To calculate the required energy, which was released as a result of condensation of alcohol vapor, we apply the formula: Q = L * m.
Variables and constants: L – specific heat of condensation of alcohol vapor (L = 0.9 * 10 ^ 6 J / kg); m is the mass of alcohol vapor (m = 80 g = 0.08 kg).
Let’s perform the calculation: Q = L * m = 0.9 * 10 ^ 6 * 0.08 = 72 * 10 ^ 3 J (72 kJ).
Answer: When 80 g of alcohol vapor is condensed, 72 kJ of thermal energy will be released.
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