Complete the following calculations (use \"Need-to-Know Calculations\" for guida

Question

Complete the following calculations (use "Need-to-Know Calculations" for guidance). and report correct sig figs. a. During an experiment, 1.34-g of sodium bicarbonate were added to neutralize 0.75-mLs of concentrated hydrochloric acid (12 M). At the end of the experiment 0.434-g NaCl were isolated. Calculate the percent yield of sodium chloride. Given: HC1 + NaHCO_3 NaCl + H_2O + CO_2 b. 4-5^6-g of crude benzoic acid was purified by crystallization using water as the solvent. The isolated mass of the purified benzoic acid was 3.22-g. Calculate the percent recovery of benzoic acid.

Explanation / Answer

a. NaHCO3 = 1.34 g/84.01 g/mol = 0.016 mol

HCl = 12 M x 0.75 ml/1000 = 0.009 mol

Theoretical yield of NaCl = 0.009 mol x 58.44 g/mol = 0.525 g

Percent yield of NaCl = 0.434 x 100/0.525 = 82.67%

b. Percent recovery of benzoic acid = 3.22 x 100/4.56 = 70.61%

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