What other information do you need in order to determine the molecular formula from the empirical formula of a compound?

When 35.0 g of iron(I) chloride is reacted, approximately 558 kJ of heat is released.

To calculate the amount of heat released in the reaction, we need to determine the number of moles of iron(I) chloride (FeCl) and then use the given enthalpy change (AH°) value.

Calculate the moles of FeCl (iron(I) chloride):

Given mass of FeCl: 35.0 g

Molar mass of FeCl: 55.85 g/mol (iron) + 35.45 g/mol (chlorine)

Molar mass of FeCl = 91.30 g/mol

Moles of FeCl = mass / molar mass

Moles of FeCl = 35.0 g / 91.30 g/mol

Moles of FeCl ≈ 0.383 mol

Using the stoichiometric coefficients in the balanced equation, we can relate the moles of FeCl to the heat released:

From the balanced equation: 6 mol FeCl

= 349 kJ

So, 0.383 mol FeCl = (349 kJ / 6 mol) × 0.383 mol

0.383 mol FeCl ≈ 22.48 kJ

Therefore, when 35.0 g of iron(I) chloride is reacted, approximately 22.48 kJ of heat is released.

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Answer:

igneous, sedimentary, and metamorphic

Explanation:

Answer:

IGNEOUS ROCKS form when molten rock (magma or lava) cools and solidifies. SEDIMENTARY ROCKS originate when particles settle out of water or air, or by precipitation of minerals from water.

And METAMORPHIC (I dont have nothing for this won)

Explanation:

Answer:

D) Matter

Explanation:

Answer:  Time = Distance ÷ Speed

Answer:

Explanation:

Astronomers define star brightness in terms of apparent magnitude. How bright the star appears from Earth and absolute magnitude is how bright the star appears at a standard distance of 32.6 light-years, or 10 parsecs. (A light-year is the distance light travels in one year is about 6 trillion miles, or 10 trillion kilo meters.) Astronomers also measure luminosity, the amount of energy (light) that a star emits from its surface.

Distance of a light year = 3600 x 24 x 365.25 x 3 x \(10^{5}\) ≅ 10 trillion kilo meters

Answer:

apparent

Explanation:

The brightness of a star as seen from Earth is referred to as

apparent brightness.

Answer:

3rd principal energy level

Explanation:

Principle energy that explains the energy of the electrons and positions of electrons of a particular atom. There are four energy levels fist to fourth that are made of sublevels and that is made up of s, p, d and f orbitals.

First principal energy level -  2

Second principal energy level - 8

Third principal energy level - 18

Fourth principal energy level -  32

3rd energy level has 9 orbitals, which has 18 electrons

2 in the s orbital,

6 in the three p orbitals, and

10 in the five d orbitals.

So, here there are only 8 electrons in the third principal energy level.

The volume of the methanol in the sample is 252.58 mL

The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as

Density = mass / volume

With the above formula, we can obtain the volume of the methanol. Details below

The following data were obtained from the question;

Density = mass / volume

Thus,

Volume = mass / density

Volume of methaonl = 200 / 0.7918

Volume of methaonl = 252.58 mL

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As various energy atoms collide with each other, the nuclei fuse to become helium atoms and then they collide and evolve into bigger atoms. This all occurs in the core of the sun.

The energy from the Sun - both heat and light energy - originates from a nuclear fusion process that is happening inside the core of the Sun. The specific sort of fusion that happens inside the Sun is known as proton-proton fusion. Inside the Sun, this cycle commences with protons (which are simply a lone hydrogen nucleus), and through a sequence of steps, these protons fuse together and are contorted into helium. This fusion process occurs inside the core of the Sun and the conversion results in a discharge of energy that upholds the sun hot.

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The thing that will happen if the mechanisms for communication of ideas and discussion of science production did not exist is that researches will be harder to make.

The transmission of information is commonly defined as communication. The term can also refer to the message itself or to the field of study that investigates such transmissions.

Because the active role of all participants in this process is recognized, the term "science communication" is now more commonly used than "popularization." Making science more accessible to the general public can help to alleviate society's current confusion and instill hope for the future.

Effective communication is critical to addressing the diversity and inclusion issues that plague science. Without effective communication, gatekeeping will persist, and barriers to understanding science will remain.

Aside from benefiting society as a whole, communicating outside the scientific community can help a researcher's career by increasing the impact of their latest findings, fostering new collaborations across sectors, raising their public profile, and opening doors to unexpected opportunities

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Answer:

2,8,1

Explanation: This is the number of electrons sodium has on each electron shell

Answer: the longest a virus that can be kept on a plastic bag is a few hours to a couple of days.

Explanation: hope that helped!(:

The 1H NMR spectrum contains a total of four signals.

