Answer: 25 g.
Justification:
The law of conservation of mass states that the mass is conserved during a chemical reaction.
The disappearance of the tablet along with the formation of bubbles (fizzing) are a clear indication that a chemical reaction happened.
Since all the provisions were taken to prevent the escape of the products of the reaction (gaseous, liquids or solids), you can use the law of mass conservation to calculate the mass of the gas produced:
Law of mass conservation: mass of the rectants = mass of the products.
You can state it as: mass before the reaction = mass after the reaction.
Before reaction After reaction
tablet 25 g 0
bag 60 g 60 g
liquid 50 g 50 g
gas 0 x
total 135 g 110g + x
Equation:
