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In the production process of lubricants, how can the chemical engineer choose the most appropriate base oil and additives to achieve the desired viscosity and performance requirements while maintaining cost-effectiveness?

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

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What is the exchange current density for the oxidation of iron in a 0.1 M Fe2+(aq) solution at 25°C, assuming the standard electrode potential for the Fe2+/Fe3+ couple is +0.77 V? The rate constant for the reaction is 1.2x10^-5 cm/s.

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

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What is the power output of an electrochemical cell with a standard potential of +0.34 V and a current of 2.5 A flowing through it for 3 hours?

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

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What is the yield of acetylsalicylic acid obtained if 5 grams of salicylic acid and 10 grams of acetic anhydride are used in the preparation of acetylsalicylic acid through the reaction of esterification, assuming complete conversion?

asked Mar 1 in Chemical synthesis 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 fundamental vibrational frequency and corresponding infrared spectrum of the water molecule (H2O) in its ground state?

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

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What is the heat required to raise the temperature of 50 grams of water from 20°C to 50°C, given that the heat capacity of water is 4.184 J/g°C?

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

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1 answer 101 views

How can we design a cost-effective and efficient system for the production of a specific cosmetic while taking into consideration the safety of the product and its impact on the environment?

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

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The decomposition of hydrogen peroxide in aqueous solution is a first-order reaction with a rate constant of 4.6 x 10^-4 s^-1 at 25°C. Calculate the time required for 75% of a 0.010 M solution of hydrogen peroxide to decompose at 25°C.

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

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Sure, here's a problem:Calculate the standard enthalpy change for the combustion of methane gas (CH4) using the following information:Formation of CO2: -393.5 kJ/molFormation of H2O: -285.8 kJ/molFormation of CH4: -74.8 kJ/mol

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

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1 answer 112 views

What is the effect of adding a buffer to a solution containing acetic acid and sodium acetate on the equilibrium position of the acid-base reaction between acetic acid and acetate ions? Provide numerical calculations to support your answer.

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

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What is the standard enthalpy change for the vaporization of 50 grams of water at 100°C and 1 atm pressure? Given the molar enthalpy of vaporization of water is 40.7 kJ/mol.

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 heat of hydration for MgSO4·7H2O, given that its enthalpy change per mole of hydration is -192 kJ/mol and 10 grams of MgSO4·7H2O is dissolved in 100 grams of water at 25°C?

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

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1 answer 104 views

What is the rate of reaction when 2 mol of hydrogen gas (H2) react with 1 mol of oxygen gas (O2) to form 2 mol of water (H2O) in 10 minutes at a constant temperature and pressure of 1 atm?

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

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What is the formal charge of sulfur in the sulfate ion (SO4)^(2-) ? Show your calculations.

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

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What is the rate of diffusion of oxygen through a 2 cm thick slab of air at 25°C and 1 atm pressure? The diffusivity of oxygen is 0.20 cm^2/s.

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

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1 answer 103 views

What is the standard enthalpy change for the reaction between 50 mL of 0.1 M HCl and 50 mL of 0.1 M NaOH at 25°C, given that the balanced equation is HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l) and the specific heat capacity of the solution is 4.18 J/g K?

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

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1 answer 113 views

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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1 answer 114 views

What factors affect the effectiveness of sunscreen agents in protecting the skin from UV radiation?

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

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