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What is the standard enthalpy change when 50.0 mL of 0.200 M HCl is mixed with 50.0 mL of 0.200 M NaOH to form NaCl(aq) and H2O(l) at 25°C? Given: The specific heat capacity of the solution is 4.18 J/(g°C) and the density of the solution is 1.00 g/mL.

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

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What is the enthalpy change for the following chemical reaction?2H2 (g) + O2 (g) → 2H2O (l)Given the enthalpy of formation values:ΔHf°(H2O) = -285.8 kJ/molΔHf°(H2) = 0 kJ/molΔHf°(O2) = 0 kJ/mol

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

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How can we design an efficient treatment system for the removal of toxic heavy metals from industrial wastewater, such as lead and mercury, using chemical precipitation methods?

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

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What is the equilibrium constant for the formation of a complex ion [Fe(SCN)6]3- when mixing 0.1 M Fe(NO3)3 and 0.1 M KSCN? The absorbance of the [Fe(SCN)6]3- ion at 450 nm is found to be 0.60. Calculate the concentration of [Fe(SCN)6]3-.

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

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What is the activation energy of the following chemical reaction: 2H2O2(aq) → 2H2O(l) + O2(g)? Use the experimental data provided to calculate the activation energy in Joules per mole.

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

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What is the heat of hydration for the reaction between magnesium sulfate heptahydrate (MgSO4•7H2O) and water (H2O) when 3.50 g of MgSO4•7H2O is dissolved in 50.0 mL of water at 25 °C? The molar heat of hydration for MgSO4•7H2O is –90.39 kJ/mol.

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

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What are the specific enzymes responsible for metabolizing a certain group of drugs used in treating hypertension, and how do variations in these enzymes affect the efficacy and potential adverse effects of the drugs?

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

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What is the heat of crystallization when 50 grams of water is frozen to form ice at a temperature of -10°C? (Assuming the heat capacity of water is 4.184 J/g°C and the heat of fusion of water is 6.01 kJ/mol)

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

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How does the use of different exchange-correlation functionals in density functional theory calculations affect the calculated reaction energies and mechanisms for the catalytic oxidation of methane on transition metal surfaces?

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

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What is the standard enthalpy change for the reaction when 50 ml of 0.2 M hydrochloric acid is mixed with 50 ml of 0.1 M sodium hydroxide solution at 25°C? The specific heat capacity of the mixed solution is 4.18 J/g°C and the density is 1 g/mL.

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

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What is the diffusion coefficient of oxygen gas in air at a temperature of 25°C and 1 atm pressure?

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

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What is the heat capacity of 25 grams of water if its temperature rises from 20°C to 50°C?

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

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What is the yield of p-nitroaniline obtained when 10 grams of aniline is reacted with a 10 mL of 70% nitric acid solution for 1 hour?

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

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What is the surface area of a sample of activated carbon that adsorbs 2.5 moles of nitrogen gas at 77 K and a pressure of 1 atm according to the BET theory? The sample weight is 3 grams and the molecular weight of nitrogen is 28 g/mol.

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

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What is the standard enthalpy change for the reaction between copper(II) sulfate pentahydrate and ammonia to form the deep blue complex ion Cu(NH3)4(H2O)2SO4? Show all the steps involved in calculating the standard enthalpy change.

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

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What is the pH of a solution with a concentration of 0.01 M hydrochloric acid?

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

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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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What are the factors that affect the stability of colloidal solutions and how can they be adjusted to prevent coagulation?

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

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What is the electronegativity difference between chlorine (Cl) and oxygen (O) in the compound sodium chloride (NaCl)?

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

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What is the heat required to raise the temperature of 50 grams of water by 10 degrees Celsius? The specific heat capacity of water is 4.18 J/g °C.

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

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