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Ethyne or acetylene is also used in cutting torches. The acetylene is combined with pure oxygen producing a flame with a temperature of 6332 °F or 3500 °C. The combustion of acetylene in the presence of excess oxygen yields carbon dioxide and water:

2C2H2 (g) + 5O2 (g) --> 4CO2 (g) + 2H2O (l)

Calculate the value of ΔS° for this reaction.


A. +689.3 J/mol K

B. +432.4 J/mol K

C. -432.4 J/mol K

D. -122.3 J/mol K

Answer:

See Explanation

Explanation:

In thermodynamics theory the Free Energy (ΔG) of a chemical system is described by the expression ΔG = ΔG° + RTlnQ. When chemical system is at equilibrium ΔG = 0. Substituting into the system expression gives ...

0 = ΔG° + RTlnKc, which rearranges to ΔG° = - RTlnKc.  ΔG° in electrochemical terms gives ΔG° = - nFE°, where n = charge transfer, F = Faraday Constant = 96,500 amp·sec and E° = Standard Reduction Potential of the electrochemical system of interest.

Substituting into the ΔG° expression above gives

-nFE°(cell) = -RTlnKc => E°(cell) = (-RT/-nF)lnKc = (2.303·R·T/n·F)logKc

=> E°(cell) = (0.0592/n)logKc = E°(Reduction) - E°(Oxidation)

Application example:

Calculate the Kc value for a Zinc/Copper electrochemical cell.

Zn° => Zn⁺² + 2e⁻  ;    E°(Zn) = -0.76 volt  

Cu° => Cu⁺² + 2e⁻ ;    E°(Cu) =  0.34 volt

By natural process, charge transfer occurs from the more negative reduction potential to the more positive reduction potential.

That is,

           Zn° => Zn⁺² + 2e⁻ (Oxidation Rxn)

Cu⁺² + 2e⁻ => Cu°             (Reduction Rxn)

E°(Zn/Cu) = (0.0592/n)logKc

= (0.0592/2)logKc = E°(Cu) - E°(Zn) = 0.34v - (-0.76v) = 1.10v

=> logKc = 2(1.10)/0.0592 = 37.2

=> Kc = 10³⁷°² = 1.45 x 10³⁷

Given the reaction N2 + 3H2 -->2NH3, what volume of hydrogen is necessary to react with five liters of nitrogen to produce ammonia, assuming constant temperature and pressure? How would you calculate the mass in grams of hydrogen chloride produced when 4.9 L of molecular hydrogen at STP reacts with an excess of chlorine gas.?

Answer:

O D. 4

Explanation:

A carbon atom is an element that can be found in the atomic number 6th of the periodic table. It electronic configuration is 1s² 2s² 2p². It is a tetravalent and non metallic compound. In its outermost structure, Carbon needs four additional valence electrons to complete its octet structure. That is why hydrogen with only one electron can be bonded to one carbon atom in four different places making the carbon element obtain a tetrahedral shape.

Answer:

... x M x V. • Example: Prepare 800 mL of 2 M sodium chloride. ... solutions are indicated by w/v% and are defined as the grams of solute per ...

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Answer:

25.1 g

Explanation:

Step 1: Write the balanced decomposition reaction

2 HBr(aq) ⇒ H₂(g) + Br₂(l)

Step 2: Calculate the moles corresponding to 24.7 g of Br₂

The molar mass of Br₂ is 159.81 g/mol.

24.7 g × 1 mol/159.81 g = 0.155 mol

Step 3: Calculate the moles of HBr needed to produce 0.155 moles of Br₂

The molar ratio of HBr to Br₂ is 2:1. The moles of HBr needed are 2/1 × 0.155 mol = 0.310 mol.

Step 4: Calculate the mass corresponding to 0.310 moles of HBr

The molar mass of HBr is 80.91 g/mol.

0.310 mol × 80.91 g/mol = 25.1 g

Answer:

[tex]Ksp=5.20x10^{-6}[/tex]

Explanation:

Hello there!

In this case, according to the solubility equilibrium of calcium hydroxide:

[tex]Ca(OH)_2\rightleftharpoons Ca^{2+}+2OH^-[/tex]

Whereas the equilibrium expression is:

[tex]Ksp=[Ca^{2+}][OH^-]^2[/tex]

It is firstly necessary to calculate the molar solubility given the grams and volume of the dissolved solute:

[tex]s=\frac{0.186g/(74.09g/mol)}{0.230L}=0.0109M[/tex]

Now, according to the Ksp expression, we plug in s as the solubility to obtain:

[tex]Ksp=(s)(2s)^2\\\\Ksp=(0.109)(2*0.0109)^2\\\\Ksp=5.20x10^{-6}[/tex]

Regards!

According to the solution equilibrium,

Now,

The molar solubility will be:

→ [tex]s = \frac{\frac{0.186}{74.09} }{0.230}[/tex]

     [tex]= 0.0109 \ M[/tex]

hence,

The Ksp value will be:

→ [tex]Ksp = (s)(2s)^2[/tex]

By substituting the values,

          [tex]= (0.109)(2\times 0.0109)^2[/tex]

          [tex]= 5.20\times 10^{-6}[/tex]

Thus the above approach is right.

