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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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What is the bond enthalpy of the carbon-carbon bond in a molecule of ethane? Given that the enthalpy change for the reaction C2H6(g) → 2CH3(g) is +84.7 kJ/mol, calculate the bond enthalpy for the C-C bond in ethane.

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

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What is the standard enthalpy change for the precipitation reaction between aqueous solutions of silver nitrate (AgNO3) and sodium chloride (NaCl) to form solid silver chloride (AgCl) and aqueous sodium nitrate (NaNO3)?

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

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Identify the major intermediate(s) and propose a mechanism for the following reaction: CH3CH2OH + HBr → CH3CH2Br + H2O

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

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What is the pH of a solution with a concentration of 0.005 M hydrochloric acid (HCl)?

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

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How can the use of Ab initio calculations improve our understanding of excited state dynamics in chemical reactions?

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

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What is the lattice energy of CaF2 in kilojoules per mole given that the distance between the calcium ion and fluoride ion is 2.01 Å and the charges on the ions are +2 and -1 respectively?

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

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Sure! Here's a precise problem for the student:The combustion of 2.50 grams of methane (CH4) gave off 119.1 kJ of heat. Calculate the enthalpy change for the combustion of one mole of methane at constant pressure.

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

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What are the factors that affect the selectivity of a chemical reaction and how can quantum chemistry be used to predict and enhance selectivity in organic synthesis?

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

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What are the necessary steps and reagents needed for the synthesis of polypropylene from propylene monomer, and what are the optimal reaction conditions for achieving a high yield and desired molecular weight of the polymer?

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

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How does the synthesis method affect the characteristics and performance of new materials used in fuel cells?

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

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What is the corrosion potential of a zinc electrode immersed in a solution of 0.1 M ZnSO4, which is coupled with a copper electrode in a 0.1 M CuSO4 solution at 25°C? Given that the standard reduction potential for Zn2+ is -0.76 V and for Cu2+ is +0.34 V.

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

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What is the standard entropy change of the combustion reaction of methane gas under standard conditions?

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

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What is the pH of a 0.1 M solution of acetic acid (CH3COOH) at 25°C?

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

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What is the enthalpy of vaporization of water at 100°C? Given that the vapor pressure of water at 100°C is 1 atm and the molar heat capacity at constant pressure of water is 75.3 J/mol*K. Also, assume that water behaves as an ideal gas.

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

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What is the mechanism of action for a specific class of drugs and how does it affect the interactions of enzymes and receptors within the body?

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

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What are the different polymer characterization techniques used to determine the molecular weight distribution of polymers, and how do these techniques differ in their accuracy and precision?

asked Mar 1 in Polymer Chemistry 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 enthalpy of precipitation for the reaction between 0.1 M NaOH and 0.1 M CaCl2 at 25°C? Given that the enthalpy of formation for NaCl and Ca(OH)2 are -407.14 kJ/mol and -986.09 kJ/mol, respectively.

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

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What will be the effect on the equilibrium position of the redox reaction between Fe2+ and MnO4- if the concentration of Fe2+ is tripled, keeping the concentration of MnO4- constant?

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

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