Discussion :: Chemical Engineering Thermodynamics
- 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
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Answer : Option B
Explanation :
By energy balance mcp(Ti−Tf) of block=mcp(Tf−Ti) of water
So, we will get Tf=303.16k
We know,
ΔStotal=ΔSBLOCK+ΔSWATER⇒Δs=mcplnTfTI+mcplnTfTi
⇒ on substitution w will get Δs=−1.869+3.118=1.26
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