A solution is prepared by mixing 50.0 mL toluene (...

Question

A solution is prepared by mixing 50.0 mL toluene (C6H5CH3, d = 0.867 g/cm3) with 125 mL benzene (C6H6, d = 0.874 g/cm3). Assuming that the volumes add on mixing, calculate the mass percent, mole fraction, molality, and molarity of the toluene.

Jules Bruno · Accepted Answer

Part A. Percent mass.50.0 mL toluene (C6H5CH3, d = 0.867 g/cm3)50.0 mL×1 cm31 mL×0.867 gcm3=43.35 g125 mL benzene (C6H6, d = 0.874 g/cm3)125 mL×1 cm31 mL×0.847 gcm3=105.875 g[readmore]Percent mass of toluene:% mass=mass solutemass solution×100%% mass=43.35 g43.35 g+105.875 g×100%% mass=43.35 g149.225 g×100%% mass=0.2905×100% % mass = 29.05 % Part B. Mole fractionmolar mass toluene → 92.14 g/molmol toluene=43.35 g×1 mol92.14 g=0.47 molmolar mass benzene → 78.11 g/molmol toluene=105.875 g×1 mol78.11 g=1.355 molMole fraction of toluene:mole fraction (X)=moles of solutemoles of solutionXtoluene=mole toluenemole solutionXtoluene=mole toluenemole toluene+mole benzeneXtoluene=0.47 mol0.47 mol+1.355 molXtoluene=0.47 mol1.825 molXtoluene = 0.2575Part C. Molalitysolute: mole toluene = 0.47 molsolvent: mass benzene = 105.875 g1 g = 10-3 kgMolality(m)=moles solutekg solventMolality(m)=0.47 mol105.875 g×1 kg103 gMolality(m)=0.47 mol0.105875 kgMolality(m)=4.44molkg  Molality (m) = 4.44 mPart D. Molaritysolute: mole toluene = 0.47 molsolution:volume benzene = 50.0 mLvolume toluene = 125.0 mL1 mL = 10-3 LMolarity(M)=moles of soluteLiters of solutionMolarity(M)=0.47 mol50 mL+125 mLMolarity(M)=0.47 mol175 mL×10-3 L1 mLMolarity(M)=0.47 mol0.175 LMolarity(M)=2.69molL  Molarity (M) = 2.69 M

Problem: A solution is prepared by mixing 50.0 mL toluene (C6H5CH3, d = 0.867 g/cm3) with 125 mL benzene (C6H6, d = 0.874 g/cm3). Assuming that the volumes add on mixing, calculate the mass percent, mole fraction, molality, and molarity of the toluene.

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Problem: A solution is prepared by mixing 50.0 mL toluene (C6H5CH3, d = 0.867 g/cm3) with 125 mL benzene (C6H6, d = 0.874 g/cm3). Assuming that the volumes add on mixing, calculate the mass percent, mole fraction, molality, and molarity of the toluene.

FREE Expert Solution

Problem Details

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