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Answer: The answer is F

The answer is F , F shows the amount of energy the reactants need to gain to become products .

A potential energy diagram shows the change in potential energy of a system as reactants are converted into products.

From the figure attached we can understand the Eₐ is the activation energy reactants need to get converted into products.

Now when we study the figure( potential energy Diagram) given in the question ,

The reactants are energy level shown by G

The total energy required to get converted into products is denoted by H while ,

H - G is the actual energy required which is denoted by F.

Therefore F shows the amount of energy the reactants need to gain to become products .

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Answer:

the rate at which reactants form products is the same as the rate at which products form reactants

Explanation:

There is still  a reaction happening just that the second one happens the opposite happens and keeps it at net 0

Answer:

..............,.,.,.,,..,,.,.,

Answer:

1. 0.82 gram of Ag+

2. 4.79 g of Ag₂O₃S

Explanation:

From the given information:

Total amount of Ag₂O₃S = 2.24 grams

Atomic mass of Ag+ =107.86 g/mole

molar mass of Ag₂O₃S = 295.8  g/mole

∴

The mass of the Silver (Ag) in grams is:

[tex]= Total\ amount \ of \ Ag^+ \times \dfrac{107.86 \ g/mol}{295.8 \ g/mol}[/tex]

[tex]=2.24 \times \dfrac{107.86 \ g/mol}{295.8 \ g/mol}[/tex]

= 0.82 gram of Ag+

2.

Here, the total amount of Ag₂O₃S = unknown

Atomic mass of Ag+ = 107.86 g/mole

molar mass of Ag₂O₃S = 295.8 g/mole

amount of Ag+  = 1.75 g

∴

The mass of Ag₂O₃S = [tex]Total \ amount \ of \ Ag^+ \times \dfrac{295.8 \ g/mol}{107.86\ g/mol}[/tex]

[tex]=1.75 \times \dfrac{295.8 \ g/mol}{107.86\ g/mol}[/tex]

= 4.79 g of Ag₂O₃S

Answer:

A) and D)

Explanation:

I just completed this assignment and these are the correct options!

In the given image, the compounds that represents ether are option 1 and 4, respectively.

Ether is a class of organic compounds that contain an oxygen atom bonded to two alkyl or aryl groups. The general formula for ethers is [tex]\rm R-O-R'[/tex], where R and R' are alkyl or aryl groups.

Therefore, compound 1 and compound 4 represents ether. The correct answer is option 1 and 4, respectively.

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240 g of water (specific heat = 4.186 J/g°C, initial temperature = 20°C) is mixed with an unknown mass of iron (specific heat = 0.444 J/gºC, initial temperature 500°C). When equilibrium is reached,The answer for this would be 69.6

You use q = mcΔT, but you assume aluminum = water and crack for This the final temperature.

We need to look up heat values (c) for aluminum and h20. This will uses 0.901 for aluminum and 4.18 use water

: (10)(130 - T)(0.901) = (200.0)(T - 25 (6)

Hence, The answer for this would be 69.6.  

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Answer:

convection

hope this helps

have a good day :)

Explanation:

Answer:

Synthesis or combination.

Explanation:

Hello there!

In this case, according to the given chart containing the types of reactions, it turns out possible for us infer this given reaction:

____ N2+__H2→ __NH3

Is synthesis or combination, because it follows the pattern A + B --> C. Moreover, it can be balanced as shown below:

N2+3H2→ 2NH3

Regards!

Answer:

CDE

Explanation:

If your on USA test perp

The questions are most relevant to increasing the strength of the electromagnet are Does increase the current in .....?, Will increasing the number of loops of wire around the.....? and Will positioning the loops of….? Therefore, option C, D and E are correct.

The characteristics known as electromagnetic properties determine how quickly a substance will absorb or emit electromagnetic radiations.

We may be familiar with electromagnetic radiations such as radio waves, microwaves, ultraviolet rays, infrared rays, and visible light rays.

Transverse waves characterize electromagnetic radiation.They move across fluctuating magnetic and electric fields so that they are perpendicular to the wave's path of propagation and at right angles to one other.

Thus, option C, D and E are correct.

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Answer: A. Elements with intermediate numbers of valence electrons are the least reactive.

Explanation: I Quizzed

Answer:

d.) granulated

Because the granulated sugar has a greater surface area.

Answer:

(edit: nvm I figured it out, here is the answer)

Explanation:

Ions exists bound together in ionic formulae by electrostatic attraction then the ionic formula exists MgO.

The diagrams known as Lewis structures, also referred to as Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures, depict the interactions between the atoms in a molecule as well as any lone pairs of electrons that may be present.

A chemical compound comprehended as an ionic compound in chemistry exists one that contains ions bound together by the electrostatic forces named as ionic bonding. The molecule exists often neutral despite containing both positively and negatively charged ions, or cations and anions. Ions exists bound together in ionic formulae by electrostatic attraction.

