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Stoichiometric coefficient using matrix

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Ronald Aono
Ronald Aono on 25 Nov 2019
Answered: Jyothis Gireesh on 22 Jan 2020
%finding the appropriate stoichiometric coefficients for the folowing equation a1FeS + a2O2 = a3FeO + a4SO4
% Fe balance coefficients
Fe=[1 0 -1 0]; S = [1 0 0 -1]; O = [0 2 -1 -1]; b = [0; 0; 0; 0;];
A =[Fe;S;O];
X = A\b;
keep getting the same error code
Error using \
Matrix dimensions must agree.
Error in stoich_1 (line 6)
X = A\b;

  3 Comments

darova
darova on 25 Nov 2019
Matrix A is of 3x4 size. You only have 3 equations for 4 uknown variables
Ronald Aono
Ronald Aono on 27 Nov 2019
thanks for the earlier response
%finding the appropriate stoichiometric coefficients for the folowing equation a1FeS + a2O2 = a3FeO + a4SO4
% Fe balance coefficients
Fe=[1 0 -1 0]; S = [1 0 0 -1]; O = [0 2 -1 -1];
A =[Fe;S;O;]; b = [0 0 0 ];
X = A\b'
getting my vector X as zero vector which i know its wrong
stoich_1
X =
0
0
0
0
Matt J
Matt J on 28 Nov 2019
It is not wrong. X=zeros(4,1) is a valid solution.

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Answers (1)

Jyothis Gireesh
Jyothis Gireesh on 22 Jan 2020
Since the system of linear equations given above is of the form “Ax = 0”, the solution is given by the basis vectors of the null space of “A”. Any integral multiple of these basis vectors will also be a solution to the above system.
To determine the null space basis vectors, you may use the “null” function in MATLAB. In this case, the solution is given by
x = null(A);
which yields x = [0.5;0.5;0.5] as the result. All the other scaled versions of x will also be a solution.

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