A solution of methylene chloride (CH2Cl2) and ethanol (CH3CH2OH) that is 25.% methylene chloride by mass is boiling at 69.7°C. The vapor is collected and cooled until it condenses to form a new solution. only round for final anwer not during math please!   Calculate the percent by mass of methylene chloride in the new solution. Here's some data you may need:   normal boiling point density vapor pressure at  69.7°C methylene chloride 40.°C 1.3gmL 1949.torr ethanol 78.°C 0.79gmL 545.torr Be sure your answer has 2 significant digits. Note for advanced students: you may assume the solution and vapor above it are ideal.

A certain liquid X has a normal boiling point of 134.00 °C and a boiling point elevation constant K =1.40 °C.kg⋅mol¯¹. Calculate the boiling point of a solution b made of 82.g of alanine (C3H₂NO₂) dissolved in 600. g of X. Round you answer to 4 significant digits. [J]°C x10 X 1 Ś

The freezing point of benzene, C6H₁, is 5.50 °C at 1 atmosphere. A nonvolatile, nonelectrolyte that dissolves in benzene is DDT. A student dissolves 11.78 grams of DDT, C14H9 C15 (354.5 g/mol), in 252.1 grams of benzene. Use the table of boiling and freezing point constants to answer the questions below. Solvent Water Ethanol Chloroform Benzene Formula H₂O CH3 CH₂ OH CHC13 C6H6 Diethyl ether CH3 CH₂ OCH2 CH3 The molality of the solution is The freezing point of the solution is Kb (°C/m) Kf (°C/m) 1.86 1.99 0.512 1.22 3.67 2.53 2.02 m. °C. 5.12

At a certain temperature the vapor pressure of pure chloroform (CHCI,) is measured to be 203. torr. Suppose a solution is prepared by mixing 54.2 g of chloroform and 106. g of acetyl bromide (CH,COBR). Calculate the partial pressure of chloroform vapor above this solution. Round your answer to 3 significant digits.