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What is the amount of heat required to melt 25 g of ice at 0°C? The enthalpy of fusion of ice is 333 J/g.

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

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How does the temperature affect the nematic ordering of a liquid crystal sample simulated through Monte Carlo simulations?

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

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What is the pH of a 0.05 M solution of hydrochloric acid (HCl)?

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

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What is the enthalpy of dissolution of 10 grams of sodium chloride in 100 mL of water at 25°C, given that the final solution has a concentration of 1 M? (Assume that the specific 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 heat of neutralization for the reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH) when 50 mL of 2 M HCl is mixed with 50 mL of 2 M NaOH in a calorimeter and the temperature increases from 25°C to 31°C?

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

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What is the formal charge of the nitrogen atom in the nitrate ion (NO3-)? Show your calculation and explain whether the nitrate ion is a stable or unstable species based on formal charge.

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

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What is the change in equilibrium constant for the formation of a complex ion when the temperature is increased from 25°C to 50°C, given that the enthalpy of reaction is -20 kJ/mol and the entropy change is 80 J/(mol·K)?

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

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How does the wavelength of light affect the photochemical properties of photosensitive materials used in photography?

asked Feb 28 in PhotoChemistry by TheScientist (138k points)

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What is the specific surface area of a sample of activated carbon with a BET value of 1000 m²/g, given that the mass of the sample used for the measurement is 0.5 g?

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

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How does the wavelength of light affect the efficiency of photosensitizers in photochemical reactions?

asked Feb 28 in PhotoChemistry by TheScientist (138k points)

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How can the use of renewable energy sources such as solar, wind, and hydroelectric power be improved to minimize their impact on the environment and ensure their sustainability for future generations?

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

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What is the reaction quotient (Q) for the following reaction at 298K, if the partial pressures of reactants and products are as follows:2NO2(g) ⇌ 2NO(g) + O2(g)[NO2] = 0.5 atm, [NO] = 0.3 atm, and [O2] = 0.7 atm.

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

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What is the maximum yield of p-nitroaniline that can be obtained when 50g of aniline is reacted with an excess of nitric acid to form p-nitroaniline, assuming that the reaction goes to completion and all other reaction conditions remain constant?

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

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What is the formal charge of each atom in the CH3COOH molecule? Show your calculation and explain the significance of the formal charges in this molecule.

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

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What surface modification techniques can be used to enhance the catalytic activity of nanoparticles for specific chemical reactions?

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

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Using molecular orbital theory, calculate the bond order of the carbon monoxide molecule (CO). Show your work and explain how the bond order relates to the stability of the molecule.

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

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Using molecular orbital theory, calculate the bond order of the molecule N2+.

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

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What is the standard enthalpy change for the reaction N2(g) + 3H2(g) → 2NH3(g) at 298 K, given that the standard enthalpy of formation of NH3(g) is -46.1 kJ mol-1?

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

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Identify the major product formed from the following organic reaction: CH3CH2CH2-Br + KOH → Explain the mechanism of the reaction and predict the product based on the principles of rearrangement reactions in organic chemistry.

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

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1 answer 116 views

What is the theoretical basis for predicting the chemical reactivity and selectivity of a given molecule using quantum chemical calculations?

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

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