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What is the specific heat capacity of a substance that requires 2510 J of energy to increase the temperature of a 50 g sample by 10 °C?

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

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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 rate of diffusion of helium gas (He) in air at 25°C and a pressure of 1 atm?

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

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What is the balanced redox reaction when copper metal reacts with silver nitrate solution to form copper (II) nitrate and silver metal?

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

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What is the power output (in Watts) of an electrochemical cell at standard conditions, given that the cell potential is 1.5V and the total resistance of the circuit is 10 ohms?

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

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What is the mass of 2,4-dinitrophenol that can be obtained from 5 grams of phenol and excess nitric acid using the preparation method to synthesize 2,4-dinitrophenol?

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

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What is the heat required to sublime 30 grams of dry ice (CO2) at a constant pressure of 1 atm? The 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 standard enthalpy change for the fusion of 100 grams of ice at 0°C to liquid water at 0°C? Assume that the specific heat capacity of ice and water are 2.09 and 4.18 J/g·°C, respectively, and the enthalpy of fusion of ice is 6.01 kJ/mol.

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

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What are the key components and their required amounts needed to design a cost-effective and high-performance system for the production of water-based interior wall paints with low VOC emissions?

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

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What is the standard enthalpy change of solution of 3.5 g of sodium hydroxide (NaOH) in 50 mL of water at a constant temperature of 25 °C?

asked Mar 1 in ThermoChemistry 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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1 answer 106 views

What is the purity of a sample of aspirin if its melting point is 134.5°C, compared to the literature value of 136°C? Calculate the percentage purity of the sample using the melting point range and known literature values.

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

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What is the standard enthalpy change when 50.0 mL of 0.200 M HCl is mixed with 50.0 mL of 0.200 M NaOH to form NaCl(aq) and H2O(l) at 25°C? Given: The specific heat capacity of the solution is 4.18 J/(g°C) and the density of the solution is 1.00 g/mL.

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

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How can we design an efficient treatment system for the removal of toxic heavy metals from industrial wastewater, such as lead and mercury, using chemical precipitation methods?

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

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What will be the effect on the equilibrium position of a redox reaction if the concentration of the reactants is doubled while the concentration of products remains unchanged? Provide a detailed explanation with appropriate calculations.

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

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What is the equilibrium constant for the formation of a complex ion [Fe(SCN)6]3- when mixing 0.1 M Fe(NO3)3 and 0.1 M KSCN? The absorbance of the [Fe(SCN)6]3- ion at 450 nm is found to be 0.60. Calculate the concentration of [Fe(SCN)6]3-.

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

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What is the theoretical yield of p-nitroaniline when 5 grams of aniline is reacted with 10 grams of nitric acid in the preparation of p-nitroaniline?

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

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What is the specific surface area of a porous material if 10 mL of nitrogen gas is adsorbed at 77 K and 1 atm and the resulting monolayer thickness is 2.5 nm? The cross-sectional area of a nitrogen molecule is 0.16 nm^2.

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

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What is the heat of neutralization for the reaction between 50 mL of 1.0 M hydrochloric acid (HCl) and 50 mL of 1.0 M sodium hydroxide (NaOH) at a room temperature of 25°C? The enthalpy of neutralization of HCl and NaOH is -57.1 kJ/mol.

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

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Sure. Here's a question:How can you calculate the oxidation number of an element in a compound and use it to determine if a redox reaction has occurred? Provide an example of a redox reaction and identify the oxidizing and reducing agents involved.

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

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