NMR Spectroscopy integration. In NMR, the integration reveals how many protons a particular signal is made up of. Let's say that it is the ratio of the protons behind each signal to be more precise.

Thus, the 1H NMR spectrum of the molecule methyl acetate exhibits two signals. Why only two signals for a molecule having total six hydrogens? The reason for this is chemical equivalency. The three Ha protons in the methyl group, which is bound to C=O, can be used to separate the six hydrogens in total into two groups.

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Cells are related to onion due to the presence of round shape and outer covering.

Cells are related to onion because onion is round in shape just like cell. It has outer covering that protects the inner side of the onion and we know that cell has also cell wall that protects the inner organelles.

In the onion cell, the nucleus is present at the periphery of the cytoplasm. The vacuole is present at the center of the cell which is surrounded by cytoplasm. The presence of a cell wall and a large vacuole are the signs of plant cells.

So we can conclude that Cells are related to onion due to the presence of round shape and outer covering.

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Answer:

The triple bonds are the strongest and hence the shortest. Then comes double bonds which are of intermediate strength between the triple and single bonds. And finally the single bonds are weaker than the other two.

This way, Triple bonds are the shortest. Then comes double bonds. Finally, single bonds are the longest among the three.

The order of bond lengths is given as,

Triple bond < Double bond < Single bond

There is no specific threshold or degree of slope steepness at which soil erosion abruptly begins to taper off

Soil erosion is influenced by various factors, including slope steepness, rainfall intensity, soil characteristics, vegetation cover, and land management practices. As slope steepness increases, the potential for soil erosion generally increases due to the gravitational force acting on the eroded materials. However, there is no specific threshold or degree of slope steepness at which soil erosion abruptly begins to taper off. The relationship between slope steepness and soil erosion is generally non-linear. At low slope angles, soil erosion tends to be minimal as the gravitational force is relatively weak. As the slope angle increases, soil erosion typically increases exponentially due to the increased force of gravity. Eventually, as the slope steepness continues to increase, soil erosion may reach a point of maximum potential where the erodibility of the soil and other factors become limiting factors. Beyond this point, the rate of soil erosion may start to taper off, but it does not completely stop. Instead, it may stabilize or decrease slightly compared to the maximum erosion potential observed at steeper slopes.

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Answer:

1.31M

Explanation:

Based on the reaction, 1 mole of Zn produce 1 mole of ZnCl₂. As the reaction occurs completely, the moles of Zn added = Moles of ZnCl₂ produced. To find molarity we need the moles of ZnCl₂ and the volume of the solution in liters:

Moles Zn = Moles ZnCl₂ -Molar mass Zn: 65.38g/mol-:

15g * (1mol / 65.38g) = 0.23 moles of ZnCl₂

Volume in Liters:

175mL * (1L / 1000mL) = 0.175L

The molarity is:

0.23moles / 0.175L

Answer:

40

Correct option is A)

3dm

3

×

24 dm

3

1 mole

​

=0.125 moles of O

2

​

2H

2

​

O

2

​

⟶2H

2

​

O+O

2

​

2 moles of H

2

​

O

2

​

 produces 1 mole of O

2

​

.

0.125 moles of O

2

​

 requires 2×0.125 H

2

​

O

2

​

=0.25 moles of H

2

​

O

2

​

Concentration of H

2

​

O

2

​

=

0.1

0.25

​

=2.5 M

Hence, option A is correct.

Explanation:

Answer:

magnetic field

Explanation:

Answer:

The initial volume of the balloon is 3.41 L.

Explanation:

The gas laws are a set of chemical and physical laws that allow determining the behavior of gases in a closed system. The parameters evaluated in these laws are pressure, volume, temperature, and moles.

As the volume increases, the gas particles (atoms or molecules) take longer to reach the walls of the container and therefore collide with them fewer times per unit of time. This means that the pressure will be lower because it represents the frequency of collisions of the gas against the walls. In this way pressure and volume are related, determining Boyle's law which says:

"The volume occupied by a certain gaseous mass at constant temperature is inversely proportional to pressure"

Boyle's law is expressed mathematically as:

Pressure * Volume = constant

or P * V = k

Now it is possible to assume that you have a certain volume of gas V1 that is at a pressure P1 at the beginning of the experiment. If you vary the volume of gas to a new value V2, then the pressure will change to P2, and it will be fulfilled:

P1 * V1 = P2 * V2

In this case:

Replacing:

0.53 atm* V1= 0.42 atm* 4.3 L

Solving:

\(V1=\frac{0.42 atm* 4.3 L}{0.53 atm}\)

V1= 3.41 L

The initial volume of the balloon is 3.41 L.

