delta Tb = 78.685 - 78.500
= 0.185 oC
use:
delta Tb = Kb*mb
0.185 = 1.22 *mb
mb= 0.1516 molal
m(solvent)= 294.1 g
= 0.2941 kg
use:
number of mol,
n = Molality * mass of solvent in Kg
= (0.1516 mol/Kg)*(0.2941 Kg)
= 4.46*10^-2 mol
mass(solute)= 12.13 g
use:
number of mol = mass / molar mass
4.46*10^-2 mol = (12.13 g)/molar mass
molar mass = 2.72*10^2 g/mol
Answer: 272 g/mol
The boiling point of ethanol, CH3CH,OH, is 78.500 °C at 1 atmosphere. Ky ethanol) = 1.22...
The boiling point of ethanol, CH3CH2OH, is 78.500 °C at 1 atmosphere. Kb(ethanol) = 1.22 °C/m In a laboratory experiment, students synthesized a new compound and found that when 13.27 grams of the compound were dissolved in 287.9 grams of ethanol, the solution began to boil at 78.706 °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
1. The boiling point of ethanol, CH3CH2OH, is 78.500 °C at 1 atmosphere. Kb(ethanol) = 1.22 °C/m In a laboratory experiment, students synthesized a new compound and found that when 11.40 grams of the compound were dissolved in278.0 grams of ethanol, the solution began to boil at 78.673 °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 2. Match the following aqueous solutions with...
The boiling point of diethyl ether, CH,CHOCH.CH3, is 34.500 °C at I atmosphere. Ky(diethyl ether) = 2.02 °C/m In a laboratory experiment, students synthesized a new compound and found that when 11.14 grams of the compound were dissolved in 298.6 grams of diethyl ether, the solution began to boil at 34.584 °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 Submit Answer Retry Entire Group 1...
A. The boiling point of diethyl ether, CH3CH2OCH2CH3, is 34.500 °C at 1 atmosphere. Kb(diethyl ether) = 2.02 °C/m In a laboratory experiment, students synthesized a new compound and found that when 10.22 grams of the compound were dissolved in 249.9 grams of diethyl ether, the solution began to boil at 34.714 °C. The compound was also found to be nonvolatile and a non-electrolyte. What is the molecular weight they determined for this compound ? B. The boiling point of...
The boiling point of diethyl ether, CH,CH,OCH,CHg, 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 10.45 grams of the compound were dissolved in 273.2 grams diethyl ether, the solution began to boil at 34.718 °C. The compound was also found to be nonvolatile and a non-clectrolyte. What is the molecular weight they determined for this compound? g/mol Submit Answer Retry Entire Group 9...
The boiling point ofchloroform, CHCl3, is61.700 °C at 1 atmosphere. Kb(chloroform) = 3.67 °C/m In a laboratory experiment, students synthesized a new compound and found that when 12.35 grams of the compound were dissolved in 238.3 grams of chloroform, the solution began to boil at 62.398 °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 chloroform, CHCl3, is 61.700 °C at 1 atmosphere. Kb(chloroform) = 3.67 °C/m In a laboratory experiment, students synthesized a new compound and found that when 12.07 grams of the compound were dissolved in 292.7 grams of chloroform, the solution began to boil at 62.540 °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 water, H2O, is 100.000 °C at 1 atmosphere. Kb(water) = 0.512 °C/m In a laboratory experiment, students synthesized a new compound and found that when 13.10 grams of the compound were dissolved in 212.3 grams of water, the solution began to boil at 100.092 °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 freezing point of ethanol, CH3CH2OH, is -117.300 °C at 1 atmosphere. Kf(ethanol) = 1.99 °C/m In a laboratory experiment, students synthesized a new compound and found that when 12.98 grams of the compound were dissolved in 255.2 grams of ethanol, the solution began to freeze at -117.651 °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
can y’all help me please? The freezing point of water, H2O, is 0.000 °C at 1 atmosphere. K(water)--1.86 °C/m In a laboratory experiment, students synthesized a new compound and found that when 12.51 grams of the compound were dissolved in 213.6 grams of water, the solution began to freeze at -1.813 °C. The compound was also found to be nonvolatile and a non-electrolyte What is the molecular weight they deterfnined for this compound ? g/mol The boiling point of chloroform,...