Calculate the molality of $2.5 \ g$ of ethanoic acid $(CH_{3}COOH)$ in $75 \ g$ of benzene.
- A$0.556 \ mol \ kg^{-1}$
- B$0.456 \ mol \ kg^{-1}$
- C$0.656 \ mol \ kg^{-1}$
- D$0.356 \ mol \ kg^{-1}$
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Calculate the mole fraction of benzene in a solution containing $30\%$ by mass in carbon tetrachloride.
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