a) Write the equilibrium constant equation for the following reaction. F e to the power of 3 plus end exponent subscript left parenthesis a q right parenthesis end subscript space plus space S C N to the power of minus subscript left parenthesis a q right parenthesis end subscript space left right double arrow space F e S C N to the power of 2 plus end exponent subscript left parenthesis a q right parenthesis end subscript b)