Chapter 3, Problem 3.85SP

Sodium borohydride, ${\text{NaBH}}_4$ , a substance used in the synthesis of many pharmaceutical agents, can be prepared reaction of NaH with ${\text{B}}_{\text{2}}{\text{H}}_{\text{6}}$ according to the equation
$2\text{NaH}+{\text{B}}_{\text{2}}{\text{H}}_{\text{6}}\to 2{\text{NaBH}}_4$
(a) How many grams of ${\text{NaBH}}_4$ can be prepared by reaction between 8.55 g of Nail and 6.75 g of ${\text{B}}_{\text{2}}{\text{H}}_{\text{6}}$ ?
(b) Which reactant is limiting, and how many grams of the excess reactant will be left over?