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When a giant Asian hornet enters a beehive, bees rush to the predator forming a dense ball of bees around it with a combined mass
When a giant Asian hornet enters a beehive, bees rush to the predator forming a dense ball of bees around it with a combined mass of 53g. The hive interior temperature is 32C. The temperature inside the ball increases due to low heat loss. This heating lasts for 20min after which the bees fly off leaving a dead hornet as honeybees can tolerate elevated temperatures. (a) Calculate the final temperature of the bee ball given that they emit 7.6 W. Assume that the bees and the hornet are comprised of water Cv (water) =75.3JK1mol1 ). [5] (b) Calculate the entropy generated when glucose (a major component of honey) is heated at constant pressure from 25C to 32C. The heat capacity of glucose is Cp111.46Jmol1K1. [2] (c) 150cm3 of glucose (C6H12O6) is added to a beaker containing 400cm3 of water. Given that the density of glucose is 1.56gcm3 and the saturated vapour pressure of water at 25C is 3173Pa, calculate the vapour pressure of the water at 25C. [4] (d) Using a suitable diagram, briefly explain the effect of adding glucose to the boiling temperature of water. (e) What is the osmotic pressure generated at 25C by a solution of 150cm3 of glucose, C6H12O6, in 400cm3 of water at 298K ? [3]
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