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How does the wavelength of light affect the rate of a photochemical reaction in a particular sample? Is it possible to increase the rate of the reaction by optimizing the wavelength of light used? If so, how?

asked Feb 28 in Physical Chemistry by TheScientist (138k points)

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What is the reaction quotient for the equilibrium system at 298K if the concentrations of reactants and products are [NO]= 0.85 M, [O2]= 0.12 M, and [NO2]= 0.17 M, respectively for the reaction: 2 NO (g) + O2 (g) ⇌ 2 NO2 (g)?

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

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What is the heat of formation (in kJ/mol) of methane (CH4) from its elements carbon (C) and hydrogen (H2) at standard conditions (25°C and 1 atm)? Use the following data for the bond energies: C-H = 414 kJ/mol, H-H = 436 kJ/mol, and C-C = 348 kJ/mol.

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

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What is the expected yield of benzocaine if 5 grams of p-aminobenzoic acid and 10 mL of ethanol are used in the preparation of benzocaine?

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

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What is the activation energy for the electrochemical reaction occurring between zinc and copper ions, given that the reaction has a rate constant of 1.5 x 10^-4 mol L^-1 s^-1 at 25°C and a rate constant of 6.2 x 10^-3 mol L^-1 s^-1 at 40°C?

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

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What is the heat evolved or absorbed when 50.0 mL of 0.100 M nitric acid (HNO3) is neutralized with 50.0 mL of 0.100 M potassium hydroxide (KOH)? Given that the standard heat of neutralization for the reaction between HNO3 and KOH is -57.1 kJ/mol.

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

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What are the main factors that contribute to the difficulty in understanding complex chemical concepts, and how can a chemistry student overcome those challenges in order to improve their understanding and performance in the subject?

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

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What is the rate of diffusion of carbon dioxide (CO2) gas in air at a temperature of 25°C and a pressure of 1 atm if the molar mass of CO2 is 44 g/mol?

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

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How can we reduce the carbon footprint of a chemical manufacturing process, while still maintaining the efficiency and profitability of the process?

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

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What is the Gibbs free energy change of a spontaneous electrochemical reaction where zinc metal electrode is used as an anode and copper metal electrode is used as a cathode, with a cell potential of 1.10 V?

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

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What is the surface area of a sample of activated carbon if it adsorbed 2.5 moles of nitrogen gas at 77 K and 1 atm pressure? The cross-sectional area of nitrogen gas is known to be 16.2 square angstroms.

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

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What is the Gibbs free energy change for the reaction where 2 moles of hydrogen gas (H2) react with 1 mole of oxygen gas (O2) to form 2 moles of water vapor (H2O) at standard conditions (298 K and 1 atm pressure)?

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

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What is the equilibrium constant expression for the following reaction? 2 NO(g) + O2(g) ⇌ 2 NO2(g) Given that the initial concentrations of NO, O2, and NO2 were 0.025 M, 0.015 M, and 0 M, respectively, calculate the equilibrium constant (Kc) at 25°C.

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

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1 answer 76 views

Using spectroscopic data, calculate the equilibrium constant (K) for the formation of the complex ion Cu(NH3)42+ in a solution containing 0.02 M Cu2+ and 0.5 M NH3 at room temperature.

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

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How can the synthesis of zeolites be optimized to achieve higher yields and better product quality?

asked Feb 28 in Materials Chemistry 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 entropy change when 2 moles of water vapor (H2O(g)) condense to liquid water (H2O(l)) at 100°C and 1 atm pressure?

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

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What is the yield of 2,4-dichlorobenzoic acid that can be obtained from the reaction between 100 grams of benzoic acid and 50 grams of chlorine gas, assuming an 80% yield for the reaction?

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

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What is the standard enthalpy change for the neutralization reaction of 50 mL of 2M hydrochloric acid and 50 mL of 2M sodium hydroxide at 25°C?

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

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1 answer 73 views

What is the pH of a 0.1 M solution of hydrochloric acid (HCl) at 25°C using a pH meter?

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

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