Recent activity by JulioDarrow7

1 answer 26 views

Calculate the standard enthalpy of hydrolysis for the following reaction: AlCl3 + 3H2O → Al(OH)3 + 3HCl Given that the standard enthalpies of formation for AlCl3(-696.5 kJ/mol), Al(OH)3(-1277.1 kJ/mol), and HCl(-92.3 kJ/mol) are known.

asked 2 days ago in ThermoChemistry

1 answer 22 views

Calculate the standard enthalpy change for the neutralization reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH) in aqueous solutions. The balanced chemical equation for the reaction is as follows:HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l) Given the enthalpy of formation for HCl(aq) is -167.2 kJ/mol, NaOH(aq) is -469.14 kJ/mol, NaCl(aq) is -407.3 kJ/mol, and H2O(l) is -285.83 kJ/mol. The reaction is carried out at standard temperature and pressure.

answered 2 days ago in Chemical thermodynamics

1 answer 49 views

A student needs to determine the diffusion coefficient of a gas in a liquid by measuring the rate of diffusion using a diffusion cell. If the student knows the initial concentration and final concentration of the gas in the cell, and the time it took for diffusion to occur, what is the diffusion coefficient of the gas in the liquid?

answered Jan 22 in Physical Chemistry

1 answer 87 views

A chemistry student needs to calculate the standard enthalpy change for the combustion reaction of methane (CH4) to produce carbon dioxide (CO2) and water (H2O) at 298 K. The student is given the following information: CH4(g) + 2O2(g) → CO2(g) + 2H2O(l) ΔH°rxn = -890.4 kJ/molThe enthalpy of formation of CH4(g) and H2O(l) are -74.8 kJ/mol and -285.8 kJ/mol, respectively. Using this data, what is the standard enthalpy change for the combustion reaction of methane (CH4) to produce carbon dioxide (CO2) and water (H2O) at 298 K?

answered Jan 22 in Chemical thermodynamics

1 answer 76 views

A chemistry student is given the following thermochemical equations: Equation 1: H2 (g) + 1/2O2 (g) → H2O(l) ΔH1 = -285.8 kJ/mol Equation 2: C(s) + O2 (g) → CO2 (g) ΔH2 = -393.5 kJ/mol Equation 3: 2H2 (g) + O2 (g) → 2H2O(l) ΔH3 = -571.6 kJ/mol Using Hess's Law, calculate the enthalpy change for the following reaction: C(s) + 2H2 (g) → CH4 (g)

answered Jan 22 in ThermoChemistry

1 answer 60 views

A chemical engineer wants to separate a mixture of ethanol and methanol using a distillation column. The feed to the column contains 30% ethanol and 70% methanol by mole. The engineer wants to obtain a distillate with 80% ethanol and a bottoms product containing no more than 1% ethanol. Determine the number of trays required in the distillation column to achieve this separation. Consider only equilibrium stages and assume that the feed is saturated liquid at its boiling point. The operating pressure of the column is 1 atm.

asked Jan 22 in Chemical engineering

1 answer 6 views

When can stereotypes be useful?

answered Jan 20 in Psychology

1 answer 21 views

How is the cocktail party effect possible?

answered Jan 16 in Psychology

1 answer 17 views

How can cognitive dissonance theory be evaluated?

asked Jan 16 in Psychology

1 answer 3 views

When evaluating cognitive theories, why is it important to use a variety of research methods?

answered Jan 16 in Psychology

1 answer 22 views

What is the difference between a directive and supportive leadership style?

answered Jan 16 in Psychology

1 answer 4 views

When evaluating the validity of a cognitive behavioural theory, what is meant by construct validity?

answered Jan 15 in Psychology

1 answer 27 views

Who was the founder of observational psychology?

answered Jan 15 in Psychology

1 answer 6 views

What is the significance of identity diffusion in adolescent development?

asked Jan 14 in Psychology

1 answer 25 views

What is sleep inertia?

answered Jan 14 in Psychology

1 answer 22 views

What is grief work?

answered Jan 14 in Psychology

1 answer 35 views

What is the difference between the naturalistic observation and controlled observation research methods?

answered Jan 10 in Psychology

1 answer 30 views

Naphthalens is a chemical which is commonly used in what?

asked Dec 31, 2024 in Science

1 answer 23 views

In what energy industry process are fluids pumped through a borehole, creating fractures in the rock that contains the natural gas?

asked Dec 31, 2024 in Science

1 answer 41 views

In eukaryotes, mrna may be modified before leaving what?

asked Dec 31, 2024 in Science

Categories