How many moles of co2 are produced when 5.20 mol of ethane are burned in an excess of oxygen?

Answer:

[tex]Keq =\frac{[H+]^{2} [SO4^{2-}]^{2}  }{[H2SO4]}[/tex]

Explanation:

The equilibrium constant K is a parameter that relates the concentration of products to that of the reactants at equilibrium and under a given temperature.

Consider a hypothetical reaction:

xA + yB ↔ zC

where A and B are the reactants ;  C is the product

x and y are the coefficients of the reactants; z is the product coefficient

The equilibrium constant is given as:

[tex]Keq = \frac{[C]^{z} }{[A]^{x}[B]^{y}}[/tex]

The given reaction is:

[tex]H2SO4(aq)\rightleftharpoons 2H+(aq)+ SO_{4}^{2-}(aq)[/tex]

[tex]Keq =\frac{[H+]^{2} [SO4^{2-}]^{2}}{[H2SO4]}[/tex]

Answer:  [tex]Na_2S+CdSO_4\rightarrow Cd_2S+Na_2SO_4[/tex]

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

Double displacement reaction is one in which exchange of ions take place.

The balanced chemical reaction will be:

[tex]Na_2S+CdSO_4\rightarrow Cd_2S+Na_2SO_4[/tex]

The heat of reaction for this system can be calculated using the formula: Heat of reaction = mass of the calorimeter x specific heat of the calorimeter x change in temperature.

The heat of the reaction for this system can be calculated using the formula:

Heat of reaction = mass of the calorimeter x specific heat of the calorimeter x change in temperature.

Plugging in the given values:

Using the formula, we can calculate:

Heat of reaction = 1.500 kg x 0.00252 J/kg•K x 0.985 K = 0.0037072 J

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The rate of the dihydrogen production is 0.0175 kg/sec for the given reaction.

The given reaction

[tex]\bold {CH_4 + H_2O \rightarrow CO + 3H_2}[/tex]

One mole of Methane is react with one mole of water to form 1 mole of CO and 3 moles of Hydrogen.

The rate of hydrogen production can be calculated from ideal gas law

[tex]\bold {pV = nRT}[/tex]

Where,

p- pressure = 0,86 atm · 101,325 kPa/atm = 87,14 kPa.

V- volume of methane =  159 L

T -  temperature= 294°C = 567 K.

R - gas constant = 8,314 J/K·mol.

n - number of moles = ?

Put the values in the formula, sole it for n,

[tex]\bold{n(CH₄) = \dfrac {pV} {RT}}\\\\\bold {n(CH₄) = \dfrac {87,14 kPa \times 159 L} {8,314 J/K.mol \times 567 K}.}\\\\\bold {n(CH₄) = 2,93 mol}[/tex]

Since, the molar ratio of methane to hydrogen is 3:1.

SO,

[tex]\bold {n(H_2) = 2,93 mol \times 3 }\\\\\bold {n (H_2) = 8,79 mol.}\\[/tex]

Hence, the mass of the dihydrogen produced,

[tex]\bold{ m(H_2) = 8.79 mol \times 2 g/mol.}\\\\\bold {m(H_2) = 17.58 g \times 0.001 kg/g}\\\\\bold {m(H_2) = 0.01758 kg}[/tex]

Therefore, the rate of the dihydrogen production is 0.0175 kg/sec for the given reaction.

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Final answer:

To find the molar mass of sucrose based on the freezing point depression, we first determine the molality of the solution from the observed freezing point depression and the freezing point depression constant of water. Then we calculate the number of moles of sucrose and finally divide the mass of sucrose dissolving by the number of moles to obtain the molar mass, which is 343.0 g/mol.

Explanation:

To calculate the molar mass of sucrose using freezing point depression, we utilize the formula ΔTf = i * Kf * m, where ΔTf is the change in freezing point, i is the van't Hoff factor (for sucrose, i = 1 since sucrose does not dissociate into ions), Kf is the freezing point depression constant for the solvent (water in this case), and m is the molality of the solution.

