Calculate the molecular weight of a substance whose \( 7.0 \% \) by mass solution in water freez....

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Calculate the molecular weight of a substance whose
\( \mathrm{P} \)
\( 7.0 \% \) by mass solution in water freezes at \( -0.93^{\circ} \mathrm{C} \). The cryoscopic constant of water is \( 1.86^{\circ} \mathrm{C} \mathrm{kg} \mathrm{mol}^{-1} \)
(1) \( 140 \mathrm{~g} \mathrm{~mol}^{-1} \)
(2) \( 150.5 \mathrm{~g} \mathrm{~mol}^{-1} \)
(3) \( 160 \mathrm{~g} \mathrm{~mol}^{-1} \)
(4) \( 155 \mathrm{~g} \mathrm{~mol}^{-1} \)


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