Cyclohexane has a freezing point of 6.50 °C and a Kf of 20.0 °C/m. What is the freezing point of a solution made by dissolving 0.694 g of biphenyl (C12H10) in 25.0 g of cyclohexane? Express the temperature numerically in degrees Celsius.
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Step 1
Given: - Mass of biphenyl = 0.694 g - Molar mass of biphenyl (C12H10) = 154.21 g/mol Number of moles = Mass / Molar mass Number of moles = 0.694 g / 154.21 g/mol Number of moles = 0.0045 mol Show more…
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David C.
Part A Cyclohexane has a freezing point of 6.50 °C and Kf of 20.0 °C/m. What is the freezing point of a solution made by dissolving 0.771 g of biphenyl (C12H10) in 25.0 g of cyclohexane? Express the temperature numerically in degrees Celsius. Part B Paradichlorobenzene, C6H4Cl2, is a component of mothballs. A solution of 2.00 g in 22.5 g of cyclohexane boils at 82.39 °C. The boiling point of pure cyclohexane is 80.70 °C. Calculate Kb for cyclohexane. Express the constant numerically in degrees Celsius per molal.
Adi S.
The freezing point of a solution of $2.40 \mathrm{~g}$ of biphenyl $\left(\mathrm{C}_{12} \mathrm{H}_{10}\right)$ in $75.0 \mathrm{~g}$ of benzene $\left(\mathrm{C}_{6} \mathrm{H}_{6}\right)$ is $4.40^{\circ} \mathrm{C}$. The normal freezing point of benzene is $5.50^{\circ} \mathrm{C}$. What is the molal freezing point constant $\left({ }^{\circ} \mathrm{C} / \mathrm{m}\right)$ for benzene? (a) $-5.3$ (b) $-5.1$ (c) $-4.6$ (d) $-4.8$
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