compounds.

Answer:

true

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The additional information necessary is: "the half-life of potassium-40." for the scientist to determine the absolute age of the fossil.

Radiometric dating is a method used to determine the absolute age of rocks and fossils based on the decay of radioactive isotopes. The rate of decay of a radioactive isotope is measured in terms of its half-life, which is the time it takes for half of the original parent atoms to decay into daughter atoms.

In this case, the scientist needs to know the half-life of potassium-40 in order to calculate the absolute age of the fossil. By knowing the half-life of potassium-40, the scientist can determine how much time has elapsed since the fossil was formed based on the proportion of parent and daughter atoms present in the fossil.

Therefore, the correct answer is: the half-life of potassium-40.

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The correct answer is D. [tex]CO_3^{2-}(aq) + H_ 2O(l) \rightleftharpoons  HCO_3^-(aq) + OH^-(aq)[/tex]. This chemical equilibrium equation best shows what happens in the buffer solutions to minimize the change in pH when a small amount of a strong base is added.

Buffer solutions containing [tex]Na_2CO_3[/tex] and [tex]NaHCO_3[/tex] range in pH from 10.0 to 11.0. The chemical equation given represents the equilibrium between [tex]CO_3^{2-}[/tex] and [tex]H_2O[/tex], and the table lists the composition of four different buffer solutions at 25°C. When a small amount of a strong base is added to a buffer solution, the pH will start to increase. This equation helps to minimize the change in pH by shifting the equilibrium so that the concentration of [tex]HCO_3^-[/tex] is increased. This decreases the concentration of [tex]OH^-[/tex] and the pH increases less than it would if the equilibrium had not shifted.

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The correct answer is D.

A strong base is a substance that completely dissociates into its ions in water, producing a high concentration of hydroxide ions (OH-). Similarly, a weak base is a substance that only partially dissociates into its ions in water, producing a low concentration of hydroxide ions (OH-).

The term that completes the analogy is "Weak electrolyte", which is a substance that only partially dissociates into its ions in water and conducts electricity poorly. A strong electrolyte, on the other hand, is a substance that completely dissociates into its ions in water and conducts electricity well.

Therefore, the analogy can be completed as follows:

"Strong base is to weak base as strong electrolyte is to weak electrolyte."

I hope it helped you :)

You need to know the molar mass of calcium chloride in order to calculate the moles of calcium chloride with a mass of 1.11 g. The total atomic masses of all the atoms in a single compound molecule make up the molar mass.

According to its chemical formula, calcium chloride is composed of two chlorine atoms (atomic mass = 35.45 g/mol) and one calcium atom (atomic mass = 40.08 g/mol). As a result, calcium chloride has the following molar mass:

CaCl2 has a molar mass of 110.98 g/mol (40.08 g/mol + 2 x 35.45 g/mol).

The number of moles of calcium chloride having a mass of 1.11 g may be determined using the molar mass of calcium chloride, which we already know. The following is the formula to get the number of moles:

Molar mass divided by mass equals a mole.Substituting the values we know, we get:

moles of CaCl2 = 1.11 g / 110.98 g/mol = 0.01 mol

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The tendency of electrons to enter orbitals of lowest energy first is known as the Aufbau principle. In chemistry, the Aufbau principle is used to predict the ground state of an atom and to understand the electronic structure of elements.

Aufbau principle is the method of building an atom's electronic structure by adding electrons one at a time to the lowest energy orbitals available until all of the electrons have been added.

The lowest-energy orbitals, such as 1s, are filled with electrons first because electrons have the most negative charge and are thus drawn to the positively charged atomic nucleus. Electrons in orbitals of equal energy (such as the three 2p orbitals) must occupy each of them singly before they begin pairing up to form electrons pairs (spin pairing). To avoid filling two orbitals of the same energy with electrons, electrons must fill singly first.

The Aufbau principle governs the order in which orbitals are filled and explains why the electron configuration of each atom is unique.

In a nutshell, the tendency of electrons to enter orbitals of lowest energy first is known as the Aufbau principle.

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Answer:

We can start by finding the amount of iron used in the reaction:

Iron (Fe) is the limiting reagent since it is completely used up in the reaction.

Molar mass of Fe = 55.845 g/mol

Moles of Fe = mass / molar mass = 3.58 g / 55.845 g/mol = 0.064 moles

The balanced chemical equation for the reaction is:

4Fe + 3O2 → 2Fe2O3

From the equation, we can see that 4 moles of Fe react with 3 moles of O2 to produce 2 moles of Fe2O3.

