The dissolution of copper sulfide in aqueous nitric acie is described by the fol

Question

The dissolution of copper sulfide in aqueous nitric acie is described by the following chemical equation: aCuS + bNO3 - +cH+ rightarrow dCu2+ + eSO 4 2- + fNO + gH2O where the coefficients a, b, c, d, e, f and g are the numbers of the various molecule participating in the reaction and are unknown. The unknown coefficients are determined by balancing each atom on left and right and then balancing the ionic charge. The resulting equations are: a=d, a=e, b=f, 3b=4e+f+g, c=2g, -b+c=2d-2e There are seven unknowns and only six equations. A solution can still be obtained, however, by taking advantage of the fact that all the coefficients must be positive Add a seventh equation by g

Explanation / Answer

index=0; a=0; b=ones(1,7); while(index~= 1) a=a+1; b(1)=a; b(2)=8*a/3; b(3)=8*a/3; b(6)=8*a/3; b(4)=a; b(5)=a; b(7)=4*a/3; index=positive(b,7); if(a>20) exit(1); end end for i=1:7 disp(b(i)) end ------------------------------------- here i have used a function positive.. code for this function:- function [a]=positive (b,i) a=0; for n=1:i if(rem(b(n),1)==0 && (a==0 || a==1)) a=1; else a=-1; end end ----------------------------------------- output:- 3 8 8 3 3 8 4

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