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What is the enthalpy change for the dissolution of 5 grams of solid NaOH in 100 mL of water, given that the final temperature of the solution is 25°C? The heat capacity of the solution is 4.18 J/g°C.

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

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What is the enthalpy change for the dissolution of 4.5 grams of NaOH in water, given that the molar enthalpy of dissolution is -44.5 kJ/mol?

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

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What is the mechanism behind thermal degradation of polyethylene and how can the stability of the polymer be improved?

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

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What is the entropy change for a monatomic ideal gas when the gas expands isothermally from volume V1 to volume V2 inside a container at temperature T?

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

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How does the temperature affect the orientational order of liquid crystals as predicted by Monte Carlo simulations?

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

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What are the main reasons for inadequate emphasis on chemical reactions and equations in current chemistry curriculums, and how can educators better incorporate these essential concepts into their teaching methods?

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

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How can the use of polymer-based optical materials enhance the performance of organic solar cells, and what are the specific properties that make these materials effective in this application?

asked Feb 28 in Polymer Chemistry 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 if the specific heat capacity of water is 4.184 J/g*C?

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

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What is the formal charge on the oxygen atom in the sulfate ion (SO4²⁻)? Show the calculation of the formal charge.

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

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What is the enthalpy change for the combustion of 1 mole of methane (CH4) at constant pressure if the standard enthalpy of formation of methane is -74.8 kJ/mol? Write a balanced equation for the combustion reaction and show your calculations.

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

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What is the standard enthalpy change for the fusion of 10 grams of solid sodium (Na) at its melting point, given that the molar heat of fusion of sodium is 2.60 kJ/mol?

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

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How does the use of nitrogen fertilizers in sustainable agriculture practices impact the environment and what are some ways to minimize this impact?

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

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How much heat is released when 20 grams of methane (CH4) undergoes complete combustion?

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

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What is the standard enthalpy change for the dissolution of 2.5 moles of sodium chloride in water at 25°C, given that the standard enthalpy of formation of NaCl is -411.1 kJ/mol, and the molar 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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What is the enthalpy change associated with the fusion of 45.0 g of ice at 0°C? Given the enthalpy of fusion for water is 6.01 kJ/mol.

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

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What is the standard enthalpy change for the combustion of methane (CH4) to produce carbon dioxide (CO2) and water (H2O) if the reactants and products are at standard conditions (298 K and 1 atm)?

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

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What is the enthalpy change for the combustion of 1 mole of propane (C3H8) given the enthalpies of formation of CO2, H2O, and C3H8? C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(g) ΔH° = ?

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

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What is the yield of aspirin obtained from the chemical synthesis of aspirin from salicylic acid and acetic anhydride, and how does it vary with different reaction conditions such as temperature and reaction time?

asked Feb 28 in Chemical synthesis by TheScientist (138k points)

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What is the enthalpy change involved in the isomerization reaction of hexene from trans-hexene to cis-hexene? Given the standard enthalpy of formation values for trans-hexene and cis-hexene are -123 kJ/mol and -130 kJ/mol respectively.

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

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What is the standard enthalpy change for the vaporization of 50.0 g of water at a temperature of 298.15 K and a pressure of 1 atm? 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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