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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?
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Physical Chemistry
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How can we design a polymer-based sensor that can detect changes in temperature or pH levels in a given solution? What type of polymer should be used, and how can the sensor be calibrated to provide accurate readings?
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Polymer Chemistry
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In the production process of lubricants, how can the chemical engineer choose the most appropriate base oil and additives to achieve the desired viscosity and performance requirements while maintaining cost-effectiveness?
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Chemical engineering
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What is the standard enthalpy change for the reaction 2CO(g) + O2(g) → 2CO2(g) at standard conditions, given that the standard enthalpy of formation for CO, O2, and CO2 are -110.5 kJ/mol,-393.5 kJ/mol, and -393.5 kJ/mol, respectively?
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Chemical thermodynamics
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What is the probability that a system of two ideal gas particles in a closed container will have both particles in the same half of the container at a certain temperature? Use the canonical ensemble in statistical mechanics to calculate the probability.
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Physical Chemistry
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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?
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Chemical reactions
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What is the surface area of a sample of activated carbon if 10 mL of nitrogen gas (at a temperature of 25°C and a pressure of 1 atm) is adsorbed onto 0.1 g of the carbon with a monolayer capacity of 0.5 mL/g?
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Surface Chemistry
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What is the yield of 4-bromoacetanilide that can be obtained through the reaction of 10 grams of acetanilide with excess bromine in the presence of a catalyst, assuming 100% conversion and a 92% purity of the final product?
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Chemical synthesis
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What is the magnetic moment of a complex formed between iron(III) ion and ethylenediamine ligand (en) with a coordination number of 6?
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Inorganic Chemistry
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What is the pH of a solution with a concentration of 0.1 M hydrochloric acid?
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Chemical reactions
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What is the yield of 2,4-dichloronitrobenzene produced from the reaction of 10 grams of nitrobenzene and excess chlorine gas, given that the reaction conditions were optimal and the purity of the final product was determined to be 95%?
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Mar 1
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Chemical synthesis
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What is the standard enthalpy change for the phase transition reaction of water from ice to liquid at 25°C and 1 atm pressure?
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Chemical thermodynamics
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What is the yield of 2,4-dichlorobenzoic acid formed when 10 grams of benzoic acid and excess chlorine gas are used in the synthesis, if the actual yield obtained is only 6.5 grams?
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Mar 1
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Chemical synthesis
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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?
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Mar 1
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Chemical education
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What is the heat required to raise the temperature of 75 g of water from 25°C to 90°C? Given that the specific heat capacity of water is 4.18 J/g°C.
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Mar 1
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ThermoChemistry
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What is the enthalpy change for dissolving 10 grams of sodium chloride (NaCl) in 100 mL of water at 25°C? The heat capacity of water is 4.18 J/(g·°C) and the enthalpy of formation of NaCl is -411.1 kJ/mol.
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Mar 1
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ThermoChemistry
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How can you design an experiment that utilizes limited resources to demonstrate the concepts of acid-base neutralization and calculate the molarity of an unknown acid solution?
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Mar 1
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Chemical education
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What is the standard enthalpy change for the following reaction, where 2 moles of solid iron (Fe) reacts with 1 mole of oxygen gas (O2) to produce 2 moles of solid iron (III) oxide (Fe2O3)? 4Fe(s) + 3O2(g) -> 2Fe2O3(s)
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Mar 1
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Chemical thermodynamics
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89
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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?
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Mar 1
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Chemical synthesis
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What is the standard enthalpy change for the transition of ice to water if 50 grams of ice is heated from -10 °C to 50 °C? The molar mass of water is 18 g/mol and the specific heat capacity of ice and water are 2.09 J/g°C and 4.18 J/g°C, respectively.
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Mar 1
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Chemical thermodynamics
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