Equation for entropy of system in equilibrium - Thermodynamics

Q.  What is the equation for entropy of a system if two parts 1 and 2 having entropies S1 and S2 are considered in equilibrium?
- Published on 21 Aug 15

a. S = S1 – S2
b. S = S1 + S2
c. S = (S1 + S2) / 2
d. S = √S1 S2

ANSWER: S = S1 + S2

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