Chemistry help
posted by Cyn .
1) How do I calculate what the mass would be for the flask containing water and alkaseltzer if:
mass of flask and the 10ml of water equals 150.23g
mass of alkaselzer equals 0.65g
Calculate the mass of the carbon dioxide gas if:
mass of flask , water , and alkaseltzer remains at the end of the experiement equals 150.43g ( using the answer in #1)
Calculate the density of the carbon dioxide gas if:
 the volume of water added to the 250ml flask at the end of the experiement was 132.3ml

mass flask + H2O = 150.23
mass alkaseltzer = 0.65g
Total mass flask + H2O + alkaseltzer is
150.23 + 0.65 = ?