Question
Download Solution PDFIf 30 J of energy is added to water in the form of heat at 27 °C , what is the change in entropy of water?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFCONCEPT:
- Entropy: Entropy is a measure of the disorder of a system.
- Entropy also describes how much energy is not available to do work.
Mathematically entropy is calculated by ΔS:
\(ΔS= {Q \over T}\)
where Q is the heat transferred energy to the system during a process, and T is the temperature in K at which the process takes place.
Q → +ve (when the heat is transferred to the system)
Q → -ve (when the heat is taken out of the system)
CALCULATION:
Given that Q = 30 J and T = 27 °C = (273 + 27) K = 300 K
\(ΔS= {Q \over T} ={30 \over 300}=0.100 \space J/K\)
So the correct answer is option 4.
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