You pour 250 g of tea into a Sturofoam cup, initally at 80 C and stirs in a litt

Question

You pour 250 g of tea into a Sturofoam cup, initally at 80 C and stirs in a little sugar using a 100-g aluminum 20 C spoom and leave the spoon in the cup. Assume the specific heat of the tea is 4180 J/kg C and the specific heat of aluminum is 900 J/kg C.
Part A What is the highest possible tenperature of the spoon when you finally take it out the cup?
Part B Problem 12.17 You pour 250 g of tea into a Styrofoam cup, initially at 80 Cand stir in a little sugar using a 100-g aluminum 20 Cspoon and leave the spoon in the aup Assume the specific heat of tea is 4180 J/kg. C and the specific heat of aluminum is 900 J/kg C O Ask me anything 0 0 Part A What is the highest possible temperature of the spoon when you finally taka it out of the cup? Express your answer using two significant figures. Submit My Answers Give Up Part B What is the temperature of the tea at that tme? Express your answer using two significant figures. Submit Mr Answers Give up a

Explanation / Answer

Q (heat) = Cp (Specific Heat)×mass×(d)T(Temperature change)

Q lost = Q gained

4.18kJ/kgC×.25kg×(80°C-Tf) = .9kJ/kgC×.1kg×(Tf-20°C)

83.6-1.045Tf = .09Tf - 1.8

85.4 = 1.135Tf

Tf = 85.4/1.135 = 75.24°C

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