Theoretical yield of chemical reactions

Question

Aqueous hydrobromic acid (HBr)reacts with solid sodium hydroxide (NaOH) to produce aqueous sodium bromide (NaBr) and liquid water (H2O). What is the theoretical yield of sodium bromide formed from the reaction of 3.2g of hydrobromic acid and 2.4g of sodium hydroxide? Round your answer to 2 significant figures

Answer 1

The balanced equation is as follows:

HBr (aq) + NaOH (s) --> NaBr (aq) + H2O (aq)

Convert the mass quantities of the reactants into molar quantities:

3.2 g HBr/80.91 g/mol = 0.0396 mol HBr

2.4 g NaOH/40.00 g/mol = 0.06 mol NaOH

Because the coefficients in the reaction are all one and the molar quantity of HBr is less than that of NaOH, HBr is the limiting reagent, and thus 0.0396 mol NaBr is formed.

Obtain the mass of NaBr formed:

0.0396 mol * 102.894 g/mol = 4.1 g NaBr

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