Chemistry experiment

Question

A sample of 0.385 g of crushed Alka-Seltzer produced 0.122g of carbon dioxide. Calculate the mass of NaHCO3 from the amount of carbon dioxide generated in grams. Provide the answer with three significant figures.

Answer 1

With the help of Google I found that Alka-Seltzer contains citric acid as well as sodium bicarbonate and put together this reaction: C₆H₈O₇ + 3 NaHCO₃ --> Na₃C₆H₅O₇ + 3 CO₂ + 3 H₂O. Then

(0.122g CO₂) * (1 mole CO₂ / 44.01g CO₂) * (3 mole NaHCO₃ / 3 mole CO₂) * (83.00g NaHCO₃ / 1 mole NaHCO₃) = 0.230g NaHCO₃.