Question

The entropy of a mixture of ideal gas is the sum of the entropy of constituent evaluated at

Answer 1

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The entropy of a mixture of ideal gases is equal to the sum of the entropy of constituent evaluated at the $\mathscr\green{mixture\: temperature}$.

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Answer 2

Explanation:

Entropy increases when two substances mix with each other. For example, the entropy of mixing of two different gases are given by ΔS=2NklnVfVi. But, the entropy doesn't increase when the two gases mixing are same.