Chapter 14 Quizes

  1. An organic solution is 72% water.  If the density of the organic material is 1.3 g/mL and the molecular weight is 64 g/mol, calculate the molarity of the solution. 

 

2. Commercial vinegar has been analytically determined to be 10.2% acetic acid

(CH3COOH) by mass.  The molecular mass of acetic acid is 60 g/mol.  The density of vinegar is 1.01g/mL.  Calculate the molarity of acetic acid in 50 mL of vinegar.

 

 

 

 

3.  What is the molarity of a solution that is 3.6% my mass NaOH.  The molecular mass of NaOH is 40 g/mol, and the density of the solution is 1.0g/mL.

                     

 

 

       

4.   A 2.7M solution is found to be composed of 8.3% by mass of an unknown organic compound.  The density of the solution was experimentally determined to be 1.5g/mL.  In order for a scientist to identify the compound, he must know the molecular mass.  Calculate the molecular mass of the unknown compound.

 

 

 

5.      Calculate the molar concentration of a solution containing 11.8g MgBr2 dissolved in 100mL of water.  The density of the solution is 1.2g/mL, and the molecular mass of MgBr2 is 184g/mol.