First, we need to determine the molality (m) of the sucrose solution. The freezing point depression observed is 0.77 degrees Celsius, and the freezing point depression constant (Kf) for water is 1.86 K/kg/mol. The molality is calculated using the observed ΔTf and Kf:

m = ΔTf / (Kf * i)

m = 0.77°C / (1.86°C*kg/mol)

m = 0.414 mol/kg

Now, convert the mass of the water to kilograms:

100g water = 0.1kg water

Next, calculate the number of moles of sucrose using the molality and mass of solvent:

n (moles of sucrose) = molality * mass of water (in kg)

n = 0.414 mol/kg * 0.1 kg

n = 0.0414 mol

Finally, calculate the molar mass of sucrose (M) by dividing the mass of sucrose used by the number of moles:

M = mass of sucrose / number of moles

M = 14.2g / 0.0414 mol

M = 343.0 g/mol

Therefore, the molar mass of sucrose is 343.0 g/mol.

Taking into account the definition of avogadro's number, 7.59×10⁻¹¹ moles of copper are 4.57×10¹³ atoms of copper.

Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.

Then you can apply the following rule of three: if 6.023×10²³ atoms are contained in 1 mole of copper, then 4.57×10¹³ atoms are contained in how many moles of copper?

amount of moles of copper= (4.57×10¹³ atoms × 1 mole)÷ 6.023×10²³ atoms

amount of moles of copper= 7.59×10⁻¹¹ moles

Finally, 7.59×10⁻¹¹ moles of copper are 4.57×10¹³ atoms of copper.

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Factor would you expect the reaction rate to increase at 25 C is [tex]1.8*10^{12}[/tex]

Suppose that a catalyst lowers the activation barrier of a reaction from 125 kj/mol to 57 kj/mol . Assume that the frequency factors for the catalyzed and uncatalyzed reactions are identical:  by what factor would you expect the reaction rate to increase at 25 C?

Catalysis is process of increasing the chemical reaction rate by adding a substance known as catalyst. Reaction rate is the speed at which a chemical reaction proceeds. Activation energy is the energy which must be provided to a chemical or nuclear system with potential reactants to result in chemical reaction, nuclear reaction, etc

The rates of reaction question in Kelvin [tex]25 C = 273 + 25 = 298 K[/tex]

The rate constants under catalysed and non‐catalysed conditions:

Catalysed: [tex]k_{cat} = A e^{\frac{-Ea(cat)}{RT} } = A e^{\frac{‐55000}{(8.314 x 298)}} = A e^{-22.2}[/tex]

Uncatalysed: [tex]k_{uncat} = A e^{\frac{-Ea(uncat)}{RT} } = A e^{\frac{‐125000}{8.314* 298} } = A e^{-50.4}[/tex]

Ratio of catalysed to uncatalysed reaction rates is

[tex]\frac{k_{cat}}{k_{uncat}} = \frac{Ae^{-22.2}}{Ae^{-50.4}}[/tex]

The A values are the same for both processes, therefore [tex]\frac{A}{A} = 1[/tex]

[tex]\frac{k_{cat}}{k_{uncat}} =\frac{e^_{-22.2}}{e^{-50.4}} = 1.8 * 10^{12}[/tex]

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The factor by which reaction rate is more in the presence of catalyst as compared to uncatalysed reaction is 1.8 × 10¹².

From the Arrhenius equation, we can calculate the effect of chnage in the activation energy as well as of temperature on the rate of the reaction.

Arrhenius equation will be represented as:

[tex]k = Ae^{-Ea/RT}[/tex], where

k = rate constant

A = frequency factor = 1 (given)

Ea = activation energy

R = universal gas constant = 8.314 J/ mol.K

T = temperature = 25 degree celsius = 298 K

Activation energy = 57 kJ/mol = 57000 J/mol

[tex]k1 = e^{-57000/8.314\times 298}[/tex] = [tex]e^{-22} \\[/tex]

Activation eneregy = 125 kJ/mol = 125000 J/mol

[tex]k2 = e^{-125000/8.314\times 298}[/tex] = [tex]e^{-50.4}[/tex]

Ratio of both the rates will be :

k1/k2 = [tex]e^{-22} \\[/tex] / [tex]e^{-50.4}[/tex] = 1.8 × 10¹²

Hence, the rate is 1.8 × 10¹² times more.

