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2 years ago

Please help asap! giving brainliest to correct answer!!

Chemistry

1 answer:

vlabodo [156]2 years ago

4 0

Answer:

D. C₄H₁₀ and C₂H₅

<h2>What is a empirical formula?</h2>

A chemical formula indicating the elements of a compound and their relative proportions, as (CH₂O)n.

Since an empirical formula indicates the ratio (proportions) of the elements in the compound, it can be used, along with the molar weight of the compound, to determine the molecular formula.

The empirical formula provides the smallest whole-number ratio among elements or compounds within a molecular compound. A compound is a chemical formed from atoms of different chemical elements.

Hence, Option D is correct.

#SPJ2

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Many computer chips are manufactured from silicon, which occurs in nature as SiO2. When SiO2 is heated to melting, it reacts wit

guajiro [1.7K]

Answer:

a) The limiting reagent in this reaction is SiO₂ .

b) The theoretical yield of Si from this reaction = 72,494.85 g = 72.5 kg

c) The percent yield of Si from this reaction = 91%

Explanation:

a) The limiting reagent is the reagent whose amount at the start of the reaction is in shortage according to the stoichiometric balance. It is is the reactant that determines how much of other reactants will react and how much products will be formed. It is theoretically, completely used up in the reaction.

The non-limiting reagent is usually in excess according to the stoichiometric balance.

154.9 kg of SiO2 is allowed to react with 78.0 kg of carbon to produce 66.0 kg of silicon.

The balanced equation for the reaction is

SiO₂ + 2C -------> Si + 2CO

1 mole of SiO₂ reacts with 2 moles of C according to the stoichiometric balance

To obtain which reactant is in excess and which one is the limiting reagent, we have to find the number of moles of reactant present at the start of the reaction.

Number of moles = (mass)/(molar mass)

For SiO₂, mass = 154.9 kg = 154,900 g, Molar mass = 60.02 g/mol

Number of moles = (154900/60.02)

Number of moles = 2580.81 moles

For Carbon, mass = 78.0 kg = 78,000 g, Molar mass = 12.011 g/mol

Number of moles = (78000/12)

Number of moles = 6494.05 moles

Recall, 1 mole of SiO₂ reacts with 2 moles of C

If Carbon was the limiting reagent,

6494.05 moles of Carbon would require (6494.05/2) moles of SiO₂ to react; 3247.025 moles of SiO₂. Which is more than the available number of moles of SiO₂ at the start of the reaction. Hence, Carbon isn't the limiting reagent.

SiO₂ as the limiting reagent,

1 mole of SiO₂ reacts with 2 moles of Carbon,

2580.81 moles of SiO₂ would react with (2×2580.81) moles of Carbon; 5161.62 moles of Carbon. Which is in the limit of available number of moles of Carbon at the start of the reaction. Hence, SiO₂ is the limiting reagent which determines which amount of other reactants react and the amount of products formed.

b) Theoretical yield of Si in the reaction.

SiO₂ + 2C -------> Si + 2CO

SiO₂ being the limiting reagent.

1 mole of SiO₂ gives 1 mole of Si,

2580.81 moles of SiO₂ will give 2580.81 moles of Si.

Mass produced = (number of moles produced) × (Molar mass)

Number of moles of Si produced = 2580.81 moles

Molar mass of Si = 28.09 g/mol

Theoretical mass of Si produced = (2580.81) × (28.09) = 72494.85 g = 72.5 kg

c) Percemt yield of Si

Percent yield = 100% × (Actual yield)/(Theoretical yield)

Actual yield of Si = 66 kg

Theoretical yield of Si = 72.49485 kg

Percent yield = 100% × (66/72.49485)

Percent yield = 91.04% = 91%

Hope this Helps!!!

8 0

3 years ago

Read 2 more answers

The volume of a gas is 550 mL at 960 mm Hg and 200.0 C. What volume

Masja [62]

Answer:

The volume will be 568.89 mL.

Explanation:

Boyle's law says that "The volume occupied by a given gaseous mass at constant temperature is inversely proportional to pressure"

Boyle's law is expressed mathematically as:

Pressure * Volume = constant

or P * V = k

Gay-Lussac's law indicates that when there is a constant volume, as the temperature increases, the pressure of the gas increases. And when the temperature is decreased, the pressure of the gas decreases. That is, the pressure of the gas is directly proportional to its temperature. Gay-Lussac's law can be expressed mathematically as follows:

$\frac{P}{T}=k$

Where P = pressure, T = temperature, K = Constant

Finally, Charles's law indicates that as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases. In summary, Charles's law is a law that says that when the amount of gas and pressure are kept constant, the quotient that exists between the volume and the temperature will always have the same value:

$\frac{V}{T}=k$

Combined law equation is the combination of three gas laws called Boyle's, Charlie's and Gay-Lusac's law:

$\frac{P*V}{T} =k$

Studying an initial state 1 and a final state 2, it is fulfilled:

$\frac{P1*V1}{T1} =\frac{P2*V2}{T2}$

In this case:

P1= 960 mmHg
V1= 550 mL
T1= 200 C= 473 K (being 0 C=273 K)
P2= 830 mmHg
V2= ?
T2= 150 C= 423 K

Replacing:

$\frac{960 mmHg*550 mL}{473K} =\frac{830 mmHg*V2}{423 K}$

Solving:

$V2=\frac{423 K}{830 mmHg} *\frac{960 mmHg*550 mL}{473K}$

V2= 568.9 mL

<u><em>The volume will be 568.89 mL.</em></u>

4 0

3 years ago

Find the energy of the photon if the frequency is 1.97 × 10^8 s^-1

enot [183]

E=hv
=6.625×10^-34Js^-1×1.97×10^8s^-1
Cancel sec inverse.
=13.05×10^-26.

7 0

3 years ago

if an iron nail is placed in a glass of water the nail will sink. Is the density of iron smaller than or larger than the density

Gala2k [10]

It has more density when it sinks because the water pushes away thats why people float they are less dense

5 0

3 years ago

Choose the statement below that is TRUE. Question 7 options: The term "strong electrolyte" means that the substance is extremely

Setler [38]

Answer: A weak acid solution consists of mostly nonionized acid molecules.

Explanation:

Strong electrolytes are those solutions which undergo complete dissociation when dissolved in water. The dissociation of strong electrolytes is given by a right arrow.

Weak electrolytes are those solutions which do not undergo complete dissociation when dissolved in water. The dissociation of weak electrolytes is given by a rightleft arrow.

Weak acids are those substances which dissociate partially to give $H^+$ ions when dissolved in water. Thus most of molecules remain unionized in solutions.

$CH_3COOH\rightleftharpoons CH_3COO^-+H^+$

Strong acids are those substances which dissociate completely to give $H^+$ ions when dissolved in water.

$HNO_3(aq.)\rightarrow H^+(aq.)+NO_3^-(aq.)$

3 0

3 years ago