Moles of Fe2O3 produced = mass / molar mass = 5.00 g / (2 x 159.69 g/mol) = 0.01567 moles

Since 4 moles of Fe reacts with 2 moles of Fe2O3, the theoretical yield of Fe2O3 from 0.064 moles of Fe is:

Theoretical yield of Fe2O3 = (0.064 mol Fe) x (2 mol Fe2O3 / 4 mol Fe) x (2 x 159.69 g/mol Fe2O3) = 12.746 g

The percentage purity of iron is:

Percentage purity = (actual yield / theoretical yield) x 100%

Percentage purity = (5.00 g / 12.746 g) x 100% = 39.26% (rounded to two decimal places)

Therefore, the iron wire is 39.26% pure.

The volume of the dry gas at STP when a 32.0 mL sample of hydrogen is collected over water at 20.0 degrees Celsius and 750.0 torr is 31.1 mL.

There is a formula used to calculate the volume of dry gas at STP given a sample of hydrogen gas collected over water at a specific temperature and pressure, which is as follows:

Vd = Vw - Vh2o

Vd = volume of the dry gas, Vw = volume of the wet gas, Vh2o = vapor pressure of water at a given temperature

The next thing is to calculate Vw which is the volume of the wet gas.

Vw = Vtotal - Vh2o

Vtotal = total volume of the gas collected, Vh2o = volume of the water collected

In the question, the volume of the hydrogen gas collected over water at 20.0 degrees Celsius and 750.0 torr is 32.0 mL.

Vh2o = P × V / R × T

where, P = pressure = 17.5 torr, V = volume of the water collected = 0.0 mL (not given)

Vh2o = 0.0 torr × mL / 62.36 (L•torr/K•mol) × (293.15 K) = 0.0 mL

The total volume of the gas collected, Vtotal = Vh2o + Vw + Vh2 = 0.0 mL + 32.0 mL + 0.0 mL = 32.0 mL

Now we can calculate Vw as follows: Vw = Vtotal - Vh2o = 32.0 mL - 0.0 mL = 32.0 mL

Finally, we can calculate the volume of the dry gas at STP: Vd = Vw - Vh2o

Vd = 32.0 mL - 0.9 mL ≈ 31.1 mL

Therefore, the volume of the dry gas at STP when a 32.0 mL sample of hydrogen is collected over water at 20.0 degrees Celsius and 750.0 torr is 31.1 mL.

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Ernest Rutherford is the physicist who carried out the gold foil experiment and found that the atom has a positively charged nucleus in the centre and that the majority of that atom is empty space.

The gold foil experiment was carried out in 1911 by Ernest Rutherford, who attacked a thin sheet of gold foil with alpha particles and tracked their scattering patterns.

Based on his discoveries, he put forth the nuclear model of the atom, which argues that the majority of the atom is made up of empty space and contains a positively charged nucleus at its core. The advancement of the contemporary atomic theory was greatly aided by this experiment.

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The correct answer is 3, 2. If Fe3+ is surrounded by weak-field ligands in an octahedral configuration, there will be 3 electrons in the lower three metal orbitals and 2 electrons in the upper two metal orbitals. So, the correct option is A.

An octahedral complex is a complex where the coordination sphere of a central metal ion is composed of six ligands that are located at the corners of an imaginary octahedron. The octahedral arrangement of six ligands is the most common coordination mode. The configuration of the eight corners of an octahedron is made up of six ligands, with the metal center located at the center.

The d5 electron configuration for Fe3+ is t2g3eg2, which is filled according to Hund’s rule with the lower-energy orbitals being filled first. According to the weak-field ligand hypothesis, the t2g orbitals will be relatively unaffected in energy, whereas the eg orbitals will be significantly raised in energy.

As a result, the three electrons in the t2g orbitals will occupy the lower-energy orbitals, while the two electrons in the eg orbitals will occupy the higher-energy orbitals. As a result, there will be 3 electrons in the lower three metal orbitals and 2 electrons in the upper two metal orbitals. The correct option is A. 3, 2.