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Answer:

V_{solution}=0.355L

Explanation:

Hello,

Potassium bromide moles are computed as:

[tex]n_{KBr}=30.5gKBr*\frac{1molKBr}{119.9gKBr}=0.254gKBr[/tex]

Now, by recalling the molarity formula and solving for the volume, one obtains:

[tex]M=\frac{n_{KBr}}{V_{solution}} \\V_{solution}=\frac{n_{KBr}}{M}\\V_{solution}=\frac{0.254mol}{0.716mol/L}\\ V_{solution}=0.355L[/tex]

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Answer: Option (B) is the correct answer.

Explanation:

When vapors of a flammable or combustible liquid are mixed together with air in the presence of a source of ignition in proportions rapid combustion or an explosion can occur. The proper proportion is called the flammable or explosive range.

Boiling range is defined as the range of temperature which is involved distillation of oil from the starting time to the time till it evaporates.

The lowest temperature at which an ignitable mixture can be formed from a liquid in air near its surface.

Answer:

The correct answer is option A, that is, treating inherited diseases.

Explanation:

Genetic testing comprises testing the DNA, that is, the chemical database, which conducts instructions for the functions of the body. Investigation of genes can demonstrate modifications in the genes, which may lead to a disease or illness.  

If someone is exhibiting signs of a disease, which may be a result of genetic modifications, also known as mutated genes. Then in such cases, the examination of genes can show if one is exhibiting a suspected disorder. For example, genetic testing may be done to confirm a diagnosis of Huntington's disease or cystic fibrosis.  

The missing 500 joules of energy when burning 1,000 joules of coal are lost to inefficiencies in the energy conversion process, including factors like heat loss.

When 1,000 joules of coal is burned and only 500 joules of electricity is produced, the missing 500 joules of energy are lost primarily due to inefficiencies in the energy conversion process. This is a result of the Second Law of Thermodynamics, which states that when energy is transformed or transferred, part of it assumes a form that cannot be used to do work (often manifested as heat). In the context of a coal-fired power station, the energy undergoes several conversions: chemical energy from the coal is converted to thermal energy (heat), which is then converted to mechanical energy (turbines spinning), and finally converted to electrical energy.

The lost 500 joules of energy in the process are dissipated as heat into the environment, sound, and other forms of energy that are not useful in generating electricity. This comes from the inefficiency of the power plant, where some of the energy is unavoidably lost due to factors like friction, heat loss through conduction, convection, and radiation, and other resistive processes within the power generation system. Therefore, the efficiency of the power station is around 50% as it is only able to convert half of the energy content of the coal into electricity. Ex. In the case provided, a coal power plant with 1,000 joules of input energy from burning coal and an output of 500 joules of electrical energy would have an efficiency of 50%. This percentage is a simplified representation of many real-world power stations' efficiency, which tends to be around 30%-40%. It is also important to note that efforts to increase the efficiency of power stations can lead to more sustainable energy practices by reducing both waste energy output into the environment, which has ecological consequences, and the amount of coal required, which affects the release of CO2 emissions.

They can form a delta, because the river location B leads into the Gulf of Mexico.

The equation from which heat can be calculated is represented as:

q=mc\Delta T

Where, q=Heat (J)

m=mass of aluminium(g)

Delta T=Change in temperature(⁰C)

c=specific heat (J/g ⁰C)

Here ,

m=mass of aluminium(g)=0.3 g

Delta T=Change in temperature(⁰C)=150-30⁰C=120⁰C

c=0.9J/gC

Putting all the values in the above equation,

q=mc\Delta T

q=0.3×0.9×120

q=32.4 J

So, heat required will be 32.4 J.

The concentration of chloride ions in a saturated lead solution can be calculated using the given solubility and the stoichiometry of the dissolution reaction. The concentration is determined to be 1.3 × 10-6 M.

