EXACTLY how much baking soda and vinegar will you need to FULLY fill a ziplock bag up with out popping it or under-flating it?

I am really confused. That is all our teacher told us and he said that we need to be prepared with a procedure for a lab tommorow. I know it deals with stokiometry but dont know where to go from there. We know we can find the volume of the bag by filling it with water and emptying the water into a beaker.

WHAT DO I DO NEXT? help greatly appreciated!

I know that i need to find the volume of the bag first, but all i need are some gas formulas and a procdure/instructions.

he gave us this formula...

CH3COOH + NaHCO3 --> CO2 +H2O + NaCH3COO

atomic masses:

CH3COOH - 60.05

NaHCO3 - 84.06

CO2 - 44.01

H2O - 18.02

NaCH3COO - 82.25

THANKS IN ADVANCED