' .
need asap hehheheh

Answer:

Ok this is my answer for you, I don't know if it will help but I hope it will

Explanation:

The balance chemical equation is

Fe2O3+3CO=2Fe+3CO2

Convert the 3.80g of Fe2CO3 to moles using the equation

Moles=mass/molar mass

Molar mass of Fe2O3=159.69g/mol

Moles of Fe2O3=3.80/159.69= 0.0238mol

The molar ratio of Fe2O3 to Fe is 1:2

The 1=0.0238mol

2 = x moles of Fe

Cross multiplying gives

x=0.0476mol of Fe

Convert moles to mass using the same equation solving for mass gives

Mass=moles*molar mass

Molar mass of Fe=55.845g/mol

Mass of Fe=0.047*55.845=2.66grams

The mole fractions of He and O₂ in the helium-oxygen mixture are 0.977 and 0.023, respectively.

To calculate the mole fraction of each component in the helium-oxygen mixture, we first need to find the total moles of gas in the tank. We can use the ideal gas law to do this:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.

Assuming atmospheric pressure, we have:

n = PV/RT = (1 atm)(15.0 L)/(0.0821 L atm/mol K)(298 K) = 0.687 mol

Now we can find the mole fraction of helium and oxygen:

x(He) = n(He)/n(total) = 23.0 g/(4.00 g/mol) / 0.687 mol = 0.977

x(O2) = n(O2)/n(total) = 4.27 g/(32.00 g/mol) / 0.687 mol = 0.0227

Therefore, the mole fraction of helium is 0.977, and the mole fraction of oxygen is 0.0227.

Learn more about helium here :brainly.com/question/18441533

#SPJ4

Complete question is in the image attached below

Answer:

According to the law of conservation of mass, the mass of the reactants must be equal to the mass of the products

Explanation:

law of conservation of mass

Answer:

displacement reaction

Answer:

"can be separated using physical means" is the answer

Answer:

the answer is C

Explanation:

6.7 to 13.2 then look at the numbers they go up but not a lot each time

Answer:

4 is answer. Explain how you know it is emit or absorb.

Explanation:

U-238 is a radioactive isotope of uranium, meaning it undergoes radioactive decay. Specifically, U-238 undergoes alpha decay, which involves the emission of an alpha particle. An alpha particle is composed of two protons and two neutrons, which is equivalent to a helium-4 nucleus.

The fact that U-238 is unstable and undergoes alpha decay can be determined based on its nuclear properties. U-238 has an atomic number of 92, indicating it has 92 protons in its nucleus. However, its atomic mass is 238, suggesting it has more than 92 nucleons (protons and neutrons) in its nucleus. This indicates the presence of additional neutrons in the U-238 nucleus.

The extra neutrons in the U-238 nucleus make it unstable and prone to decay. To achieve a more stable configuration, U-238 spontaneously emits an alpha particle from its nucleus. This emission reduces the number of protons and neutrons in the nucleus, resulting in the formation of a different nucleus.

Therefore, based on the radioactive properties of U-238, it is known to be unstable and spontaneously emit alpha particles during the process of radioactive decay.

Answer

C. -OH

Explanation

Alcohol molecules all contain the hydroxyl (-OH) functional group. They are a homologous series and have the general formula CnH 2n+ 1OH. Their names all end in -ol.

if 1500 tons of ammonia is needed to be produced daily to meet the needs of industry mass of nitrogen must be used from the atmosphere is  6.291 gram

Ammonia has alkaline properties and is corrosive and ammonia gas dissolves easily in water to form ammonium hydroxide a caustic solution and weak base

Here given data is 1500 tons of ammonia

1 tons = 1,000,000gram so

1500 tons = 1,500,000,000 gram

We have to calculate mass of nitrogen in 1500 tons ammonia =?

So, 1500 tons/17.031g/mol = 88.074g/mol

Then 88.074g/mol/14g/mol

= 6.291 gram

Therefore mass of nitrogen must be used from the atmosphere is  6.291 gram

Know more about nitrogen

https://brainly.com/question/14357532

#SPJ1

Answer:

barium Chloride (BaCl2)

Answer:

3, 2, 4, 1

Explanation:

That's the correct sequence

Answer:

Sn (Tin)

Explanation:

The entropy of saturated water is greater than that of subcooled water at 0°C. (True)

Yes, the statement is true. The entropy of saturated water is indeed greater than that of subcooled water at 0°C. Entropy is a measure of the degree of disorder or randomness in a system. In the case of water, as it undergoes phase transitions, its entropy changes.

When water is in a subcooled state at 0°C, it exists as a liquid with a relatively low level of thermal energy. The water molecules are arranged in a more ordered manner, with limited freedom of movement. This results in a lower entropy value compared to saturated water.

On the other hand, saturated water at 0°C is in equilibrium with its vapor phase. It contains both liquid and vapor phases in equilibrium, and the molecules have more freedom to move and occupy various positions. This increased molecular disorder leads to a higher entropy value compared to subcooled water.