The concentration of chloride ions in a saturated solution is determined by the solubility product constant, Ksp, and the solubility of the particular compound. Using the provided information, the concentration of chloride ions is given as [Cl] = 7.6 × 10-³ M initially. However, with further calculations by applying quadratic equation and taking into account the dissolution stoichiometry, it is found that the concentration of chloride ions in the solution is [Cl] = 1.3 × 10-6 M. The composition of chlorine in its isotopic form is also considered which consists of 75.76% 35Cl and 24.24% 37Cl. Hence, consider all these factors when calculating the concentration of ions in a solution.

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The net chemical equation is 2 [tex]Cu_2S[/tex] (s) + 3 [tex]O_2[/tex] (g) + 2 C (s) → 4 Cu (s) + 2 [tex]SO_2[/tex] (g) + 2 CO (g).

The net chemical equation for the production of copper from copper(I) sulfide, oxygen, and carbon involves a two-step process: oxidation of copper(I) sulfide with oxygen followed by reduction of copper(I) oxide with carbon, yielding copper metal, sulfur dioxide, and carbon monoxide.

The extraction of copper from its ore involves a two-step process. The first step is the oxidation of copper(I) sulfide (chalcocite) with oxygen to form copper(I) oxide and sulfur dioxide. The second step is the reduction of copper(I) oxide with carbon to obtain copper metal and carbon monoxide.

Step 1: Oxidation of Copper(I) Sulfide

2 [tex]Cu_2S[/tex] (s) + 3 [tex]O_2[/tex] (g) → 2 [tex]Cu_2O[/tex] (s) + 2 [tex]SO_2[/tex] (g)

Step 2: Reduction of Copper(I) Oxide

2 [tex]Cu_2O[/tex] (s) + 2 C (s) → 4 Cu (s) + 2 CO (g)

By adding the balanced equations from both steps together and eliminating the intermediate product, copper(I) oxide, which appears on both sides, we get the net chemical equation for the production of copper:

Net Chemical Equation

2 [tex]Cu_2S[/tex] (s) + 3 [tex]O_2[/tex] (g) + 2 C (s) → 4 Cu (s) + 2 [tex]SO_2[/tex] (g) + 2 CO (g)

The question is:

There are two steps in the extraction of copper metal from chalcocite, a copper ore. In the first step, copper(I) sulfide and oxygen react to form copper(I) oxide and sulfur dioxide. In the second step, copper(I) oxide and carbon react to form copper and carbon monoxide.

Write the net chemical equation for the production of copper from copper(I) sulfide, oxygen and carbon. Be sure your equation is balanced.

Some metals lose their shine because of corrosion, a galvanic process involving oxidation by substances like oxygen.

The reason some metals lose their shine over time is due to a process known as corrosion, which is a galvanic process that leads to the deterioration of metals through oxidation. Metals like iron rust and silver tarnish when exposed to air because of their reaction with oxygen, forming oxides on the surface. However, gold does not corrode easily due to its resistance to oxidation by common substances.

Aluminum, although reactive, forms an aluminum oxide coating that protects it from further corrosion, while copper reacts with carbon dioxide to form a green patina that serves as a protective layer. Precious metals such as gold and platinum, known for their corrosion resistance and durability, defy normal oxidation and maintain their luster over time. They are impervious to most elements and can be corroded by only a few special fluids.

Answer:

Pollutant

Explanation:

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The most polar bond in acetic acid is [tex]\boxed{{\text{O - H bond}}}[/tex].

Further explanation:

Electronegativity:

The tendency of an atom to attract the shared electrons in the bond towards itself is known as electronegativity. The more electronegative atom will more attract the bonding electrons towards itself than the less electronegative one.

Higher the electronegativity value of the element more will be its tendency to accept an electron towards itself.

A polar bond is defined as a covalent bond between two atoms where the electrons that form the bond are unequally distributed. This is reason for the positive charge at one end and the negative charge at other end.

The bond or the molecular polarities are related to the electronegativity of the atoms or the molecules. The polarity of a bond is given by the difference in electronegativity between the two atoms that form polar bond

The factors on which the polarity of bonds depends are as follows:

1) Relative electronegativity of participating atoms:

Since the bond polarity involves pulling of electrons towards itself, hence a more electronegative element will be able to attract the electrons more towards it. As a result, the electrons will definitely move towards the more electronegative element.

