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The boiling point of diethyl ether, CH3 CH₂ OCH2 CH3, is 34.500 °C at 1 atmosphere. K, (diethyl ether) = 2.02 °C/m In a laboratory experiment, students synthesized a new compound and found that when 13.33 grams of the compound were dissolved in 218.2 grams of diethyl ether, the solution began to boil at 34.638 °C. The compound was also found to be nonvolatile and a non-electrolyte. What is the molecular weight they determined for this compound? g/mol
The boiling point of benzene C6H6 is 80.10 °C at 1 atmosphere. A nonvolatile, nonelectrolyte that dissolves in benzene is TNT (trinitrotoluene). How many grams of TNT, C7H5 N3O6 (227.1 g/mol), must be dissolved in 288.0 grams of benzene to raise the boiling point by 0.400 °C? Refer to the table for the necessary boiling or freezing point constant. Solvent Formula Kb (°C/m) Kf(°C/m) 0.512 H₂O CH3 CH₂OH Chloroform CHC13 3.67 Benzene C6H6 2.53 Diethyl ether CH3 CH₂ OCH2 CH3 2.02 Mass= Water Ethanol g 1.22 1.86 1.99 5.12
The freezing point of water H₂O is 0.00 °C at 1 atmosphere. A nonvolatile, nonelectrolyte that dissolves in water is antifreeze (ethylene glycol). How many grams of antifreeze, CH₂ OHCH₂ OH (62.10 g/mol), must be dissolved in 239.0 grams of water to reduce the freezing point by 0.450 °C? Refer to the table for the necessary boiling or freezing point constant. Solvent K(°C/m) K(°C/m) Formula Water 0.512 Ethanol 1.22 Chloroform 3.67 Benzene C6H6 2.53 Diethyl ether CH3 CH2 OCH2 CH3 2.02 Mass= H₂O CH3 CH₂OH CHC13 9 1.86 1.99 5.12