under what conditions is the internal energy change close in value to the enthalpy change for a reaction

The number of mole of HNO₃ that will be produced from the reaction of 57.0 g of NO₂ with excess water is 0.826 mole

First, we shall obtain the number of mole in 57.0 g of NO₂. This shown below:

Mole = mass / molar mass

Mole of NO₂ = 57 / 46

Mole of NO₂ = 1.239 mole

Finally, we shall determine the number of mole of HNO₃ produced. Details below:

3NO₂(g) + H₂O(l) → 2HNO₃(g) + NO(g)

From the balanced equation above,

3 moles of NO₂ reacted to produce 2 moles of HNO₃

Therefore,

1.239 mole of NO₂ will react to produce = (1.239 × 2) / 3 = 0.826 mole of HNO₃

Thus, we can conclude that the number of mole of HNO₃ produced is 0.826 mole

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the density of the proton is 3.2×10−11g/cm3 3.2 × 10 − 11 g / c m 3 . if Calculate the density of a proton, given that the mass of a proton is 1.0073 amu.

Density is the measure of how much “stuff” is in a given amount of space. For example, a block of the heavier element lead (Pb) will be denser than the softer, lighter element gold (Au). A block of Styrofoam is less dense than a brick.

Density is a word we use to describe how much space an object or substance takes up (its volume) in relation to the amount of matter in that object or substance (its mass).

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The average atomic mass of the element is 12.0107 amu.

To calculate the average atomic mass of the element in question, we can use the following formula:

average atomic mass = (mass of isotope 1 x abundance of isotope 1) + (mass of isotope 2 x abundance of isotope 2)

where "mass of isotope 1" is the mass of the first stable isotope (13 amu in this case), "abundance of isotope 1" is the percentage of that isotope in the element (1.07% in this case), "mass of isotope 2" is the mass of the second stable isotope (12 amu in this case), and "abundance of isotope 2" is the percentage of that isotope in the element (98.93% in this case).

Substituting the given values in the formula, we get:

average atomic mass = (13 amu x 1.07%) + (12 amu x 98.93%)

average atomic mass = (0.1391 amu) + (11.8716 amu)

average atomic mass = 12.0107 amu

Therefore, the average atomic mass of the element is 12.0107 amu.

This means that on average, one atom of this element weighs 12.0107 atomic mass units (amu), which is slightly heavier than the most abundant isotope (12 amu) due to the presence of the less abundant isotope (13 amu). This concept is important in chemistry because the mass of atoms plays a crucial role in determining their chemical and physical properties. The knowledge of the average atomic mass of an element is important in a wide range of applications, including analytical chemistry, geochemistry, and nuclear physics.

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Answer:

Example 1

palladium(II) nitrate,

Example 2

Metal catalysts such as Fe, Ni, Mo, and Co are routinely used in the manufacture of CNMs.

Explanation

The three metals used in catalytic converters — rhodium, platinum and palladium — are part of a category known as platinum group metals, or PGMs, which are known for their catalytic properties.

The mass of the asteroid is C. 1.2 x \(10^{12}\) Kg

To find the mass of the other asteroid, we can rearrange the equation for the gravitational force between two objects:

F = (G * m1 * m2) / \(r^{2}\)

where F is the force of gravity, G is the gravitational constant, m1 and m2 are the masses of the two asteroids, and r is the distance between them.

Given that the distance between the asteroids is 75000 m, the force of gravity between them is 1.14 N, and one asteroid has a mass of 8 x \(10^{7}\) kg, we can substitute these values into the equation and solve for the mass of the other asteroid (m2):

1.14 N = (6.67430 × \(10^{-11}\) N \(m^{2}\)/\(Kg^{2}\) * 8 x \(10^{7}\) kg * \(m2\)) / \((75000 m)^{2}\)

Simplifying and solving the equation, we find that the mass of the other asteroid (m2) is approximately 1.2 x \(10^{12}\) kg. Therefore, Option C is correct.

The question was incomplete. find the full content below:

Two asteroids are 75000 m apart one has a mass of 8 x \(10^{7}\) kg if the force of gravity between them is 1.14 what is the mass of the asteroid

A. 3.4 x \(10^{11}\) kg

B. 8.3 x \(10^{12}\) kg

C. 1.2 x \(10^{12}\) kg

D. 1.2 x \(10^{10}\) kg

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Answer:

Steam distillation is a separation process which purifies isolate temperature-sensitive materials, such as natural aromatic compounds. In steam distillation, dry steam is passed through the plant material. These vapours undergo condensation and collection in receivers.

distillation under pressure is used for the purification of those substance which get decompose on their boiling point. so , a suction pump (vaccum) is fitted with a beaker in order to lower it's pressure, due to which boiling pressure decreases. so that it can be distilled of before reaching to its boiling point.

