At a given temperature, the vapor pressure of pure acetone (ch3coch3, 58.00 g/mol) is 342 torr. at the same temperature, the vapor pressure of pure chloroform (chcl3, 119.35 g/mol) is 230 torr. consider a solution containing 23.2 g of acetone and 73.8 g of chloroform. calculate the total vapor pressure above the solution (in torr to 0 decimal places)

Total vapor pressure = 274 torr

Explanation:

According to Raoult´s law, the partial  pressure of a volatile compound in a mixture of two volatile components is

PA = Xa PºA where PA = partial pressure of component A

                                XA = mole fraction of A= mol A / (molA + Mol B)

                                PºA = vapor pressure of pure A

and the total pressure will be given by the sum of the partial pressures.

mol CH3COCH3 = 23.2 g/ 58 g/mol = 0.40 mol

mol CHCl3 = 73.8 g/ 119.35 g/mol = 0.62 mol

total mol = 0.40 mol +0.62 mol =  1.02 mol

XCH3COCH3  = 0.40 mol / 1.02 mol = 0.39

XCHCl3 = 0.62 mol / 1.02 mol = 0.61

PCH3COCH3 = 0.39 x 342 torr = 133.4 torr

PCHCl3 = 0.61 x 230 torr = 140.3 torr

Ptotal = 133.4 torr + 140.3 torr = 274 torr

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