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Chemistry Question on Mole concept and Molar Masses

When 3 moles of gas A is mixed with 1 mole of gas B at room temperature and 1 atm pressure, the entropy of mixing is
(Given log 3=0.4771,
log 4 = 0.6020)

A

−18.70  JK−1-18.70 \;JK^{-1}

B

+18.70  JK−1+18.70 \;JK^{-1}

C

+4.65  JK−1+4.65 \;JK^{-1}

D

−4.65  JK−1-4.65 \;JK^{-1}

Answer

+18.70  JK−1+18.70 \;JK^{-1}

Explanation

Solution

The correct answer is (B) :+18.70  JK−1+18.70 \;JK^{-1}