A student uses 10.543 g of an NaHCO, (84.0 g/mol) solution to perform a gas stoichiometry experiment. The experiment yields 103.2 mL of displaced saturated NaCl (13.2 mmHg at 20C). The room temperature and pressure on the day were 20C and 756.2 mmHg. What was the % mass of the NaHCO, solution?

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