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Sure, here's a precise question:Calculate the amount of heat required to vaporize 50 g of water at its boiling point (100°C) if its enthalpy of vaporization is 40.7 kJ/mol?

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

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What is the standard enthalpy change for the dissolution of 5.00g of sodium chloride (NaCl) in 100mL of water (H2O) at 25°C? The molar mass of NaCl is 58.44 g/mol and the density of water at this temperature is 0.997 g/mL.

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

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What is the pH of a 0.1 M HCl solution?

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

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What is the enthalpy change for dissolving 10 grams of sodium chloride (NaCl) in 200 mL of water at 25°C if the final temperature of the solution is 30°C? Given: the enthalpy of solution for NaCl is -3.9 kJ/mol.

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

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What is the percent yield of silver chloride when 24.5 g of silver nitrate solution reacts with excess sodium chloride to form 23.1 g of silver chloride? The balanced chemical equation is: AgNO3 + NaCl → AgCl + NaNO3.

asked Mar 1 in Chemical reactions 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 standard enthalpy change for the vaporization of 50 grams of water at 100°C and 1 atm pressure? Given the molar enthalpy of vaporization of water is 40.7 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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What is the effect of adding a buffer to a solution containing acetic acid and sodium acetate on the equilibrium position of the acid-base reaction between acetic acid and acetate ions? Provide numerical calculations to support your answer.

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

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What is the standard enthalpy change for the vaporization of 25 grams of water at 100°C and 1 atm pressure? Given the standard enthalpy of vaporization for water is 40.7 kJ/mol.

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

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What is the monolayer capacity of a sample of activated alumina with a surface area of 200 m2/g, using the BET theory of multilayer adsorption and assuming a specific surface area of 16.2 × 10-20 m2 for nitrogen at 77 K?

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

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What is the formal charge of the nitrogen atom in the molecule HCN? Show your calculations.

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

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What is the heat of hydration for the reaction between 50 grams of anhydrous copper(II) sulfate and excess water, given that the final solution mass is 250 grams and the temperature change observed during the reaction is -30 °C?

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

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How can we control the rate of phosphorescence decay in a particular phosphorescent material under different temperature and light intensity conditions?

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

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What is the heat of hydration of magnesium sulfate (MgSO4) when 50 grams of the salt is dissolved in 500 ml of water at 25°C, given that the specific heat of the solution is 4.18 J/g°C and the enthalpy change of solution is -1048 kJ/mol?

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

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What is the change in enthalpy (ΔH) for the combustion of 10 grams of methane (CH4) at standard conditions, given the following balanced equation: CH4 + 2O2 → CO2 + 2H2O?

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

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What is the theoretical yield of acetylsalicylic acid that can be obtained from the reaction of 5 grams of salicylic acid and 10 mL of acetic anhydride, assuming complete reaction and 100% yield?

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

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What is the activation energy for the electrochemical reaction occurring between zinc and copper ions, given that the reaction has a rate constant of 1.5 x 10^-4 mol L^-1 s^-1 at 25°C and a rate constant of 6.2 x 10^-3 mol L^-1 s^-1 at 40°C?

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

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What is the maximum amount of work that can be obtained from a reversible isothermal expansion of a gas at 25°C when the initial pressure is 4.00 atm and the final pressure is 1.00 atm and the initial volume of the gas is 3.00 L?

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

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What is the maximum achievable monolayer coverage of a gas on a solid surface at a temperature of 25°C and a pressure of 1 atmosphere, given that the Langmuir constant is 0.05 L/mol?

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

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