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(a) The pH of pure water is 7, which is neutral. (b) The universal indicator would show a yellow color in an aqueous solution of sugar, because sugar is a neutral compound with a pH of 7.(c) The pH of the rain water is likely around 5 or 6, which indicates a weak acid.

pH is less than 7 since yellow color indicates acidic rainwater. Rainwater has an acidic pH because it dissolves atmospheric carbon dioxide (CO2), sulfur dioxide (SO2), and nitrogen oxides (NOx), forming weak carbonic, sulfuric, and nitric acids.

Rainwater that has a pH below 5.6 is considered to be acid rain. Therefore, the acid present in rainwater is a weak acid because the pH of the rainwater is above 1.

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The complete radioactive decay equation is as follows:

234/92 → 4/2He + 230/90 Th

Radioactive decay is a several processes by which unstable nuclei emit subatomic particles and/or ionizing radiation and disintegrate into one or more smaller nuclei.

According to this question, uranium with the mass number 234 and atomic number 92 undergoes a radioactive decay as follows:

234/92 U → 4/2 He + 230/90 Th

Uranium-234 nuclei decay by alpha emission to thorium-230, except for the tiny fraction (parts per billion) of nuclei that undergo spontaneous fission.

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A solution is prepared by dissolving 1.0 g of NaOH in a total of 250 mL of solution. Then 10.0 mL of this solution is withdrawn and added to 90.0 mL of water. The pH of the final solution is 11. Here option D is the correct answer.

To determine the pH of the final solution, we need to calculate the concentration of hydroxide ions (OH-) first.

1.0 g of NaOH is dissolved in a total volume of 250 mL of solution, which is equivalent to 0.004 moles of NaOH (since the molar mass of NaOH is 40.0 g/mol). Therefore, the concentration of NaOH in the original solution is:

c(NaOH) = 0.004 moles / 0.250 L

= 0.016 M

When 10.0 mL of this solution is added to 90.0 mL of water, the resulting concentration of NaOH is diluted by a factor of 10. Therefore, the concentration of NaOH in the final solution is:

c(NaOH) = 0.016 M / 10

= 0.0016 M

Since NaOH is a strong base, it completely dissociates in water to form one mole of hydroxide ions (OH-) for every mole of NaOH. Therefore, the concentration of hydroxide ions in the final solution is also 0.0016 M.

To calculate the pH of the solution, we use the following equation:

pH = 14 - pOH

Since the concentration of hydroxide ions is 0.0016 M, the pOH is:

pOH = -log[OH-]

= -log(0.0016)

= 2.80

Therefore, the pH of the solution is:

pH = 14 - pOH

= 14 - 2.80

= 11.20

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The rate constant k for the reaction is 3.84 x 10⁻³ s⁻¹.

The second-order rate law is expressed as:

rate = k [A]²

where;

The integrated rate law for a second-order reaction is:

1/[A]t - 1/[A]0 = kt

where;

Substituting the given values into the equation, we get:

1/1.38 - 1/2.91 = k(189)

0.7246 = k(189)

k = 0.7246/189

k = 3.84 x 10⁻³ s⁻¹ (to three significant figures in scientific notation)

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H₂S₂(g) is expected to have higher entropy than H₂S₂(l). CsBr(s) is expected to have higher entropy than Sro(s). H₂O(l) is expected to have higher entropy than H₂O₂(l). SO₃(g) is expected to have higher entropy than SO₃(s).

The entropy of the substance is determined by the amount of randomness and disorder it has. The higher the entropy, the greater the randomness of the substance. At the same temperature and pressure, a pure solid has a lower entropy than a pure liquid, which in turn has a lower entropy than a pure gas. The entropy of a substance is determined by its physical state, molecular structure, and the quantity of the substance.
H₂S₂ is a chemical compound with two sulfur atoms and two hydrogen atoms. The state of H₂S₂(g) is a gas, and H₂S₂(l) is a liquid. Since the gas state is more disordered than the liquid state, H₂S₂(g) is expected to have higher entropy than H₂S₂(l).
Both CsBr(s) and Sro(s) are in the solid-state. However, CsBr(s) has a higher entropy than Sro(s) because it has more molecules. This means that CsBr(s) has a greater degree of randomness and disorder than Sro(s).
H₂O(l) and H₂O₂(l) are both liquid states, but H₂O(l) has higher entropy because it has more degrees of freedom. H₂O(l) can rotate and translate freely, while H₂O₂(l) has a rigid structure that does not allow for the same degree of movement.
SO₃(g) is in the gaseous state, while SO₃(s) is in the solid-state. At the same temperature, the entropy of SO₃(g) is greater than that of SO₃(s) because the gas state is more disordered than the solid-state.

