The method and the results are on the mole concept lab. Do the analysis yourself first, then check the answers below.
Quick answer: A mole is 6.022 × 10²³ particles, and its mass in grams is the molar mass M, so n = m/M links mass to amount. These answers go with the AP Chemistry lab on mole concept: the graph, the calculations, the uncertainties and the conclusion explained, for all 7 analysis questions.
Model answers use the sample results. Values follow from the balanced equation and the molar masses, so check that your own table gives answers in a similar range.
Spat solid counts as lost mass, so the mass lost looks bigger. The calculated NaHCO₃ would be too high.
Question 7 Improvement
Use a larger sample and repeat the experiment three times, or use a lid with a small hole so that no solid escapes. Averaging repeats reduces random error.
