i_H = 1;
i_C = 2;
i_O = 3;
i_Na = 4;
i_Cl = 5;
i_Ca = 6;
i_Mg = 7;
i_S = 8;
i_P = 9;
N_mol = 9;

M_H  =  1.00794; % g/mol
M_C  = 12.0107;  % g/mol
M_O  = 15.9994;  % g/mol
M_Na = 22.9897;  % g/mol
M_Cl = 35.45;    % g/mol
M_Ca = 40.078;   % g/mol
M_Mg = 24.305;   % g/mol
M_S  = 32.06;    % g/mol
M_P  = 30.9738;  % g/mol

mol_masses = zeros(1, N_mol);
mol_masses(i_H) = M_H;
mol_masses(i_C) = M_C;
mol_masses(i_O) = M_O;
mol_masses(i_Na) = M_Na;
mol_masses(i_Cl) = M_Cl;
mol_masses(i_Ca) = M_Ca;
mol_masses(i_Mg) = M_Mg;
mol_masses(i_S) = M_S;
mol_masses(i_P) = M_P;

# Create single elements [g/mol]
M_EL_Ca = create_mol([i_Ca], [1], mol_masses);
M_EL_Mg  = create_mol([i_Mg], [1], mol_masses);
M_EL_Na = create_mol([i_Na], [1], mol_masses);
M_EL_Cl = create_mol([i_Cl], [1], mol_masses);
M_EL_S = create_mol([i_S], [1], mol_masses);

# Create common used compounds [g/mol]
M_CaSO4 = create_mol([i_Ca i_S i_O], [1 1 4], mol_masses);
M_CaCl2 = create_mol([i_Ca i_Cl], [1 2], mol_masses);
M_NaCl = create_mol([i_Na i_Cl], [1 1], mol_masses);
M_MgSO4  = create_mol([i_Mg i_S i_O], [1 1 4], mol_masses);
M_NaHCO3 = create_mol([i_Na i_H i_C i_O], [1 1 1 3], mol_masses);
M_HCl = create_mol([i_H i_Cl], [1 1], mol_masses);
M_H2SO4 = create_mol([i_H i_S i_O], [2 1 4], mol_masses);
M_H2O = create_mol([i_H i_O], [2 1], mol_masses);

function mol = create_mol(indices, n, mol_masses)
  N = length(mol_masses);
  mol = zeros(1, N);
  mol(indices) = n.*mol_masses(indices);
endfunction

function mol = create_vec(indices, quantity, N)
  mol = zeros(1, N);
  mol(indices) = quantity;
endfunction