Which of the following compounds has the high | vedclass

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(B) Standard molar entropy is a measure of the disorder or randomness of a substance at $1 \ bar$ pressure and a specified temperature. For substances

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$SO_{3(g)}$

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(B) Standard molar entropy is a measure of the disorder or randomness of a substance at $1 \ bar$ pressure and a specified temperature. For substances in the same physical state (gas), entropy generally increases with increasing molecular complexity and molecular mass. Comparing the molar masses: $CO_{(g)} = 28 \ g/mol$ $CO_{2(g)} = 44 \ g/mol$ $SO_{2(g)} = 64 \ g/mol$ $SO_{3(g)} = 80 \ g/mol$ Since $SO_{3(g)}$ has the highest molecular mass and the greatest number of atoms among the given options, it possesses the highest degree of vibrational and rotational complexity, leading to the highest standard molar entropy. Therefore, the correct option is $B$.

Which of the following compounds has the highest standard molar entropy?

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