CHEMISTRY 31

Quiz 1 - 10 minutes

Sept. 10, 2014

 

Name  _____________________                               Lab Section Number _____________

 

1.  A solution of phenol in water is prepared to be 0.72 mg/mL (mass solute/volume solution).

Calculate its concentration in mM (millimolar).  The formula weight of phenol is 94.1 g/mol.

 

[phenol] in mM = mmol/L (note: it is mmol/L because M = mol/L and mM = 1/1000th of M)

 

[phenol] in mM = (0.72 mg/mL)(1 mol/94.1 g)(1000 mmol/mol) = 7.7 mM