The U.S. Food and Drug Administration lists dichloromethane (CH 2 Cl 2 ) and car

Question

The U.S. Food and Drug Administration lists dichloromethane (CH2Cl2) and carbon tetrachloride (CCl4) among the many chlorinated organic compounds that are carcinogenic (cancer-causing). What are the partial pressures of these substances in the vapor above a solution of 1.88 mol of CH2Cl2 and 1.23 mol of CCl4 at 23.5

The U.S. Food and Drug Administration lists dichloromethane (CH2Cl2) and carbon tetrachloride (CCl4) among the many chlorinated organic compounds that are carcinogenic (cancer-causing). What are the partial pressures of these substances in the vapor above a solution of 1.88 mol of CH2Cl2 and 1.23 mol of CCl4 at 23.5 degree C? The vapor pressures of pure CH2Cl2 and CCl4 at this temperature are 352 torr and 118 torr, respectively. (Assume ideal behavior.) PCH2Cl2

Explanation / Answer

mole fraction of CH2Cl2 = 1.88/(1.88+1.23) = 0.6

hence partial pressure of CH2Cl2 = 352*0.6 = 212.78 torr

similarly

mole fraction of CCl4 = 1.23/(1.88+1.23) = 0.4

hence partial pressure of CCl4 = 118*0.4 = 47.2 torr

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