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What is the heat evolved when 25 grams of NaOH is dissolved in 500 mL of water at 25°C, given that the enthalpy of solution of NaOH is -44.5 kJ/mol?

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

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What is the standard enthalpy change for the reaction between 50 mL of 0.1 M HCl and 50 mL of 0.1 M NaOH at 25°C, given that the balanced equation is HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l) and the specific 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 standard enthalpy change for the reaction 2SO2(g) + O2(g) → 2SO3(g) at 25°C and 1 atm pressure, given the following enthalpy of formation values: ΔfH°[SO2(g)] = -296.8 kJ/mol, ΔfH°[O2(g)] = 0 kJ/mol, and ΔfH°[SO3(g)] = -395.72 kJ/mol?

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

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What is the heat capacity of 50 grams of water at a temperature of 25°C, given that the specific heat of water is 4.18 J/g•°C?

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

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What is the magnetic moment of a tetrahedral complex with four ligands, each containing one unpaired electron, coordinated to a central transition metal ion with a d⁴ electron configuration?

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

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What is the yield of 2,4-dinitrophenol obtained in the preparation of 2,4-dinitrophenol from phenol and nitric acid, given that 10 grams of phenol was used and a 95% yield was achieved?

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

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What is the Gibbs free energy change for the formation of 2 moles of water molecules from hydrogen gas and oxygen gas at standard conditions (298 K and 1 atm pressure)? Give the answer in kJ/mol.

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

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What is the lattice energy of magnesium oxide (MgO) given that the ionization energy of Mg is 738 kJ/mol, the electron affinity of O is -141 kJ/mol, and the distance between the ions in MgO is 2.1 Å? Show your work and units.

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

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What is the standard free energy change (ΔG°) for the following redox reaction at 298 K?2Fe2+ (aq) + Cl2 (g) → 2Fe3+ (aq) + 2Cl- (aq)Given data:E°(Fe3+|Fe2+) = +0.77 V; E°(Cl2|Cl-) = +1.36 V

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

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What are the reasons behind the difficulty in understanding the periodic table and the concept of chemical elements, and how can advanced mnemonic techniques be used to aid in memorizing the periodic table?

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

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If 2.50 moles of propane react with excess oxygen gas, how much heat is released at constant pressure if the enthalpy change of the reaction is -2044 kJ/mol?

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

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What is the heat of sublimation of iodine, given that it has a vapor pressure of 10 mmHg at -10°C and a normal boiling point of 184.35°C?

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

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What is the heat of sublimation of carbon dioxide (CO2) if 50 g solid CO2 is completely converted into gas phase without changing the temperature and pressure conditions? Given: The molar heat of sublimation of CO2 is 25.2 kJ/mol.

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

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1 answer 75 views

How can we decrease the energy loss caused by the recombination of charged carriers in polymer-based photovoltaic materials, thereby improving their efficiency as solar cells?

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

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What is the heat of neutralization when 50 mL of 2.0 M hydrochloric acid reacts with 50 mL of 2.0 M sodium hydroxide solution? The specific heat capacity of the solution is 4.18 J/g °C, and the temperature change is recorded as 8.2 °C during the reaction.

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

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1 answer 78 views

What is the specific surface area (in m²/g) of a sample of activated carbon that adsorbs 20 ml of nitrogen gas at STP, assuming monolayer formation and a nitrogen cross-sectional area of 0.162 nm²? The mass of the activated carbon sample is 0.5 g.

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

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What is the enthalpy change when 50 g of NaOH is dissolved in 500 mL of water at 25°C? Consider the density and specific heat capacity of water, and use the standard enthalpy of formation values for NaOH and H2O.

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

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What is the change in enthalpy for the following reaction at room temperature: 2H2(g) + O2(g) -> 2H2O(l) given the bond dissociation energies: H-H: 436 kJ/mol O=O: 498 kJ/mol H-O: 463 kJ/mol

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

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1 answer 79 views

What is the molar mass of Ba(NO3)2?

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

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What is the rate of electroplating in a cell with a current of 2.5 A passing through it for 1 hour if the mass of the metal deposited on the cathode is 0.456 g? (assume a 100% yield and use the appropriate formula to calculate the rate).

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

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