Q382
A solid metallic block weighing 5 kg has an initial temperature of 500°C. 40 kg of water initially at 25°C is contained in a perfectly insulated tank. The metallic block is brought into contact with water. Both of them come to equilibrium. Specific heat of block material is 0.4 kJ.kg-1.K-1. Ignoring the effect of expansion and contraction and also the heat capacity to tank, the total entropy change in kJ.kg-1.K-1 is
A.
-1.87
B.
0
C.
1.26
AnswerD.
3.91
Answer: Option C
Solution
Answer: Option C
Solution:
By energy balance So, we will get
We know,
on substitution will get