A Styrofoam Cup Holding 125g

Question:

iii.) A Styrofoam cup holding 125g ofhot water at 100PC cools to room temperature, twenty.09C. We will neglect the specific estrus of the cup and whatsoever change in temperature of the room. What amount of oestrus is released from the water equally information technology cools downwardly? (Recall the specifie oestrus of water is 4186 J/kg"C) What is the change in entropy in the room?

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Video Transcript

here we have to summate the change of entropy in the room Due to the cooling down 1/4. Then this entropy of the room. At that place'south the heirs of the room. He goes to negative delta Q of water. Oh should a negative queue of water or amount of heat lost past water divided by the temperature of the and then that is heat capacity of water times mass of h2o, times the initial temperature of water minus final temperature or temperature of the room. And equally divided by temperature of the room. And then that'due south calculated. So here um we have the departure in Celsius and this is the same as different kelvin. So therefore that'southward hundreds minus 22.0 kelvin. And that is divided by temperature of the room Which is 22 which has to be in kelvin. That is 200 And 95 billion. So now we can tin can complete this calculation Now that goes 228.iv Dual procurement that is roughly 128 gem per Killian. Let me come double check my calculations. Yes, it seems to be right. I hope I helped you. Thank yous very much for attending by