what is the enthalpy change (in kj) of a chemical reaction that raises the temperature of 250.0 ml of solution having a density of 1.25 g/ml by 7.80 c

The number of mole of O₂ required for the reaction if 15.0 grams of N₂O4 is produced, is 0.326 mole

We'll begin by obtaining the number of mole in 15.0 g of N₂O₄. Details below:

Mole = mass / molar mass

Mole of N₂O₄ = 15 / 92

Mole of N₂O₄ = 0.163 mole

Next, we shall write the balanced equation for the reaction. This is givrn below:

N₂ + 2O₂ -> N₂O₄

From the balanced equation above,

1 mole of N₂O₄ was produced from 2 moles of O₂

Finally, we shall determine the number of mole O₂ required for the reaction. Details below:

From the balanced equation above,

1 mole of N₂O₄ was produced from 2 moles of O₂

Therefore,

0.163 moles of N₂O₄ will be produced from = 0.163 × 2 = 0.326 mole of O₂

Thus, number of mole of O₂ required is 0.326 mole

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Answer:

it is D

Explanation:

Answer: 1s²2s²2p³ or it can also be 3s²2p³

Answer: 4848.22 mL

Explanation:

V2= P1V1T2/(T1 P2)  = (400.00 X 12.0 X 300.15)/(270.15 x 1.10)

Answer:

Sex cells are different in body cells because the sex cells are eggs while body cells are formed.

Answer:

O Trilobites

Explanation:

The first mass extinction that occurred between the Paleozoic and the Mesozoic era caused the extinction of the trilobites.

Extinction are catastrophic events that causes the loss of organisms on the earth surface. Several factors can lead to extinction.

c) only from warm object to colder ones

Answer:

c. only from warm objects to colder ones

Answer:

Hạt nhân của nguyên tử X có điện tích là 30,4.10-19 culông. Tìm số p,e của nguyên tử X

The composition of the equilibrium mixture cannot be determined without the knowledge of the equilibrium constant (Kp) for the methanol synthesis reaction at 550 K and 100 bar.

Aromatic compounds possess a cyclic structure with a conjugated system of π electrons, allowing for resonance and charge delocalization, which leads to increased stability

Certainly! Here are some examples of aromatic compounds and non-aromatic compounds. Please drag each item to the appropriate bin:

Aromatic Compounds:

Benzene (C₆H₆)

Toluene (C₇H₈)

Naphthalene (C₁₀H₈)

Pyridine (C₅H₅N)

Non-Aromatic Compounds:

Ethane (C₂H₆)

Cyclohexane (C₆H₁₂)

Propanal (C₃H₆O)

Acetylene (C₂H₂)

Aromatic compounds possess a cyclic structure with a conjugated system of π electrons, allowing for resonance and charge delocalization, which leads to increased stability. On the other hand, non-aromatic compounds lack these specific features and do not exhibit the same level of stability as aromatic compounds.

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Definition: Fluid that can act as a liquid or as a solid depending on the pressure applied on it.

Explanation:

A fluid that incorporates time in a solid and liquid model is a non-Newtonian fluid. This type of fluid can behave as a solid or as a liquid depending on the pressure that is applied on it. This is different from normal fluids that remain the same regardless of the pressure they are subjected to. In the case of non-Newtonian fluids, when submitted to pressure, they are presented as solids, but without pressure, they are presented as liquids. This feature can be seen even within the same system.

Answer:

For example, the compound FeSO4 is called iron(II) sulfate, because it contains Fe2+.

Explanation:

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Answer: 2400 km

Explanation: 1200 km/hr • 2 hr = 2400 km

The half life is the time taken for only one of the half  of the radioactive substance to remain.

The half life is the time taken for only one of the half  of the radioactive substance to remain. We can see the half life by looking at the graph and observing the point at which the sample decreases to half its original number.

Since the half life of carbon-14 is 5700 years, after ten half lives, almost 60000 years has elapsed thus there is little or no carbon-14 left. As a result of this carbon-14 can not be used if the sample is over 60000 years old.

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A 30% (w/v) solution of vitamin C was diluted to 200 ml. The weight/volume percent concentration of the resulting solution is 15%.

To find the weight/volume percent concentration after diluting, we need to use the formula:

C1V1 = C2V2

Where C1 is the initial concentration, V1 is the initial volume, C2 is the final concentration, and V2 is the final volume.

Given:

C1 = 30% (w/v)

V1 = 100 mL

V2 = 200 mL

Using the formula, we can solve for C2:

C1V1 = C2V2

(30%)(100 mL) = C2(200 mL)

C2 = (30%)(100 mL) / (200 mL)

C2 = 15%

Therefore, the weight/volume percent concentration of the 100 mL of 30.0% (w/v) solution of vitamin C after diluting to 200 mL is 15%.

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If a naturally occurring sample of an unidentified element is found to contain three isotopes (A, B, and C) and consists of 90.5% isotope A (mass number 20), 0.3% isotope B (mass number 21), and 9.3% isotope C (mass number 22), the atomic weight of the element measured from the sample will be greater than 21 amu.

To calculate the average atomic mass, multiply the fraction through the mass number for every isotope, then add them together. Whenever we do mass calculations concerning elements or compounds (combos of elements), we usually use average atomic loads.

For instance, carbon-14 is a radioactive isotope of carbon that has six protons and 8 neutrons in its nucleus. We name it carbon-14 because the overall range of protons and neutrons within the nucleus also called the mass number, provides up to fourteen (6+8=14).

Together, the quantity of protons and the range of neutrons determine an detail's mass variety. Due to the fact, that an element's isotopes have barely unique mass numbers, the atomic mass is calculated by obtaining the suggested mass numbers for its isotopes.

