2019-05-16T04:31:59-04:00
Phenylcarbinol is used in nasal sprays as a preservative. A solution of 0.52 g of the compound in 25.0 g of water has a melting point of-0.36 °C. What is the molar mass of phenylcarbinol? (Kp for water is -1.858°C/m.)
1
2019-05-22T01:00:07-0400
n = m M = 0.52 g M n= \frac{m}{M}= \frac{0.52 g}{M} n = M m = M 0.52 g m o l a r i t y = n m ( w a t e r ) = 0.52 g M 0.025 k g = 0.52 g M × 0.025 molarity= \frac{n}{m(water)}=\frac{\frac{0.52 g}{M}}{0.025 kg}= \frac{0.52 g}{M\times0.025} m o l a r i t y = m ( w a t er ) n = 0.025 k g M 0.52 g = M × 0.025 0.52 g
Δ T f p = k f × m o l a r i t y \Delta T_{fp}=k_f\times molarity Δ T f p = k f × m o l a r i t y
− 0.36 = − 1.858 × 0.52 M × 0.025 -0.36= -1.858\times \frac{0.52}{M\times 0.025} − 0.36 = − 1.858 × M × 0.025 0.52
M = 107.35 g m o l M=107.35\frac{g}{mol} M = 107.35 m o l g
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