In summary, saturated water at 0°C has a higher entropy because it represents a more disordered state with the coexistence of liquid and vapor phases, whereas subcooled water is in a more ordered state with limited molecular movement.

Learn more about Entropy

brainly.com/question/20166134

#SPJ11

The net ionic reaction for MnBr₂ +  Na₂SO₃ is  Mn²⁺(aq) + SO₃²⁻(aq) → MnSO₃(s).

The net ionic reactiion for MnBr₂ + Na₂SO₃ can be determined using the following steps:
1. Write the balanced molecular equation:
MnBr₂(aq) +  Na₂SO₃(aq) → MnSO₃(s) + 2NaBr(aq)
2. Write the total ionic equation by dissociating the strong electrolytes:
Mn²⁺(aq) + 2Br⁻(aq) + 2Na⁺(aq) + SO₃²⁻(aq) → MnSO₃(s) + 2Na⁺(aq) + 2Br⁻(aq)
3. Identify and remove the spectator ions (those that appear on both sides of the equation):
Mn²⁺(aq) + 2Br⁻(aq) + 2Na⁺(aq) + SO₃²⁻(aq) → MnSO₃(s) + 2Na⁺(aq) + 2Br⁻(aq)
Spectator ions: 2Na⁺(aq) and 2Br⁻(aq)
4. Write the net ionic equation by removing the spectator ions:
Mn²⁺(aq) + SO₃²⁻(aq) → MnSO₃(s)
So, the net ionic reaction for MnBr₂ + Na₂SO₃ is Mn²⁺(aq) + SO₃²⁻(aq) → MnSO₃(s).

To learn more about ionic equation https://brainly.com/question/19705645

#SPJ11

Boiling waterBoiling water is an example of a physical change and not a chemical change because the water vapor still has the same molecular structure as liquid water (H2O). If the bubbles were caused by the decomposition of a molecule into a gas (such as H2O →H2 and O2), then boiling would be a chemical change.

If temperature is increased, the rate of diffusion increases.

Diffusion is the process by which particles move from an area of higher concentration to an area of lower concentration. It occurs due to the random motion of particles. Temperature plays a significant role in the rate of diffusion.

When the temperature is increased, the kinetic energy of the particles also increases. This results in more frequent and energetic collisions between particles, causing them to move more rapidly. As a result, the rate of diffusion increases.

The increase in temperature leads to an increase in the average speed of particles, which in turn increases the likelihood of successful collisions and the overall rate of diffusion. The particles have higher energy to overcome the intermolecular forces and move through the medium.

Conversely, if the temperature is decreased, the particles have lower kinetic energy, which slows down their movement and reduces the rate of diffusion.

Therefore, when the temperature is increased, the rate of diffusion increases due to the increased kinetic energy and faster particle movement.

Learn more about diffusion

#SPJ11

brainly.com/question/14852229

Answer:

2.91 moles NH₃

Explanation:

To find the answer, you need to use Avogadro's number to convert between molecules and moles. It is important to arrange the ratio/conversion in a way that allows for the cancellation of units. The final answer should have 3 sig figs because the given value (1.75) also has 3 sig figs.

Avogadro's Number:

6.022 x 10²³ molecules = 1 mole

1.75 x 10²⁴ molecules NH₃                      1 mole
--------------------------------------  x  ------------------------------------  = 2.91 moles NH₃
                                                  6.022 x 10²³ molecules

answer✅☑️✔️️

1.0×10^-11

Answer:

A. 2 sig figs

Explanation:

In the number 0.0034, the zeros are called leading zeros. The only function of leading zeros is to fix the decimal point. Leading zeros are not counted as significant figures.

Answer:

its c ma man .

This is the other ray that will make up the angle ∠AYZ and will complete the constructioExplanation:

if your taking the quick check these were my awnsers

1.c

2.b

3.d

4.c

5 .A

for the copying an angle quick check only

The statement "molecules move in random directions when heated in a heat engine, and because of the lack of uniformity in the direction of molecular movement" is true.

When a heat engine is heated, molecules absorb heat energy and their kinetic energy increases. The kinetic energy of molecules causes them to move around. However, this movement is not uniform, and the molecules move in random directions.

A heat engine is a device that converts thermal energy into mechanical energy. Heat engines operate on the principle of thermodynamics.

They work by taking in thermal energy from a high-temperature reservoir, converting some of it into mechanical energy, and then releasing the remaining thermal energy to a low-temperature reservoir.The internal combustion engine in a car, the steam engine in an old locomotive, and the turbine in a power plant are all examples of heat engines. They all convert heat energy into mechanical energy to perform work.

To learn more about engine visit;

https://brainly.com/question/31140236

#SPJ11

Answer:

Periodic Table Project - SlideShare

this website should help you, if not then idrk.

Los elementos que forman aniones con carga -1 y una capa externa estable de ocho electrones pertenecen al grupo de los: halógenos.

Para alcanzar la estabilidad, los átomos siguen la regla del octeto: ganan, pierden o comparten electrones para tener 8 electrones en su capa externa (capa de valencia).

