Chemistry lab help

Question

I'm working on a lab and I need someone to explain how to calculate some of the data. If you could give me an example for each one I don't understand I would appreciate it so I can work out the rest by myself. Here's my collected lab data:

Beaker #             vinegar/water  initial mass (g)  final mass (g)
            1             0 ml/35ml      120.000            122.318
            2             5 ml/30 ml     120.013            122.130
            3             10 ml/25 ml   120.027             122.143
            4             15 ml/20ml    120.040             122.157
            5             20 ml/15 ml   120.053             122.170
            6             25 ml/10 ml   120.067             122.183
            7             30 ml/ 5 ml    120.080             122.197
            8             35 ml/0 ml      120.093            122.210

I've already done part of the calculations but here's what I have and what I need help on.

The ones I need help on are blank

Beaker # Initial mass plus       Mass of CO2                     Moles of CO2       Mass of NaHCO3*:
                mass of AS (g):        evolved (g):                     (moles) (g):
1                 123
2                 123.012
3                 123.027
4                 123.040
5                 123.053
6                 123.067
7                 123.080
8                 123.093

* HCO3- + HCl ? H2O + CO2 + Cl-

Maximum mass of NaHCO3:

% NaHCO3 by mass:

*also side note the mass of AS(Alka-seltzer) is 3 g and the mass of an empty beaker is 85.000 if that helps

Answer 1

To determine the mass of CO2(g) lost simple carry out the following calculation:

 

mass CO2 = (mass AS) - (final mass)

 

at that point simply use stoichiometry to change to moles of CO2, which incidentally will also equal the number of moles of NaHCO3. Then, convert moles of NaHCO3 to mass of NaHCO3. Finally, determine percent NaHCO3 with this calculation:

 

% NaHCO3 = [(mass HCO3)/(mass AS)] x 100%