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2014-12-18T15:37:28+05:30

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It is not clear for which element C, H , O - we are asking the gram atoms.

   is the compound  (COOH)22 .  H2O  or      (COOH). 22 H2O ?

Let N be the Avogadro number.

for carbon

     in one mole of  (COOH)22  H2O  ,  we have 22 moles of carbon atoms.  In 0.3 moles of the compound,    we have  22 * 0.3 N atoms of carbon.  In 12 grams we have N atoms.  In 1 gm we have   N/12  number of atoms.

       Hence in 0.3 mole,  we have  6.6 N / (N/12)  = 79.2  gm atoms

for Hydrogen :
     There are 24 atoms in one molecule.
   Hence in 0.3 mole of compound,  (COOH)22 . H20,  we have
             0.3 * 24 N / (N/1)  = 7.2  gm atoms

for oxygen

     There are 45 atoms of oxgen in one mole. 
       Hence in 0.3 mole of (COOH)22  H2O  we have
               0.3 * 45  N / (N/16)  = 216  gram atoms.
===========================================
if the compound is  (COOH).  22 H2O

carbon -   
       0.3 * 1 N /(N/12)  = 3.6  gram atoms

oxygen
       0.3 * 24 N / (N/16) = 7.2*16  gram atoms

hydrogen
        0.3 * 45 N / (N/1) = 13.5 gram atoms





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