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What is the exchange current density for a corroding iron electrode in a 0.1 M solution of Fe2+ ions at 25°C, given that the rate constant for the electrode reaction is 1.2 x 10^-9 cm/s and the standard reduction potential for Fe2+/Fe is -0.44 V?

asked Mar 1 in ElectroChemistry by TheScientist (138k points)

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What is the pH of a solution that has a hydrogen ion concentration of 2.5 x 10^-7 M? Determine the pH using a pH meter and state whether the solution is acidic, neutral, or basic based on the calculated pH value.

asked Mar 1 in Analytical Chemistry by TheScientist (138k points)

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What is the Gibbs free energy change for the formation of 2 moles of water molecules from hydrogen gas and oxygen gas at standard conditions (298 K and 1 atm pressure)? Give the answer in kJ/mol.

asked Mar 1 in Chemical thermodynamics by TheScientist (138k points)

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What is the standard Gibbs free energy change at 298 K for the reaction A + 2B → 2C if the standard Gibbs free energy of formation for A, B, and C are 100 kJ/mol, -50 kJ/mol, and -120 kJ/mol, respectively?

asked Mar 1 in Chemical thermodynamics by TheScientist (138k points)

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What is the standard enthalpy change for the neutralization of 25.0 mL of 0.100 M hydrochloric acid with 25.0 mL of 0.100 M sodium hydroxide, given that the specific heat capacity of the solution is 4.18 J/g°C and the temperature change is 5.0°C?

asked Mar 1 in Chemical thermodynamics by TheScientist (138k points)

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How does thermal analysis (TA) help in the analysis and characterization of polymers? Provide a detailed explanation of the various TA techniques and their applications in polymer chemistry.

asked Mar 1 in Polymer Chemistry by TheScientist (138k points)

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What is the entropy change (∆S) for the following reaction?2H2(g) + O2(g) → 2H2O(l)Given that the standard molar entropy of H2(g), O2(g), and H2O(l) are 131.3 J/K•mol, 205.0 J/K•mol, and 70.0 J/K•mol respectively.

asked Mar 1 in Chemical thermodynamics by TheScientist (138k points)

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What is the pH of a 0.1 M solution of hydrochloric acid (HCl) at 25°C, measured using a pH meter with a sensitivity of 0.01 pH units?

asked Mar 1 in Analytical Chemistry by TheScientist (138k points)

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What is the enthalpy change when 1.50 moles of methane (CH4) is burned in excess oxygen gas (O2) under standard conditions, if the combustion reaction releases 890.4 kJ of heat? (Assuming all reactants and products are in their standard states)

asked Mar 1 in Physical Chemistry by TheScientist (138k points)

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How does the mechanism of action of drug A affect the pharmacokinetics of drug B in the presence of co-administration, and what are the potential adverse effects that may arise due to this drug-drug interaction in the treatment of a specific disease?

asked Mar 1 in Medicinal Chemistry by TheScientist (138k points)

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What is the percentage yield of a chemical reaction if 12 grams of product are obtained when 20 grams of reactant are used and the theoretical yield is 15 grams?

asked Mar 1 in Chemical reactions by TheScientist (138k points)

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What is the formal charge on the central sulfur atom in the sulfate ion (SO4^2-)?

asked Mar 1 in Inorganic Chemistry by TheScientist (138k points)

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What is the standard enthalpy change of combustion (ΔH°c) for propane (C3H8) gas at 298 K, given the balanced chemical equation: C3H8(g) + 5O2(g) -> 3CO2(g) + 4H2O(g)?

asked Mar 1 in Physical Chemistry by TheScientist (138k points)

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What is the theoretical yield of p-nitroaniline that can be obtained from the reaction of 5 grams of aniline with excess nitric acid, assuming complete conversion and 100% yield?

asked Mar 1 in Chemical synthesis by TheScientist (138k points)

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What is the standard enthalpy change for the vaporization of 10 g of water at a temperature of 100°C and atmospheric pressure?

asked Mar 1 in Chemical thermodynamics by TheScientist (138k points)

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What is the specific surface area of a sample of activated carbon with a BET value of 1000 m²/g, given that the mass of the sample used for the measurement is 0.5 g?

asked Mar 1 in Surface Chemistry by TheScientist (138k points)

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What is the theoretical yield of benzocaine that can be obtained from the reaction between p-aminobenzoic acid and ethanol, assuming a 100% yield and using the stoichiometry of the reaction?

asked Mar 1 in Chemical synthesis by TheScientist (138k points)

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What is the specific heat capacity of a substance that requires 2510 J of energy to increase the temperature of a 50 g sample by 10 °C?

asked Mar 1 in ThermoChemistry by TheScientist (138k points)

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What is the enthalpy change when 50 g of NaOH is dissolved in 500 mL of water at 25°C? Consider the density and specific heat capacity of water, and use the standard enthalpy of formation values for NaOH and H2O.

asked Mar 1 in ThermoChemistry by TheScientist (138k points)

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1 answer 106 views

How does the temperature affect the selectivity of a reaction involving the decomposition of hydrogen peroxide catalyzed by iodide ions?

asked Feb 28 in Chemical kinetics by TheScientist (138k points)

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