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What is the standard enthalpy change for the reaction N2(g) + 3H2(g) → 2NH3(g) given the following standard enthalpies of formation: ΔHf°(N2)=0 kJ/mol, ΔHf°(H2)=0 kJ/mol, ΔHf°(NH3)=-46.2 kJ/mol? Make sure to show your calculations and units.

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

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What are the common misconceptions or difficulties that students face when learning the periodic table and chemical elements, and how can these be addressed effectively in order to enhance understanding and retention of the subject matter?

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

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How does the use of synthetic fertilizers in sustainable agriculture impact the quality of soil and water resources in the surrounding environment?

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

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What is the balanced redox equation for the reaction between potassium dichromate (K2Cr2O7) and ethanol (C2H5OH) in acidic medium? Calculate the oxidation number of chromium in the dichromate ion before and after the reaction.

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

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How does the type and concentration of photosensitizer affect the rate of the photochemical reaction under different light sources and light intensities?

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

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What is the Gibbs free energy change at 25°C for the reaction: 2NO(g) + O2(g) → 2NO2(g) given that the standard Gibbs free energy of formation of NO, O2, and NO2 are +90.4 kJ/mol, 0 kJ/mol and +51.3 kJ/mol, respectively?

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

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What is the pH of a solution with a hydrogen ion concentration of 3.5 x 10^-5 M, as measured using a pH meter?

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

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What is the enthalpy change for the hydrolysis reaction of sucrose (C12H22O11) in water, given that the molar heat of combustion for sucrose is -5632 kJ/mol and the standard enthalpy of formation for liquid water is -285.83 kJ/mol?

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

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What is the bond energy required to break the bond between two nitrogen atoms (N2) if the bond length is 109.76 pm?

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

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What is the enthalpy change for the hydrolysis of 10 grams of sucrose (C12H22O11) in an aqueous solution, assuming complete reaction and a standard state, given that the enthalpy of hydrolysis of sucrose is -564.9 kJ/mol?

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

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What is the VSEPR geometry of a molecule of carbon dioxide (CO2)?

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

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What are the steps to balance the following chemical equation: Fe + HCl -> FeCl3 + H2 ?

asked Mar 1 in Chemical education 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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How can we assess the potential environmental impacts of a proposed chemical manufacturing plant on the surrounding air and water quality, and what measures can be taken to mitigate them?

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

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What are the metabolic changes that occur in a cell when exposed to a specific drug, and what is the mechanism that causes these changes?

asked Mar 1 in BioChemistry 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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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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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 enthalpy change for the combustion of methane gas in a bomb calorimeter?

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

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What is the formal charge on the sulfur atom in SO4^(2-)?

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

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