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A student is given the electrochemical cell reaction:MnO4-(aq) + 8H+(aq) + 5e- → Mn2+(aq) + 4H2O(l)Calculate the standard potential (in volts) of the cell at 25°C given that the standard reduction potential of MnO4-(aq)/Mn2+(aq) couple and the standard reduction potential of the H+(aq)/H2(g) couple are +1.51 V and 0.00 V, respectively. The concentration of MnO4-(aq) is 0.010 M and that of H+(aq) is 1.00 M.

asked Jan 22 in ElectroChemistry by AlfonsoJanze (1.9k points)

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1 answer 97 views

A student needs to prepare 500 mL of a buffer solution with a pH of 7.5 using a weak acid HA and its conjugate base A-. HA has a pKa of 4.5 and its initial concentration is 0.2 M. What mass of HA and A- should be mixed to prepare the buffer solution?

asked Jan 22 in Chemical reactions by DeenaTrundle (2.2k points)

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1 answer 139 views

What is the major product(s) of the following nucleophilic substitution reaction between 1-bromopropane and sodium ethoxide in ethanol: 1-bromopropane + sodium ethoxide → ? + sodium bromide

asked Jan 21 in Organic Chemistry by DebbraCarder (2.3k points)

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1 answer 140 views

What is the boiling point of cyclohexane and n-hexane? How do their boiling points compare?

asked Jan 21 in Organic Chemistry by RigobertoWat (1.5k points)

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1 answer 65 views

Calculate the corrosion current density for a zinc-copper galvanic couple, with a surface area of 10 cm² each, immersed in a 0.1 M copper sulfate solution and a 0.1 M zinc sulfate solution, respectively. Given that the exchange current density for the zinc and copper electrodes are 0.0035 A/cm² and 0.1184 A/cm², respectively, What will be the corrosion rate for the zinc electrode in micrometers per year?

asked Jan 23 in ElectroChemistry by SherrylP401 (2.4k points)

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1 answer 105 views

A chemistry student needs to determine the effect on the equilibrium position of a chemical reaction when the concentration of a reactant is decreased. The student is given the balanced equation: N₂(g) + 3H₂(g) ⇌ 2NH₃(g) + heatIf the concentration of H₂ is decreased by removing 50% of its concentration, what would be the effect on the concentration of N₂, NH₃, and the position of equilibrium?

asked Jan 22 in Chemical reactions by MerryR11813 (1.7k points)

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1 answer 59 views

Calculate the enthalpy of adsorption of methane gas on activated charcoal at room temperature (25°C) given the following information:- The saturation pressure of methane at 25°C is 3.78 MPa.- The surface area of activated charcoal used is 100 m²/g.- The amount of methane adsorbed on the activated charcoal is 5 mmol/g.

asked Jan 23 in ThermoChemistry by IvyHogan8844 (1.6k points)

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1 answer 143 views

What is the systematic name of the organic compound with the molecular formula C5H10O and a carbonyl functional group attached to the 2nd carbon atom of the chain?

asked Jan 21 in Organic Chemistry by TrevorE07525 (2.2k points)

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1 answer 66 views

Calculate the bond dissociation energy for the H-H bond, given that the average H-H bond energy is 436 kJ/mol. Show all the steps in your calculation.

asked Jan 23 in Chemical bonding by PatsyRubin2 (2.2k points)

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1 answer 140 views

Identify and classify the isomers of the compound C6H12O that possess a functional group of ketone. Provide their respective structural formulas and explain how they differ from one another.

asked Jan 21 in Organic Chemistry by JacquelynWil (1.7k points)

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1 answer 65 views

Calculate the bond order and bond length of the N-O bond in the nitrite ion (NO2-).

asked Jan 23 in Inorganic Chemistry by ZellaSeamon3 (1.6k points)

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1 answer 111 views

A battery consists of a Zinc electrode and a Copper electrode. Calculate the exchange current density at the Zinc electrode if the concentration of Zinc ion in its solution is 0.1 M and the potential difference between the electrodes is 1.5 V. The standard electrode potential for Zinc is -0.76 V and the transfer coefficient for the electrode reaction is 0.5.

asked Jan 22 in ElectroChemistry by DarbyJackey7 (1.4k points)

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1 answer 106 views

A chemist has a sample of an unknown compound with a mass of 5.00 g. After analyzing the sample, the following results were obtained: 0.50 g of oxygen, 1.25 g of carbon, and 3.25 g of hydrogen. Calculate the molecular formula of the unknown compound using mass balance calculations.

asked Jan 22 in Analytical Chemistry by KreogMoore5 (6.4k points)

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1 answer 108 views

A chemical engineering company has a mixture of ethanol and water with a concentration of 30% ethanol to separate using a distillation column. The company needs to obtain a concentration of 80% ethanol in the distillate at a reflux ratio of 3. Calculate the number of theoretical plates required in the column for the separation, assuming no vapor or liquid bypass, and that the minimum vapor velocity is maintained.

asked Jan 22 in Chemical engineering by SvenJonathan (1.9k points)

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1 answer 93 views

A student wants to calculate the reaction quotient, Q, for the following chemical reaction at 298 K:2H2(g) + O2(g) ⇌ 2H2O(g)If the partial pressures of H2, O2, and H2O are 0.25 atm, 0.15 atm, and 0.1 atm, respectively, what is the value of Q?

asked Jan 22 in Chemical thermodynamics by LouiePartrid (1.8k points)

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1 answer 104 views

A chemistry student needs to determine the effect of an increase in temperature on the equilibrium concentration of products and reactants for the reaction N2(g) + 3H2(g) ⇌ 2NH3(g). Calculate the new concentration of NH3 at equilibrium when the temperature is raised from 300 K to 400 K.

asked Jan 22 in Chemical equilibrium by FilomenaWago (1.8k points)

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1 answer 60 views

Calculate the enthalpy change for the hydrolysis of 2 moles of sucrose (C12H22O11) if it releases 5184 kJ/mol of energy.

asked Jan 23 in ThermoChemistry by JulianaKane (2.2k points)

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1 answer 96 views

A student needs to calculate the Faraday constant for the reduction of copper ions in a solution using a current of 2.5 amperes for 5 minutes. If the mass of copper deposited on the cathode was 0.3 grams, what is the value of the Faraday constant?

asked Jan 22 in ElectroChemistry by MerissaGxv8 (1.7k points)

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1 answer 63 views

Calculate the corrosion rate of a steel rod when it is placed in a galvanic coupling with a copper strip at 25°C. The initial weight of the steel rod was 28.6 g and it lost 0.48 g in weight after 24 hours of exposure. The area of the steel rod in contact with the electrolyte solution is 3.14 cm² and the electrode potential of the copper strip is +0.34V while the electrode potential of the steel rod is -0.44V. Using Faraday’s law of electrolysis, determine the corrosion rate of the steel rod in mmpy (mils per year).

asked Jan 23 in ElectroChemistry by DeanneMack98 (2.1k points)

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1 answer 60 views

Calculate the enthalpy change for the complete combustion of 5 grams of methane gas (CH4) given that the enthalpy of formation for CH4 is -74.8 kJ/mol and the enthalpy of formation for H2O is -285.8 kJ/mol.

asked Jan 23 in ThermoChemistry by JoyGlauert80 (2.0k points)

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