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There are 4 chirality centers in an aldohexose. The correct answer is option b.

Aldohexoses are six-carbon monosaccharides with a carbonyl functional group (aldehyde group) and five other carbon atoms, each of which is associated with an alcohol functional group in their straight-chain form. The carbonyl carbon, which is referred to as the anomeric carbon, determines the stereochemistry and the cyclic form of aldohexoses.

Chirality centers are carbon atoms that have four distinct substituents bonded to them, resulting in the ability to exist as stereoisomers. These stereoisomers are mirror images of each other and cannot be superimposed upon each other.Therefore, it is important to count the number of chirality centers present in the aldohexose structure.

There are four chirality centers in aldohexose, which are present at carbon atoms 2, 3, 4, and 5.

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We must apply Dalton's Law of Partial Pressures, which states that the total pressure of a gas mixture is equal to the sum of the partial pressures of each gas in the mixture, to determine the partial pressure of H2 gas in the eudiometer.

The atmospheric pressure of 0.993 atm must first be converted to mmHg using the formula: 0.993 atm x 760 mmHg/atm = 755.88 mmHg.

The total pressure of the gas inside the eudiometer may then be determined by:

Total pressure equals the sum of atmospheric pressure and water column pressure.

Total pressure = 16.5 cm x 1 mmHg/cm plus 755.88 mmHg

Pressure overall is 771.38 mmHg.

Eventually, we can determine the partial pressure of H2 gas using Dalton's Law and the supplied total pressure of 580 mmHg:

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For the weak acid, the expression for the acid ionization constant Ka is given by the equation O Ka = [H3O+](HSO3) /H2SO3.

How to find acid ionization constant Ka?

The acid ionization constant Ka of a weak acid HA is given by the equation shown below, where [H3O+] represents the hydrogen ion concentration of the solution, and [A-] represents the conjugate base of the acid. Ka = [H3O+][A-]/[HA]

It is possible to calculate the acid dissociation constant of a weak acid by measuring the degree of ionization of the acid. A higher degree of ionization indicates a stronger acid, while a lower degree of ionization indicates a weaker acid.

The acid ionization constant Ka is used to compare the strengths of various acids.

The correct option is O Ka = [H3O+](HSO3) /H2SO3). The acid ionization constant Ka for a weak acid is the equilibrium constant for the ionization reaction of the acid. The acid ionization constant for a weak acid, Ka, is expressed as:

Ka = [H3O+][A-]/[HA]

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Answer: d. possessing tiny protrusions known as microvilli. The proximal convoluted tubule's epithelial cells have microvilli on their surface, which increases their surface area and improves.

the efficiency of reabsorption of chemicals from the filtrate back into the circulation. The cells do not release enzymes to promote absorption, and the rugae folds and thin walls are not adaptations for reabsorption. The proximal convoluted tubule's epithelial cells are in charge of reabsorbing vital components from the glomerular filtrate, including glucose, amino acids, and electrolytes. Many microvilli, which are tiny finger-like projections on the surface of the cell that enhance the surface area accessible for reabsorption, are present in the cells, which enable them to perform this role. This modification makes it possible for chemicals to be reabsorbted more effectively as they move through the tubule. The rugae folds and thin walls, on the other hand, have little impact on reabsorption in the proximal convoluted tubule. In this region of the nephron, reabsorption likewise does not include enzyme secretion.

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The structure of the resulting compound from the reaction of NO and NO2 is the compound is known as dinitrogen pentoxide, N2O5.The bond energy in NO is about 631 kJ/mol.The bond energies in NO2 are both about 240 kJ/mol.

N2O5 is the chemical formula for dinitrogen pentoxide, often known as nitrogen pentoxide or nitric anhydride. It belongs to the family of chemicals known as binary nitrogen oxides, which simply consists of nitrogen and oxygen. It exists as colourless crystals that sublimate at a temperature just above ambient to produce a colourless gas. Dinitrogen pentoxide, an unstable and potentially harmful oxidant, was originally employed as a reagent for nitrations when dissolved in chloroform, but nitronium tetrafluoroborate has completely replaced it (NO2BF4).

N2O5 is a rare instance of a substance that can change its structure based on the environment. The solid is a salt, nitronium nitrate, consisting of distinct nitronium cations [NO2]+ and nitrate anions [NO3]−; although in the gas phase and under some other situations  it is a covalently-bound molecule.

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