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0
votes
1
answer
21
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What is the optimum reaction conditions to prepare 2,4,6-trinitrotoluene from toluene and nitric acid in terms of temperature, concentration, and reaction time to obtain a maximum yield of the product?
asked
3 days
ago
in
Chemical synthesis
0
votes
1
answer
23
views
What is the mechanism for the addition reaction between an alkene and hydrogen bromide (HBr) in the presence of peroxide (ROOR)?
asked
Feb 17
in
Organic Chemistry
0
votes
1
answer
10
views
How do persistent organic pollutants (POPs) accumulate in the food chain and what are the potential health and environmental impacts of their accumulation?
asked
Feb 14
in
Environmental Chemistry
0
votes
1
answer
30
views
How can quantum mechanics be applied to develop qubits for use in quantum computing, and what are the advantages and challenges of using qubits compared to classical binary digits?
asked
Feb 5
in
Quantum Chemistry
0
votes
1
answer
46
views
Design a heat exchanger that can transfer heat from a 10,000 L/h hot water stream at 80°C to a 5,000 L/h cold water stream at 20°C with a maximum temperature difference of 10°C. Calculate the required heat transfer area and select appropriate materials for the heat exchanger components based on the fluids' properties and operating conditions.
asked
Feb 4
in
Chemical engineering
0
votes
1
answer
41
views
Calculate the standard enthalpy change for the combustion of 1 mole of propane gas (C3H8) at standard conditions using the following balanced chemical equation: C3H8(g) + 5O2(g) -> 3CO2(g) + 4H2O(l)Given the standard enthalpy of formation values at 298K for C3H8(g), CO2(g), and H2O(l) as -103.8, -393.5, and -285.8 kJ/mol respectively, calculate the standard enthalpy change for the combustion reaction.
asked
Feb 3
in
Chemical thermodynamics
0
votes
1
answer
51
views
Calculate the pH of a 0.1 M solution of acetic acid (Ka = 1.8 x 10^-5).
asked
Feb 3
in
Chemical reactions
0
votes
1
answer
90
views
What is the effect of different functional groups on the surface properties of a graphene sheet using Density functional theory calculations?
asked
Jan 31
in
Computational Chemistry
0
votes
1
answer
60
views
Calculate the heat of mixing when 100 mL of 0.1 M HCl is mixed with 200 mL of 0.2 M NaOH at 25°C. The specific heat of the solution is 4.18 J/g°C and the density of the solution is 1.00 g/mL. Assume that the heat capacity of the solution is equal to that of pure water.
asked
Jan 23
in
ThermoChemistry
0
votes
1
answer
45
views
Calculate the Gibbs free energy change for the combustion of ethane gas in oxygen gas to form carbon dioxide gas and water vapor at a temperature of 25 °C and a pressure of 1 atm, given the following thermodynamic data:Reaction: C2H6(g) + 3.5O2(g) → 2CO2(g) + 3H2O(g)ΔH°rxn = -1560.8 kJ/molΔS°rxn = -283.3 J/K•molUsing the above information, what is the value of the Gibbs free energy change at standard conditions?
asked
Jan 23
in
Chemical thermodynamics
0
votes
1
answer
45
views
Calculate the enthalpy change for the complete oxidation of 12.5 g of methane gas assuming that all the heat evolved is used to heat up 150 g of water from 25°C to 35°C. The enthalpy of formation of CH4(g) and H2O(l) are -74.8 kJ/mol and -285.8 kJ/mol, respectively.
asked
Jan 23
in
ThermoChemistry
0
votes
1
answer
70
views
What is the identity of an unknown organic compound based on its IR spectrum, given peaks at 3400 cm-1 and 1700 cm-1?
asked
Jan 21
in
Organic Chemistry
0
votes
1
answer
54
views
What is the role of the prefrontal cortex in decision-making according to the somatic marker theory?
asked
Jan 20
in
Psychology
0
votes
1
answer
34
views
How does the humanistic theory differ from other schools of thought?
asked
Jan 20
in
Psychology
0
votes
1
answer
53
views
When was the first edition of the Diagnostic and Statistical Manual of Mental Disorders DSM published?
asked
Jan 20
in
Psychology
0
votes
1
answer
65
views
According to the social causation hypothesis, what contributes to the greater incidence of psychosis in urban areas?
asked
Jan 20
in
Psychology
0
votes
1
answer
75
views
According to Skinner's operant conditioning, how can we determine a behavior to repeat?
asked
Jan 20
in
Psychology
0
votes
1
answer
63
views
What did Pavlov's experiment with dogs demonstrate?
asked
Jan 20
in
Psychology
0
votes
1
answer
12
views
What are the implications of attachment theory for the development of personality disorders?
asked
Jan 17
in
Psychology
0
votes
1
answer
45
views
How can the psychological reactance theory be evaluated?
asked
Jan 16
in
Psychology
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