Hot questions

0 votes

1 answer 75 views

What is the rate of the reaction if 2 moles of substance A react with 1 mole of substance B in 10 seconds, assuming it follows first-order kinetics with a rate constant of 0.5 s^-1?

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

0 votes

1 answer 78 views

What is the formal charge of sulfur (S) in SO4^(2-)?

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

0 votes

1 answer 79 views

What is the enthalpy change of dissolving 5 grams of sodium hydroxide (NaOH) in 100 mL of water? The molar enthalpy of dissolution of NaOH is -44.51 kJ/mol.

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

0 votes

1 answer 90 views

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)

0 votes

1 answer 74 views

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)

0 votes

1 answer 85 views

What are the factors that contribute to the difficulty in understanding the periodic table and chemical elements and how can they be addressed to improve students' comprehension?

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

0 votes

1 answer 74 views

What is the standard enthalpy change for the reaction between 50.0 mL of 0.100 M HCl(aq) and 50.0 mL of 0.100 M NaOH(aq) at 25 °C, given that the temperature change of the mixture was 10.0 °C and the specific heat capacity of the solution is 4.18 J/(g·K)?

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

0 votes

1 answer 75 views

What is the rate of diffusion of nitrogen gas in air at 25°C and 1 atm pressure, if the molecular weight of nitrogen is 28 g/mol and the average velocity of the gas molecules is 500 m/s?

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

0 votes

1 answer 76 views

What is the maximum amount of work that can be obtained from a reversible isothermal expansion of a gas at 25°C when the initial pressure is 4.00 atm and the final pressure is 1.00 atm and the initial volume of the gas is 3.00 L?

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

0 votes

1 answer 80 views

What is the diffusion coefficient of a solute with a molecular weight of 100 g/mol in water at 25°C, when the solute concentration is 0.01 M and the diffusion rate is 1.5 × 10^-5 cm^2/s?

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

0 votes

1 answer 76 views

What is the maximum achievable monolayer coverage of a gas on a solid surface at a temperature of 25°C and a pressure of 1 atmosphere, given that the Langmuir constant is 0.05 L/mol?

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

0 votes

1 answer 78 views

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)

0 votes

1 answer 81 views

Using molecular orbital theory, calculate the bond order of CO molecule and determine if it is paramagnetic or diamagnetic.

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

0 votes

1 answer 72 views

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)

0 votes

1 answer 73 views

What is the surface area of a powdered sample of activated carbon if the amount of nitrogen gas adsorbed at -196°C is 25.6 mL/g and the cross-sectional area of nitrogen molecule is 16.2 Å²?

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

0 votes

1 answer 77 views

What is the Gibbs free energy change for the electrochemical reaction:Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s)given that the standard reduction potentials are E°(Cu2+|Cu) = +0.34 V and E°(Zn2+|Zn) = -0.76 V, and the reaction is carried out at 25°C?

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

0 votes

1 answer 74 views

What is the standard enthalpy change for the reaction of gaseous hydrogen and gaseous iodine to form hydrogen iodide at standard temperature and pressure? Show all steps of calculation using Hess's Law and relevant thermochemical equations.

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

0 votes

1 answer 75 views

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)

0 votes

1 answer 74 views

What is the standard enthalpy change for the phase transition reaction of ice to water at 1 atm and 25°C? Given the enthalpies of fusion and vaporization of water as 6.01 kJ/mol and 40.67 kJ/mol, respectively.

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

0 votes

1 answer 85 views

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)

Categories