Consider the reaction Mg, Si(s) + 4H2O(1) 2Mg(OH)2(aq) + SiH,(g) How many moles of excess reactant are left over if we start with 33.5 g of each reactant? a. O a. 0.11 mol O b. 1.75 mol c. none of these d. 1.42 mol e. 1.86 mol