# A 50kg copper block initially at 180 degrees C is dropped into an isolated tank containing 90 L of water at 15 degrees C. Determine the final equilibrium temperature and the total entropy change for the process.

Question

A 50kg copper block initially at 180 degrees C is dropped into an isolated tank containing 90 L of water at 15 degrees C. Determine the final equilibrium temperature and the total entropy change for the process.

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Step 1

first we have to consider the total change in internsl energy of he system as shown below

here one of the know assumption is

substitute this value in above equation we get

substitute above value in given equation we get

Step 2

we have to calculate the mass of water we get

find the final equilibrium temperature of the tank by using equation 1 we get

and then substitute requires values

then the value of final equilibrium temperature is 296.07K

Step 3

find the total entropy change furing the process by using below formula we get

firest we have...

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### Mechanical Engineering 