Mosely arranged Elements in an ascending order according to their atomic number by an increase........from the previous Element

1.) Rust forms when Fe, O₂, and H₂O react in the balanced equation below;

valentinak56 [21]

Answer:

1.) A.) The limiting reactant is Fe.

B.) 16.17 g.

2.) 84.70 %.

Explanation:

For the balanced equation:

2Fe(s) + O₂(g) + 2H₂O(l) → 2Fe(OH)₂(s).

2.0 moles of Fe reacts with 1.0 mole of oxygen and 2.0 moles of water to produce 2.0 moles of Fe(OH)₂.

A.) Which of these reactants is the limiting reagent?

To determine the limiting reactant, we should calculate the no. of moles of reactants using the relation: n = mass/molar mass.

Suppose that water is exist in excess.

no. of moles Fe = mass/atomic mass = (10.0 g)/(55.845 g/mol) = 0.179 mol ≅ 0.18 mol.

no. of moles of O₂ = mass/molar mass = (4.0 g)/(32.0 g/mol) = 0.125 mol.

Since from the balanced equation; every 2.0 moles of Fe reacts with 1.0 mole of oxygen.

So, 0.18 mol of Fe reacts with 0.09 mol of O₂.

Thus, the limiting reactant is Fe.

The reactant in excess is O₂ (0.125 mol - 0.09 mol = 0.035 mol).

B.) How many grams of Fe(OH)₂ are formed?

Using cross multiplication:

∵ 2.0 moles of Fe produce → 2.0 moles of Fe(OH)₂.

∴ 0.18 moles of Fe produce → 0.18 moles of Fe(OH)₂.

∴ The mass (no. of grams) of produced 0.18 mol of Fe(OH)₂ = no. of moles x molar mass = (0.18 mol)(89.86 g/mol) = 16.17 g.

2.) (Using the reaction listed in question 1.) If 2.00 g Fe is reacted with an excess of O₂ and H₂0, and a total of 2.74 g of Fe(OH)₂ is actually obtained, what is the % yield?

The % yield = [(actual mass/calculated mass)] x 100.

The actual mass = 2.74 g.

We need to calculate the theoretical mass:

Firstly, we should calculate the no. of moles of reactants using the relation: n = mass/molar mass.

no. of moles Fe = mass/atomic mass = (2.0 g)/(55.845 g/mol) = 0.0358 mol ≅ 0.036 mol.

Using cross multiplication:

∵ 2.0 moles of Fe produce → 2.0 moles of Fe(OH)₂.

∴ 0.036 moles of Fe produce → 0.036 moles of Fe(OH)₂.

∴ The calculated mass (no. of grams) of produced 0.036 mol of Fe(OH)₂ = no. of moles x molar mass = (0.036 mol)(89.86 g/mol) = 3.235 g.

∴ The % yield = [(actual mass/calculated mass)] x 100 = [(2.74 g/3.235 g)] x 100 = 84.70 %.

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What chemicals would be needed to create a mint that actually cleaned teeth while offering flavors and consumable chemicals? I'd

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ddddddddddddddddddddddddddddddddddddddddddddddddd

Explanation:

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Which of the following remains would be most likely only be found as a compression fossil?

attashe74 [19]

Answer:

A Leaf

Explanation:

Compressions are the way that leaves are fossilized as the leaves are pressed firmly between hard layers of rock.

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Which list places the layers of the sun in the correct order from innermost to outermost? Corona, photosphere, chromosphere Phot

Savatey [412]

Answer:

Layers of sun from inner to outermost layer-

Core<Radiative Zone<Convection Zone<Photosphere<Chromosphere<Transition Zone<Corona

Explanation:

The Sun is comprised of 7 layers, of which 3 forms the inner layers and 4 forms the outer layers.

The inner layers are namely-

Core- It is the innermost layer of the sun where the energy is produced by nuclear fusion process and the temperature is significantly high, about millions of degree celsius. Here, the hydrogens are combined in order to form helium .

Radiative zone- This is the zone through which the energy is radiated by the photon from the core outward in the form of electromagnetic radiation that usually takes more than about 170,000 years to radiate.

Convection zone- This layer starts from the interior of about 200,000 kilometers extending up to the visible surface of the sun. The temperature in this zone is extremely high but comparatively less than the core. The energy emitted from the core is then radiated through this zone. Here, the convection cells are generated due to the continuous heating and cooling of heated materials.

The outer layers of sun are as follows-

Photosphere- This layer is considered as the solar surface which is mostly concealed by the presence of granulations, that are initiated by the bubbles of gases formed in the convection zone and also presence of sunspots that are formed due to the stronger magnetic field. The temperature ranges here from 4000° to 6500°K.

Chromosphere- Here, the temperature rises extensively as one goes away from the sun and the temperature in this layer ranges from 4000° to a maximum of 8000°K.

Transition region- It is a thin layer which is about 60 miles only where the temperature highly increases from about 8000° to 500,000°K. The reason behind this increase in temperature is yet to be discovered.

Corona- It is the outermost layer where the temperature range is from 500,000° K to 1,000,000° K. This layer is difficult to be seen with the naked eye but can be seen using a coronagraph telescope during the time of solar eclipse.

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What is the rate law for step 1 of this reaction? express your answer in standard masteringchemistry notation. for example, if t

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