Answers by ChristinaPae

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Calculate the standard enthalpy change for the formation of ethylene glycol (C2H6O2) from its elements given that the standard enthalpies of formation of carbon dioxide, water, and ethylene glycol are -393.5 kJ/mol, -285.8 kJ/mol, and -421.1 kJ/mol respectively.

answered 2 days ago in Chemical thermodynamics

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A chemical engineer needs to design a distillation column for the separation of a mixture containing ethanol (boiling point of 78.4°C) and water. The desired composition of the distillate is a minimum of 90% ethanol. What is the minimum number of theoretical trays needed in the column to achieve this composition, given that the feed contains 40% ethanol and the reflux ratio is 1.5?

answered Jan 22 in Chemical engineering

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According to Seligman's learned helplessness theory, what is the cause of depression?

answered Jan 16 in Psychology

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What is overt observation?

answered Jan 15 in Psychology

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How do hearing impairments occur?

answered Jan 14 in Psychology

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What is an attitude?

answered Jan 14 in Psychology

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What is the relationship between depression and anxiety?

answered Jan 14 in Psychology

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What type of plants grow on other plants?

answered Jan 8 in Science

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