Magnesium and oxygen:

Cation [tex]$=\mathrm{Mg}^{2+}$[/tex]

Anion [tex]$=\mathrm{O}^{2-}$[/tex]

Net charge = + 2 - 2 = 0

Formula = MgO

Therefore, the ionic formula exists MgO.

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Answer:

Cr+Cu2 -> Cr2+Cu

2Ag+Fe->2Ag+Fe2

Explanation: I did the assessment

Answer: At a pressure of 15.613 atm a 5.32 mol [tex]Cl_{2}[/tex] sample occupy 5.08 L at 181.59 K.

Explanation:

Given: Moles = 5.32 mol

Volume = 5.08 L

Temperature = 181.59 K

Formula used to calculate the pressure is as follows.

PV = nRT

where,

P = pressure

V = volume

n = no. of moles

R = gas constant = 0.0821 L atm/mol K

T = temperature

Substitute the values into above formula as follows.

[tex]PV = nRT\\P \times 5.08 L = 5.32 mol \times 0.0821 L atm/mol K \times 181.59 K\\P = \frac{5.32 mol \times 0.0821 L atm/mol K \times 181.59 K}{5.08 L}\\= 15.613 atm[/tex]

Thus, we can conclude that at a pressure of 15.613 atm a 5.32 mol [tex]Cl_{2}[/tex] sample occupy 5.08 L at 181.59 K.

Answer:

They cause boys' and girls' bodies to develop

Answer:

LiCl.

Explanation:

Hello there!

In this case, since it is known that the ionic compounds are specially formed between metals and nonmetals, it is possible for us to discard CO and PCl5 as they have both nonmetals.

On the other hand, since the bonds between nonmetals and transition metals like iron and copper may not be completely ionic due to the electronegativity trend, we infer that the most likely ionic compound is LiCl because of the large electronegativity difference.

Regards!

Answer:

82gS

Explanation:

2 Fe  + 3 S  →  Fe2S3

          ↓      ↑  

       mol → mol

        Fe         S

[tex]\frac{95 g Fe }{} \frac{1 mol Fe }{55.85 g Fe } \frac{3 mol S }{2 mol Fe } \frac{32.07 g S}{1 mol S} = 82 g S[/tex]

The statement that is correct about Urban areas is that they have higher temperatures.

Urban Area is a term to refer to cities. Urban areas are characterized by having a developed infrastructure (wide roads, vehicular bridges, wide platforms, tall buildings, residential areas, industrial areas, among others).

Recent studies affirm that urban areas are warmer than surrounding areas; This phenomenon is because the materials with are built buildings, roads, houses, and others, concentrate the sun's rays, increasing the temperature of cities. In addition, the lack of trees deepens this phenomenon, because the trees contribute to cooling by physicochemical processes such as evapotranspiration.

According to the above, it is possible to affirm that urban areas are hotter than their surrounding area because they lack vegetation, and the materials with which it is built contribute to the increase in temperature.

On the other hand, urban areas are characterized by habitat fragmentation, more problems with soil erosion, and less rain infiltration into the soil.

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Answer:

A) higher temps

Explanation:

Answer:

Since energy can’t be created or destroyed, and water loses potential energy when it freezes to form ice. The energy remains electrical but then changes to kinetic when Enough energy is released.

Explanation:

The excess electrical energy gained by water during ice forming process is removed as potential energy to maintain law of conservation of energy.

According to the principle of conservation of energy, energy can neither be created nor destroyed but can transformed from one form to energy.

The electrical energy used by the ice maker to freeze water works on the same principle of conservation of energy.

Thus, the excess electrical energy gained by water during ice forming process is removed as potential energy to maintain law of conservation of energy.

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Answer:

True! A transverse wave does move a medium at an obtuse angle to the wave!!

Answer:

False

Explanation:

Answer:

See Explanation

Explanation:

The reaction equation is

3H2(g) + N2(g) -----> 2NH3(g)

1)If 1 mole of N2 yields 2 moles of NH3

12 moles of N2 will yield 12 * 2/1 = 24 moles of NH3

2) 3 moles of nitrogen reacts with 1 mole of nitrogen

6 moles of hydrogen will react with 6 * 1/3 = 2 moles of nitrogen

3) The limiting reactant yields the least amount of product

If 1 mole of nitrogen yields 2 moles of NH3

40 moles of nitrogen yields 40 * 2/1 = 80 moles of NH3

If 3 moles of hydrogen yields 2 moles of NH3

30 moles of hydrogen yields 30 * 2/3 = 20 moles of NH3

Hence hydrogen is the limiting reactant

4) Number of moles in 80g of NH3 = 80g/17g/mol = 4.71 moles

3 moles of hydrogen produces 2 moles of ammonia

x moles of hydrogen produces 4.71 moles of ammonia

x = 3 * 4.71/2 = 7.065 moles of hydrogen

Mass = 7.065 moles of hydrogen * 2 g/mol

Mass = 14.13 g of hydrogen