Fractional distillation is a type of distillation which involves the separation of miscible liquids. The process involves repeated distillations and condensations and the mixture is usually separated into component parts. The separation happens when the mixture is heated at a certain temperature where fractions of the mixture start to vaporize.

Explanation:

HOPE IT HELPS YOU

Answer:

The kinetic molecular theory explains the movement of molecules within gases.

Explanation:

Answer:

true

Explanation:

because an organism have many roles in food web

Answer:

A. hamper

Explanation:

i did this question before.

Answer:

Improve

Explanation:

They improved Washington's rank so that he could rise to the top.

Answer:

LiCl.

Explanation:

Hello there!

In this case, since it is known that the ionic compounds are specially formed between metals and nonmetals, it is possible for us to discard CO and PCl5 as they have both nonmetals.

On the other hand, since the bonds between nonmetals and transition metals like iron and copper may not be completely ionic due to the electronegativity trend, we infer that the most likely ionic compound is LiCl because of the large electronegativity difference.

Regards!

Answer:  Protons

Explanation:

Answer:

19.5 mL

Explanation:

A quasar is a star that emits intense radio and light energy.

A quasar is an extremely bright radio source. It is called a quasi-stellar radio source. It appears to be like a star but is not a star. These quasars are young galaxies that are located far away from us and are highly luminous. The luminosity of a quasar is 1000 times greater than the luminosity of a milky way galaxy.

A quasar is powered by a supermassive black hole with its mass ranging from millions to tens of billions of solar masses, surrounded by a gaseous accretion disc.

The quasars were first discovered in the 1950s using the Hubble space telescope and were found to be a massive bright source emitting radio waves of unknown origin. But now, millions of quasars were discovered.

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Reactions are balanced by equating the right and the left side by stoichiometry coefficients. The redox reactions are balanced and corrected by simplifying the numbers.

A redox reaction is a depiction of the oxidation and the reduction of the reaction that shows the loss and the gain of the electrons by the chemical species.

The oxidation half-reaction:

Mg  →  Mg²⁺ + 2e⁻

The reduction half-reaction:

2Au + 2 e⁻ → 2 Au

The overall balanced reaction is:

Mg(s) + 2Au⁺ (aq)  → Mg²⁺ (aq) + 2Au(s)

Therefore, the reaction is balanced by the oxidation and the reduction halves.

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Answer:

77.53 g of Na₂O is the answer to your question

The answer is: The electronic configuration of Nitrogen is \(1s^22s^22p^3\).

Electronic configuration: The electronic configuration is defined as the distribution of electrons of an atom in the atomic or molecular orbitals and is written using the labels for the subshell.

How to decide which orbital is filled first?

(Shown in image)

         \(1s^22s^22p^3\)

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Nitrogen's complete electron configuration is 12s2s22p3.

The shorthand electron configuration for noble gases is [He] 2s22p3. Nitrogen has an atomic number of 7. The nitrogen atoms' nucleus contain this many protons. An atom that is neutral has an equal number of protons and electrons. Thus, the ground state electron configuration will consist of 7 electrons in the suitable s and p orbitals (state of lowest energy). For nitrogen, the entire electron configuration is 1s22s22p. Scientists may easily express and explain how the electrons are organized around the nitrogen atom's nucleus by using the configuration notation for nitrogen (N). As a result, it is simpler to comprehend and forecast how atoms will cooperate to form chemical bonds.

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Answer:

CaS + 2H2O is the balanced equation

Answer:

i think its D

Explanation:

In order to get maximum accuracy, student should take average of results from all four trials.

Accuracy  in terms of chemistry can be defined as to how close a measurement is to the true value.There are three types of accuracy:

1) Point accuracy-It means accuracy is present at that point of scale only.It does not give any information about the accuracy of the instrument.

2)Percentage of true value--It is the accuracy  which is determined by identifying accuracy of the instrument  and comparing it with the measured true value.

3)Percentage of scale range- It is the accuracy  which determines accuracy of the measurement.

Accuracy in case of instruments  is neglected up  to ±0.5 percent.Accuracy of measurements can be increased by taking multiple measurements and taking into account human errors.

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Answer:

20g

Explanation:

14g+6g=20g

Answer:

C

Explanation:

edge2021!!

Answer:  The correct answer is c. change attitudes, beliefs or values.

Explanation:

Of these goals, the hardest to achieve is changing attitudes, beliefs, and values. It is difficult to convince an audience to truly change their attitudes, beliefs, or values based on your presentation since it typically requires establishing trust and respect on a personal level.

