+91-87964 74404
FlagBACK
Question icon
Grade 11Physical Chemistry

A bottle of whisky contains 12%aqueous ethanol by volume. The density of ethanol (C2H5OH) is
0.8 g/cm3 .Calculate.

Profile image of HARSH2OP
5 Years agoGrade 11
Answers icon

1 Answer

Profile image of Ayush Raj
5 Years ago
Given %v/v =12%, means 12ml solute(ethanol) in 100ml solution.
 
Thus, mass of ethanol =v×d =12×0.8 =9.6gm
       moles of ethanol=9.6/46 mol
 
   Volume of solvent =(100-12)ml=88ml
  Here, solvent H2O , so density of solvent =1g/ml
      Mass of solvent =88×1=88gm
  
 Mass of solution=mass of solute+mass of solvent
                            =9.6+88=97.6gm
 
Now, a) molality = moles of solute /mass of solvent in kg
   =9.6/46 ÷88/1000 = 2.37m
 
       b) Molarity =moles of solute/volume of solution in Litre 
     =9.6/46 ÷ 100/1000 = 2.08M
 
   c) %w/w =(mass of solute/mass of solution) ×100
                =(9.6 ÷ 97.6) ×100 = 9.83%
 
Thanks. 
It was a brilliant question, where most important thing was to take volume conserved. 
 

Other Related Questions on physical chemistry

question mark
Which of the following aqueous solutions remains neutral after
electrolysis
physical chemistry
0 Answer Available

Last Activity: 3 Years ago

question mark
In the reaction A + 2B ⇌ 2C, if 2 moles of A, 3 moles of B and 2 moles of C are placed in a 2 L flask and
the equilibrium concentration of C is 0.5 mol/L. The equilibrium constant (KC) for the reaction is.....and please tell how you know that the reaction is going forward .. imean how to calculate the reaction quotient ???
 
physical chemistry
1 Answer Available

Last Activity: 3 Years ago

question mark
True or false when an electron in ground state of hydrogen atom is excited with an energy that is greayer than e2-e1 but less than e3-e1 the electron will get excited n=2
physical chemistry
1 Answer Available

Last Activity: 3 Years ago

question mark
18 19 gram mixture of na2co3 and nahco3 on heating gives 2.2 gram CO2 gas find the percent nahco3 (by mass) in mixture
physical chemistry
1 Answer Available

Last Activity: 4 Years ago

question mark
A 100 cm cube solution of sodium carbonate is prepared by dissolving 8.653 g of salt in water the density of solution is 1.0816g per ml what are the molarity and molality of the solution.
 
physical chemistry
1 Answer Available

Last Activity: 4 Years ago