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Grade 11Inorganic Chemistry

A sample of CaCO3 and MgCO3 weighing 192gm. is ignited to a constant weight of 104gm. What is the compoition of this mixture? Also, calculate the volume of CO2 evolved at STP.

Profile image of Shubhanjay Varma
10 Years agoGrade 11
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1 Answer

Profile image of Vikas TU
10 Years ago
CaCO3           ------------>         CaO           +        CO2
x/100 moles                          x/100 moles            x/100 moles    {initially}
 
MgCO3          ---------------->      MgO           +       CO2
(192-x)/84                           (192-x)/84              (192-x)/84            {initially}
 
 
CaCO3           ------------>         CaO           +        CO2
 y/100                                    y/100                    y/100              {finally}
 
   MgCO3          ---------------->      MgO           +       CO2             {finally}
  104-y/84                                104-y/84               104-y/84  
 
Now,            x/100  + (192-x)/84   =   104-y/84   +   y/100 …..............(1)
  x/100 moles  +  (192-x)/84 =    104-y/84 + y/100 …...............(2)

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