The strand 1 of hydrocarbons is used to produce plastic, hence option D is correct.

Raw resources like natural gas, oil, or plants that have been processed into ethane and propane are used to make plastics. The subsequent "cracking" procedure uses heat to transform ethane and propane into ethylene and propylene. To produce various polymers, these components are mixed.

Propylene is a substance found in large quantities in petroleum. In order to speed up chemical processes, refiners combine heated propylene with a catalyst to create plastic. Propylene molecules start to cluster together like beads on a thread as a result.

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Explanation:

Enzymes are proteins functioning as catalysts that speed up reactions by lowering the activation energy. A simple and succinct definition of an enzyme is that it is a biological catalyst that accelerates a chemical reaction without altering its equilibrium.

The equation C2H4(g) + H2(g) + C2H6(g) → Caco3(s) + Cao(s) + CO2(g) shows an increase in entropy due to the formation of a gas as a product. Option A

In this equation, the reactants on the left-hand side consist of gases (C2H4 and H2), while the products on the right-hand side include a solid (Caco3) and a gas (CO2).

When a reaction involves a change from gaseous to solid or liquid states, there is typically a decrease in entropy because the particles become more ordered and constrained in the solid or liquid phase.

Conversely, when a reaction involves the formation of gases, there is generally an increase in entropy because gases have higher degrees of molecular motion and greater freedom of movement compared to solids or liquids.

In the given equation, the reactants include three gaseous compounds (C2H4, H2, and C2H6), and one of the products is a gas (CO2). Therefore, the overall entropy of the system increases during this reaction.

The equation Fe(s) + S(s) → FeS(s) does not show an increase in entropy. Both the reactants (Fe and S) and the product (FeS) are solids. Since solids have lower entropy compared to gases or liquids, the entropy of the system does not increase in this reaction. Option A

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Answer: iodine is oxidised and Chlorine is reduced

Explanation: iodine is oxidised, in I2 oxidation number sim 0,

in HIO oxidation number is +I.

Chlorine is reduced, oxidation number changes from 0 to -I

Answer:

  2C₄H₁₀ + 13O₂ ⟶ 10H₂O + 8CO₂

Explanation:

  2C₄H₁₀ + 13O₂ ⟶ 10H₂O + 8CO₂  . . . . .  balanced combustion reaction

  C₄H₁₀ + 5O₂ ⟶ 5H₂O + 4CO₂  . . . . not balanced

The two reactions involving Ca are not combustion reactions.

The equation that shows a balanced nuclear equation is as follows: 14/6 C → 0/-1 e + 14/7 N (option D)

A nuclear reaction is a process such as the fission of an atomic nucleus, or the fusion of one or more atomic nuclei and/or subatomic particles in which the number of protons and/or neutrons in a nucleus changes.

Nuclear equations represent the reactants and products in radioactive decay, nuclear fission, or nuclear fusion.

According to this question, certain nuclear equations are given. The balanced equation will have atoms of elements that are of the same number on both sides.

The fourth option is balanced because the number of atoms add up to ensure the conservation of mass.

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The given temperature of water is 50 degrees Celsius, hence, we can conclude that the phase of the given water is liquid phase.

Water can exist in three different phases, namely;

Therefore, if the given temperature of water is 50 degrees Celsius, hence, we can conclude that the phase of the given water is liquid phase.

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The elements  are in the unknown sample of emission spectrums is lithium and potassium.

When light is emitted through a chemical material, it is known as an emission spectrum. An emission spectrum is a development of many types of lines in a variety of colors and wavelengths.

The red line emits light with the longest wavelength, which may be easily measured using a spectrophotometer when light passes through it.

Lithium and potassium are hence elements in the unidentified emission spectrum sample. B and E are the proper answers.

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Missing parts:

The emission spectrums are known for the elements below. Line spectra for boron, lithium, hydrogen, helium, potassium and unknown sample. Boron has 3 purple lines, 1 blue line, 2 blue-green lines and 2 orange lines. Lithium has 2 purple lines, 2 blue lines, 2 blue-green lines, 1 orange line and 1 red line. hydrogen has one line of each purple, blue, blue-green and red. helium has 3 purple lines, 3 blue lines, 3 blue-green lines 1 yellow line and 2 red lines. Potassium has 8 purple lines, 6 blue-green lines, 10 green lines, 3 yellow lines, 2 orange lines and 6 red lines. The unknown sample has Potassium has 8 purple lines, 6 blue-green lines, 10 green lines, 3 yellow lines, 2 orange lines and 6 red lines. What elements are in the unknown sample? Check all that apply. boron lithium hydrogen helium potassium