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What is the minimum amount of energy required to break H2O molecules in a system consisting of 100 water molecules at a temperature of 298 K? Use statistical mechanics and thermodynamic ensembles to solve the problem.

asked Mar 1 in Physical Chemistry 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 yield of 2,4-dinitrophenol obtained from the reaction of phenol and nitric acid when starting with 10 grams of phenol and 15 mL of 65% nitric acid under specific reaction conditions?

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

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What is the pH of a solution with 0.1 M HNO3 (nitric acid)?

asked Mar 1 in Inorganic Chemistry 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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How does the change in solvent polarity affect the reaction rate in the photochemical reaction of (insert specific compound here)?

asked Mar 1 in PhotoChemistry 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 heat required to sublime 30 grams of dry ice (CO2) at a constant pressure of 1 atm? The heat of sublimation of CO2 is 25.2 kJ/mol.

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

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What is the standard enthalpy of formation of methane (CH4) given the following bond dissociation energies (in kJ/mol): C-H = 413, C-C = 348, C=C = 614, C≡C = 837, H-H = 436?

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

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What is the standard enthalpy change of the dissolution of 10 grams of sodium chloride in 250 milliliters of water at 25°C, given that the molar enthalpy of dissolution of sodium chloride is -3.9 kilojoules per mole?

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

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What is the formal charge on the nitrogen atom (N) in the ammonium ion (NH4+)? Show your calculation steps.

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

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What is the heat of sublimation of dry ice (CO2) when 60 grams of it is sublimated at a constant pressure of 1 atm? The initial temperature of dry ice is -78.5°C and its final temperature is -56.6°C.

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

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What is the percent yield of p-nitroaniline obtained when 10g of aniline is reacted with excess nitric acid to produce p-nitroaniline and 8g of the product is obtained after purification?

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

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What is the formal charge of the nitrogen atom in the nitrate ion (NO3-)? Show your calculation and explain whether the nitrate ion is a stable or unstable species based on formal charge.

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

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What is the enthalpy change of dissolving 5 grams of sodium hydroxide (NaOH) in 100 mL of water at 25°C? Given the molar enthalpy of dissolution for NaOH is -44.5 kJ/mol.

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

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What is the theoretical yield of p-nitroaniline when 5 grams of aniline is reacted with 10 grams of nitric acid in the preparation of p-nitroaniline?

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

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What is the standard enthalpy change for the reaction between copper sulfate pentahydrate and potassium hydroxide to form copper hydroxide and potassium sulfate, assuming all substances are in their standard state and the reaction occurs at 25°C?

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

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What is the standard enthalpy change for the reaction where 2 moles of hydrochloric acid react with 1 mole of magnesium hydroxide in aqueous solutions to produce 1 mole of magnesium chloride and 2 moles of water at 298 K and 1 atm pressure?

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

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What is the reaction quotient (Q) for the following reaction at 298K, if the partial pressures of reactants and products are as follows:2NO2(g) ⇌ 2NO(g) + O2(g)[NO2] = 0.5 atm, [NO] = 0.3 atm, and [O2] = 0.7 atm.

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

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How can we design a practical experiment to demonstrate the real-life applications of acid-base titration in chemical industries?

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

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