sodium borohydride,NaBH4, a substance used in the synthesisof many pharmaceutical agents,can be prepared by reaction of NaH with B2H6 according to the equation 2 NaH + B2H6 = 2 NaBH4. How many grams of NaBH4 can be prepared by reaction between 8.55 g of NaH and 6.75 g of B2H6? which reaction is limiting, and how many grams of the excess reactant will be left over?