In a calorimetry experiment to determine the enthalpy of combustion of ethanol, a 100 g water sample increases in temperature by 20.0°C. What is the heat absorbed by the water? (Specific heat of water = 4.18 J/g•°C)
Correct answer: B. 8360 J
- A. 4180 J
- B. 8360 J
- C. 10450 J
- D. 20900 J
Explanation
Heat q=m × c × ∆T = 100 × 4.18 x 20.0= 8360 J.
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Separation methods are selected according to differences in solubility, particle size, volatility and sublimation behaviour. Filtration and crystallisation separate insoluble or dissolved solids, sublimation isolates suitable volatile solids, distillation separates liquids by boiling point, and solvent extraction transfers a substance between immiscible solvents.
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