Question
A 39 g ice cube at -69°C is placed in a lake whose temperature is 65°C....
A 39 g ice cube at -69°C is placed in a lake whose temperature is 65°C. Calculate the change in entropy of the cube-lake system as the ice cube comes to thermal equilibrium with the lake. The specific heat of ice is 2220 J/kg-K. (Hint: Will the ice cube affect the temperature of the lake?) Numbe UnitšT J/k the tolerance is +/-2% Click if you would like to Show Work for this question: Open Show Work
Answers
s = Q/T ... by definition of entropy
Q = mc dT = 0.039 x 2220 x (65-(-69))
= 11601.7 J
T= 65+273 = 338K
s = 34.32 J/K
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