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Answer:

By watching the movement of cirrus clouds you can tell from which direction weather is approaching. When you see cirrus clouds, it usually indicates that a change in the weather will occur within 24 hours. Cirrostratus clouds are thin, sheetlike high clouds that often cover the entire sky.

Explanation:

im smart;)

Answer:

in the troposphere

Explanation:

First we need to find the wavelength from the frequency using \(C = \lambda V\)

so \(3.0e8 = \lambda * 2.2e16 Hz\) which equals 1.36e-8 m then we use the formula \(E =h \frac{C}{\lambda}\) we plug in \(E = 6.63e-34 * (3.0e8/1.36e-8)\) and we get \(E = 1.46e-17\)

so the energy is 1.46 x 10^-17 J.

Answer:

A, 1.5 × 10 ^–17 J

Explanation:

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If a fatty acid has 20 carbons, ATP will it produce after it completely breaks down into co2 and water would be approximately 129 ATP

During beta-oxidation in the mitochondria, the fatty acid is broken down into two-carbon units called acetyl-CoA, which enters the citric acid cycle to produce ATP. Each round of the citric acid cycle produces 1 ATP, 3 NADH, and 1 FADH2, which enter the electron transport chain to produce more ATP.

Since one fatty acid with 20 carbons produces 10 acetyl-CoA units, it goes through the citric acid cycle 10 times, therefore, it produces 10 ATP, 30 NADH, and 10 FADH2. The NADH and FADH2 produced from beta-oxidation produce more ATP through oxidative phosphorylation in the electron transport chain, producing approximately 2.5 ATP per NADH and 1.5 ATP per FADH2. So, the total ATP produced from the complete breakdown of a fatty acid with 20 carbons would be approximately 129 ATP (10 from the citric acid cycle and 119 from the electron transport chain).

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Answer : The molecular formula for this compound is C7H14

To determine the molecular formula of the compound, we need to first calculate its empirical formula using the given mass percentages of carbon and hydrogen. The mass percent of carbon in the compound is: (3.140 g / 3.742 g) x 100% = 83.9%

The mass percent of hydrogen in the compound is: (0.602 g / 3.742 g) x 100% = 16.1%. Assuming a 100 g sample of the compound, we can calculate the masses of carbon and hydrogen in the sample: Mass of carbon = 83.9 g and Mass of hydrogen = 16.1 g

Next, we need to convert these masses to moles, using the atomic masses of carbon and hydrogen:1 mol C = 12.01 g, 1 mol H = 1.008 g. Moles of carbon = 83.9 g / 12.01 g/mol = 6.983 mol, Moles of hydrogen = 16.1 g / 1.008 g/mol = 15.95 mol. Dividing each mole value by the smallest mole value, we get the following mole ratio: C:H = 6.983 / 6.983 = 1.000 : 2.285

The empirical formula for the compound is therefore CH2. To determine the molecular formula, we need to find the molecular weight of the empirical formula, and then divide the given molar mass by this value to get the molecular formula multiplier. Molecular weight of CH2 = 12.01 + 2(1.008) = 14.026 g/mol, Molecular formula multiplier = 100.2 g/mol / 14.026 g/mol = 7.146. Multiplying the empirical formula by this multiplier, we get the molecular formula: C7H14

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Explanation:

Particles is a gas are well separated with no regular arrangement. liquid are close together with no regular arrangement. solid are tightly packed, usually in a regular pattern....

I hope you got it

Approximately 16,946 grams of H₂ needs to be collected each month to produce 909 kg of water per year in the Sabatier Reactor.

The balanced chemical equation for the electrolysis of water is:

2H₂O(l) → 2H₂(g) + O₂(g)

From the equation, we can see that 2 moles of water produce 2 moles of H₂ gas. The molar mass of water is 18.015 g/mol, and the molar mass of H₂ is 2.016 g/mol.

To calculate the number of grams of H₂ that needs to be collected each month to produce 909 kg of water per year, we can use the following steps:

Calculate the number of moles of water produced per year:

909 kg/year x (1000 g/kg) / 18.015 g/mol = 50,471.5 mol/year

Calculate the number of moles of H₂ produced per year:

50,471.5 mol/year x 2 mol H₂/mol H₂O = 100,943 mol/year

Calculate the number of moles of H₂ produced per month:

100,943 mol/year / 12 months = 8,412 mol/month

Convert the number of moles of H₂ to grams:

8,412 mol/month x 2.016 g/mol = 16,945.9 g/month

Therefore, approximately 16,946 grams of H₂ needs to be collected each month to produce 909 kg of water per year in the Sabatier Reactor.

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Answer: 3:2

Explanation:

The balanced equation for the reaction of iron with water that results in the production of iron oxide and hydrogen gas is

3 Fe (s) + 4H₂O (g) → Fe₃O₄ (s) + 4H₂ (g)

Iron does not react directly with liquid water but react with water vapour. When the reaction happens, it results in the formation of a solid and a gas. The products of the reaction are Iron oxide and hydrogen. The equation of the reaction would be

Fe (s) + H₂O (g) → Fe₃O₄ (s) + H₂ (g)

Now, we need to balance the equation. On the right-hand side, we have 3 Fe, 4 O and 2 H. Similarly on the left-hand side there are 1 Fe, 1 O and 2 H.

To balance the equation, we add 3 to Fe, 4 to H₂0 and 4 to H₂.

As a result, the balanced chemical equation for the reaction would be

3 Fe (s) + 4H₂O (g) → Fe₃O₄ (s) + 4H₂ (g)

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Answer:

\({ \rm{2H {}^{ + } _{(aq)} + CO {}^{2 - } _{3(aq)} \: \: \: {}^{ { \huge{\dashrightarrow} }} _{ \huge{ \dashleftarrow}} }} \: \: { \rm{H _{2} CO _{3(aq)} }}\)