How many grams of a sodium bromide will be produced if 38.7 grams of sodium hydroxide was consumed in the reaction

Question

Reaction:

2NaOH(aq) + CaBr2(aq) ==> Ca(OH)2 + 2NaBr(aq)

Answer 1

2NaOH(aq) + CaBr₂(aq) ==> Ca(OH)₂ + 2NaBr(aq) ... balanced equation

Use the stoichiometry of the balanced equation along with dimensional analysis:

mols NaOH used = 38.7 g NaOH x 1 mol NaOH / 40 g = 0.9675 mols NaOH

mols NaBr produced = 0.9675 mols NaOH x 2 mols NaBr / 2 mol NaOH = 0.9675 mols NaBr

grams NaBr produced = 0.9675 mols NaBr x 103 g/mol NaBr = 99.7 g NaBr produced (3 sig. figs.)