What is osmol? Relation between osmol and mole.

Osmole:

• It is the amount in gram of osmotically active substance which in 1 L solution with water exerts
• Smotic pressure equal to 22.4 almospherc (22.4 x 760 mmHg) and depresses the freezing point
  of water by 1.86 'C.
• Osmotically active substance means any substance which can exert osmotic pressure in solution
  with water.
• For highly osmotically active substances, (e.g. Na*, glucose etc'), relatively small amount of
  them represent 1 osmole compared to osmotically less active substances, (e'g. protein)'
• It is used as the unit of measurement for osmotically active substances'

 

Relation between Osmole and Mole:

What is Mole and What is equivalent? Relation Between them.

Mole

• It is the gram molecular weight of'a substance (if compound) or gram atomic weight of a
  substance (if element).
• Molecular weight or atomic weight of a substance expressed in gram.

Example:

• Atomic weight of calcium = 40; so one mole calcium = 40 I calcium'
• Molecular weight of HrSon = 98; so one mole H2So1= 98 I H2So4'
  Molecular weight of NacI = 58.5; so one mole Nacl = 58,5 g NaCl.
  Molecular weight of HrO = 18; so one mole HrO = 18 g HrO'

Equivalent:

• It is the gram equivalent weight of a substance
• Equivalent weight of a substance expressed in gram

Example:

• Equivalent weight of calcium = 20; so one equivalent calcium = 20 $ calcium'
• Equivalent weight of HrSOn = 49; so one equivalent H,SO, = 49 I H2SO4'

Relation Between Mole and Equivalent: