Chapter 10, Problem 67QAP

Interpretation Introduction

Interpretation:

The boiling temperature of pure bromobenzene C₆H₅Br is 156.0°C. The boiling point constant of bromobenzene is 6.26°C/m. The anthracene, C₁₄H₁₀ contaminated the sample of bromobenzene. The temperature 159.2°C is the boiling point temperature of the impure sample of bromobenzene. The purity of the sample in terms of mass percent is to be determined.

Concept introduction:

The following formulas will be used:

  $\text{Molality=}\frac{\text{ moles solute}}{\text{mass solvent(kg)}}$

  $\Delta T_b=k_b\times molality$

  $\Delta T_b=T_b-T_b°$

  $\text{number of moles=}\frac{\text{mass}}{\text{molar mass}}$

  $\text{Mass\% of solution=}\frac{\text{Mass of solution}}{\text{total mass}}\text{×100}$