Iodine is more soluble in carbon disulfide (cs2) than water .

Iodine is the heaviest of the stable halogen with the symbol I and atomic number 53.

It is a  colorless, neurotoxic, volatile liquid with the formula CS₂ and structure S=C=S. The chemical compound is frequently used in organic chemistry as well as an industrial and chemical non-polar solvent and as a building block.

As Iodine is the non polar solvent and non polar solvent best dissolves with non polar one. Hence Iodine is more soluble in carbon disulfide (cs2) than water  because water is a polar Solvent.

Hence, Iodine is more soluble in carbon disulfide (cs2) than water .

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Answer:

367.1 cm³

Explanation:

From the question given above, the following data were obtained:

Initial volume (V₁) = 300 cm³

Initial temperature (T₁) = 40 °C

Final temperature (T₂) = 110 °C

Final volume (V₂) =?

Next, we shall convert celsius temperature to Kelvin temperature. This can be obtained as follow:

T(K) = T(°C) + 273.15

Initial temperature (T₁) = 40 °C

Initial temperature (T₁) = 40 °C + 273.15

Initial temperature (T₁) = 313.15 K

Final temperature (T₂) = 110 °C

Final temperature (T₂) = 110 °C + 273.15

Final temperature (T₂) = 383.15 K

Finally, we shall determine the final volume (i.e the new volume) of the balloon. This can be obtained by using the Charles' law equation as illustrated below:

Initial volume (V₁) = 300 cm³

Initial temperature (T₁) = 313.15 K

Final temperature (T₂) = 383.15 K

Final volume (V₂) =?

V₁/T₁ = V₂/T₂

300 / 313.15 = V₂ / 383.15

Cross multiply

313.15 × V₂ = 300 × 383.15

313.15 × V₂ = 114945

Divide both side by 313.15

V₂ = 114945 / 313.15

V₂ = 367.1 cm³

Therefore, the new volume of the balloon is 367.1 cm³

When 2 mole of Fe2O3 and 9 molecules of CO react, 6 moles of the each product are created.

The term "mole" refers to a common scientific measurement unit for atoms, molecules, and other very small particles.

The first one is supposed to produce a balanced chemical reaction in accordance with the situation supplied.

FeO3 + 3 CO 2 Fe + 3CO2 is the formula.

Because 2 moles of Fe2O3 reacted with 3 x2=6 moles of Co to produce Fe and CO2, CO was in excess and Fe2O3 was the limiting reagent.

Utilize the mole ratio to determine the moles of the each product.

That is the Fe2O3 mole ratio: Because Fe is a 1:2 element, the mole of Fe is 2x2=4 moles.

Because the mole ratio of Fe2CO3 to CO2 is 1:3, the moles of Co2 are 2 x 3 = 6 moles.

Therefore, 6 moles of the each product will be created when 2 moles or Fe2O3 react to 9 moles of CO.

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Sublimation is an effective technique for the isolation of pure caffeine because: The purified caffeine will vaporize and can be collected as a solid, leaving impurities behind.

So, the answer is B.

Sublimation is a chemical technique that is used to isolate the pure form of a substance from impure or mixed form. It is the phase transition of a solid directly to a gas without passing through a liquid phase.

It is an effective technique for the isolation of pure caffeine due to the following reasons:During sublimation, the purified caffeine will vaporize and can be collected as a solid, leaving impurities behind.

The caffeine is heated, and the heat causes the solid to vaporize directly from the solid phase to the gas phase, skipping the liquid phase. Thus, it separates the caffeine from impurities and provides pure caffeine. Therefore, option B is correct.

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Answer:

c

Explanation:

As we know science is all about fact so from many years scientist use to predict the future or events so answer is in my opinion c

The PH₃ molecule is overall polar. Phosphine or PH₃ is polar that have nonpolar bonds.

Phosphine is a clear, flammable gas and a highly toxic compound.

We can say that Phosphine is polar as it has a bent structure due to its lone pair of electrons and electron-electron repulsion. The electronegativity of Ph is a nonpolar molecule but at the same time it has a lone pair of electrons, that is, PH₃ molecule.

When PH₃ has known to have 5 valence electrons and 3 hydrogen atoms in Ph, where the Hydrogen atom gives three electrons to the central atom P to meet the octet rule.

Thus the 2 valence electrons will form a negative region in pure P orbitals, while H will form a positive region.

Now that there is uneven charge distribution, the lone pair gives a strong dipole moment which makes the compound polar.

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Answer:To calculate the molar mass, first calculate the number of moles of gas using the ideal gas equation. 1 atm. 750 mmHg. (1.00 L). 760 mmHg. 0.0306 mol. L atm.

Explanation: