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What is the surface area of a sample of activated carbon that adsorbs 2.5 moles of nitrogen gas at 77 K and a pressure of 1 atm according to the BET theory? The sample weight is 3 grams and the molecular weight of nitrogen is 28 g/mol.

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

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What is the lattice energy of NaCl(s) at 25°C given that the enthalpy of formation of NaCl(s) is -411.2 kJ/mol, the enthalpy of sublimation of Na(s) is 107.29 kJ/mol, and the first ionization energy of Na(g) is 495.8 kJ/mol?

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

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How can the synthesis of zeolites be optimized to achieve higher yields and better product quality?

asked Feb 28 in Materials Chemistry 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 pH of a 0.1 M solution of hydrochloric acid (HCl) measured using a pH meter at 25°C?

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

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What is the yield of 2,4-dichlorobenzoic acid that can be obtained from the reaction between 100 grams of benzoic acid and 50 grams of chlorine gas, assuming an 80% yield for the reaction?

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

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What is the pH of a 0.1 M solution of hydrochloric acid (HCl) at 25°C using a pH meter?

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

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What is the entropy change (∆S) for the reaction: 2H2(g) + O2(g) → 2H2O(l) given the standard entropy values ∆S°(H2(g)) = 130.6 J/K·mol ∆S°(O2(g)) = 205.0 J/K·mol ∆S°(H2O(l)) = -69.9 J/K·mol

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

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What are the main reasons for the difficulty in integrating technology into chemistry education, and what strategies can chemistry educators use to overcome these obstacles and effectively incorporate technology into their teaching methodologies?

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

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What is the enthalpy of vaporization of water if 50.0 g of water at 100°C is converted to steam at 100°C? The heat capacity of water is 4.184 J/g°C and the molar heat of vaporization of water is 40.7 kJ/mol.

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

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What is the vibrational frequency of HCl molecule in its ground state?

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

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What is the pH of a 0.1 M solution of acetic acid?

asked Mar 1 in Chemical bonding 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 formal charge on the nitrogen atom in the ammonium ion, NH4+?

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

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The decomposition of hydrogen peroxide in aqueous solution is a first-order reaction with a rate constant of 4.6 x 10^-4 s^-1 at 25°C. Calculate the time required for 75% of a 0.010 M solution of hydrogen peroxide to decompose at 25°C.

asked Mar 1 in Chemical kinetics 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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What is the enthalpy change for the following chemical reaction?2H2 (g) + O2 (g) → 2H2O (l)Given the enthalpy of formation values:ΔHf°(H2O) = -285.8 kJ/molΔHf°(H2) = 0 kJ/molΔHf°(O2) = 0 kJ/mol

asked Mar 1 in Chemical thermodynamics 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 standard enthalpy change for the vaporization of 50g of water at its boiling point (100°C) and 1 atm (pressure of the atmosphere)? Given that the standard enthalpy of vaporization of water is 40.79 kJ/mol.

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

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What is the percent yield of magnesium oxide when 10.0 grams of magnesium is reacted with excess oxygen and 12.5 grams of magnesium oxide is produced? The theoretical yield of the reaction is 16.2 grams.

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

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