Sodium borohydride, NaBH a substance used in the synthesis...

Sodium borohydride, NaBH_ a substance used in the synthesis of many pharmaceutical agents, can be prepared by reaction of NaH with $\mathrm{B}_{2} \mathrm{H}_{6}$ according to the equation $2 \mathrm{NaH}+\mathrm{B}_{2} \mathrm{H}_{6} \rightarrow 2 \mathrm{NaBH}_{4}$ (a) How many grams of NaBH_ can be prepared by reaction between 8.55 $\mathrm{g}$ of NaH and 6.75 $\mathrm{g}$ of $\mathrm{B}_{2} \mathrm{H}_{6} ?$ (b) Which reactant is limiting, and how many grams of the excess reactant will be left over?

Sodium borohydride, NaBH_ a substance used in the synthesis of many pharmaceutical agents, can be prepared by reaction of NaH with $\mathrm{B}_{2} \mathrm{H}_{6}$ according to the equation $2 \mathrm{NaH}+\mathrm{B}_{2} \mathrm{H}_{6} \rightarrow 2 \mathrm{NaBH}_{4}$
(a) How many grams of NaBH_ can be prepared by reaction between 8.55 $\mathrm{g}$ of NaH and 6.75 $\mathrm{g}$ of $\mathrm{B}_{2} \mathrm{H}_{6} ?$
(b) Which reactant is limiting, and how many grams of the excess reactant will be left over?

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Key Concepts

Stoichiometry

Stoichiometry involves using the quantitative relationships provided by a balanced chemical equation to determine the amounts of reactants required or products formed in a chemical reaction. It uses mole-to-mole ratios to relate substances, enabling calculations of yields and conversions between mass and moles.

Limiting Reagent

The limiting reagent is the substance that is completely consumed first during a chemical reaction, thereby determining the maximum amount of product that can be formed. Identifying the limiting reagent is essential for predicting the reaction's yield and for calculating the amount of any excess reactant remaining.

Molar Mass

Molar mass is the mass of one mole of a substance, expressed in grams per mole. It serves as a conversion factor between the mass of a sample and the number of moles, which is a critical step in performing stoichiometric calculations in chemical reactions.

Theoretical Yield

The theoretical yield is the maximum amount of product that could be produced from given amounts of reactants, assuming complete conversion and no losses. It is derived from the stoichiometric calculations based on the limiting reagent and the balanced chemical equation.

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