Answers by ShaynaHyatt3

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Calculate the standard enthalpy change for the reaction between 2.00 moles of liquid ethanol (C2H5OH) and 3.50 moles of gaseous oxygen (O2) to form carbon dioxide (CO2) gas and liquid water (H2O) at 25°C and standard pressure. The balanced chemical equation for the reaction is C2H5OH + 3O2 → 2CO2 + 3H2O. (The molar enthalpies of formation for C2H5OH, CO2, and H2O are -277.6 kJ/mol, -393.5 kJ/mol, and -285.8 kJ/mol, respectively.)

answered Feb 3 in Chemical thermodynamics

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What is the concentration of caffeine in a sample of coffee using liquid chromatography?

answered Jan 30 in Analytical Chemistry

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Calculate the heat of crystallization, in kilojoules per mole, when 50.0 grams of sodium hydroxide (NaOH) is dissolved in 500.0 grams of water at 25⁰C and then cooled to 5⁰C, assuming that all the heat evolved during the process is transferred to the solution. The heat capacity of water is 4.18 J/gK, and the enthalpy of formation of NaOH is -425 kJ/mol.

answered Jan 23 in ThermoChemistry

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A chemistry student needs to determine the equilibrium constant (Kc) for the reaction: N2(g) + 3H2(g) ⇌ 2NH3(g)At a certain temperature, 0.2 mole of nitrogen gas (N2), 0.3 mole of hydrogen gas (H2), and 0.4 mole of ammonia gas (NH3) were placed in a 1 L container. Using these initial concentrations, what is the equilibrium constant (Kc) for the reaction?

answered Jan 22 in Chemical equilibrium

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When should debriefing occur in a research study?

answered Jan 17 in Psychology

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Please compare and contrast the social learning and cognitive-behavioural approaches to therapy.

answered Jan 15 in Psychology

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What is the difference between instrumental and emotional support?

answered Jan 14 in Psychology

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What is the si unit for electric current?

answered Jan 7 in Science

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