Answer:
a) 
b) 
Explanation:
Given:
- mass of copper,

- initial temperature of copper,

- specific heat capacity of copper,

- mass of water,

- initial temperature of water,

- specific heat capacity of water,

a)
<u>∵No heat is lost in the environment and the heat is transferred only between the two bodies:</u>
Heat rejected by the copper = heat absorbed by the water


b)
<u>Now the amount of heat transfer:</u>



∴Entropy change



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