EL_H = 1;
EL_C = 2;
EL_O = 3;
EL_Na = 4;
EL_Cl = 5;
EL_Ca = 6;
EL_Mg = 7;
EL_S = 8;
EL_P = 9;
EL_SO4 = 10;
EL_COUNT = 10;

# Elements
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

# Ions
M_SO4 = M_S+4*M_O; % g/mol

mol_masses = zeros(1, EL_COUNT);
mol_masses(EL_H) = M_H;
mol_masses(EL_C) = M_C;
mol_masses(EL_O) = M_O;
mol_masses(EL_Na) = M_Na;
mol_masses(EL_Cl) = M_Cl;
mol_masses(EL_Ca) = M_Ca;
mol_masses(EL_Mg) = M_Mg;
mol_masses(EL_S) = M_S;
mol_masses(EL_P) = M_P;
mol_masses(EL_SO4) = M_SO4;

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

# Create single elements [g/mol]
M_EL_Ca = create_mol([EL_Ca], [1], mol_masses);
M_EL_Mg  = create_mol([EL_Mg], [1], mol_masses);
M_EL_Na = create_mol([EL_Na], [1], mol_masses);
M_EL_Cl = create_mol([EL_Cl], [1], mol_masses);
M_EL_S = create_mol([EL_S], [1], mol_masses);

# Create single ions [g/mol]
M_EL_SO4 = create_mol([EL_SO4], [1], mol_masses);

# Create common used compounds [g/mol]
M_CaSO4 = create_mol([EL_Ca EL_SO4], [1 1], mol_masses);
M_CaCl2 = create_mol([EL_Ca EL_Cl], [1 2], mol_masses);
M_NaCl = create_mol([EL_Na EL_Cl], [1 1], mol_masses);
M_MgSO4  = create_mol([EL_Mg EL_SO4], [1 1], mol_masses);
M_NaHCO3 = create_mol([EL_Na EL_H EL_C EL_O], [1 1 1 3], mol_masses);
M_HCl = create_mol([EL_H EL_Cl], [1 1], mol_masses);
M_H2SO4 = create_mol([EL_H EL_SO4], [2 1], mol_masses);
M_H2O = create_mol([EL_H EL_O], [2 1], mol_masses);

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