Los elementos del Grupo 17 de la Tabla Periódica, conocidos como halógenos, tienen 7 electrones en su capa de valencia. Así, tienden a ganar 1 electrón para completar su octeto. Como los electrones tienen carga negativa, al ganar 1 electrón los aniones quedan con una carga de -1.

Puedes aprender mas sobre la regla del octeto aquí: https://brainly.com/question/18892451

To find the values of the rate constant k for temperatures from 300 K to 1950 K with an increment of 75 °C, we can use the Arrhenius equation:

k = k0 * exp(-Q/RT)

Where:

k is the rate constant

k0 is the pre-exponential factor or frequency factor

Q is the activation energy

R is the ideal gas constant (1.987 cal/molK)

T is the temperature in Kelvin

Given:

Q = 7500 cal/mol

R = 1.987 cal/molK

k0 = 1250 min^(-1)

We need to convert the units to match the values given in the question. 1 min^(-1) is equivalent to 1/60 s^(-1), and 1 cal is equivalent to 4.184 J.

Temperature (K) | Temperature (°C) | k (s^(-1))

300 | 27 | 6.8368e-09

375 | 102 | 4.6899e-06

450 | 177 | 3.2105e-03

525 | 252 | 2.1952e+00

600 | 327 | 1.5014e+03

675 | 402 | 1.0277e+06

750 | 477 | 7.0394e+08

825 | 552 | 4.8251e+11

900 | 627 | 3.3071e+14

975 | 702 | 2.2670e+17

1050 | 777 | 1.5535e+20

1125 | 852 | 1.0642e+23

1200 | 927 | 7.2997e+25

1275 | 1002 | 5.0045e+28

1350 | 1077 | 3.4289e+31

1425 | 1152 | 2.3506e+34

1500 | 1227 | 1.6104e+37

1575 | 1302 | 1.1035e+40

1650 | 1377 | 7.5637e+42

1725 | 1452 | 5.1866e+45

1800 | 1527 | 3.5549e+48

1875 | 1602 | 2.4343e+51

1950 | 1677 | 1.6694e+54

To learn more about  Arrhenius

https://brainly.com/question/28038520

#SPJ11

Answer: Tetracycline is an antibiotic containing multiple functional groups, including an amine group, an alcohol group, a carboxylic acid group, and a ketone group.

Tetracycline is an antibiotic containing multiple functional groups. The functional groups present in this molecule are an amine group, an alcohol group, a carboxylic acid group, and a ketone group.

The amine group is composed of nitrogen and hydrogen atoms, and is often found in organic compounds. It is also known as an amino group.

The alcohol group is composed of an oxygen and hydrogen atom bonded to a hydrocarbon group, usually a single bond. It is also known as a hydroxyl group.

The carboxylic acid group is composed of a carbonyl and hydroxyl groups, and is often found in organic compounds. It is also known as an carboxyl group.

The ketone group is composed of two oxygen atoms and two carbon atoms, and is often found in organic compounds. It is also known as a keto group.

In conclusion, tetracycline is an antibiotic containing multiple functional groups, including an amine group, an alcohol group, a carboxylic acid group, and a ketone group.

Learn more about antibiotic here:

https://brainly.com/question/30012458#



#SPJ11

Answer:

Magnetic Quantum Number (ml): ml = -l, ..., 0, ..., +l. Specifies the orientation in space of an orbital of a given energy (n) and shape (l). This number divides the subshell into individual orbitals which hold the electrons; there are 2l+1 orbitals in each subshell.

Answer:  Chemistry, like physics and biology, is a natural science. In fact, there is considerable overlap between chemistry and these other disciplines. Chemistry is a science that studies matter. This includes atoms, compounds, chemical reactions, and chemical bonds.

Explanation:  Chemistry is the scientific study of the properties and behavior of matter. It is a natural science that covers the elements that make up matter to the compounds made of atoms, molecules, and ions: their composition, structure, properties, behavior, and the changes they undergo during a reaction with other substances.

The best combination for preparing a pH 7 buffer is option C, H3AsO4 and Na3AsO4.The option C is correct.

Arsenic acid, H3AsO4, is a triprotic acid with the following acid dissociation constants:Ka1 = 5.5 × 10-3 ? Ka2 = 1.7 × 10-7 ? Ka3 = 5.1 × 10-12. The best combination for preparing a pH 7 buffer is Na2HAsO4 and Na3AsO4.

What is a buffer?

A buffer is a substance that can neutralize an acid or a base to preserve a stable pH range.

A buffer is a mixture of a weak acid and its conjugate base or a weak base and its conjugate acid. A buffer is formed when an acid and its corresponding base or a weak acid and its conjugate base are combined in equal amounts. A buffer solution maintains its pH because the conjugate base of the weak acid neutralizes any added H+ ions

Whereas the weak acid neutralizes any added OH– ions. Thus, if the mixture contains both the weak acid and its conjugate base, the pH remains stable. Therefore, the best combination for preparing a pH 7 buffer is Na2HAsO4 and Na3AsO4.

To learn more about triprotic acid here:

https://brainly.com/question/29068526

#SPJ11