Hard Practice — Advanced Set

Hard Practice — Multi-step Estimation & Method Choice

Chain the working: combustion / Carius / Kjeldahl / Dumas data $\to$ % of each element $\to$ mole ratio $\to$ empirical $\to$ molecular formula; and choose the right purification technique with reasoning.

• $\%C=\dfrac{12}{44}\cdot\dfrac{m_{CO_2}}{m}\cdot100$, $\%H=\dfrac{2}{18}\cdot\dfrac{m_{H_2O}}{m}\cdot100$, O by difference.
• $\%X=\dfrac{\text{at.mass}}{\text{molar mass AgX}}\cdot\dfrac{m_{AgX}}{m}\cdot100$; Kjeldahl $\%N=\dfrac{1.4\,NV}{m}$; molecular $=(\text{empirical})_n$.