2) The spatial arrangement of various bonds in the atom:

The shared pair of electrons also experience pulling force from the other bonded and non-bonded pair of electrons. This results in different bond polarities between same participating atoms that are present in different molecules. For example, bond polarity of O-H bond in a water molecule and acetic acid molecule is different. This is due to the different spatial arrangements of various bonds in the molecule.

Acetic acid also called as ethanoic acid is a colorless organic compound. It consists of methyl group that is bonded to carboxyl group.

The structure of acetic acid is attached in the image.

In acetic acid, two oxygen atoms are present in which one oxygen atom is double-bonded to carbon atom, and another one is single bonded to the carbon atom. Also, oxygen is bonded to hydrogen.

As oxygen is electronegative, the two oxygen atoms draw electron density away from the O-H bond and make the bond polar. Also, the electronegativity difference between oxygen and hydrogen is high due to which electrons are attracted towards oxygen and make the bond most polar.

Hence, in acetic acid O-H bond is most polar.

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Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Organic compounds

Keywords: acetic acid, polar bond, polarity, electronegativity, O-H bond, CH3COOH, and carboxylic group.

Final answer:

The O-H bond in acetic acid is the most polar due to a large difference in electronegativity between oxygen and hydrogen.

Explanation:

The bond in the acetic acid molecule CH3COOH that is the most polar is the O-H bond. This polarization is due to the difference in electronegativity between oxygen (3.5) and hydrogen (2.1), which is 1.4 according to the Pauling scale. This significant difference leads to a highly polar covalent bond, meaning the electrons are more attracted to the oxygen atom, giving it a partial negative charge and the hydrogen a partial positive charge.

Final answer:

The difference between ΔHrxn and ΔHf lies in their application; ΔHrxn measures the energy change in a reaction, while ΔHf pertains to the formation of a compound from its elements. The change in enthalpy per mole of a reaction is demonstrated experimentally through methods like calorimetry, which measures temperature changes.

Explanation:

Fundamentally, ΔHrxn and ΔHf differ in their application within thermodynamics. ΔHrxn, or the enthalpy change for a reaction, measures the overall energy change when reactants turn into products under constant pressure. This encompasses the total heat absorbed or released, calculated as the difference between the enthalpy of products and reactants. In contrast, ΔHf, or the standard enthalpy of formation, is the enthalpy change accompanying the formation of 1 mole of a substance from its elements in their most stable states, under standard conditions (1 bar, 298.15 K).

The part of the experiment that demonstrates the change in enthalpy per mole of a reaction typically involves measuring the temperature change of the surroundings or the system itself during a chemical reaction. This temperature change, coupled with the specific heat capacity of the system and the number of moles of reactants or products, allows us to calculate the enthalpy change. Therefore, experimental methods such as calorimetry can directly measure the enthalpy changes, providing insights into whether a reaction is endothermic or exothermic based on the ΔH values calculated.

Final answer:

Coal is formed from plant matter, while oil and natural gas are derived from marine organisms. A turbine produces electricity by spinning its blades with energy from different sources, transferring this motion to a generator.

Explanation:

The correct statement that compares the formation of coal to the way natural gas and oil are formed is: Coal results from the compressed remains of plant matter. Both oil and natural gas are compressed remains of marine organisms. So the correct answer is B. Coal, oil, and natural gas are all fossil fuels, but they form from different types of organic matter and under varying conditions of heat and pressure.

Coal is typically found as coal seams within rock layers and is formed from ancient swamp vegetation, whereas oil and natural gas originated from microorganisms in prehistoric water bodies and are often found together due to their similar formation processes.

A turbine works to produce energy for electricity by harnessing energy from various sources, such as the wind, water flow, or steam generated from the combustion of fossil fuels, to spin its blades. This motion is transferred to a generator, which converts the kinetic energy into electrical energy. The correct answer that describes this process is A: Energy from sources such as wind or from burning fossil fuels is used to spin the blades of the turbine. The turbine then powers a generator which produces electricity.

Answer:

Both are formed by gravitational forces.

Explanation:

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the term for a solid when two solutions are mixed is  a percipitate